"
Team:TU-Munich/Flot.js
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ChristopherW (Talk | contribs) (Created page with "- →Javascript plotting library for jQuery, version 0.8.2-alpha. Copyright (c) 2007-2013 IOLA and Ole Laursen. Licensed under the MIT license.: // first an inline dependency,...") |
ChristopherW (Talk | contribs) (Undo revision 325393 by ChristopherW (talk)) |
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Latest revision as of 11:59, 23 October 2013
/* Javascript plotting library for jQuery, version 0.8.2-alpha.
Copyright (c) 2007-2013 IOLA and Ole Laursen. Licensed under the MIT license.
- /
// first an inline dependency, jquery.colorhelpers.js, we inline it here // for convenience
/* Plugin for jQuery for working with colors.
*
* Version 1.1.
*
* Inspiration from jQuery color animation plugin by John Resig.
*
* Released under the MIT license by Ole Laursen, October 2009.
*
* Examples:
*
* $.color.parse("#fff").scale('rgb', 0.25).add('a', -0.5).toString()
* var c = $.color.extract($("#mydiv"), 'background-color');
* console.log(c.r, c.g, c.b, c.a);
* $.color.make(100, 50, 25, 0.4).toString() // returns "rgba(100,50,25,0.4)"
*
* Note that .scale() and .add() return the same modified object
* instead of making a new one.
*
* V. 1.1: Fix error handling so e.g. parsing an empty string does
* produce a color rather than just crashing.
*/
(function(B){B.color={};B.color.make=function(F,E,C,D){var G={};G.r=F||0;G.g=E||0;G.b=C||0;G.a=D!=null?D:1;G.add=function(J,I){for(var H=0;H<J.length;++H){G[J.charAt(H)]+=I}return G.normalize()};G.scale=function(J,I){for(var H=0;H<J.length;++H){G[J.charAt(H)]*=I}return G.normalize()};G.toString=function(){if(G.a>=1){return"rgb("+[G.r,G.g,G.b].join(",")+")"}else{return"rgba("+[G.r,G.g,G.b,G.a].join(",")+")"}};G.normalize=function(){function H(J,K,I){return K<J?J:(K>I?I:K)}G.r=H(0,parseInt(G.r),255);G.g=H(0,parseInt(G.g),255);G.b=H(0,parseInt(G.b),255);G.a=H(0,G.a,1);return G};G.clone=function(){return B.color.make(G.r,G.b,G.g,G.a)};return G.normalize()};B.color.extract=function(D,C){var E;do{E=D.css(C).toLowerCase();if(E!=""&&E!="transparent"){break}D=D.parent()}while(!B.nodeName(D.get(0),"body"));if(E=="rgba(0, 0, 0, 0)"){E="transparent"}return B.color.parse(E)};B.color.parse=function(F){var E,C=B.color.make;if(E=/rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(F)){return C(parseInt(E[1],10),parseInt(E[2],10),parseInt(E[3],10))}if(E=/rgba\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*\)/.exec(F)){return C(parseInt(E[1],10),parseInt(E[2],10),parseInt(E[3],10),parseFloat(E[4]))}if(E=/rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(F)){return C(parseFloat(E[1])*2.55,parseFloat(E[2])*2.55,parseFloat(E[3])*2.55)}if(E=/rgba\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\s*\)/.exec(F)){return C(parseFloat(E[1])*2.55,parseFloat(E[2])*2.55,parseFloat(E[3])*2.55,parseFloat(E[4]))}if(E=/#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(F)){return C(parseInt(E[1],16),parseInt(E[2],16),parseInt(E[3],16))}if(E=/#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(F)){return C(parseInt(E[1]+E[1],16),parseInt(E[2]+E[2],16),parseInt(E[3]+E[3],16))}var D=B.trim(F).toLowerCase();if(D=="transparent"){return C(255,255,255,0)}else{E=A[D]||[0,0,0];return C(E[0],E[1],E[2])}};var A={aqua:[0,255,255],azure:[240,255,255],beige:[245,245,220],black:[0,0,0],blue:[0,0,255],brown:[165,42,42],cyan:[0,255,255],darkblue:[0,0,139],darkcyan:[0,139,139],darkgrey:[169,169,169],darkgreen:[0,100,0],darkkhaki:[189,183,107],darkmagenta:[139,0,139],darkolivegreen:[85,107,47],darkorange:[255,140,0],darkorchid:[153,50,204],darkred:[139,0,0],darksalmon:[233,150,122],darkviolet:[148,0,211],fuchsia:[255,0,255],gold:[255,215,0],green:[0,128,0],indigo:[75,0,130],khaki:[240,230,140],lightblue:[173,216,230],lightcyan:[224,255,255],lightgreen:[144,238,144],lightgrey:[211,211,211],lightpink:[255,182,193],lightyellow:[255,255,224],lime:[0,255,0],magenta:[255,0,255],maroon:[128,0,0],navy:[0,0,128],olive:[128,128,0],orange:[255,165,0],pink:[255,192,203],purple:[128,0,128],violet:[128,0,128],red:[255,0,0],silver:[192,192,192],white:[255,255,255],yellow:[255,255,0]}})(jQuery);
// the actual Flot code (function($) {
// Cache the prototype hasOwnProperty for faster access
var hasOwnProperty = Object.prototype.hasOwnProperty;
/////////////////////////////////////////////////////////////////////////// // The Canvas object is a wrapper around an HTML5 <canvas> tag. // // @constructor // @param {string} cls List of classes to apply to the canvas. // @param {element} container Element onto which to append the canvas. // // Requiring a container is a little iffy, but unfortunately canvas // operations don't work unless the canvas is attached to the DOM.
function Canvas(cls, container) {
var element = container.children("." + cls)[0];
if (element == null) {
element = document.createElement("canvas"); element.className = cls;
$(element).css({ direction: "ltr", position: "absolute", left: 0, top: 0 }) .appendTo(container);
// If HTML5 Canvas isn't available, fall back to [Ex|Flash]canvas
if (!element.getContext) { if (window.G_vmlCanvasManager) { element = window.G_vmlCanvasManager.initElement(element); } else { throw new Error("Canvas is not available. If you're using IE with a fall-back such as Excanvas, then there's either a mistake in your conditional include, or the page has no DOCTYPE and is rendering in Quirks Mode."); } } }
this.element = element;
var context = this.context = element.getContext("2d");
// Determine the screen's ratio of physical to device-independent // pixels. This is the ratio between the canvas width that the browser // advertises and the number of pixels actually present in that space.
// The iPhone 4, for example, has a device-independent width of 320px, // but its screen is actually 640px wide. It therefore has a pixel // ratio of 2, while most normal devices have a ratio of 1.
var devicePixelRatio = window.devicePixelRatio || 1, backingStoreRatio = context.webkitBackingStorePixelRatio || context.mozBackingStorePixelRatio || context.msBackingStorePixelRatio || context.oBackingStorePixelRatio || context.backingStorePixelRatio || 1;
this.pixelRatio = devicePixelRatio / backingStoreRatio;
// Size the canvas to match the internal dimensions of its container
this.resize(container.width(), container.height());
// Collection of HTML div layers for text overlaid onto the canvas
this.textContainer = null; this.text = {};
// Cache of text fragments and metrics, so we can avoid expensively // re-calculating them when the plot is re-rendered in a loop.
this._textCache = {}; }
// Resizes the canvas to the given dimensions. // // @param {number} width New width of the canvas, in pixels. // @param {number} width New height of the canvas, in pixels.
Canvas.prototype.resize = function(width, height) {
if (width <= 0 || height <= 0) { throw new Error("Invalid dimensions for plot, width = " + width + ", height = " + height); }
var element = this.element, context = this.context, pixelRatio = this.pixelRatio;
// Resize the canvas, increasing its density based on the display's // pixel ratio; basically giving it more pixels without increasing the // size of its element, to take advantage of the fact that retina // displays have that many more pixels in the same advertised space.
// Resizing should reset the state (excanvas seems to be buggy though)
if (this.width != width) { element.width = width * pixelRatio; element.style.width = width + "px"; this.width = width; }
if (this.height != height) { element.height = height * pixelRatio; element.style.height = height + "px"; this.height = height; }
// Save the context, so we can reset in case we get replotted. The // restore ensure that we're really back at the initial state, and // should be safe even if we haven't saved the initial state yet.
context.restore(); context.save();
// Scale the coordinate space to match the display density; so even though we // may have twice as many pixels, we still want lines and other drawing to // appear at the same size; the extra pixels will just make them crisper.
context.scale(pixelRatio, pixelRatio); };
// Clears the entire canvas area, not including any overlaid HTML text
Canvas.prototype.clear = function() { this.context.clearRect(0, 0, this.width, this.height); };
// Finishes rendering the canvas, including managing the text overlay.
Canvas.prototype.render = function() {
var cache = this._textCache;
// For each text layer, add elements marked as active that haven't // already been rendered, and remove those that are no longer active.
for (var layerKey in cache) { if (hasOwnProperty.call(cache, layerKey)) {
var layer = this.getTextLayer(layerKey), layerCache = cache[layerKey];
layer.hide();
for (var styleKey in layerCache) { if (hasOwnProperty.call(layerCache, styleKey)) { var styleCache = layerCache[styleKey]; for (var key in styleCache) { if (hasOwnProperty.call(styleCache, key)) {
var positions = styleCache[key].positions;
for (var i = 0, position; position = positions[i]; i++) { if (position.active) { if (!position.rendered) { layer.append(position.element); position.rendered = true; } } else { positions.splice(i--, 1); if (position.rendered) { position.element.detach(); } } }
if (positions.length == 0) { delete styleCache[key]; } } } } }
layer.show(); } } };
// Creates (if necessary) and returns the text overlay container. // // @param {string} classes String of space-separated CSS classes used to // uniquely identify the text layer. // @return {object} The jQuery-wrapped text-layer div.
Canvas.prototype.getTextLayer = function(classes) {
var layer = this.text[classes];
// Create the text layer if it doesn't exist
if (layer == null) {
// Create the text layer container, if it doesn't exist
if (this.textContainer == null) {
this.textContainer = $("").css({ position: "absolute", top: 0, left: 0, bottom: 0, right: 0, 'font-size': "smaller", color: "#545454" }) .insertAfter(this.element); }
layer = this.text[classes] = $("").addClass(classes) .css({ position: "absolute", top: 0, left: 0, bottom: 0, right: 0 }) .appendTo(this.textContainer); }
return layer; };
// Creates (if necessary) and returns a text info object. // // The object looks like this: // // { // width: Width of the text's wrapper div. // height: Height of the text's wrapper div. // element: The jQuery-wrapped HTML div containing the text. // positions: Array of positions at which this text is drawn. // } // // The positions array contains objects that look like this: // // { // active: Flag indicating whether the text should be visible. // rendered: Flag indicating whether the text is currently visible. // element: The jQuery-wrapped HTML div containing the text. // x: X coordinate at which to draw the text. // y: Y coordinate at which to draw the text. // } // // Each position after the first receives a clone of the original element. // // The idea is that that the width, height, and general 'identity' of the // text is constant no matter where it is placed; the placements are a // secondary property. // // Canvas maintains a cache of recently-used text info objects; getTextInfo // either returns the cached element or creates a new entry. // // @param {string} layer A string of space-separated CSS classes uniquely // identifying the layer containing this text. // @param {string} text Text string to retrieve info for. // @param {(string|object)=} font Either a string of space-separated CSS // classes or a font-spec object, defining the text's font and style. // @param {number=} angle Angle at which to rotate the text, in degrees. // Angle is currently unused, it will be implemented in the future. // @param {number=} width Maximum width of the text before it wraps. // @return {object} a text info object.
