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450 lines
19 KiB
JavaScript
450 lines
19 KiB
JavaScript
/**
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* jqPlot
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* Pure JavaScript plotting plugin using jQuery
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*
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* Version: 1.0.0b2_r947
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*
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* Copyright (c) 2009-2011 Chris Leonello
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* jqPlot is currently available for use in all personal or commercial projects
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* under both the MIT (http://www.opensource.org/licenses/mit-license.php) and GPL
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* version 2.0 (http://www.gnu.org/licenses/gpl-2.0.html) licenses. This means that you can
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* choose the license that best suits your project and use it accordingly.
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*
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* Although not required, the author would appreciate an email letting him
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* know of any substantial use of jqPlot. You can reach the author at:
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* chris at jqplot dot com or see http://www.jqplot.com/info.php .
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*
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* If you are feeling kind and generous, consider supporting the project by
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* making a donation at: http://www.jqplot.com/donate.php .
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*
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* sprintf functions contained in jqplot.sprintf.js by Ash Searle:
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*
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* version 2007.04.27
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* author Ash Searle
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* http://hexmen.com/blog/2007/03/printf-sprintf/
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* http://hexmen.com/js/sprintf.js
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* The author (Ash Searle) has placed this code in the public domain:
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* "This code is unrestricted: you are free to use it however you like."
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*
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*/
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(function($) {
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/**
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* class: $.jqplot.LogAxisRenderer
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* A plugin for a jqPlot to render a logarithmic axis.
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*
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* To use this renderer, include the plugin in your source
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* > <script type="text/javascript" language="javascript" src="plugins/jqplot.logAxisRenderer.js"></script>
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*
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* and supply the appropriate options to your plot
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*
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* > {axes:{xaxis:{renderer:$.jqplot.LogAxisRenderer}}}
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**/
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$.jqplot.LogAxisRenderer = function() {
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$.jqplot.LinearAxisRenderer.call(this);
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// prop: axisDefaults
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// Default properties which will be applied directly to the series.
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//
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// Group: Properties
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//
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// Properties
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//
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/// base - the logarithmic base, commonly 2, 10 or Math.E
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// tickDistribution - 'even' or 'power'. 'even' gives equal pixel
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// spacing of the ticks on the plot. 'power' gives ticks in powers
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// of 10.
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this.axisDefaults = {
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base : 10,
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tickDistribution :'even'
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};
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};
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$.jqplot.LogAxisRenderer.prototype = new $.jqplot.LinearAxisRenderer();
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$.jqplot.LogAxisRenderer.prototype.constructor = $.jqplot.LogAxisRenderer;
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$.jqplot.LogAxisRenderer.prototype.init = function(options) {
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// prop: drawBaseline
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// True to draw the axis baseline.
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this.drawBaseline = true;
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$.extend(true, this.renderer, options);
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for (var d in this.renderer.axisDefaults) {
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if (this[d] == null) {
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this[d] = this.renderer.axisDefaults[d];
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}
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}
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var db = this._dataBounds;
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// Go through all the series attached to this axis and find
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// the min/max bounds for this axis.
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for (var i=0; i<this._series.length; i++) {
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var s = this._series[i];
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var d = s.data;
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for (var j=0; j<d.length; j++) {
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if (this.name == 'xaxis' || this.name == 'x2axis') {
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if ((d[j][0] != null && d[j][0] < db.min) || db.min == null) {
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db.min = d[j][0];
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}
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if ((d[j][0] != null && d[j][0] > db.max) || db.max == null) {
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db.max = d[j][0];
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}
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}
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else {
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if ((d[j][1] != null && d[j][1] < db.min) || db.min == null) {
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db.min = d[j][1];
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}
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if ((d[j][1] != null && d[j][1] > db.max) || db.max == null) {
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db.max = d[j][1];
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}
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}
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}
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}
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};
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$.jqplot.LogAxisRenderer.prototype.createTicks = function() {
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// we're are operating on an axis here
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var ticks = this._ticks;
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var userTicks = this.ticks;
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var name = this.name;
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var db = this._dataBounds;
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var dim, interval;
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var min, max;
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var pos1, pos2;
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var tt, i;
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// if we already have ticks, use them.
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// ticks must be in order of increasing value.
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if (userTicks.length) {
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// ticks could be 1D or 2D array of [val, val, ,,,] or [[val, label], [val, label], ...] or mixed
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for (i=0; i<userTicks.length; i++){
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var ut = userTicks[i];
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var t = new this.tickRenderer(this.tickOptions);
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if (ut.constructor == Array) {
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t.value = ut[0];
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t.label = ut[1];
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if (!this.showTicks) {
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t.showLabel = false;
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t.showMark = false;
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}
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else if (!this.showTickMarks) {
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t.showMark = false;
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}
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t.setTick(ut[0], this.name);
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this._ticks.push(t);
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}
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else if ($.isPlainObject(ut)) {
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$.extend(true, t, ut);
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t.axis = this.name;
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this._ticks.push(t);
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}
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else {
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t.value = ut;
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if (!this.showTicks) {
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t.showLabel = false;
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t.showMark = false;
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}
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else if (!this.showTickMarks) {
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t.showMark = false;
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}
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t.setTick(ut, this.name);
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this._ticks.push(t);
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}
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}
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this.numberTicks = userTicks.length;
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this.min = this._ticks[0].value;
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this.max = this._ticks[this.numberTicks-1].value;
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}
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// we don't have any ticks yet, let's make some!
