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jquery.flot.js
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jquery.flot.js
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/* Javascript plotting library for jQuery, v. 0.6.
*
* 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 1.0.
*
* 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() work in-place instead of returning
* new objects.
*/
(function(){jQuery.color={};jQuery.color.make=function(E,D,B,C){var F={};F.r=E||0;F.g=D||0;F.b=B||0;F.a=C!=null?C:1;F.add=function(I,H){for(var G=0;G<I.length;++G){F[I.charAt(G)]+=H}return F.normalize()};F.scale=function(I,H){for(var G=0;G<I.length;++G){F[I.charAt(G)]*=H}return F.normalize()};F.toString=function(){if(F.a>=1){return"rgb("+[F.r,F.g,F.b].join(",")+")"}else{return"rgba("+[F.r,F.g,F.b,F.a].join(",")+")"}};F.normalize=function(){function G(I,J,H){return J<I?I:(J>H?H:J)}F.r=G(0,parseInt(F.r),255);F.g=G(0,parseInt(F.g),255);F.b=G(0,parseInt(F.b),255);F.a=G(0,F.a,1);return F};F.clone=function(){return jQuery.color.make(F.r,F.b,F.g,F.a)};return F.normalize()};jQuery.color.extract=function(C,B){var D;do{D=C.css(B).toLowerCase();if(D!=""&&D!="transparent"){break}C=C.parent()}while(!jQuery.nodeName(C.get(0),"body"));if(D=="rgba(0, 0, 0, 0)"){D="transparent"}return jQuery.color.parse(D)};jQuery.color.parse=function(E){var D,B=jQuery.color.make;if(D=/rgb\(\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*,\s*([0-9]{1,3})\s*\)/.exec(E)){return B(parseInt(D[1],10),parseInt(D[2],10),parseInt(D[3],10))}if(D=/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(E)){return B(parseInt(D[1],10),parseInt(D[2],10),parseInt(D[3],10),parseFloat(D[4]))}if(D=/rgb\(\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*,\s*([0-9]+(?:\.[0-9]+)?)\%\s*\)/.exec(E)){return B(parseFloat(D[1])*2.55,parseFloat(D[2])*2.55,parseFloat(D[3])*2.55)}if(D=/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(E)){return B(parseFloat(D[1])*2.55,parseFloat(D[2])*2.55,parseFloat(D[3])*2.55,parseFloat(D[4]))}if(D=/#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/.exec(E)){return B(parseInt(D[1],16),parseInt(D[2],16),parseInt(D[3],16))}if(D=/#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/.exec(E)){return B(parseInt(D[1]+D[1],16),parseInt(D[2]+D[2],16),parseInt(D[3]+D[3],16))}var C=jQuery.trim(E).toLowerCase();if(C=="transparent"){return B(255,255,255,0)}else{D=A[C];return B(D[0],D[1],D[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]}})();
// 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: ["#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
},
xaxis: {
mode: null, // null or "time"
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,
// 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
},
x2axis: {
autoscaleMargin: null
},
y2axis: {
autoscaleMargin: 0.02
},
series: {
points: {
show: false,
radius: 3,
lineWidth: 2, // in pixels
fill: true,
fillColor: "#ffffff"
},
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 // when horizontal, left is now top
},
shadowSize: 3
},
grid: {
show: true,
aboveData: false,
color: "#545454", // primary color used for outline and labels
backgroundColor: null, // null for transparent, else color
tickColor: "rgba(0,0,0,0.15)", // color used for the ticks
labelMargin: 5, // in pixels
borderWidth: 2, // in pixels
borderColor: null, // set if different from the grid color
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,
axes = { xaxis: {}, yaxis: {}, x2axis: {}, y2axis: {} },
plotOffset = { left: 0, right: 0, top: 0, bottom: 0},
canvasWidth = 0, canvasHeight = 0,
plotWidth = 0, plotHeight = 0,
hooks = {
processOptions: [],
processRawData: [],