Canvas.prototype.getTextInfo = function(layer, text, font, angle, width) {
var textStyle, layerCache, styleCache, info;
// Cast the value to a string, in case we were given a number or such
text = "" + text;
// If the font is a font-spec object, generate a CSS font definition
if (typeof font === "object") { textStyle = font.style + " " + font.variant + " " + font.weight + " " + font.size + "px/" + font.lineHeight + "px " + font.family; } else { textStyle = font; }
// Retrieve (or create) the cache for the text's layer and styles
layerCache = this._textCache[layer];
if (layerCache == null) { layerCache = this._textCache[layer] = {}; }
styleCache = layerCache[textStyle];
if (styleCache == null) { styleCache = layerCache[textStyle] = {}; }
info = styleCache[text];
// If we can't find a matching element in our cache, create a new one
if (info == null) {
var element = $("").html(text).css({ position: "absolute", 'max-width': width, top: -9999 }) .appendTo(this.getTextLayer(layer));
if (typeof font === "object") { element.css({ font: textStyle, color: font.color }); } else if (typeof font === "string") { element.addClass(font); }
info = styleCache[text] = { width: element.outerWidth(true), height: element.outerHeight(true), element: element, positions: [] };
element.detach(); }
return info; };
// Adds a text string to the canvas text overlay. // // The text isn't drawn immediately; it is marked as rendering, which will // result in its addition to the canvas on the next render pass. // // @param {string} layer A string of space-separated CSS classes uniquely // identifying the layer containing this text. // @param {number} x X coordinate at which to draw the text. // @param {number} y Y coordinate at which to draw the text. // @param {string} text Text string to draw. // @param {(string|object)=} font Either a string of space-separated CSS // classes or a font-spec object, defining the text's font and style. // @param {number=} angle Angle at which to rotate the text, in degrees. // Angle is currently unused, it will be implemented in the future. // @param {number=} width Maximum width of the text before it wraps. // @param {string=} halign Horizontal alignment of the text; either "left", // "center" or "right". // @param {string=} valign Vertical alignment of the text; either "top", // "middle" or "bottom".
Canvas.prototype.addText = function(layer, x, y, text, font, angle, width, halign, valign) {
var info = this.getTextInfo(layer, text, font, angle, width), positions = info.positions;
// Tweak the div's position to match the text's alignment
if (halign == "center") { x -= info.width / 2; } else if (halign == "right") { x -= info.width; }
if (valign == "middle") { y -= info.height / 2; } else if (valign == "bottom") { y -= info.height; }
// Determine whether this text already exists at this position. // If so, mark it for inclusion in the next render pass.
for (var i = 0, position; position = positions[i]; i++) { if (position.x == x && position.y == y) { position.active = true; return; } }
// If the text doesn't exist at this position, create a new entry
// For the very first position we'll re-use the original element, // while for subsequent ones we'll clone it.
position = { active: true, rendered: false, element: positions.length ? info.element.clone() : info.element, x: x, y: y };
positions.push(position);
// Move the element to its final position within the container
position.element.css({ top: Math.round(y), left: Math.round(x), 'text-align': halign // In case the text wraps }); };
// Removes one or more text strings from the canvas text overlay. // // If no parameters are given, all text within the layer is removed. // // Note that the text is not immediately removed; it is simply marked as // inactive, which will result in its removal on the next render pass. // This avoids the performance penalty for 'clear and redraw' behavior, // where we potentially get rid of all text on a layer, but will likely // add back most or all of it later, as when redrawing axes, for example. // // @param {string} layer A string of space-separated CSS classes uniquely // identifying the layer containing this text. // @param {number=} x X coordinate of the text. // @param {number=} y Y coordinate of the text. // @param {string=} text Text string to remove. // @param {(string|object)=} font Either a string of space-separated CSS // classes or a font-spec object, defining the text's font and style. // @param {number=} angle Angle at which the text is rotated, in degrees. // Angle is currently unused, it will be implemented in the future.
Canvas.prototype.removeText = function(layer, x, y, text, font, angle) { if (text == null) { var layerCache = this._textCache[layer]; if (layerCache != null) { for (var styleKey in layerCache) { if (hasOwnProperty.call(layerCache, styleKey)) { var styleCache = layerCache[styleKey]; for (var key in styleCache) { if (hasOwnProperty.call(styleCache, key)) { var positions = styleCache[key].positions; for (var i = 0, position; position = positions[i]; i++) { position.active = false; } } } } } } } else { var positions = this.getTextInfo(layer, text, font, angle).positions; for (var i = 0, position; position = positions[i]; i++) { if (position.x == x && position.y == y) { position.active = false; } } } };
/////////////////////////////////////////////////////////////////////////// // The top-level container for the entire plot.
function Plot(placeholder, data_, options_, plugins) {
// data is on the form:
// [ series1, series2 ... ]
// where series is either just the data as [ [x1, y1], [x2, y2], ... ]
// or { data: [ [x1, y1], [x2, y2], ... ], label: "some label", ... }
var series = [],
options = {
// the color theme used for graphs
colors: ["#edc240", "#afd8f8", "#cb4b4b", "#4da74d", "#9440ed"],
legend: {
show: true,
noColumns: 1, // number of colums in legend table
labelFormatter: null, // fn: string -> string
labelBoxBorderColor: "#ccc", // border color for the little label boxes
container: null, // container (as jQuery object) to put legend in, null means default on top of graph
position: "ne", // position of default legend container within plot
margin: 5, // distance from grid edge to default legend container within plot
backgroundColor: null, // null means auto-detect
backgroundOpacity: 0.85, // set to 0 to avoid background
sorted: null // default to no legend sorting
},
xaxis: {
show: null, // null = auto-detect, true = always, false = never
position: "bottom", // or "top"
mode: null, // null or "time"
font: null, // null (derived from CSS in placeholder) or object like { size: 11, lineHeight: 13, style: "italic", weight: "bold", family: "sans-serif", variant: "small-caps" }
color: null, // base color, labels, ticks
tickColor: null, // possibly different color of ticks, e.g. "rgba(0,0,0,0.15)"
transform: null, // null or f: number -> number to transform axis
inverseTransform: null, // if transform is set, this should be the inverse function
min: null, // min. value to show, null means set automatically
max: null, // max. value to show, null means set automatically
autoscaleMargin: null, // margin in % to add if auto-setting min/max
ticks: null, // either [1, 3] or [[1, "a"], 3] or (fn: axis info -> ticks) or app. number of ticks for auto-ticks
tickFormatter: null, // fn: number -> string
labelWidth: null, // size of tick labels in pixels
labelHeight: null,
reserveSpace: null, // whether to reserve space even if axis isn't shown
tickLength: null, // size in pixels of ticks, or "full" for whole line
alignTicksWithAxis: null, // axis number or null for no sync
tickDecimals: null, // no. of decimals, null means auto
tickSize: null, // number or [number, "unit"]
minTickSize: null // number or [number, "unit"]
},
yaxis: {
autoscaleMargin: 0.02,
position: "left" // or "right"
},
xaxes: [],
yaxes: [],
series: {
points: {
show: false,
radius: 3,
lineWidth: 2, // in pixels
fill: true,
fillColor: "#ffffff",
symbol: "circle" // or callback
},
lines: {
// we don't put in show: false so we can see
// whether lines were actively disabled
lineWidth: 2, // in pixels
fill: false,
fillColor: null,
steps: false
// Omit 'zero', so we can later default its value to
// match that of the 'fill' option.
},
bars: {
show: false,
lineWidth: 2, // in pixels
barWidth: 1, // in units of the x axis
fill: true,
fillColor: null,
align: "left", // "left", "right", or "center"
horizontal: false,
zero: true
},
shadowSize: 3,
highlightColor: null
},
grid: {
show: true,
aboveData: false,
color: "#545454", // primary color used for outline and labels
backgroundColor: null, // null for transparent, else color
borderColor: null, // set if different from the grid color
tickColor: null, // color for the ticks, e.g. "rgba(0,0,0,0.15)"
margin: 0, // distance from the canvas edge to the grid
labelMargin: 5, // in pixels
axisMargin: 8, // in pixels
borderWidth: 2, // in pixels
minBorderMargin: null, // in pixels, null means taken from points radius
markings: null, // array of ranges or fn: axes -> array of ranges
markingsColor: "#f4f4f4",
markingsLineWidth: 2,
// interactive stuff
clickable: false,
hoverable: false,
autoHighlight: true, // highlight in case mouse is near
mouseActiveRadius: 10 // how far the mouse can be away to activate an item
},
interaction: {
redrawOverlayInterval: 1000/60 // time between updates, -1 means in same flow
},
hooks: {}
},
surface = null, // the canvas for the plot itself
overlay = null, // canvas for interactive stuff on top of plot
eventHolder = null, // jQuery object that events should be bound to
ctx = null, octx = null,
xaxes = [], yaxes = [],
plotOffset = { left: 0, right: 0, top: 0, bottom: 0},
plotWidth = 0, plotHeight = 0,
hooks = {
processOptions: [],
processRawData: [],
processDatapoints: [],
processOffset: [],
drawBackground: [],
drawSeries: [],
draw: [],
bindEvents: [],
drawOverlay: [],
shutdown: []
},
plot = this;
// public functions
plot.setData = setData;
plot.setupGrid = setupGrid;
plot.draw = draw;
plot.getPlaceholder = function() { return placeholder; };
plot.getCanvas = function() { return surface.element; };
plot.getPlotOffset = function() { return plotOffset; };
plot.width = function () { return plotWidth; };
plot.height = function () { return plotHeight; };
plot.offset = function () {
var o = eventHolder.offset();
o.left += plotOffset.left;
o.top += plotOffset.top;
return o;
};
plot.getData = function () { return series; };
plot.getAxes = function () {
var res = {}, i;
$.each(xaxes.concat(yaxes), function (_, axis) {
if (axis)
res[axis.direction + (axis.n != 1 ? axis.n : "") + "axis"] = axis;
});
return res;
};
plot.getXAxes = function () { return xaxes; };
plot.getYAxes = function () { return yaxes; };
plot.c2p = canvasToAxisCoords;
plot.p2c = axisToCanvasCoords;
plot.getOptions = function () { return options; };
plot.highlight = highlight;
plot.unhighlight = unhighlight;
plot.triggerRedrawOverlay = triggerRedrawOverlay;
plot.pointOffset = function(point) {
return {
left: parseInt(xaxes[axisNumber(point, "x") - 1].p2c(+point.x) + plotOffset.left, 10),
top: parseInt(yaxes[axisNumber(point, "y") - 1].p2c(+point.y) + plotOffset.top, 10)
};
};
plot.shutdown = shutdown;
plot.resize = function () {
var width = placeholder.width(),
height = placeholder.height();
surface.resize(width, height);
overlay.resize(width, height);
};
// public attributes
plot.hooks = hooks;
// initialize
initPlugins(plot);
parseOptions(options_);
setupCanvases();
setData(data_);
setupGrid();
draw();
bindEvents();
function executeHooks(hook, args) {
args = [plot].concat(args);
for (var i = 0; i < hook.length; ++i)
hook[i].apply(this, args);
}
function initPlugins() {
// References to key classes, allowing plugins to modify them
var classes = {
Canvas: Canvas
};
for (var i = 0; i < plugins.length; ++i) {
var p = plugins[i];
p.init(plot, classes);
if (p.options)
$.extend(true, options, p.options);
}
}
function parseOptions(opts) {
$.extend(true, options, opts);
// $.extend merges arrays, rather than replacing them. When less
// colors are provided than the size of the default palette, we
// end up with those colors plus the remaining defaults, which is
// not expected behavior; avoid it by replacing them here.