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else {
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if (name == 'xaxis' || name == 'x2axis') {
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dim = this._plotDimensions.width;
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}
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else {
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dim = this._plotDimensions.height;
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}
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min = ((this.min != null) ? this.min : db.min);
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max = ((this.max != null) ? this.max : db.max);
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// if min and max are same, space them out a bit
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if (min == max) {
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var adj = 0.05;
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min = min*(1-adj);
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max = max*(1+adj);
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}
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// perform some checks
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if (this.min != null && this.min <= 0) {
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throw('log axis minimum must be greater than 0');
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}
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if (this.max != null && this.max <= 0) {
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throw('log axis maximum must be greater than 0');
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}
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// if (this.pad >1.99) this.pad = 1.99;
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var range = max - min;
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var rmin, rmax;
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if (this.tickDistribution == 'even') {
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rmin = (this.min != null) ? this.min : min - min*((this.padMin-1)/2);
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rmax = (this.max != null) ? this.max : max + max*((this.padMax-1)/2);
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this.min = rmin;
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this.max = rmax;
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range = this.max - this.min;
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if (this.numberTicks == null){
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if (dim > 100) {
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this.numberTicks = parseInt(3+(dim-100)/75, 10);
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}
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else {
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this.numberTicks = 2;
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}
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}
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var u = Math.pow(this.base, (1/(this.numberTicks-1)*Math.log(this.max/this.min)/Math.log(this.base)));
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for (var i=0; i<this.numberTicks; i++){
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tt = this.min * Math.pow(u, i);
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var t = new this.tickRenderer(this.tickOptions);
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if (!this.showTicks) {
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t.showLabel = false;
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t.showMark = false;
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}
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else if (!this.showTickMarks) {
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t.showMark = false;
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}
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t.setTick(tt, this.name);
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this._ticks.push(t);
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}
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}
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else if (this.tickDistribution == 'power'){
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// for power distribution, open up range to get a nice power of axis.renderer.base.
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// power distribution won't respect the user's min/max settings.
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rmin = Math.pow(this.base, Math.ceil(Math.log(min*(2-this.padMin))/Math.log(this.base))-1);
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rmax = Math.pow(this.base, Math.floor(Math.log(max*this.padMax)/Math.log(this.base))+1);
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this.min = rmin;
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this.max = rmax;
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range = this.max - this.min;
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var fittedTicks = 0;
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var minorTicks = 0;
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if (this.numberTicks == null){
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if (dim > 100) {
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this.numberTicks = Math.round(Math.log(this.max/this.min)/Math.log(this.base) + 1);
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if (this.numberTicks < 2) {
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this.numberTicks = 2;
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}
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fittedTicks = parseInt(3+(dim-100)/75, 10);
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}
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else {
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this.numberTicks = 2;
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fittedTicks = 2;
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}
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// if we don't have enough ticks, add some intermediate ticks
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// how many to have between major ticks.
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if (this.numberTicks < fittedTicks-1) {
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minorTicks = Math.floor(fittedTicks/this.numberTicks);
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}
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}
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for (var i=0; i<this.numberTicks; i++){
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tt = Math.pow(this.base, i - this.numberTicks + 1) * this.max;
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var t = new this.tickRenderer(this.tickOptions);
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if (!this.showTicks) {
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t.showLabel = false;
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t.showMark = false;
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}
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else if (!this.showTickMarks) {
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t.showMark = false;
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}
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t.setTick(tt, this.name);
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this._ticks.push(t);
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if (minorTicks && i<this.numberTicks-1) {
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var tt1 = Math.pow(this.base, i - this.numberTicks + 2) * this.max;
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var spread = tt1 - tt;
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var interval = tt1 / (minorTicks+1);
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for (var j=minorTicks-1; j>=0; j--) {
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var val = tt1-interval*(j+1);
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var t = new this.tickRenderer(this.tickOptions);
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if (!this.showTicks) {
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t.showLabel = false;
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t.showMark = false;
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}
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else if (!this.showTickMarks) {
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t.showMark = false;
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}
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t.setTick(val, this.name);
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this._ticks.push(t);
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}
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}
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}
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}
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}
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};
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$.jqplot.LogAxisRenderer.prototype.pack = function(pos, offsets) {
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var lb = parseInt(this.base, 10);
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var ticks = this._ticks;
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var trans = function (v) { return Math.log(v)/Math.log(lb); };
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var invtrans = function (v) { return Math.pow(Math.E, (Math.log(lb)*v)); };
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var max = trans(this.max);
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var min = trans(this.min);
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var offmax = offsets.max;
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var offmin = offsets.min;
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var lshow = (this._label == null) ? false : this._label.show;
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for (var p in pos) {
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this._elem.css(p, pos[p]);
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}
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this._offsets = offsets;
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// pixellength will be + for x axes and - for y axes becasue pixels always measured from top left.