processDatapoints: [],
draw: [],
bindEvents: [],
drawOverlay: []
},
plot = this;
// public functions
plot.setData = setData;
plot.setupGrid = setupGrid;
plot.draw = draw;
plot.drawSeries = drawSeries;
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() { return axes; };
plot.getOptions = function() { return options; };
plot.highlight = highlight;
plot.unhighlight = unhighlight;
plot.triggerRedrawOverlay = triggerRedrawOverlay;
plot.drawOverlay = drawOverlay;
plot.pointOffset = function(point) {
return { left: parseInt(axisSpecToRealAxis(point, "xaxis").p2c(+point.x) + plotOffset.left),
top: parseInt(axisSpecToRealAxis(point, "yaxis").p2c(+point.y) + plotOffset.top) };
};
// public attributes
plot.hooks = hooks;
// initialize
initPlugins(plot);
parseOptions(options_);
constructCanvas();
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) {
$.extend(true, options, opts);
if (options.grid.borderColor == null)
options.grid.borderColor = options.grid.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.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)
options.series.shadowSize = options.shadowSize;
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) {
s.data = d[i].data; // move the data instead of deep-copy
delete d[i].data;
$.extend(true, s, d[i]);
d[i].data = s.data;
}
else
s.data = d[i];
res.push(s);
}
return res;
}
function axisSpecToRealAxis(obj, attr) {
var a = obj[attr];
if (!a || a == 1)
return axes[attr];
if (typeof a == "number")
return axes[attr.charAt(0) + a + attr.slice(1)];
return a; // assume it's OK
}
function fillInSeriesOptions() {
var i;
// collect what we already got of colors
var neededColors = series.length,
usedColors = [],
assignedColors = [];
for (i = 0; i < series.length; ++i) {
var sc = series[i].color;
if (sc != null) {
--neededColors;
if (typeof sc == "number")
assignedColors.push(sc);
else
usedColors.push($.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].show) {
show = false;
break;
}
if (show)
s.lines.show = true;
}
// setup axes
s.xaxis = axisSpecToRealAxis(s, "xaxis");
s.yaxis = axisSpecToRealAxis(s, "yaxis");
}
}
function processData() {
var topSentry = Number.POSITIVE_INFINITY,
bottomSentry = Number.NEGATIVE_INFINITY,
i, j, k, m, length,
s, points, ps, x, y, axis, val, f, p;
for (axis in axes) {
axes[axis].datamin = topSentry;
axes[axis].datamax = bottomSentry;
axes[axis].used = false;
}
function updateAxis(axis, min, max) {
if (min < axis.datamin)
axis.datamin = min;
if (max > axis.datamax)
axis.datamax = max;
}
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)
format.push({ y: true, number: true, required: false, defaultValue: 0 });
s.datapoints.format = format;
}
if (s.datapoints.pointsize != null)
continue; // already filled in
if (s.datapoints.pointsize == null)
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;
}
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)
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);
}
for (axis in axes) {
if (axes[axis].datamin == topSentry)
axes[axis].datamin = null;
if (axes[axis].datamax == bottomSentry)
axes[axis].datamax = null;
}
}
function constructCanvas() {
function makeCanvas(width, height) {
var c = document.createElement('canvas');
c.width = width;
c.height = height;
if ($.browser.msie) // excanvas hack
c = window.G_vmlCanvasManager.initElement(c);
return c;
}
canvasWidth = placeholder.width();
canvasHeight = placeholder.height();
placeholder.html(""); // clear placeholder
if (placeholder.css("position") == 'static')
placeholder.css("position", "relative"); // for positioning labels and overlay
if (canvasWidth <= 0 || canvasHeight <= 0)
throw "Invalid dimensions for plot, width = " + canvasWidth + ", height = " + canvasHeight;