if (opts && opts.colors) {
options.colors = opts.colors;
}
if (options.xaxis.color == null)
options.xaxis.color = $.color.parse(options.grid.color).scale('a', 0.22).toString();
if (options.yaxis.color == null)
options.yaxis.color = $.color.parse(options.grid.color).scale('a', 0.22).toString();
if (options.xaxis.tickColor == null) // grid.tickColor for back-compatibility
options.xaxis.tickColor = options.grid.tickColor || options.xaxis.color;
if (options.yaxis.tickColor == null) // grid.tickColor for back-compatibility
options.yaxis.tickColor = options.grid.tickColor || options.yaxis.color;
if (options.grid.borderColor == null)
options.grid.borderColor = options.grid.color;
if (options.grid.tickColor == null)
options.grid.tickColor = $.color.parse(options.grid.color).scale('a', 0.22).toString();
// Fill in defaults for axis options, including any unspecified
// font-spec fields, if a font-spec was provided.
// If no x/y axis options were provided, create one of each anyway,
// since the rest of the code assumes that they exist.
var i, axisOptions, axisCount,
fontDefaults = {
style: placeholder.css("font-style"),
size: Math.round(0.8 * (+placeholder.css("font-size").replace("px", "") || 13)),
variant: placeholder.css("font-variant"),
weight: placeholder.css("font-weight"),
family: placeholder.css("font-family")
};
fontDefaults.lineHeight = fontDefaults.size * 1.15;
axisCount = options.xaxes.length || 1;
for (i = 0; i < axisCount; ++i) {
axisOptions = options.xaxes[i];
if (axisOptions && !axisOptions.tickColor) {
axisOptions.tickColor = axisOptions.color;
}
axisOptions = $.extend(true, {}, options.xaxis, axisOptions);
options.xaxes[i] = axisOptions;
if (axisOptions.font) {
axisOptions.font = $.extend({}, fontDefaults, axisOptions.font);
if (!axisOptions.font.color) {
axisOptions.font.color = axisOptions.color;
}
}
}
axisCount = options.yaxes.length || 1;
for (i = 0; i < axisCount; ++i) {
axisOptions = options.yaxes[i];
if (axisOptions && !axisOptions.tickColor) {
axisOptions.tickColor = axisOptions.color;
}
axisOptions = $.extend(true, {}, options.yaxis, axisOptions);
options.yaxes[i] = axisOptions;
if (axisOptions.font) {
axisOptions.font = $.extend({}, fontDefaults, axisOptions.font);
if (!axisOptions.font.color) {
axisOptions.font.color = axisOptions.color;
}
}
}
// backwards compatibility, to be removed in future
if (options.xaxis.noTicks && options.xaxis.ticks == null)
options.xaxis.ticks = options.xaxis.noTicks;
if (options.yaxis.noTicks && options.yaxis.ticks == null)
options.yaxis.ticks = options.yaxis.noTicks;
if (options.x2axis) {
options.xaxes[1] = $.extend(true, {}, options.xaxis, options.x2axis);
options.xaxes[1].position = "top";
}
if (options.y2axis) {
options.yaxes[1] = $.extend(true, {}, options.yaxis, options.y2axis);
options.yaxes[1].position = "right";
}
if (options.grid.coloredAreas)
options.grid.markings = options.grid.coloredAreas;
if (options.grid.coloredAreasColor)
options.grid.markingsColor = options.grid.coloredAreasColor;
if (options.lines)
$.extend(true, options.series.lines, options.lines);
if (options.points)
$.extend(true, options.series.points, options.points);
if (options.bars)
$.extend(true, options.series.bars, options.bars);
if (options.shadowSize != null)
options.series.shadowSize = options.shadowSize;
if (options.highlightColor != null)
options.series.highlightColor = options.highlightColor;
// save options on axes for future reference
for (i = 0; i < options.xaxes.length; ++i)
getOrCreateAxis(xaxes, i + 1).options = options.xaxes[i];
for (i = 0; i < options.yaxes.length; ++i)
getOrCreateAxis(yaxes, i + 1).options = options.yaxes[i];
// add hooks from options
for (var n in hooks)
if (options.hooks[n] && options.hooks[n].length)
hooks[n] = hooks[n].concat(options.hooks[n]);
executeHooks(hooks.processOptions, [options]);
}
function setData(d) {
series = parseData(d);
fillInSeriesOptions();
processData();
}
function parseData(d) {
var res = [];
for (var i = 0; i < d.length; ++i) {
var s = $.extend(true, {}, options.series);
if (d[i].data != null) {
s.data = d[i].data; // move the data instead of deep-copy
delete d[i].data;
$.extend(true, s, d[i]);
d[i].data = s.data;
}
else
s.data = d[i];
res.push(s);
}
return res;
}
function axisNumber(obj, coord) {
var a = obj[coord + "axis"];
if (typeof a == "object") // if we got a real axis, extract number
a = a.n;
if (typeof a != "number")
a = 1; // default to first axis
return a;
}
function allAxes() {
// return flat array without annoying null entries
return $.grep(xaxes.concat(yaxes), function (a) { return a; });
}
function canvasToAxisCoords(pos) {
// return an object with x/y corresponding to all used axes
var res = {}, i, axis;
for (i = 0; i < xaxes.length; ++i) {
axis = xaxes[i];
if (axis && axis.used)
res["x" + axis.n] = axis.c2p(pos.left);
}
for (i = 0; i < yaxes.length; ++i) {
axis = yaxes[i];
if (axis && axis.used)
res["y" + axis.n] = axis.c2p(pos.top);
}
if (res.x1 !== undefined)
res.x = res.x1;
if (res.y1 !== undefined)
res.y = res.y1;
return res;
}
function axisToCanvasCoords(pos) {
// get canvas coords from the first pair of x/y found in pos
var res = {}, i, axis, key;
for (i = 0; i < xaxes.length; ++i) {
axis = xaxes[i];
if (axis && axis.used) {
key = "x" + axis.n;
if (pos[key] == null && axis.n == 1)
key = "x";
if (pos[key] != null) {
res.left = axis.p2c(pos[key]);
break;
}
}
}
for (i = 0; i < yaxes.length; ++i) {
axis = yaxes[i];
if (axis && axis.used) {
key = "y" + axis.n;
if (pos[key] == null && axis.n == 1)
key = "y";
if (pos[key] != null) {
res.top = axis.p2c(pos[key]);
break;
}
}
}
return res;
}
function getOrCreateAxis(axes, number) {
if (!axes[number - 1])
axes[number - 1] = {
n: number, // save the number for future reference
direction: axes == xaxes ? "x" : "y",
options: $.extend(true, {}, axes == xaxes ? options.xaxis : options.yaxis)
};
return axes[number - 1];
}
function fillInSeriesOptions() {
var neededColors = series.length, maxIndex = -1, i;
// Subtract the number of series that already have fixed colors or
// color indexes from the number that we still need to generate.
for (i = 0; i < series.length; ++i) {
var sc = series[i].color;
if (sc != null) {
neededColors--;
if (typeof sc == "number" && sc > maxIndex) {
maxIndex = sc;
}
}
}
// If any of the series have fixed color indexes, then we need to
// generate at least as many colors as the highest index.
if (neededColors <= maxIndex) {
neededColors = maxIndex + 1;
}
// Generate all the colors, using first the option colors and then
// variations on those colors once they're exhausted.
var c, colors = [], colorPool = options.colors,
colorPoolSize = colorPool.length, variation = 0;
for (i = 0; i < neededColors; i++) {
c = $.color.parse(colorPool[i % colorPoolSize] || "#666");
// Each time we exhaust the colors in the pool we adjust
// a scaling factor used to produce more variations on
// those colors. The factor alternates negative/positive
// to produce lighter/darker colors.
// Reset the variation after every few cycles, or else
// it will end up producing only white or black colors.
if (i % colorPoolSize == 0 && i) {
if (variation >= 0) {
if (variation < 0.5) {
variation = -variation - 0.2;
} else variation = 0;
} else variation = -variation;
}
colors[i] = c.scale('rgb', 1 + variation);
}
// Finalize the series options, filling in their colors
var colori = 0, s;
for (i = 0; i < series.length; ++i) {
s = series[i];
// assign colors
if (s.color == null) {
s.color = colors[colori].toString();
++colori;
}
else if (typeof s.color == "number")
s.color = colors[s.color].toString();
// turn on lines automatically in case nothing is set
if (s.lines.show == null) {
var v, show = true;
for (v in s)
if (s[v] && s[v].show) {
show = false;
break;
}
if (show)
s.lines.show = true;
}
// If nothing was provided for lines.zero, default it to match
// lines.fill, since areas by default should extend to zero.