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var pixellength = offmax - offmin;
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var unitlength = max - min;
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// point to unit and unit to point conversions references to Plot DOM element top left corner.
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this.p2u = function(p){
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return invtrans((p - offmin) * unitlength / pixellength + min);
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};
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this.u2p = function(u){
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return (trans(u) - min) * pixellength / unitlength + offmin;
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};
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if (this.name == 'xaxis' || this.name == 'x2axis'){
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this.series_u2p = function(u){
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return (trans(u) - min) * pixellength / unitlength;
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};
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this.series_p2u = function(p){
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return invtrans(p * unitlength / pixellength + min);
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};
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}
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// yaxis is max at top of canvas.
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else {
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this.series_u2p = function(u){
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return (trans(u) - max) * pixellength / unitlength;
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};
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this.series_p2u = function(p){
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return invtrans(p * unitlength / pixellength + max);
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};
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}
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if (this.show) {
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if (this.name == 'xaxis' || this.name == 'x2axis') {
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for (var i=0; i<ticks.length; i++) {
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var t = ticks[i];
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if (t.show && t.showLabel) {
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var shim;
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if (t.constructor == $.jqplot.CanvasAxisTickRenderer && t.angle) {
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switch (t.labelPosition) {
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case 'auto':
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// position at end
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if (t.angle < 0) {
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shim = -t.getWidth() + t._textRenderer.height * Math.sin(-t._textRenderer.angle) / 2;
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}
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// position at start
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else {
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shim = -t._textRenderer.height * Math.sin(t._textRenderer.angle) / 2;
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}
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break;
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case 'end':
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shim = -t.getWidth() + t._textRenderer.height * Math.sin(-t._textRenderer.angle) / 2;
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break;
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case 'start':
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shim = -t._textRenderer.height * Math.sin(t._textRenderer.angle) / 2;
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break;
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case 'middle':
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shim = -t.getWidth()/2 + t._textRenderer.height * Math.sin(-t._textRenderer.angle) / 2;
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break;
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default:
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shim = -t.getWidth()/2 + t._textRenderer.height * Math.sin(-t._textRenderer.angle) / 2;
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break;
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}
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}
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else {
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shim = -t.getWidth()/2;
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}
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// var shim = t.getWidth()/2;
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var val = this.u2p(t.value) + shim + 'px';
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t._elem.css('left', val);
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t.pack();
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}
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}
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if (lshow) {
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var w = this._label._elem.outerWidth(true);
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this._label._elem.css('left', offmin + pixellength/2 - w/2 + 'px');
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if (this.name == 'xaxis') {
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this._label._elem.css('bottom', '0px');
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}
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else {
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this._label._elem.css('top', '0px');
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}
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this._label.pack();
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}
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}
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else {
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for (var i=0; i<ticks.length; i++) {
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var t = ticks[i];
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if (t.show && t.showLabel) {
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var shim;
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if (t.constructor == $.jqplot.CanvasAxisTickRenderer && t.angle) {
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switch (t.labelPosition) {
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case 'auto':
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// position at end
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case 'end':
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if (t.angle < 0) {
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shim = -t._textRenderer.height * Math.cos(-t._textRenderer.angle) / 2;
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}
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else {
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shim = -t.getHeight() + t._textRenderer.height * Math.cos(t._textRenderer.angle) / 2;
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}
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break;
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case 'start':
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if (t.angle > 0) {
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shim = -t._textRenderer.height * Math.cos(-t._textRenderer.angle) / 2;
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}
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else {
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shim = -t.getHeight() + t._textRenderer.height * Math.cos(t._textRenderer.angle) / 2;
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}
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break;
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case 'middle':
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// if (t.angle > 0) {
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// shim = -t.getHeight()/2 + t._textRenderer.height * Math.sin(-t._textRenderer.angle) / 2;
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// }
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// else {
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// shim = -t.getHeight()/2 - t._textRenderer.height * Math.sin(t._textRenderer.angle) / 2;
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// }
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shim = -t.getHeight()/2;
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break;
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default:
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shim = -t.getHeight()/2;
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break;
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}
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}
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else {
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shim = -t.getHeight()/2;
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}
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var val = this.u2p(t.value) + shim + 'px';
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t._elem.css('top', val);
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t.pack();
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}
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}
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if (lshow) {
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var h = this._label._elem.outerHeight(true);
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this._label._elem.css('top', offmax - pixellength/2 - h/2 + 'px');
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if (this.name == 'yaxis') {
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this._label._elem.css('left', '0px');
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}
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else {
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this._label._elem.css('right', '0px');
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}
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this._label.pack();
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}
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}
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}
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};
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})(jQuery); |