if ($.browser.msie) // excanvas hack
window.G_vmlCanvasManager.init_(document); // make sure everything is setup
// the canvas
canvas = $(makeCanvas(canvasWidth, canvasHeight)).appendTo(placeholder).get(0);
ctx = canvas.getContext("2d");
// overlay canvas for interactive features
overlay = $(makeCanvas(canvasWidth, canvasHeight)).css({ position: 'absolute', left: 0, top: 0 }).appendTo(placeholder).get(0);
octx = overlay.getContext("2d");
octx.stroke();
}
function bindEvents() {
// we include the canvas in the event holder too, because IE 7
// sometimes has trouble with the stacking order
eventHolder = $([overlay, canvas]);
// bind events
if (options.grid.hoverable)
eventHolder.mousemove(onMouseMove);
if (options.grid.clickable)
eventHolder.click(onClick);
executeHooks(hooks.bindEvents, [eventHolder]);
}
function setupGrid() {
function setTransformationHelpers(axis, o) {
function identity(x) { return x; }
var s, m, t = o.transform || identity,
it = o.inverseTransform;
// add transformation helpers
if (axis == axes.xaxis || axis == axes.x2axis) {
// precompute how much the axis is scaling a point
// in canvas space
s = axis.scale = plotWidth / (t(axis.max) - t(axis.min));
m = 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); };
}
else {
s = axis.scale = plotHeight / (t(axis.max) - t(axis.min));
m = t(axis.max);
if (t == identity)
axis.p2c = function (p) { return (m - p) * s; };
else
axis.p2c = function (p) { return (m - t(p)) * s; };
if (!it)
axis.c2p = function (c) { return m - c / s; };
else
axis.c2p = function (c) { return it(m - c / s); };
}
}
function measureLabels(axis, axisOptions) {
var i, labels = [], l;
axis.labelWidth = axisOptions.labelWidth;
axis.labelHeight = axisOptions.labelHeight;
if (axis == axes.xaxis || axis == axes.x2axis) {
// to avoid measuring the widths of the labels, we
// construct fixed-size boxes and put the labels inside
// them, we don't need the exact figures and the
// fixed-size box content is easy to center
if (axis.labelWidth == null)
axis.labelWidth = canvasWidth / (axis.ticks.length > 0 ? axis.ticks.length : 1);
// measure x label heights
if (axis.labelHeight == null) {
labels = [];
for (i = 0; i < axis.ticks.length; ++i) {
l = axis.ticks[i].label;
if (l)
labels.push('<div class="tickLabel" style="float:left;width:' + axis.labelWidth + 'px">' + l + '</div>');
}
if (labels.length > 0) {
var dummyDiv = $('<div style="position:absolute;top:-10000px;width:10000px;font-size:smaller">'
+ labels.join("") + '<div style="clear:left"></div></div>').appendTo(placeholder);
axis.labelHeight = dummyDiv.height();
dummyDiv.remove();
}
}
}
else if (axis.labelWidth == null || axis.labelHeight == null) {
// calculate y label dimensions
for (i = 0; i < axis.ticks.length; ++i) {
l = axis.ticks[i].label;
if (l)
labels.push('<div class="tickLabel">' + l + '</div>');
}
if (labels.length > 0) {
var dummyDiv = $('<div style="position:absolute;top:-10000px;font-size:smaller">'
+ labels.join("") + '</div>').appendTo(placeholder);
if (axis.labelWidth == null)
axis.labelWidth = dummyDiv.width();
if (axis.labelHeight == null)
axis.labelHeight = dummyDiv.find("div").height();
dummyDiv.remove();
}
}
if (axis.labelWidth == null)
axis.labelWidth = 0;
if (axis.labelHeight == null)
axis.labelHeight = 0;
}
function setGridSpacing() {
// get the most space needed around the grid for things
// that may stick out
var maxOutset = options.grid.borderWidth;
for (i = 0; i < series.length; ++i)
maxOutset = Math.max(maxOutset, 2 * (series[i].points.radius + series[i].points.lineWidth/2));
plotOffset.left = plotOffset.right = plotOffset.top = plotOffset.bottom = maxOutset;