if (s.lines.zero == null) {
s.lines.zero = !!s.lines.fill;
}
// setup axes
s.xaxis = getOrCreateAxis(xaxes, axisNumber(s, "x"));
s.yaxis = getOrCreateAxis(yaxes, axisNumber(s, "y"));
}
}
function processData() {
var topSentry = Number.POSITIVE_INFINITY,
bottomSentry = Number.NEGATIVE_INFINITY,
fakeInfinity = Number.MAX_VALUE,
i, j, k, m, length,
s, points, ps, x, y, axis, val, f, p,
data, format;
function updateAxis(axis, min, max) {
if (min < axis.datamin && min != -fakeInfinity)
axis.datamin = min;
if (max > axis.datamax && max != fakeInfinity)
axis.datamax = max;
}
$.each(allAxes(), function (_, axis) {
// init axis
axis.datamin = topSentry;
axis.datamax = bottomSentry;
axis.used = false;
});
for (i = 0; i < series.length; ++i) {
s = series[i];
s.datapoints = { points: [] };
executeHooks(hooks.processRawData, [ s, s.data, s.datapoints ]);
}
// first pass: clean and copy data
for (i = 0; i < series.length; ++i) {
s = series[i];
data = s.data;
format = s.datapoints.format;
if (!format) {
format = [];
// find out how to copy
format.push({ x: true, number: true, required: true });
format.push({ y: true, number: true, required: true });
if (s.bars.show || (s.lines.show && s.lines.fill)) {
var autoscale = !!((s.bars.show && s.bars.zero) || (s.lines.show && s.lines.zero));
format.push({ y: true, number: true, required: false, defaultValue: 0, autoscale: autoscale });
if (s.bars.horizontal) {
delete format[format.length - 1].y;
format[format.length - 1].x = true;
}
}
s.datapoints.format = format;
}
if (s.datapoints.pointsize != null)
continue; // already filled in
s.datapoints.pointsize = format.length;
ps = s.datapoints.pointsize;
points = s.datapoints.points;
var insertSteps = s.lines.show && s.lines.steps;
s.xaxis.used = s.yaxis.used = true;
for (j = k = 0; j < data.length; ++j, k += ps) {
p = data[j];
var nullify = p == null;
if (!nullify) {
for (m = 0; m < ps; ++m) {
val = p[m];
f = format[m];
if (f) {
if (f.number && val != null) {
val = +val; // convert to number
if (isNaN(val))
val = null;
else if (val == Infinity)
val = fakeInfinity;
else if (val == -Infinity)
val = -fakeInfinity;
}
if (val == null) {
if (f.required)
nullify = true;
if (f.defaultValue != null)
val = f.defaultValue;
}
}
points[k + m] = val;
}
}
if (nullify) {
for (m = 0; m < ps; ++m) {
val = points[k + m];
if (val != null) {
f = format[m];
// extract min/max info
if (f.autoscale !== false) {
if (f.x) {
updateAxis(s.xaxis, val, val);
}
if (f.y) {
updateAxis(s.yaxis, val, val);
}
}
}
points[k + m] = null;
}
}
else {
// a little bit of line specific stuff that
// perhaps shouldn't be here, but lacking
// better means...
if (insertSteps && k > 0
&& points[k - ps] != null
&& points[k - ps] != points[k]
&& points[k - ps + 1] != points[k + 1]) {
// copy the point to make room for a middle point
for (m = 0; m < ps; ++m)
points[k + ps + m] = points[k + m];
// middle point has same y
points[k + 1] = points[k - ps + 1];
// we've added a point, better reflect that
k += ps;
}
}
}
}
// give the hooks a chance to run
for (i = 0; i < series.length; ++i) {
s = series[i];
executeHooks(hooks.processDatapoints, [ s, s.datapoints]);
}
// second pass: find datamax/datamin for auto-scaling
for (i = 0; i < series.length; ++i) {
s = series[i];
points = s.datapoints.points;
ps = s.datapoints.pointsize;
format = s.datapoints.format;
var xmin = topSentry, ymin = topSentry,
xmax = bottomSentry, ymax = bottomSentry;
for (j = 0; j < points.length; j += ps) {
if (points[j] == null)
continue;
for (m = 0; m < ps; ++m) {
val = points[j + m];
f = format[m];
if (!f || f.autoscale === false || val == fakeInfinity || val == -fakeInfinity)
continue;
if (f.x) {
if (val < xmin)
xmin = val;
if (val > xmax)
xmax = val;
}
if (f.y) {
if (val < ymin)
ymin = val;
if (val > ymax)
ymax = val;
}
}
}
if (s.bars.show) {
// make sure we got room for the bar on the dancing floor
var delta;
switch (s.bars.align) {
case "left":
delta = 0;
break;
case "right":
delta = -s.bars.barWidth;
break;
default:
delta = -s.bars.barWidth / 2;
}
if (s.bars.horizontal) {
ymin += delta;
ymax += delta + s.bars.barWidth;
}
else {
xmin += delta;
xmax += delta + s.bars.barWidth;
}
}
updateAxis(s.xaxis, xmin, xmax);
updateAxis(s.yaxis, ymin, ymax);
}
$.each(allAxes(), function (_, axis) {
if (axis.datamin == topSentry)
axis.datamin = null;
if (axis.datamax == bottomSentry)
axis.datamax = null;
});
}
function setupCanvases() {
// Make sure the placeholder is clear of everything except canvases
// from a previous plot in this container that we'll try to re-use.
placeholder.css("padding", 0) // padding messes up the positioning
.children(":not(.flot-base,.flot-overlay)").remove();
if (placeholder.css("position") == 'static')
placeholder.css("position", "relative"); // for positioning labels and overlay
surface = new Canvas("flot-base", placeholder);
overlay = new Canvas("flot-overlay", placeholder); // overlay canvas for interactive features
ctx = surface.context;
octx = overlay.context;
// define which element we're listening for events on
eventHolder = $(overlay.element).unbind();
// If we're re-using a plot object, shut down the old one
var existing = placeholder.data("plot");
if (existing) {
existing.shutdown();
overlay.clear();
}
// save in case we get replotted
placeholder.data("plot", plot);
}
function bindEvents() {
// bind events
if (options.grid.hoverable) {
eventHolder.mousemove(onMouseMove);
// Use bind, rather than .mouseleave, because we officially
// still support jQuery 1.2.6, which doesn't define a shortcut
// for mouseenter or mouseleave. This was a bug/oversight that
// was fixed somewhere around 1.3.x. We can return to using
// .mouseleave when we drop support for 1.2.6.
eventHolder.bind("mouseleave", onMouseLeave);
}
if (options.grid.clickable)
eventHolder.click(onClick);
executeHooks(hooks.bindEvents, [eventHolder]);
}
function shutdown() {
if (redrawTimeout)
clearTimeout(redrawTimeout);
eventHolder.unbind("mousemove", onMouseMove);
eventHolder.unbind("mouseleave", onMouseLeave);
eventHolder.unbind("click", onClick);
executeHooks(hooks.shutdown, [eventHolder]);
}
function setTransformationHelpers(axis) {
// set helper functions on the axis, assumes plot area
// has been computed already
function identity(x) { return x; }
var s, m, t = axis.options.transform || identity,
it = axis.options.inverseTransform;
// precompute how much the axis is scaling a point
// in canvas space
if (axis.direction == "x") {
s = axis.scale = plotWidth / Math.abs(t(axis.max) - t(axis.min));
m = Math.min(t(axis.max), t(axis.min));
}
else {
s = axis.scale = plotHeight / Math.abs(t(axis.max) - t(axis.min));
s = -s;
m = Math.max(t(axis.max), t(axis.min));
}
// data point to canvas coordinate
if (t == identity) // slight optimization
axis.p2c = function (p) { return (p - m) * s; };
else
axis.p2c = function (p) { return (t(p) - m) * s; };
// canvas coordinate to data point
if (!it)
axis.c2p = function (c) { return m + c / s; };
else
axis.c2p = function (c) { return it(m + c / s); };
}
function measureTickLabels(axis) {
var opts = axis.options,
ticks = axis.ticks || [],
labelWidth = opts.labelWidth || 0,
labelHeight = opts.labelHeight || 0,
maxWidth = labelWidth || axis.direction == "x" ? Math.floor(surface.width / (ticks.length || 1)) : null,
legacyStyles = axis.direction + "Axis " + axis.direction + axis.n + "Axis",
layer = "flot-" + axis.direction + "-axis flot-" + axis.direction + axis.n + "-axis " + legacyStyles,
font = opts.font || "flot-tick-label tickLabel";
for (var i = 0; i < ticks.length; ++i) {
var t = ticks[i];
if (!t.label)
continue;
var info = surface.getTextInfo(layer, t.label, font, null, maxWidth);
labelWidth = Math.max(labelWidth, info.width);
labelHeight = Math.max(labelHeight, info.height);
}
axis.labelWidth = opts.labelWidth || labelWidth;
axis.labelHeight = opts.labelHeight || labelHeight;
}
function allocateAxisBoxFirstPhase(axis) {
// find the bounding box of the axis by looking at label
// widths/heights and ticks, make room by diminishing the
// plotOffset; this first phase only looks at one
// dimension per axis, the other dimension depends on the
// other axes so will have to wait
var lw = axis.labelWidth,
lh = axis.labelHeight,
pos = axis.options.position,
tickLength = axis.options.tickLength,
axisMargin = options.grid.axisMargin,
padding = options.grid.labelMargin,
all = axis.direction == "x" ? xaxes : yaxes,
index, innermost;
// determine axis margin
var samePosition = $.grep(all, function (a) {
return a && a.options.position == pos && a.reserveSpace;
});
if ($.inArray(axis, samePosition) == samePosition.length - 1)
axisMargin = 0; // outermost
// Determine whether the axis is the first (innermost) on its side
innermost = $.inArray(axis, samePosition) == 0;
// determine tick length - if we're innermost, we can use "full"
if (tickLength == null) {
if (innermost)
tickLength = "full";
else
tickLength = 5;
}
if (!isNaN(+tickLength))
padding += +tickLength;
// compute box
if (axis.direction == "x") {
lh += padding;
if (pos == "bottom") {
plotOffset.bottom += lh + axisMargin;
axis.box = { top: surface.height - plotOffset.bottom, height: lh };
}
else {
axis.box = { top: plotOffset.top + axisMargin, height: lh };
plotOffset.top += lh + axisMargin;
}
}
else {
lw += padding;
if (pos == "left") {
axis.box = { left: plotOffset.left + axisMargin, width: lw };
plotOffset.left += lw + axisMargin;
}
else {
plotOffset.right += lw + axisMargin;
axis.box = { left: surface.width - plotOffset.right, width: lw };
}
}
// save for future reference
axis.position = pos;
axis.tickLength = tickLength;
axis.box.padding = padding;
axis.innermost = innermost;
}
