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jqplot.logAxisRenderer.js
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/**
* jqPlot
* Pure JavaScript plotting plugin using jQuery
*
* Version: 1.0.7
* Revision: 1224
*
* Copyright (c) 2009-2013 Chris Leonello
* jqPlot is currently available for use in all personal or commercial projects
* under both the MIT (http://www.opensource.org/licenses/mit-license.php) and GPL
* version 2.0 (http://www.gnu.org/licenses/gpl-2.0.html) licenses. This means that you can
* choose the license that best suits your project and use it accordingly.
*
* Although not required, the author would appreciate an email letting him
* know of any substantial use of jqPlot. You can reach the author at:
* chris at jqplot dot com or see http://www.jqplot.com/info.php .
*
* If you are feeling kind and generous, consider supporting the project by
* making a donation at: http://www.jqplot.com/donate.php .
*
* sprintf functions contained in jqplot.sprintf.js by Ash Searle:
*
* version 2007.04.27
* author Ash Searle
* http://hexmen.com/blog/2007/03/printf-sprintf/
* http://hexmen.com/js/sprintf.js
* The author (Ash Searle) has placed this code in the public domain:
* "This code is unrestricted: you are free to use it however you like."
*
*/
(function($) {
/**
* class: $.jqplot.LogAxisRenderer
* A plugin for a jqPlot to render a logarithmic axis.
*
* To use this renderer, include the plugin in your source
* > <script type="text/javascript" language="javascript" src="plugins/jqplot.logAxisRenderer.js"></script>
*
* and supply the appropriate options to your plot
*
* > {axes:{xaxis:{renderer:$.jqplot.LogAxisRenderer}}}
**/
$.jqplot.LogAxisRenderer = function() {
$.jqplot.LinearAxisRenderer.call(this);
// prop: axisDefaults
// Default properties which will be applied directly to the series.
//
// Group: Properties
//
// Properties
//
// base - the logarithmic base, commonly 2, 10 or Math.E
// tickDistribution - Deprecated. "power" distribution of ticks
// always used. Option has no effect.
this.axisDefaults = {
base : 10,
tickDistribution :'power'
};
};
$.jqplot.LogAxisRenderer.prototype = new $.jqplot.LinearAxisRenderer();
$.jqplot.LogAxisRenderer.prototype.constructor = $.jqplot.LogAxisRenderer;
$.jqplot.LogAxisRenderer.prototype.init = function(options) {
// prop: drawBaseline
// True to draw the axis baseline.
this.drawBaseline = true;
// prop: minorTicks
// Number of ticks to add between "major" ticks.
// Major ticks are ticks supplied by user or auto computed.
// Minor ticks cannot be created by user.
this.minorTicks = 'auto';
this._scalefact = 1.0;
$.extend(true, this, options);
this._autoFormatString = '%d';
this._overrideFormatString = false;
for (var d in this.renderer.axisDefaults) {
if (this[d] == null) {
this[d] = this.renderer.axisDefaults[d];
}
}
this.resetDataBounds();
};
$.jqplot.LogAxisRenderer.prototype.createTicks = function(plot) {
// we're are operating on an axis here
var ticks = this._ticks;
var userTicks = this.ticks;
var name = this.name;
var db = this._dataBounds;
var dim = (this.name.charAt(0) === 'x') ? this._plotDimensions.width : this._plotDimensions.height;
var interval;
var min, max;
var pos1, pos2;
var tt, i;
var threshold = 30;
// For some reason scalefactor is screwing up ticks.
this._scalefact = (Math.max(dim, threshold+1) - threshold)/300;
// if we already have ticks, use them.
// ticks must be in order of increasing value.
if (userTicks.length) {
// ticks could be 1D or 2D array of [val, val, ,,,] or [[val, label], [val, label], ...] or mixed
for (i=0; i<userTicks.length; i++){
var ut = userTicks[i];
var t = new this.tickRenderer(this.tickOptions);
if (ut.constructor == Array) {
t.value = ut[0];
t.label = ut[1];
if (!this.showTicks) {
t.showLabel = false;
t.showMark = false;
}
else if (!this.showTickMarks) {
t.showMark = false;
}
t.setTick(ut[0], this.name);
this._ticks.push(t);
}
else if ($.isPlainObject(ut)) {
$.extend(true, t, ut);
t.axis = this.name;
this._ticks.push(t);
}
else {
t.value = ut;
if (!this.showTicks) {
t.showLabel = false;
t.showMark = false;
}
else if (!this.showTickMarks) {
t.showMark = false;
}
t.setTick(ut, this.name);
this._ticks.push(t);
}
}
this.numberTicks = userTicks.length;
this.min = this._ticks[0].value;
this.max = this._ticks[this.numberTicks-1].value;
}
// we don't have any ticks yet, let's make some!