var margin = options.grid.labelMargin + options.grid.borderWidth;
if (axes.xaxis.labelHeight > 0)
plotOffset.bottom = Math.max(maxOutset, axes.xaxis.labelHeight + margin);
if (axes.yaxis.labelWidth > 0)
plotOffset.left = Math.max(maxOutset, axes.yaxis.labelWidth + margin);
if (axes.x2axis.labelHeight > 0)
plotOffset.top = Math.max(maxOutset, axes.x2axis.labelHeight + margin);
if (axes.y2axis.labelWidth > 0)
plotOffset.right = Math.max(maxOutset, axes.y2axis.labelWidth + margin);
plotWidth = canvasWidth - plotOffset.left - plotOffset.right;
plotHeight = canvasHeight - plotOffset.bottom - plotOffset.top;
}
var axis;
for (axis in axes)
setRange(axes[axis], options[axis]);
if (options.grid.show) {
for (axis in axes) {
prepareTickGeneration(axes[axis], options[axis]);
setTicks(axes[axis], options[axis]);
measureLabels(axes[axis], options[axis]);
}
setGridSpacing();
}
else {
plotOffset.left = plotOffset.right = plotOffset.top = plotOffset.bottom = 0;
plotWidth = canvasWidth;
plotHeight = canvasHeight;
}
for (axis in axes)
setTransformationHelpers(axes[axis], options[axis]);
if (options.grid.show)
insertLabels();
insertLegend();
}
function setRange(axis, axisOptions) {
var min = +(axisOptions.min != null ? axisOptions.min : axis.datamin),
max = +(axisOptions.max != null ? axisOptions.max : axis.datamax),
delta = max - min;
if (delta == 0.0) {
// degenerate case
var widen = max == 0 ? 1 : 0.01;
if (axisOptions.min == null)
min -= widen;
// alway widen max if we couldn't widen min to ensure we
// don't fall into min == max which doesn't work
if (axisOptions.max == null || axisOptions.min != null)
max += widen;
}
else {
// consider autoscaling
var margin = axisOptions.autoscaleMargin;
if (margin != null) {
if (axisOptions.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 (axisOptions.max == null) {
max += delta * margin;
if (max > 0 && axis.datamax != null && axis.datamax <= 0)
max = 0;
}
}
}
axis.min = min;
axis.max = max;
}
function prepareTickGeneration(axis, axisOptions) {
// estimate number of ticks
var noTicks;
if (typeof axisOptions.ticks == "number" && axisOptions.ticks > 0)
noTicks = axisOptions.ticks;
else if (axis == axes.xaxis || axis == axes.x2axis)
// heuristic based on the model a*sqrt(x) fitted to
// some reasonable data points
noTicks = 0.3 * Math.sqrt(canvasWidth);
else
noTicks = 0.3 * Math.sqrt(canvasHeight);
var delta = (axis.max - axis.min) / noTicks,
size, generator, unit, formatter, i, magn, norm;
if (axisOptions.mode == "time") {
// pretty handling of time
// map of app. size of time units in milliseconds
var timeUnitSize = {
"second": 1000,
"minute": 60 * 1000,
"hour": 60 * 60 * 1000,
"day": 24 * 60 * 60 * 1000,
"month": 30 * 24 * 60 * 60 * 1000,
"year": 365.2425 * 24 * 60 * 60 * 1000
};
// the allowed tick sizes, after 1 year we use
// an integer algorithm
var spec = [
[1, "second"], [2, "second"], [5, "second"], [10, "second"],
[30, "second"],
[1, "minute"], [2, "minute"], [5, "minute"], [10, "minute"],
[30, "minute"],
[1, "hour"], [2, "hour"], [4, "hour"],
[8, "hour"], [12, "hour"],
[1, "day"], [2, "day"], [3, "day"],
[0.25, "month"], [0.5, "month"], [1, "month"],
[2, "month"], [3, "month"], [6, "month"],
[1, "year"]
];
var minSize = 0;
if (axisOptions.minTickSize != null) {
if (typeof axisOptions.tickSize == "number")
minSize = axisOptions.tickSize;
else
minSize = axisOptions.minTickSize[0] * timeUnitSize[axisOptions.minTickSize[1]];
}
for (i = 0; i < spec.length - 1; ++i)
if (delta < (spec[i][0] * timeUnitSize[spec[i][1]]
+ spec[i + 1][0] * timeUnitSize[spec[i + 1][1]]) / 2
&& spec[i][0] * timeUnitSize[spec[i][1]] >= minSize)
break;
size = spec[i][0];
unit = spec[i][1];