function allocateAxisBoxSecondPhase(axis) {
// now that all axis boxes have been placed in one
// dimension, we can set the remaining dimension coordinates
if (axis.direction == "x") {
axis.box.left = plotOffset.left - axis.labelWidth / 2;
axis.box.width = surface.width - plotOffset.left - plotOffset.right + axis.labelWidth;
}
else {
axis.box.top = plotOffset.top - axis.labelHeight / 2;
axis.box.height = surface.height - plotOffset.bottom - plotOffset.top + axis.labelHeight;
}
}
function adjustLayoutForThingsStickingOut() {
// possibly adjust plot offset to ensure everything stays
// inside the canvas and isn't clipped off
var minMargin = options.grid.minBorderMargin,
margins = { x: 0, y: 0 }, i, axis;
// check stuff from the plot (FIXME: this should just read
// a value from the series, otherwise it's impossible to
// customize)
if (minMargin == null) {
minMargin = 0;
for (i = 0; i < series.length; ++i)
minMargin = Math.max(minMargin, 2 * (series[i].points.radius + series[i].points.lineWidth/2));
}
margins.x = margins.y = Math.ceil(minMargin);
// check axis labels, note we don't check the actual
// labels but instead use the overall width/height to not
// jump as much around with replots
$.each(allAxes(), function (_, axis) {
var dir = axis.direction;
if (axis.reserveSpace)
margins[dir] = Math.ceil(Math.max(margins[dir], (dir == "x" ? axis.labelWidth : axis.labelHeight) / 2));
});
plotOffset.left = Math.max(margins.x, plotOffset.left);
plotOffset.right = Math.max(margins.x, plotOffset.right);
plotOffset.top = Math.max(margins.y, plotOffset.top);
plotOffset.bottom = Math.max(margins.y, plotOffset.bottom);
}
function setupGrid() {
var i, axes = allAxes(), showGrid = options.grid.show;
// Initialize the plot's offset from the edge of the canvas
for (var a in plotOffset) {
var margin = options.grid.margin || 0;
plotOffset[a] = typeof margin == "number" ? margin : margin[a] || 0;
}
executeHooks(hooks.processOffset, [plotOffset]);
// If the grid is visible, add its border width to the offset
for (var a in plotOffset) {
if(typeof(options.grid.borderWidth) == "object") {
plotOffset[a] += showGrid ? options.grid.borderWidth[a] : 0;
}
else {
plotOffset[a] += showGrid ? options.grid.borderWidth : 0;
}
}
// init axes
$.each(axes, function (_, axis) {
axis.show = axis.options.show;
if (axis.show == null)
axis.show = axis.used; // by default an axis is visible if it's got data
axis.reserveSpace = axis.show || axis.options.reserveSpace;
setRange(axis);
});
if (showGrid) {
var allocatedAxes = $.grep(axes, function (axis) { return axis.reserveSpace; });
$.each(allocatedAxes, function (_, axis) {
// make the ticks
setupTickGeneration(axis);
setTicks(axis);
snapRangeToTicks(axis, axis.ticks);
// find labelWidth/Height for axis
measureTickLabels(axis);
});
// with all dimensions calculated, we can compute the
// axis bounding boxes, start from the outside
// (reverse order)
for (i = allocatedAxes.length - 1; i >= 0; --i)
allocateAxisBoxFirstPhase(allocatedAxes[i]);
// make sure we've got enough space for things that
// might stick out
adjustLayoutForThingsStickingOut();
$.each(allocatedAxes, function (_, axis) {
allocateAxisBoxSecondPhase(axis);
});
}
plotWidth = surface.width - plotOffset.left - plotOffset.right;
plotHeight = surface.height - plotOffset.bottom - plotOffset.top;
// now we got the proper plot dimensions, we can compute the scaling
$.each(axes, function (_, axis) {
setTransformationHelpers(axis);
});
if (showGrid) {
drawAxisLabels();
}
insertLegend();
}
function setRange(axis) {
var opts = axis.options,
min = +(opts.min != null ? opts.min : axis.datamin),
max = +(opts.max != null ? opts.max : axis.datamax),
delta = max - min;
if (delta == 0.0) {
// degenerate case
var widen = max == 0 ? 1 : 0.01;
if (opts.min == null)
min -= widen;
// always widen max if we couldn't widen min to ensure we
// don't fall into min == max which doesn't work
if (opts.max == null || opts.min != null)
max += widen;
}
else {
// consider autoscaling
var margin = opts.autoscaleMargin;
if (margin != null) {
if (opts.min == null) {
min -= delta * margin;
// make sure we don't go below zero if all values
// are positive
if (min < 0 && axis.datamin != null && axis.datamin >= 0)
min = 0;
}
if (opts.max == null) {
max += delta * margin;
if (max > 0 && axis.datamax != null && axis.datamax <= 0)
max = 0;
}
}
}
axis.min = min;
axis.max = max;
}
function setupTickGeneration(axis) {
var opts = axis.options;
// estimate number of ticks
var noTicks;
if (typeof opts.ticks == "number" && opts.ticks > 0)
noTicks = opts.ticks;
else
// heuristic based on the model a*sqrt(x) fitted to
// some data points that seemed reasonable
noTicks = 0.3 * Math.sqrt(axis.direction == "x" ? surface.width : surface.height);
var delta = (axis.max - axis.min) / noTicks,
dec = -Math.floor(Math.log(delta) / Math.LN10),
maxDec = opts.tickDecimals;
if (maxDec != null && dec > maxDec) {
dec = maxDec;
}
var magn = Math.pow(10, -dec),
norm = delta / magn, // norm is between 1.0 and 10.0
size;
if (norm < 1.5) {
size = 1;
} else if (norm < 3) {
size = 2;
// special case for 2.5, requires an extra decimal
if (norm > 2.25 && (maxDec == null || dec + 1 <= maxDec)) {
size = 2.5;
++dec;
}
} else if (norm < 7.5) {
size = 5;
} else {
size = 10;
}
size *= magn;
if (opts.minTickSize != null && size < opts.minTickSize) {
size = opts.minTickSize;
}
axis.delta = delta;
axis.tickDecimals = Math.max(0, maxDec != null ? maxDec : dec);
axis.tickSize = opts.tickSize || size;
// Time mode was moved to a plug-in in 0.8, but since so many people use this
// we'll add an especially friendly make sure they remembered to include it.
if (opts.mode == "time" && !axis.tickGenerator) {
throw new Error("Time mode requires the flot.time plugin.");
}
// Flot supports base-10 axes; any other mode else is handled by a plug-in,
// like flot.time.js.
if (!axis.tickGenerator) {
axis.tickGenerator = function (axis) {
var ticks = [],
start = floorInBase(axis.min, axis.tickSize),
i = 0,
v = Number.NaN,
prev;
do {
prev = v;
v = start + i * axis.tickSize;
ticks.push(v);
++i;
} while (v < axis.max && v != prev);
return ticks;
};
axis.tickFormatter = function (value, axis) {
var factor = axis.tickDecimals ? Math.pow(10, axis.tickDecimals) : 1; var formatted = "" + Math.round(value * factor) / factor;
// If tickDecimals was specified, ensure that we have exactly that // much precision; otherwise default to the value's own precision.
if (axis.tickDecimals != null) { var decimal = formatted.indexOf("."); var precision = decimal == -1 ? 0 : formatted.length - decimal - 1; if (precision < axis.tickDecimals) { return (precision ? formatted : formatted + ".") + ("" + factor).substr(1, axis.tickDecimals - precision); } }
return formatted;
};
}
if ($.isFunction(opts.tickFormatter))
axis.tickFormatter = function (v, axis) { return "" + opts.tickFormatter(v, axis); };
if (opts.alignTicksWithAxis != null) {
var otherAxis = (axis.direction == "x" ? xaxes : yaxes)[opts.alignTicksWithAxis - 1];
if (otherAxis && otherAxis.used && otherAxis != axis) {
// consider snapping min/max to outermost nice ticks
var niceTicks = axis.tickGenerator(axis);
if (niceTicks.length > 0) {
if (opts.min == null)
axis.min = Math.min(axis.min, niceTicks[0]);
if (opts.max == null && niceTicks.length > 1)
axis.max = Math.max(axis.max, niceTicks[niceTicks.length - 1]);
}
axis.tickGenerator = function (axis) {
// copy ticks, scaled to this axis
var ticks = [], v, i;
for (i = 0; i < otherAxis.ticks.length; ++i) {
v = (otherAxis.ticks[i].v - otherAxis.min) / (otherAxis.max - otherAxis.min);
v = axis.min + v * (axis.max - axis.min);
ticks.push(v);
}
return ticks;
};
// we might need an extra decimal since forced
// ticks don't necessarily fit naturally
if (!axis.mode && opts.tickDecimals == null) {
var extraDec = Math.max(0, -Math.floor(Math.log(axis.delta) / Math.LN10) + 1),
ts = axis.tickGenerator(axis);
// only proceed if the tick interval rounded
// with an extra decimal doesn't give us a
// zero at end
if (!(ts.length > 1 && /\..*0$/.test((ts[1] - ts[0]).toFixed(extraDec))))
axis.tickDecimals = extraDec;
}
}
}
}
function setTicks(axis) {
var oticks = axis.options.ticks, ticks = [];
if (oticks == null || (typeof oticks == "number" && oticks > 0))
ticks = axis.tickGenerator(axis);
else if (oticks) {
if ($.isFunction(oticks))
// generate the ticks
ticks = oticks(axis);
else
ticks = oticks;
}
// clean up/labelify the supplied ticks, copy them over
var i, v;
axis.ticks = [];
for (i = 0; i < ticks.length; ++i) {
var label = null;
var t = ticks[i];
if (typeof t == "object") {
v = +t[0];
if (t.length > 1)
label = t[1];
}
else
v = +t;
if (label == null)
label = axis.tickFormatter(v, axis);
if (!isNaN(v))
axis.ticks.push({ v: v, label: label });
}
}
function snapRangeToTicks(axis, ticks) {
if (axis.options.autoscaleMargin && ticks.length > 0) {
// snap to ticks
if (axis.options.min == null)
axis.min = Math.min(axis.min, ticks[0].v);
if (axis.options.max == null && ticks.length > 1)
axis.max = Math.max(axis.max, ticks[ticks.length - 1].v);
}
}
function draw() {
surface.clear();
executeHooks(hooks.drawBackground, [ctx]);
var grid = options.grid;
// draw background, if any
if (grid.show && grid.backgroundColor)
drawBackground();
if (grid.show && !grid.aboveData) {
drawGrid();
}
for (var i = 0; i < series.length; ++i) {
executeHooks(hooks.drawSeries, [ctx, series[i]]);
drawSeries(series[i]);
}
executeHooks(hooks.draw, [ctx]);
if (grid.show && grid.aboveData) {
drawGrid();
}
surface.render();
// A draw implies that either the axes or data have changed, so we
// should probably update the overlay highlights as well.
