3 * Pure JavaScript plotting plugin using jQuery
8 * Copyright (c) 2009-2012 Chris Leonello
9 * jqPlot is currently available for use in all personal or commercial projects
10 * under both the MIT (http://www.opensource.org/licenses/mit-license.php) and GPL
11 * version 2.0 (http://www.gnu.org/licenses/gpl-2.0.html) licenses. This means that you can
12 * choose the license that best suits your project and use it accordingly.
14 * Although not required, the author would appreciate an email letting him
15 * know of any substantial use of jqPlot. You can reach the author at:
16 * chris at jqplot dot com or see http://www.jqplot.com/info.php .
18 * If you are feeling kind and generous, consider supporting the project by
19 * making a donation at: http://www.jqplot.com/donate.php .
21 * sprintf functions contained in jqplot.sprintf.js by Ash Searle:
25 * http://hexmen.com/blog/2007/03/printf-sprintf/
26 * http://hexmen.com/js/sprintf.js
27 * The author (Ash Searle) has placed this code in the public domain:
28 * "This code is unrestricted: you are free to use it however you like."
34 * Class: $.jqplot.PointLabels
35 * Plugin for putting labels at the data points.
37 * To use this plugin, include the js
38 * file in your source:
40 * > <script type="text/javascript" src="plugins/jqplot.pointLabels.js"></script>
42 * By default, the last value in the data ponit array in the data series is used
43 * for the label. For most series renderers, extra data can be added to the
44 * data point arrays and the last value will be used as the label.
49 * > [[1,4], [3,5], [7,2]]
51 * Would, by default, use the y values in the labels.
52 * Extra data can be added to the series like so:
54 * > [[1,4,'mid'], [3 5,'hi'], [7,2,'low']]
56 * And now the point labels would be 'mid', 'low', and 'hi'.
58 * Options to the point labels and a custom labels array can be passed into the
59 * "pointLabels" option on the series option like so:
61 * > series:[{pointLabels:{
62 * > labels:['mid', 'hi', 'low'],
68 * A custom labels array in the options takes precendence over any labels
69 * in the series data. If you have a custom labels array in the options,
70 * but still want to use values from the series array as labels, set the
71 * "labelsFromSeries" option to true.
73 * By default, html entities (<, >, etc.) are escaped in point labels.
74 * If you want to include actual html markup in the labels,
75 * set the "escapeHTML" option to false.
78 $.jqplot.PointLabels = function(options) {
82 // show the labels or not.
83 this.show = $.jqplot.config.enablePlugins;
85 // compass location where to position the label around the point.
86 // 'n', 'ne', 'e', 'se', 's', 'sw', 'w', 'nw'
88 // prop: labelsFromSeries
89 // true to use labels within data point arrays.
90 this.labelsFromSeries = false;
91 // prop: seriesLabelIndex
92 // array index for location of labels within data point arrays.
93 // if null, will use the last element of the data point array.
94 this.seriesLabelIndex = null;
96 // array of arrays of labels, one array for each series.
98 // actual labels that will get displayed.
99 // needed to preserve user specified labels in labels array.
101 // prop: stackedValue
102 // true to display value as stacked in a stacked plot.
103 // no effect if labels is specified.
104 this.stackedValue = false;
106 // vertical padding in pixels between point and label
109 // horizontal padding in pixels between point and label
112 // true to escape html entities in the labels.
113 // If you want to include markup in the labels, set to false.
114 this.escapeHTML = true;
115 // prop: edgeTolerance
116 // Number of pixels that the label must be away from an axis
117 // boundary in order to be drawn. Negative values will allow overlap
118 // with the grid boundaries.
119 this.edgeTolerance = -5;
121 // A class of a formatter for the tick text. sprintf by default.
122 this.formatter = $.jqplot.DefaultTickFormatter;
123 // prop: formatString
124 // string passed to the formatter.
125 this.formatString = '';
127 // true to not show a label for a value which is 0.