// special-case the possibility of several years
if (unit == "year") {
magn = Math.pow(10, Math.floor(Math.log(delta / timeUnitSize.year) / Math.LN10));
norm = (delta / timeUnitSize.year) / magn;
if (norm < 1.5)
size = 1;
else if (norm < 3)
size = 2;
else if (norm < 7.5)
size = 5;
else
size = 10;
size *= magn;
}
if (axisOptions.tickSize) {
size = axisOptions.tickSize[0];
unit = axisOptions.tickSize[1];
}
generator = function(axis) {
var ticks = [],
tickSize = axis.tickSize[0], unit = axis.tickSize[1],
d = new Date(axis.min);
var step = tickSize * timeUnitSize[unit];
if (unit == "second")
d.setUTCSeconds(floorInBase(d.getUTCSeconds(), tickSize));
if (unit == "minute")
d.setUTCMinutes(floorInBase(d.getUTCMinutes(), tickSize));
if (unit == "hour")
d.setUTCHours(floorInBase(d.getUTCHours(), tickSize));
if (unit == "month")
d.setUTCMonth(floorInBase(d.getUTCMonth(), tickSize));
if (unit == "year")
d.setUTCFullYear(floorInBase(d.getUTCFullYear(), tickSize));
// reset smaller components
d.setUTCMilliseconds(0);
if (step >= timeUnitSize.minute)
d.setUTCSeconds(0);
if (step >= timeUnitSize.hour)
d.setUTCMinutes(0);
if (step >= timeUnitSize.day)
d.setUTCHours(0);
if (step >= timeUnitSize.day * 4)
d.setUTCDate(1);
if (step >= timeUnitSize.year)
d.setUTCMonth(0);
var carry = 0, v = Number.NaN, prev;
do {
prev = v;
v = d.getTime();
ticks.push({ v: v, label: axis.tickFormatter(v, axis) });
if (unit == "month") {
if (tickSize < 1) {
// a bit complicated - we'll divide the month
// up but we need to take care of fractions
// so we don't end up in the middle of a day
d.setUTCDate(1);
var start = d.getTime();
d.setUTCMonth(d.getUTCMonth() + 1);
var end = d.getTime();
d.setTime(v + carry * timeUnitSize.hour + (end - start) * tickSize);
carry = d.getUTCHours();
d.setUTCHours(0);
}
else
d.setUTCMonth(d.getUTCMonth() + tickSize);
}
else if (unit == "year") {
d.setUTCFullYear(d.getUTCFullYear() + tickSize);
}
else
d.setTime(v + step);
} while (v < axis.max && v != prev);
return ticks;
};
formatter = function (v, axis) {
var d = new Date(v);
// first check global format
if (axisOptions.timeformat != null)
return $.plot.formatDate(d, axisOptions.timeformat, axisOptions.monthNames);
var t = axis.tickSize[0] * timeUnitSize[axis.tickSize[1]];
var span = axis.max - axis.min;
var suffix = (axisOptions.twelveHourClock) ? " %p" : "";
if (t < timeUnitSize.minute)
fmt = "%h:%M:%S" + suffix;
else if (t < timeUnitSize.day) {
if (span < 2 * timeUnitSize.day)
fmt = "%h:%M" + suffix;
else
fmt = "%b %d %h:%M" + suffix;
}
else if (t < timeUnitSize.month)
fmt = "%b %d";
else if (t < timeUnitSize.year) {
if (span < timeUnitSize.year)
fmt = "%b";
else
fmt = "%b %y";
}
else
fmt = "%y";
return $.plot.formatDate(d, fmt, axisOptions.monthNames);
};
}
else {
// pretty rounding of base-10 numbers
var maxDec = axisOptions.tickDecimals;
var dec = -Math.floor(Math.log(delta) / Math.LN10);
if (maxDec != null && dec > maxDec)
dec = maxDec;
magn = Math.pow(10, -dec);
norm = delta / magn; // norm is between 1.0 and 10.0
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 (axisOptions.minTickSize != null && size < axisOptions.minTickSize)
size = axisOptions.minTickSize;
if (axisOptions.tickSize != null)
size = axisOptions.tickSize;
axis.tickDecimals = Math.max(0, (maxDec != null) ? maxDec : dec);
generator = function (axis) {
var ticks = [];
// spew out all possible ticks
var start = floorInBase(axis.min, axis.tickSize),
i = 0, v = Number.NaN, prev;
do {
prev = v;
v = start + i * axis.tickSize;
ticks.push({ v: v, label: axis.tickFormatter(v, axis) });
++i;
} while (v < axis.max && v != prev);
return ticks;
};
formatter = function (v, axis) {
return v.toFixed(axis.tickDecimals);
};
}