triggerRedrawOverlay();
}
function extractRange(ranges, coord) {
var axis, from, to, key, axes = allAxes();
for (var i = 0; i < axes.length; ++i) {
axis = axes[i];
if (axis.direction == coord) {
key = coord + axis.n + "axis";
if (!ranges[key] && axis.n == 1)
key = coord + "axis"; // support x1axis as xaxis
if (ranges[key]) {
from = ranges[key].from;
to = ranges[key].to;
break;
}
}
}
// backwards-compat stuff - to be removed in future
if (!ranges[key]) {
axis = coord == "x" ? xaxes[0] : yaxes[0];
from = ranges[coord + "1"];
to = ranges[coord + "2"];
}
// auto-reverse as an added bonus
if (from != null && to != null && from > to) {
var tmp = from;
from = to;
to = tmp;
}
return { from: from, to: to, axis: axis };
}
function drawBackground() {
ctx.save();
ctx.translate(plotOffset.left, plotOffset.top);
ctx.fillStyle = getColorOrGradient(options.grid.backgroundColor, plotHeight, 0, "rgba(255, 255, 255, 0)");
ctx.fillRect(0, 0, plotWidth, plotHeight);
ctx.restore();
}
function drawGrid() {
var i, axes, bw, bc;
ctx.save();
ctx.translate(plotOffset.left, plotOffset.top);
// draw markings
var markings = options.grid.markings;
if (markings) {
if ($.isFunction(markings)) {
axes = plot.getAxes();
// xmin etc. is backwards compatibility, to be
// removed in the future
axes.xmin = axes.xaxis.min;
axes.xmax = axes.xaxis.max;
axes.ymin = axes.yaxis.min;
axes.ymax = axes.yaxis.max;
markings = markings(axes);
}
for (i = 0; i < markings.length; ++i) {
var m = markings[i],
xrange = extractRange(m, "x"),
yrange = extractRange(m, "y");
// fill in missing
if (xrange.from == null)
xrange.from = xrange.axis.min;
if (xrange.to == null)
xrange.to = xrange.axis.max;
if (yrange.from == null)
yrange.from = yrange.axis.min;
if (yrange.to == null)
yrange.to = yrange.axis.max;
// clip
if (xrange.to < xrange.axis.min || xrange.from > xrange.axis.max ||
yrange.to < yrange.axis.min || yrange.from > yrange.axis.max)
continue;
xrange.from = Math.max(xrange.from, xrange.axis.min);
xrange.to = Math.min(xrange.to, xrange.axis.max);
yrange.from = Math.max(yrange.from, yrange.axis.min);
yrange.to = Math.min(yrange.to, yrange.axis.max);
if (xrange.from == xrange.to && yrange.from == yrange.to)
continue;
// then draw
xrange.from = xrange.axis.p2c(xrange.from);
xrange.to = xrange.axis.p2c(xrange.to);
yrange.from = yrange.axis.p2c(yrange.from);
yrange.to = yrange.axis.p2c(yrange.to);
if (xrange.from == xrange.to || yrange.from == yrange.to) {
// draw line
ctx.beginPath();
ctx.strokeStyle = m.color || options.grid.markingsColor;
ctx.lineWidth = m.lineWidth || options.grid.markingsLineWidth;
ctx.moveTo(xrange.from, yrange.from);
ctx.lineTo(xrange.to, yrange.to);
ctx.stroke();
}
else {
// fill area
ctx.fillStyle = m.color || options.grid.markingsColor;
ctx.fillRect(xrange.from, yrange.to,
xrange.to - xrange.from,
yrange.from - yrange.to);
}
}
}
// draw the ticks
axes = allAxes();
bw = options.grid.borderWidth;
for (var j = 0; j < axes.length; ++j) {
var axis = axes[j], box = axis.box,
t = axis.tickLength, x, y, xoff, yoff;
if (!axis.show || axis.ticks.length == 0)
continue;
ctx.lineWidth = 1;
// find the edges
if (axis.direction == "x") {
x = 0;
if (t == "full")
y = (axis.position == "top" ? 0 : plotHeight);
else
y = box.top - plotOffset.top + (axis.position == "top" ? box.height : 0);
}
else {
y = 0;
if (t == "full")
x = (axis.position == "left" ? 0 : plotWidth);
else
x = box.left - plotOffset.left + (axis.position == "left" ? box.width : 0);
}
// draw tick bar
if (!axis.innermost) {
ctx.strokeStyle = axis.options.color;
ctx.beginPath();
xoff = yoff = 0;
if (axis.direction == "x")
xoff = plotWidth + 1;
else
yoff = plotHeight + 1;
if (ctx.lineWidth == 1) {
if (axis.direction == "x") {
y = Math.floor(y) + 0.5;
} else {
x = Math.floor(x) + 0.5;
}
}
ctx.moveTo(x, y);
ctx.lineTo(x + xoff, y + yoff);
ctx.stroke();
}
// draw ticks
ctx.strokeStyle = axis.options.tickColor;
ctx.beginPath();
for (i = 0; i < axis.ticks.length; ++i) {
var v = axis.ticks[i].v;
xoff = yoff = 0;
if (isNaN(v) || v < axis.min || v > axis.max
// skip those lying on the axes if we got a border
|| (t == "full"
&& ((typeof bw == "object" && bw[axis.position] > 0) || bw > 0)
&& (v == axis.min || v == axis.max)))
continue;
if (axis.direction == "x") {
x = axis.p2c(v);
yoff = t == "full" ? -plotHeight : t;
if (axis.position == "top")
yoff = -yoff;
}
else {
y = axis.p2c(v);
xoff = t == "full" ? -plotWidth : t;
if (axis.position == "left")
xoff = -xoff;
}
if (ctx.lineWidth == 1) {
if (axis.direction == "x")
x = Math.floor(x) + 0.5;
else
y = Math.floor(y) + 0.5;
}
ctx.moveTo(x, y);
ctx.lineTo(x + xoff, y + yoff);
}
ctx.stroke();
}
// draw border
if (bw) {
// If either borderWidth or borderColor is an object, then draw the border
// line by line instead of as one rectangle
bc = options.grid.borderColor;
if(typeof bw == "object" || typeof bc == "object") {
if (typeof bw !== "object") {
bw = {top: bw, right: bw, bottom: bw, left: bw};
}
if (typeof bc !== "object") {
bc = {top: bc, right: bc, bottom: bc, left: bc};
}
if (bw.top > 0) {
ctx.strokeStyle = bc.top;
ctx.lineWidth = bw.top;
ctx.beginPath();
ctx.moveTo(0 - bw.left, 0 - bw.top/2);
ctx.lineTo(plotWidth, 0 - bw.top/2);
ctx.stroke();
}
if (bw.right > 0) {
ctx.strokeStyle = bc.right;
ctx.lineWidth = bw.right;
ctx.beginPath();
ctx.moveTo(plotWidth + bw.right / 2, 0 - bw.top);
ctx.lineTo(plotWidth + bw.right / 2, plotHeight);
ctx.stroke();
}
if (bw.bottom > 0) {
ctx.strokeStyle = bc.bottom;
ctx.lineWidth = bw.bottom;
ctx.beginPath();
ctx.moveTo(plotWidth + bw.right, plotHeight + bw.bottom / 2);
ctx.lineTo(0, plotHeight + bw.bottom / 2);
ctx.stroke();
}
if (bw.left > 0) {
ctx.strokeStyle = bc.left;
ctx.lineWidth = bw.left;
ctx.beginPath();
ctx.moveTo(0 - bw.left/2, plotHeight + bw.bottom);
ctx.lineTo(0- bw.left/2, 0);
ctx.stroke();
}
}
else {
ctx.lineWidth = bw;
ctx.strokeStyle = options.grid.borderColor;
ctx.strokeRect(-bw/2, -bw/2, plotWidth + bw, plotHeight + bw);
}
}
ctx.restore();
}
function drawAxisLabels() {
$.each(allAxes(), function (_, axis) {
var box = axis.box,
legacyStyles = axis.direction + "Axis " + axis.direction + axis.n + "Axis",
layer = "flot-" + axis.direction + "-axis flot-" + axis.direction + axis.n + "-axis " + legacyStyles,
font = axis.options.font || "flot-tick-label tickLabel",
tick, x, y, halign, valign;
// Remove text before checking for axis.show and ticks.length;
// otherwise plugins, like flot-tickrotor, that draw their own
// tick labels will end up with both theirs and the defaults.
surface.removeText(layer);
if (!axis.show || axis.ticks.length == 0)
return;
for (var i = 0; i < axis.ticks.length; ++i) {
tick = axis.ticks[i];
if (!tick.label || tick.v < axis.min || tick.v > axis.max)
continue;
if (axis.direction == "x") {
halign = "center";
x = plotOffset.left + axis.p2c(tick.v);
if (axis.position == "bottom") {
y = box.top + box.padding;
} else {
y = box.top + box.height - box.padding;
valign = "bottom";
}
} else {
valign = "middle";
y = plotOffset.top + axis.p2c(tick.v);
if (axis.position == "left") {
x = box.left + box.width - box.padding;
halign = "right";
} else {
x = box.left + box.padding;
}
}
surface.addText(layer, x, y, tick.label, font, null, null, halign, valign);
}
});
}
function drawSeries(series) {
if (series.lines.show)
drawSeriesLines(series);
if (series.bars.show)
drawSeriesBars(series);
if (series.points.show)
drawSeriesPoints(series);
}
function drawSeriesLines(series) {
function plotLine(datapoints, xoffset, yoffset, axisx, axisy) {
var points = datapoints.points,
ps = datapoints.pointsize,
prevx = null, prevy = null;
ctx.beginPath();
for (var i = ps; i < points.length; i += ps) {
var x1 = points[i - ps], y1 = points[i - ps + 1],
x2 = points[i], y2 = points[i + 1];
if (x1 == null || x2 == null)
continue;
// clip with ymin
if (y1 <= y2 && y1 < axisy.min) {
if (y2 < axisy.min)
continue; // line segment is outside
// compute new intersection point
x1 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
y1 = axisy.min;
}
else if (y2 <= y1 && y2 < axisy.min) {
if (y1 < axisy.min)
continue;
x2 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
y2 = axisy.min;
}
// clip with ymax
if (y1 >= y2 && y1 > axisy.max) {
if (y2 > axisy.max)
continue;
x1 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
y1 = axisy.max;
}
else if (y2 >= y1 && y2 > axisy.max) {
if (y1 > axisy.max)
continue;
x2 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
y2 = axisy.max;
}
// clip with xmin
if (x1 <= x2 && x1 < axisx.min) {
if (x2 < axisx.min)
continue;
y1 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
x1 = axisx.min;
}
else if (x2 <= x1 && x2 < axisx.min) {
if (x1 < axisx.min)
continue;
y2 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
x2 = axisx.min;
}
// clip with xmax
if (x1 >= x2 && x1 > axisx.max) {
if (x2 > axisx.max)
continue;
y1 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
x1 = axisx.max;
}
else if (x2 >= x1 && x2 > axisx.max) {
if (x1 > axisx.max)
continue;
y2 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
x2 = axisx.max;
}
if (x1 != prevx || y1 != prevy)
ctx.moveTo(axisx.p2c(x1) + xoffset, axisy.p2c(y1) + yoffset);
prevx = x2;
prevy = y2;
ctx.lineTo(axisx.p2c(x2) + xoffset, axisy.p2c(y2) + yoffset);
}
ctx.stroke();
}
function plotLineArea(datapoints, axisx, axisy) {
var points = datapoints.points,
ps = datapoints.pointsize,
bottom = Math.min(Math.max(0, axisy.min), axisy.max),
i = 0, top, areaOpen = false,
ypos = 1, segmentStart = 0, segmentEnd = 0;
// we process each segment in two turns, first forward
// direction to sketch out top, then once we hit the
// end we go backwards to sketch the bottom
while (true) {
if (ps > 0 && i > points.length + ps)
break;
i += ps; // ps is negative if going backwards
var x1 = points[i - ps],