else if (this.min == null && this.max == null) {
min = db.min * (2 - this.padMin);
max = db.max * this.padMax;
// if min and max are same, space them out a bit
if (min == max) {
var adj = 0.05;
min = min*(1-adj);
max = max*(1+adj);
}
// perform some checks
if (this.min != null && this.min <= 0) {
throw('log axis minimum must be greater than 0');
}
if (this.max != null && this.max <= 0) {
throw('log axis maximum must be greater than 0');
}
function findCeil (val) {
var order = Math.pow(10, Math.floor(Math.log(val)/Math.LN10));
return Math.ceil(val/order) * order;
}
function findFloor(val) {
var order = Math.pow(10, Math.floor(Math.log(val)/Math.LN10));
return Math.floor(val/order) * order;
}
// var range = max - min;
var rmin, rmax;
// for power distribution, open up range to get a nice power of axis.renderer.base.
// power distribution won't respect the user's min/max settings.
rmin = Math.pow(this.base, Math.floor(Math.log(min)/Math.log(this.base)));
rmax = Math.pow(this.base, Math.ceil(Math.log(max)/Math.log(this.base)));
// // if min and max are same, space them out a bit
// if (rmin === rmax) {
// var adj = 0.05;
// rmin = rmin*(1-adj);
// rmax = rmax*(1+adj);
// }
// Handle case where a data value was zero
if (rmin === 0) {
rmin = 1;
}
var order = Math.round(Math.log(rmin)/Math.LN10);
if (this.tickOptions == null || !this.tickOptions.formatString) {
this._overrideFormatString = true;
}
this.min = rmin;
this.max = rmax;
var range = this.max - this.min;
var minorTicks = (this.minorTicks === 'auto') ? 0 : this.minorTicks;
var numberTicks;
if (this.numberTicks == null){
if (dim > 140) {
numberTicks = Math.round(Math.log(this.max/this.min)/Math.log(this.base) + 1);
if (numberTicks < 2) {
numberTicks = 2;
}
if (minorTicks === 0) {
var temp = dim/(numberTicks - 1);
if (temp < 100) {
minorTicks = 0;
}
else if (temp < 190) {
minorTicks = 1;
}
else if (temp < 250) {
minorTicks = 3;
}
else if (temp < 600) {
minorTicks = 4;
}
else {
minorTicks = 9;
}
}
}
else {
numberTicks = 2;
if (minorTicks === 0) {
minorTicks = 1;
}
minorTicks = 0;
}
}
else {
numberTicks = this.numberTicks;
}
if (order >= 0 && minorTicks !== 3) {
this._autoFormatString = '%d';
}
// Adjust format string for case with 3 ticks where we'll have like 1, 2.5, 5, 7.5, 10
else if (order <= 0 && minorTicks === 3) {
var temp = -(order - 1);
this._autoFormatString = '%.'+ Math.abs(order-1) + 'f';
}
// Adjust format string for values less than 1.
else if (order < 0) {
var temp = -order;
this._autoFormatString = '%.'+ Math.abs(order) + 'f';
}
else {
this._autoFormatString = '%d';
}
var to, t, val, tt1, spread, interval;
for (var i=0; i<numberTicks; i++){
tt = Math.pow(this.base, i - numberTicks + 1) * this.max;
t = new this.tickRenderer(this.tickOptions);
if (this._overrideFormatString) {
t.formatString = this._autoFormatString;
}
if (!this.showTicks) {
t.showLabel = false;
t.showMark = false;
}
else if (!this.showTickMarks) {
t.showMark = false;
}
t.setTick(tt, this.name);
this._ticks.push(t);
if (minorTicks && i<numberTicks-1) {
tt1 = Math.pow(this.base, i - numberTicks + 2) * this.max;
spread = tt1 - tt;
interval = tt1 / (minorTicks+1);
for (var j=minorTicks-1; j>=0; j--) {
val = tt1-interval*(j+1);
t = new this.tickRenderer(this.tickOptions);
if (this._overrideFormatString && this._autoFormatString != '') {
t.formatString = this._autoFormatString;
}
if (!this.showTicks) {
t.showLabel = false;
t.showMark = false;
}
else if (!this.showTickMarks) {
t.showMark = false;
}
t.setTick(val, this.name);
this._ticks.push(t);
}
}
}
}
// min and max are set as would be the case with zooming
else if (this.min != null && this.max != null) {
var opts = $.extend(true, {}, this.tickOptions, {name: this.name, value: null});
var nt, ti;
// don't have an interval yet, pick one that gives the most
// "round" ticks we can get.
