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Copy pathjquery.flot.js
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jquery.flot.js
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/*! Javascript plotting library for jQuery, v. 0.7.
*
* Released under the MIT license by IOLA, December 2007.
*
*/
// 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 ($) {
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: ["#ed3f3f", "#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
},
xaxis: {
show: null, // null = auto-detect, true = always, false = never
position: "bottom", // or "top"
mode: null, // null or "time"
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
// mode specific options
tickDecimals: null, // no. of decimals, null means auto
tickSize: null, // number or [number, "unit"]
minTickSize: null, // number or [number, "unit"]
monthNames: null, // list of names of months
timeformat: null, // format string to use
twelveHourClock: false // 12 or 24 time in time mode
},
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
},
bars: {
show: false,
lineWidth: 2, // in pixels
barWidth: 1, // in units of the x axis
fill: true,
fillColor: null,
align: "left", // or "center"
horizontal: false
},
shadowSize: 3
},
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)"
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
},
hooks: {}
},
canvas = 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},
canvasWidth = 0, canvasHeight = 0,
plotWidth = 0, plotHeight = 0,
hooks = {
processOptions: [],
processRawData: [],
processDatapoints: [],
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 canvas;
};
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),
top: parseInt(yaxes[axisNumber(point, "y") - 1].p2c(+point.y) + plotOffset.top)
};
};
plot.shutdown = shutdown;
plot.resize = function () {
getCanvasDimensions();
resizeCanvas(canvas);
resizeCanvas(overlay);
};
// 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() {
for (var i = 0; i < plugins.length; ++i) {
var p = plugins[i];
p.init(plot);
if (p.options)
$.extend(true, options, p.options);
}
}
function parseOptions(opts) {
var i;
$.extend(true, options, opts);
if (options.xaxis.color == null)
options.xaxis.color = options.grid.color;
if (options.yaxis.color == null)
options.yaxis.color = options.grid.color;
if (options.xaxis.tickColor == null) // backwards-compatibility
options.xaxis.tickColor = options.grid.tickColor;
if (options.yaxis.tickColor == null) // backwards-compatibility
options.yaxis.tickColor = options.grid.tickColor;
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 in axes, copy at least always the
// first as the rest of the code assumes it'll be there
for (i = 0; i < Math.max(1, options.xaxes.length); ++i)
options.xaxes[i] = $.extend(true, {}, options.xaxis, options.xaxes[i]);
for (i = 0; i < Math.max(1, options.yaxes.length); ++i)
options.yaxes[i] = $.extend(true, {}, options.yaxis, options.yaxes[i]);
// 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;
// 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: $.extend(true, {}, axes == xaxes ? options.xaxis : options.yaxis)
};
return axes[number - 1];
}
function fillInSeriesOptions() {
var i;
// collect what we already got of colors
var neededColors = series.length,
usedColors = [],
assignedColors = [];
for (i = 0; i < series.length; ++i) {
var sc = series[i].color;
if (sc != null) {
--neededColors;
if (typeof sc == "number")
assignedColors.push(sc);
else
usedColors.push($.color.parse(series[i].color));
}
}
// we might need to generate more colors if higher indices
// are assigned
for (i = 0; i < assignedColors.length; ++i) {
neededColors = Math.max(neededColors, assignedColors[i] + 1);
}
// produce colors as needed
var colors = [], variation = 0;
i = 0;
while (colors.length < neededColors) {
var c;
if (options.colors.length == i) // check degenerate case
c = $.color.make(100, 100, 100);
else
c = $.color.parse(options.colors[i]);
// vary color if needed
var sign = variation % 2 == 1 ? -1 : 1;
c.scale('rgb', 1 + sign * Math.ceil(variation / 2) * 0.2);
// FIXME: if we're getting to close to something else,
// we should probably skip this one
colors.push(c);
++i;
if (i >= options.colors.length) {
i = 0;
++variation;
}
}
// fill in the options
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;
}
// 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;
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];
var 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)) {
format.push({y: true, number: true, required: false, defaultValue: 0});
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;
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.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;
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 || 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 = s.bars.align == "left" ? 0 : -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 makeCanvas(skipPositioning, cls) {
var c = document.createElement('canvas');
c.className = cls;
c.width = canvasWidth;
c.height = canvasHeight;
if (!skipPositioning)
$(c).css({position: 'absolute', left: 0, top: 0});
$(c).appendTo(placeholder);
if (!c.getContext) // excanvas hack
c = window.G_vmlCanvasManager.initElement(c);
// used for resetting in case we get replotted
c.getContext("2d").save();
return c;
}
function getCanvasDimensions() {
canvasWidth = placeholder.width();
canvasHeight = placeholder.height();
if (canvasWidth <= 0 || canvasHeight <= 0)
throw "Invalid dimensions for plot, width = " + canvasWidth + ", height = " + canvasHeight;
}
function resizeCanvas(c) {
// resizing should reset the state (excanvas seems to be
// buggy though)
if (c.width != canvasWidth)
c.width = canvasWidth;
if (c.height != canvasHeight)
c.height = canvasHeight;
// so try to get back to the initial state (even if it's
// gone now, this should be safe according to the spec)
var cctx = c.getContext("2d");
cctx.restore();
// and save again
cctx.save();
}
function setupCanvases() {
var reused,
existingCanvas = placeholder.children("canvas.base"),
existingOverlay = placeholder.children("canvas.overlay");
if (existingCanvas.length == 0 || existingOverlay == 0) {
// init everything
placeholder.html(""); // make sure placeholder is clear
placeholder.css({padding: 0}); // padding messes up the positioning
if (placeholder.css("position") == 'static')
placeholder.css("position", "relative"); // for positioning labels and overlay
getCanvasDimensions();
canvas = makeCanvas(true, "base");
overlay = makeCanvas(false, "overlay"); // overlay canvas for interactive features
reused = false;
}
else {
// reuse existing elements
canvas = existingCanvas.get(0);
overlay = existingOverlay.get(0);
reused = true;
}
ctx = canvas.getContext("2d");
octx = overlay.getContext("2d");
// we include the canvas in the event holder too, because IE 7
// sometimes has trouble with the stacking order
eventHolder = $([overlay, canvas]);
if (reused) {
// run shutdown in the old plot object
placeholder.data("plot").shutdown();
// reset reused canvases
plot.resize();
// make sure overlay pixels are cleared (canvas is cleared when we redraw)
octx.clearRect(0, 0, canvasWidth, canvasHeight);
// then whack any remaining obvious garbage left
eventHolder.unbind();
placeholder.children().not([canvas, overlay]).remove();
}
// save in case we get replotted
placeholder.data("plot", plot);
}
function bindEvents() {
// bind events
if (options.grid.hoverable) {
eventHolder.mousemove(onMouseMove);
eventHolder.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