128 this.hideZeros = false;
131 $.extend(true, this, options);
134 var locations = ['nw', 'n', 'ne', 'e', 'se', 's', 'sw', 'w'];
135 var locationIndicies = {'nw':0, 'n':1, 'ne':2, 'e':3, 'se':4, 's':5, 'sw':6, 'w':7};
136 var oppositeLocations = ['se', 's', 'sw', 'w', 'nw', 'n', 'ne', 'e'];
138 // called with scope of a series
139 $.jqplot.PointLabels.init = function (target, data, seriesDefaults, opts, plot){
140 var options = $.extend(true, {}, seriesDefaults, opts);
141 options.pointLabels = options.pointLabels || {};
142 if (this.renderer.constructor === $.jqplot.BarRenderer && this.barDirection === 'horizontal' && !options.pointLabels.location) {
143 options.pointLabels.location = 'e';
145 // add a pointLabels attribute to the series plugins
146 this.plugins.pointLabels = new $.jqplot.PointLabels(options.pointLabels);
147 this.plugins.pointLabels.setLabels.call(this);
150 // called with scope of series
151 $.jqplot.PointLabels.prototype.setLabels = function() {
152 var p = this.plugins.pointLabels;
154 if (p.seriesLabelIndex != null) {
155 labelIdx = p.seriesLabelIndex;
157 else if (this.renderer.constructor === $.jqplot.BarRenderer && this.barDirection === 'horizontal') {
161 labelIdx = (this._plotData.length === 0) ? 0 : this._plotData[0].length -1;
164 if (p.labels.length === 0 || p.labelsFromSeries) {
165 if (p.stackedValue) {
166 if (this._plotData.length && this._plotData[0].length){
167 // var idx = p.seriesLabelIndex || this._plotData[0].length -1;
168 for (var i=0; i<this._plotData.length; i++) {
169 p._labels.push(this._plotData[i][labelIdx]);
174 // var d = this._plotData;
176 if (this.renderer.constructor === $.jqplot.BarRenderer && this.waterfall) {
179 if (d.length && d[0].length) {
180 // var idx = p.seriesLabelIndex || d[0].length -1;
181 for (var i=0; i<d.length; i++) {
182 p._labels.push(d[i][labelIdx]);
188 else if (p.labels.length){
189 p._labels = p.labels;
193 $.jqplot.PointLabels.prototype.xOffset = function(elem, location, padding) {
194 location = location || this.location;
195 padding = padding || this.xpadding;
200 offset = -elem.outerWidth(true) - this.xpadding;
203 offset = -elem.outerWidth(true)/2;
206 offset = this.xpadding;
209 offset = this.xpadding;
212 offset = this.xpadding;
215 offset = -elem.outerWidth(true)/2;
218 offset = -elem.outerWidth(true) - this.xpadding;
221 offset = -elem.outerWidth(true) - this.xpadding;
223 default: // same as 'nw'
224 offset = -elem.outerWidth(true) - this.xpadding;
230 $.jqplot.PointLabels.prototype.yOffset = function(elem, location, padding) {
231 location = location || this.location;
232 padding = padding || this.xpadding;
237 offset = -elem.outerHeight(true) - this.ypadding;
240 offset = -elem.outerHeight(true) - this.ypadding;
243 offset = -elem.outerHeight(true) - this.ypadding;
246 offset = -elem.outerHeight(true)/2;
249 offset = this.ypadding;
252 offset = this.ypadding;
255 offset = this.ypadding;
258 offset = -elem.outerHeight(true)/2;
260 default: // same as 'nw'
261 offset = -elem.outerHeight(true) - this.ypadding;
267 // called with scope of series
268 $.jqplot.PointLabels.draw = function (sctx, options, plot) {
269 var p = this.plugins.pointLabels;
270 // set labels again in case they have changed.
271 p.setLabels.call(this);
272 // remove any previous labels
273 for (var i=0; i<p._elems.length; i++) {
274 // Memory Leaks patch
275 // p._elems[i].remove();
276 p._elems[i].emptyForce();
278 p._elems.splice(0, p._elems.length);
281 var ax = '_'+this._stackAxis+'axis';
283 if (!p.formatString) {
284 p.formatString = this[ax]._ticks[0].formatString;
285 p.formatter = this[ax]._ticks[0].formatter;
288 var pd = this._plotData;
289 var ppd = this._prevPlotData;
290 var xax = this._xaxis;
291 var yax = this._yaxis;
294 for (var i=0, l=p._labels.length; i < l; i++) {
295 var label = p._labels[i];
297 if (p.hideZeros && parseInt(p._labels[i], 10) == 0) {
302 label = p.formatter(p.formatString, label);
305 helem = document.createElement('div');
306 p._elems[i] = $(helem);
311 elem.addClass('jqplot-point-label jqplot-series-'+this.index+' jqplot-point-'+i);
312 elem.css('position', 'absolute');
313 elem.insertAfter(sctx.canvas);
321 var location = p.location;
322 if ((this.fillToZero && pd[i][1] < 0) || (this.fillToZero && this._type === 'bar' && this.barDirection === 'horizontal' && pd[i][0] < 0) || (this.waterfall && parseInt(label, 10)) < 0) {
323 location = oppositeLocations[locationIndicies[location]];
327 var ell = xax.u2p(pd[i][0]) + p.xOffset(elem, location);
328 var elt = yax.u2p(pd[i][1]) + p.yOffset(elem, location);
330 // we have stacked chart but are not showing stacked values,
331 // place labels in center.
332 if (this._stack && !p.stackedValue) {
333 if (this.barDirection === "vertical") {
334 elt = (this._barPoints[i][0][1] + this._barPoints[i][1][1]) / 2 + plot._gridPadding.top - 0.5 * elem.outerHeight(true);
337 ell = (this._barPoints[i][2][0] + this._barPoints[i][0][0]) / 2 + plot._gridPadding.left - 0.5 * elem.outerWidth(true);
341 if (this.renderer.constructor == $.jqplot.BarRenderer) {
342 if (this.barDirection == "vertical") {
343 ell += this._barNudge;
346 elt -= this._barNudge;
349 elem.css('left', ell);
350 elem.css('top', elt);
351 var elr = ell + elem.width();
352 var elb = elt + elem.height();
353 var et = p.edgeTolerance;
354 var scl = $(sctx.canvas).position().left;
355 var sct = $(sctx.canvas).position().top;
356 var scr = sctx.canvas.width + scl;
357 var scb = sctx.canvas.height + sct;
358 // if label is outside of allowed area, remove it
359 if (ell - et < scl || elt - et < sct || elr + et > scr || elb + et > scb) {
367 // finally, animate them if the series is animated
368 // if (this.renderer.animation && this.renderer.animation._supported && this.renderer.animation.show && plot._drawCount < 2) {
369 // var sel = '.jqplot-point-label.jqplot-series-'+this.index;
371 // $(sel).fadeIn(1000);
377 $.jqplot.postSeriesInitHooks.push($.jqplot.PointLabels.init);
378 $.jqplot.postDrawSeriesHooks.push($.jqplot.PointLabels.draw);