y1 = points[i - ps + ypos],
x2 = points[i], y2 = points[i + ypos];
if (areaOpen) {
if (ps > 0 && x1 != null && x2 == null) {
// at turning point
segmentEnd = i;
ps = -ps;
ypos = 2;
continue;
}
if (ps < 0 && i == segmentStart + ps) {
// done with the reverse sweep
ctx.fill();
areaOpen = false;
ps = -ps;
ypos = 1;
i = segmentStart = segmentEnd + ps;
continue;
}
}
if (x1 == null || x2 == null)
continue;
// clip x values
// clip with xmin
if (x1 <= x2 && x1 < axisx.min) {
if (x2 < axisx.min)
continue;
y1 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
x1 = axisx.min;
}
else if (x2 <= x1 && x2 < axisx.min) {
if (x1 < axisx.min)
continue;
y2 = (axisx.min - x1) / (x2 - x1) * (y2 - y1) + y1;
x2 = axisx.min;
}
// clip with xmax
if (x1 >= x2 && x1 > axisx.max) {
if (x2 > axisx.max)
continue;
y1 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
x1 = axisx.max;
}
else if (x2 >= x1 && x2 > axisx.max) {
if (x1 > axisx.max)
continue;
y2 = (axisx.max - x1) / (x2 - x1) * (y2 - y1) + y1;
x2 = axisx.max;
}
if (!areaOpen) {
// open area
ctx.beginPath();
ctx.moveTo(axisx.p2c(x1), axisy.p2c(bottom));
areaOpen = true;
}
// now first check the case where both is outside
if (y1 >= axisy.max && y2 >= axisy.max) {
ctx.lineTo(axisx.p2c(x1), axisy.p2c(axisy.max));
ctx.lineTo(axisx.p2c(x2), axisy.p2c(axisy.max));
continue;
}
else if (y1 <= axisy.min && y2 <= axisy.min) {
ctx.lineTo(axisx.p2c(x1), axisy.p2c(axisy.min));
ctx.lineTo(axisx.p2c(x2), axisy.p2c(axisy.min));
continue;
}
// else it's a bit more complicated, there might
// be a flat maxed out rectangle first, then a
// triangular cutout or reverse; to find these
// keep track of the current x values
var x1old = x1, x2old = x2;
// clip the y values, without shortcutting, we
// go through all cases in turn
// clip with ymin
if (y1 <= y2 && y1 < axisy.min && y2 >= axisy.min) {
x1 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
y1 = axisy.min;
}
else if (y2 <= y1 && y2 < axisy.min && y1 >= axisy.min) {
x2 = (axisy.min - y1) / (y2 - y1) * (x2 - x1) + x1;
y2 = axisy.min;
}
// clip with ymax
if (y1 >= y2 && y1 > axisy.max && y2 <= axisy.max) {
x1 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
y1 = axisy.max;
}
else if (y2 >= y1 && y2 > axisy.max && y1 <= axisy.max) {
x2 = (axisy.max - y1) / (y2 - y1) * (x2 - x1) + x1;
y2 = axisy.max;
}
// if the x value was changed we got a rectangle
// to fill
if (x1 != x1old) {
ctx.lineTo(axisx.p2c(x1old), axisy.p2c(y1));
// it goes to (x1, y1), but we fill that below
}
// fill triangular section, this sometimes result
// in redundant points if (x1, y1) hasn't changed
// from previous line to, but we just ignore that
ctx.lineTo(axisx.p2c(x1), axisy.p2c(y1));
ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2));
// fill the other rectangle if it's there
if (x2 != x2old) {
ctx.lineTo(axisx.p2c(x2), axisy.p2c(y2));
ctx.lineTo(axisx.p2c(x2old), axisy.p2c(y2));
}
}
}
ctx.save();
ctx.translate(plotOffset.left, plotOffset.top);
ctx.lineJoin = "round";
var lw = series.lines.lineWidth,
sw = series.shadowSize;
// FIXME: consider another form of shadow when filling is turned on
if (lw > 0 && sw > 0) {
// draw shadow as a thick and thin line with transparency
ctx.lineWidth = sw;
ctx.strokeStyle = "rgba(0,0,0,0.1)";
// position shadow at angle from the mid of line
var angle = Math.PI/18;
plotLine(series.datapoints, Math.sin(angle) * (lw/2 + sw/2), Math.cos(angle) * (lw/2 + sw/2), series.xaxis, series.yaxis);
ctx.lineWidth = sw/2;
plotLine(series.datapoints, Math.sin(angle) * (lw/2 + sw/4), Math.cos(angle) * (lw/2 + sw/4), series.xaxis, series.yaxis);
}
ctx.lineWidth = lw;
ctx.strokeStyle = series.color;
var fillStyle = getFillStyle(series.lines, series.color, 0, plotHeight);
if (fillStyle) {
ctx.fillStyle = fillStyle;
plotLineArea(series.datapoints, series.xaxis, series.yaxis);
}
if (lw > 0)
plotLine(series.datapoints, 0, 0, series.xaxis, series.yaxis);
ctx.restore();
}
function drawSeriesPoints(series) {
function plotPoints(datapoints, radius, fillStyle, offset, shadow, axisx, axisy, symbol) {
var points = datapoints.points, ps = datapoints.pointsize;
for (var i = 0; i < points.length; i += ps) {
var x = points[i], y = points[i + 1];
if (x == null || x < axisx.min || x > axisx.max || y < axisy.min || y > axisy.max)
continue;
ctx.beginPath();
x = axisx.p2c(x);
y = axisy.p2c(y) + offset;
if (symbol == "circle")
ctx.arc(x, y, radius, 0, shadow ? Math.PI : Math.PI * 2, false);
else
symbol(ctx, x, y, radius, shadow);
ctx.closePath();
if (fillStyle) {
ctx.fillStyle = fillStyle;
ctx.fill();
}
ctx.stroke();
}
}
ctx.save();
ctx.translate(plotOffset.left, plotOffset.top);
var lw = series.points.lineWidth,
sw = series.shadowSize,
radius = series.points.radius,
symbol = series.points.symbol;
// If the user sets the line width to 0, we change it to a very
// small value. A line width of 0 seems to force the default of 1.
// Doing the conditional here allows the shadow setting to still be
// optional even with a lineWidth of 0.
if( lw == 0 )
lw = 0.0001;
if (lw > 0 && sw > 0) {
// draw shadow in two steps
var w = sw / 2;
ctx.lineWidth = w;
ctx.strokeStyle = "rgba(0,0,0,0.1)";
plotPoints(series.datapoints, radius, null, w + w/2, true,
series.xaxis, series.yaxis, symbol);
ctx.strokeStyle = "rgba(0,0,0,0.2)";
plotPoints(series.datapoints, radius, null, w/2, true,
series.xaxis, series.yaxis, symbol);
}
ctx.lineWidth = lw;
ctx.strokeStyle = series.color;
plotPoints(series.datapoints, radius,
getFillStyle(series.points, series.color), 0, false,
series.xaxis, series.yaxis, symbol);
ctx.restore();
}
function drawBar(x, y, b, barLeft, barRight, fillStyleCallback, axisx, axisy, c, horizontal, lineWidth) {
var left, right, bottom, top,
drawLeft, drawRight, drawTop, drawBottom,
tmp;
// in horizontal mode, we start the bar from the left
// instead of from the bottom so it appears to be
// horizontal rather than vertical
if (horizontal) {
drawBottom = drawRight = drawTop = true;
drawLeft = false;
left = b;
right = x;
top = y + barLeft;
bottom = y + barRight;
// account for negative bars
if (right < left) {
tmp = right;
right = left;
left = tmp;
drawLeft = true;
drawRight = false;
}
}
else {
drawLeft = drawRight = drawTop = true;
drawBottom = false;
left = x + barLeft;
right = x + barRight;
bottom = b;
top = y;
// account for negative bars
if (top < bottom) {
tmp = top;
top = bottom;
bottom = tmp;
drawBottom = true;
drawTop = false;
}
}
// clip
if (right < axisx.min || left > axisx.max ||
top < axisy.min || bottom > axisy.max)
return;
if (left < axisx.min) {
left = axisx.min;
drawLeft = false;
}
if (right > axisx.max) {
right = axisx.max;
drawRight = false;
}
if (bottom < axisy.min) {
bottom = axisy.min;
drawBottom = false;
}
if (top > axisy.max) {
top = axisy.max;
drawTop = false;
}
left = axisx.p2c(left);
bottom = axisy.p2c(bottom);
right = axisx.p2c(right);
top = axisy.p2c(top);
// fill the bar
if (fillStyleCallback) {
c.fillStyle = fillStyleCallback(bottom, top);
c.fillRect(left, top, right - left, bottom - top)
}
// draw outline
if (lineWidth > 0 && (drawLeft || drawRight || drawTop || drawBottom)) {
c.beginPath();
// FIXME: inline moveTo is buggy with excanvas
c.moveTo(left, bottom);
if (drawLeft)
c.lineTo(left, top);
else
c.moveTo(left, top);
if (drawTop)
c.lineTo(right, top);
else
c.moveTo(right, top);
if (drawRight)
c.lineTo(right, bottom);
else
c.moveTo(right, bottom);
if (drawBottom)
c.lineTo(left, bottom);
else
c.moveTo(left, bottom);
c.stroke();
}
}
function drawSeriesBars(series) {
function plotBars(datapoints, barLeft, barRight, fillStyleCallback, axisx, axisy) {
var points = datapoints.points, ps = datapoints.pointsize;
for (var i = 0; i < points.length; i += ps) {
if (points[i] == null)
continue;
drawBar(points[i], points[i + 1], points[i + 2], barLeft, barRight, fillStyleCallback, axisx, axisy, ctx, series.bars.horizontal, series.bars.lineWidth);
}
}
ctx.save();
ctx.translate(plotOffset.left, plotOffset.top);
// FIXME: figure out a way to add shadows (for instance along the right edge)
ctx.lineWidth = series.bars.lineWidth;
ctx.strokeStyle = series.color;
var barLeft;
switch (series.bars.align) {
case "left":
barLeft = 0;
break;
case "right":
barLeft = -series.bars.barWidth;
break;
default:
barLeft = -series.bars.barWidth / 2;
}
var fillStyleCallback = series.bars.fill ? function (bottom, top) { return getFillStyle(series.bars, series.color, bottom, top); } : null;
plotBars(series.datapoints, barLeft, barLeft + series.bars.barWidth, fillStyleCallback, series.xaxis, series.yaxis);
ctx.restore();
}
function getFillStyle(filloptions, seriesColor, bottom, top) {
var fill = filloptions.fill;
if (!fill)
return null;
if (filloptions.fillColor)
return getColorOrGradient(filloptions.fillColor, bottom, top, seriesColor);
var c = $.color.parse(seriesColor);
c.a = typeof fill == "number" ? fill : 0.4;
c.normalize();
return c.toString();
}
function insertLegend() {
placeholder.find(".legend").remove();
if (!options.legend.show)
return;
var fragments = [], entries = [], rowStarted = false,
lf = options.legend.labelFormatter, s, label;
// Build a list of legend entries, with each having a label and a color
for (var i = 0; i < series.length; ++i) {
s = series[i];
if (s.label) {
label = lf ? lf(s.label, s) : s.label;
if (label) {
entries.push({
label: label,
color: s.color
});
}
}
}
// Sort the legend using either the default or a custom comparator
if (options.legend.sorted) {
if ($.isFunction(options.legend.sorted)) {
entries.sort(options.legend.sorted);
} else if (options.legend.sorted == "reverse") {
entries.reverse();
} else {
var ascending = options.legend.sorted != "descending";
entries.sort(function(a, b) {
return a.label == b.label ? 0 : (
(a.label < b.label) != ascending ? 1 : -1 // Logical XOR
);
});
}
}
// Generate markup for the list of entries, in their final order
for (var i = 0; i < entries.length; ++i) {
var entry = entries[i];
if (i % options.legend.noColumns == 0) {
if (rowStarted)
fragments.push('</tr>');
fragments.push('<tr>');
rowStarted = true;
}
fragments.push('<td class="legendColorBox">
'<td class="legendLabel">' + entry.label + '</td>'
);
}
if (rowStarted)
fragments.push('</tr>');
if (fragments.length == 0)
return;
var table = ' if (options.legend.container != null)
$(options.legend.container).html(table);
else {
var pos = "",
p = options.legend.position,
m = options.legend.margin;
if (m[0] == null)
m = [m, m];
if (p.charAt(0) == "n")
pos += 'top:' + (m[1] + plotOffset.top) + 'px;';
else if (p.charAt(0) == "s")
pos += 'bottom:' + (m[1] + plotOffset.bottom) + 'px;';
if (p.charAt(1) == "e")
pos += 'right:' + (m[0] + plotOffset.right) + 'px;';
else if (p.charAt(1) == "w")
pos += 'left:' + (m[0] + plotOffset.left) + 'px;';
var legend = $(' if (options.legend.backgroundOpacity != 0.0) {
// put in the transparent background
// separately to avoid blended labels and
// label boxes
var c = options.legend.backgroundColor;
if (c == null) {
c = options.grid.backgroundColor;
if (c && typeof c == "string")
c = $.color.parse(c);
else
c = $.color.extract(legend, 'background-color');
c.a = 1;
c = c.toString();
}
var div = legend.children();
$(' }
}
}
// interactive features
var highlights = [],
redrawTimeout = null;
// returns the data item the mouse is over, or null if none is found
function findNearbyItem(mouseX, mouseY, seriesFilter) {
var maxDistance = options.grid.mouseActiveRadius,
smallestDistance = maxDistance * maxDistance + 1,
item = null, foundPoint = false, i, j, ps;
for (i = series.length - 1; i >= 0; --i) {
if (!seriesFilter(series[i]))
continue;
var s = series[i],
axisx = s.xaxis,
axisy = s.yaxis,
points = s.datapoints.points,
mx = axisx.c2p(mouseX), // precompute some stuff to make the loop faster
my = axisy.c2p(mouseY),
maxx = maxDistance / axisx.scale,
maxy = maxDistance / axisy.scale;
ps = s.datapoints.pointsize;
// with inverse transforms, we can't use the maxx/maxy
// optimization, sadly
if (axisx.options.inverseTransform)
maxx = Number.MAX_VALUE;
if (axisy.options.inverseTransform)
maxy = Number.MAX_VALUE;
if (s.lines.show || s.points.show) {
for (j = 0; j < points.length; j += ps) {
var x = points[j], y = points[j + 1];
if (x == null)
continue;
// For points and lines, the cursor must be within a
// certain distance to the data point
if (x - mx > maxx || x - mx < -maxx ||
y - my > maxy || y - my < -maxy)
continue;
// We have to calculate distances in pixels, not in
// data units, because the scales of the axes may be different
var dx = Math.abs(axisx.p2c(x) - mouseX),
dy = Math.abs(axisy.p2c(y) - mouseY),
dist = dx * dx + dy * dy; // we save the sqrt
// use <= to ensure last point takes precedence
// (last generally means on top of)
if (dist < smallestDistance) {
smallestDistance = dist;
item = [i, j / ps];
}
}
}
if (s.bars.show && !item) { // no other point can be nearby
var barLeft, barRight;
switch (s.bars.align) {
case "left":
barLeft = 0;
break;
case "right":
barLeft = -s.bars.barWidth;
break;
default:
barLeft = -s.bars.barWidth / 2;
}
barRight = barLeft + s.bars.barWidth;
for (j = 0; j < points.length; j += ps) {
var x = points[j], y = points[j + 1], b = points[j + 2];
if (x == null)
continue;
// for a bar graph, the cursor must be inside the bar
if (series[i].bars.horizontal ?
(mx <= Math.max(b, x) && mx >= Math.min(b, x) &&
my >= y + barLeft && my <= y + barRight) :
(mx >= x + barLeft && mx <= x + barRight &&
my >= Math.min(b, y) && my <= Math.max(b, y)))
item = [i, j / ps];
}
}
}
if (item) {
i = item[0];
j = item[1];
ps = series[i].datapoints.pointsize;
return { datapoint: series[i].datapoints.points.slice(j * ps, (j + 1) * ps),
dataIndex: j,
series: series[i],
seriesIndex: i };
}
return null;
}
function onMouseMove(e) {
if (options.grid.hoverable)
triggerClickHoverEvent("plothover", e,
function (s) { return s["hoverable"] != false; });
}
function onMouseLeave(e) {
if (options.grid.hoverable)
triggerClickHoverEvent("plothover", e,
function (s) { return false; });
}
function onClick(e) {
triggerClickHoverEvent("plotclick", e,
function (s) { return s["clickable"] != false; });
}
// trigger click or hover event (they send the same parameters
// so we share their code)
function triggerClickHoverEvent(eventname, event, seriesFilter) {
var offset = eventHolder.offset(),
canvasX = event.pageX - offset.left - plotOffset.left,
canvasY = event.pageY - offset.top - plotOffset.top,
pos = canvasToAxisCoords({ left: canvasX, top: canvasY });
pos.pageX = event.pageX;
pos.pageY = event.pageY;
var item = findNearbyItem(canvasX, canvasY, seriesFilter);
if (item) {
// fill in mouse pos for any listeners out there
item.pageX = parseInt(item.series.xaxis.p2c(item.datapoint[0]) + offset.left + plotOffset.left, 10);
item.pageY = parseInt(item.series.yaxis.p2c(item.datapoint[1]) + offset.top + plotOffset.top, 10);
}
if (options.grid.autoHighlight) {
// clear auto-highlights
for (var i = 0; i < highlights.length; ++i) {
var h = highlights[i];
if (h.auto == eventname &&
!(item && h.series == item.series &&
h.point[0] == item.datapoint[0] &&
h.point[1] == item.datapoint[1]))
unhighlight(h.series, h.point);
}
if (item)
highlight(item.series, item.datapoint, eventname);
}
placeholder.trigger(eventname, [ pos, item ]);
}
function triggerRedrawOverlay() {
var t = options.interaction.redrawOverlayInterval;
if (t == -1) { // skip event queue
drawOverlay();
return;
}
if (!redrawTimeout)
redrawTimeout = setTimeout(drawOverlay, t);
}
function drawOverlay() {
redrawTimeout = null;
// draw highlights
octx.save();
overlay.clear();
octx.translate(plotOffset.left, plotOffset.top);
var i, hi;
for (i = 0; i < highlights.length; ++i) {
hi = highlights[i];
if (hi.series.bars.show)
drawBarHighlight(hi.series, hi.point);
else
drawPointHighlight(hi.series, hi.point);
}
octx.restore();
executeHooks(hooks.drawOverlay, [octx]);
}
function highlight(s, point, auto) {
if (typeof s == "number")
s = series[s];
if (typeof point == "number") {
var ps = s.datapoints.pointsize;
point = s.datapoints.points.slice(ps * point, ps * (point + 1));
}
var i = indexOfHighlight(s, point);
if (i == -1) {
highlights.push({ series: s, point: point, auto: auto });
triggerRedrawOverlay();
}
else if (!auto)
highlights[i].auto = false;
}
function unhighlight(s, point) {
if (s == null && point == null) {
highlights = [];
triggerRedrawOverlay();
return;
}
if (typeof s == "number")
s = series[s];
if (typeof point == "number") {
var ps = s.datapoints.pointsize;
point = s.datapoints.points.slice(ps * point, ps * (point + 1));
}
var i = indexOfHighlight(s, point);
if (i != -1) {
highlights.splice(i, 1);
triggerRedrawOverlay();
}
}
function indexOfHighlight(s, p) {
for (var i = 0; i < highlights.length; ++i) {
var h = highlights[i];
if (h.series == s && h.point[0] == p[0]
&& h.point[1] == p[1])
return i;
}
return -1;
}
function drawPointHighlight(series, point) {
var x = point[0], y = point[1],
axisx = series.xaxis, axisy = series.yaxis,
highlightColor = (typeof series.highlightColor === "string") ? series.highlightColor : $.color.parse(series.color).scale('a', 0.5).toString();
if (x < axisx.min || x > axisx.max || y < axisy.min || y > axisy.max)
return;
var pointRadius = series.points.radius + series.points.lineWidth / 2;
octx.lineWidth = pointRadius;
octx.strokeStyle = highlightColor;
var radius = 1.5 * pointRadius;
x = axisx.p2c(x);
y = axisy.p2c(y);
octx.beginPath();
if (series.points.symbol == "circle")
octx.arc(x, y, radius, 0, 2 * Math.PI, false);
else
series.points.symbol(octx, x, y, radius, false);
octx.closePath();
octx.stroke();
}
function drawBarHighlight(series, point) {
var highlightColor = (typeof series.highlightColor === "string") ? series.highlightColor : $.color.parse(series.color).scale('a', 0.5).toString(),
fillStyle = highlightColor,
barLeft;
switch (series.bars.align) {
case "left":
barLeft = 0;
break;
case "right":
barLeft = -series.bars.barWidth;
break;
default:
barLeft = -series.bars.barWidth / 2;
}
octx.lineWidth = series.bars.lineWidth;
octx.strokeStyle = highlightColor;
drawBar(point[0], point[1], point[2] || 0, barLeft, barLeft + series.bars.barWidth,
function () { return fillStyle; }, series.xaxis, series.yaxis, octx, series.bars.horizontal, series.bars.lineWidth);
}
function getColorOrGradient(spec, bottom, top, defaultColor) {
if (typeof spec == "string")
return spec;
else {
// assume this is a gradient spec; IE currently only
// supports a simple vertical gradient properly, so that's
// what we support too
var gradient = ctx.createLinearGradient(0, top, 0, bottom);
for (var i = 0, l = spec.colors.length; i < l; ++i) {
var c = spec.colors[i];
if (typeof c != "string") {
var co = $.color.parse(defaultColor);
if (c.brightness != null)
co = co.scale('rgb', c.brightness);
if (c.opacity != null)
co.a *= c.opacity;
c = co.toString();
}
gradient.addColorStop(i / (l - 1), c);
}
return gradient;
}
}
}
// Add the plot function to the top level of the jQuery object
$.plot = function(placeholder, data, options) {
//var t0 = new Date();
var plot = new Plot($(placeholder), data, options, $.plot.plugins);
//(window.console ? console.log : alert)("time used (msecs): " + ((new Date()).getTime() - t0.getTime()));
return plot;
};
$.plot.version = "0.8.2-alpha";
$.plot.plugins = [];
// Also add the plot function as a chainable property
$.fn.plot = function(data, options) {
return this.each(function() {
$.plot(this, data, options);
});
};
// round to nearby lower multiple of base
function floorInBase(n, base) {
return base * Math.floor(n / base);
}
})(jQuery);