if (this.numberTicks == null && this.tickInterval == null) {
// var threshold = 30;
var tdim = Math.max(dim, threshold+1);
var nttarget = Math.ceil((tdim-threshold)/35 + 1);
var ret = $.jqplot.LinearTickGenerator.bestConstrainedInterval(this.min, this.max, nttarget);
this._autoFormatString = ret[3];
nt = ret[2];
ti = ret[4];
for (var i=0; i<nt; i++) {
opts.value = this.min + i * ti;
t = new this.tickRenderer(opts);
if (this._overrideFormatString && this._autoFormatString != '') {
t.formatString = this._autoFormatString;
}
if (!this.showTicks) {
t.showLabel = false;
t.showMark = false;
}
else if (!this.showTickMarks) {
t.showMark = false;
}
this._ticks.push(t);
}
}
// for loose zoom, number ticks and interval are also set.
else if (this.numberTicks != null && this.tickInterval != null) {
nt = this.numberTicks;
for (var i=0; i<nt; i++) {
opts.value = this.min + i * this.tickInterval;
t = new this.tickRenderer(opts);
if (this._overrideFormatString && this._autoFormatString != '') {
t.formatString = this._autoFormatString;
}
if (!this.showTicks) {
t.showLabel = false;
t.showMark = false;
}
else if (!this.showTickMarks) {
t.showMark = false;
}
this._ticks.push(t);
}
}
}
};
$.jqplot.LogAxisRenderer.prototype.pack = function(pos, offsets) {
var lb = parseInt(this.base, 10);
var ticks = this._ticks;
var trans = function (v) { return Math.log(v)/Math.log(lb); };
var invtrans = function (v) { return Math.pow(Math.E, (Math.log(lb)*v)); };
var max = trans(this.max);
var min = trans(this.min);
var offmax = offsets.max;
var offmin = offsets.min;
var lshow = (this._label == null) ? false : this._label.show;
for (var p in pos) {
this._elem.css(p, pos[p]);
}
this._offsets = offsets;
// pixellength will be + for x axes and - for y axes becasue pixels always measured from top left.
var pixellength = offmax - offmin;
var unitlength = max - min;
// point to unit and unit to point conversions references to Plot DOM element top left corner.
this.p2u = function(p){
return invtrans((p - offmin) * unitlength / pixellength + min);
};
this.u2p = function(u){
return (trans(u) - min) * pixellength / unitlength + offmin;
};
if (this.name == 'xaxis' || this.name == 'x2axis'){
this.series_u2p = function(u){
return (trans(u) - min) * pixellength / unitlength;
};
this.series_p2u = function(p){
return invtrans(p * unitlength / pixellength + min);
};
}
// yaxis is max at top of canvas.
else {
this.series_u2p = function(u){
return (trans(u) - max) * pixellength / unitlength;
};
this.series_p2u = function(p){
return invtrans(p * unitlength / pixellength + max);
};
}
if (this.show) {
if (this.name == 'xaxis' || this.name == 'x2axis') {
for (var i=0; i<ticks.length; i++) {
var t = ticks[i];
if (t.show && t.showLabel) {
var shim;
if (t.constructor == $.jqplot.CanvasAxisTickRenderer && t.angle) {
switch (t.labelPosition) {
case 'auto':
// position at end
if (t.angle < 0) {
shim = -t.getWidth() + t._textRenderer.height * Math.sin(-t._textRenderer.angle) / 2;
}
// position at start
else {
shim = -t._textRenderer.height * Math.sin(t._textRenderer.angle) / 2;
}
break;
case 'end':
shim = -t.getWidth() + t._textRenderer.height * Math.sin(-t._textRenderer.angle) / 2;
break;
case 'start':
shim = -t._textRenderer.height * Math.sin(t._textRenderer.angle) / 2;
break;
case 'middle':
shim = -t.getWidth()/2 + t._textRenderer.height * Math.sin(-t._textRenderer.angle) / 2;
break;
default:
shim = -t.getWidth()/2 + t._textRenderer.height * Math.sin(-t._textRenderer.angle) / 2;
break;
}
}
else {
shim = -t.getWidth()/2;
}
// var shim = t.getWidth()/2;
var val = this.u2p(t.value) + shim + 'px';
t._elem.css('left', val);
t.pack();
}
}
if (lshow) {
var w = this._label._elem.outerWidth(true);
this._label._elem.css('left', offmin + pixellength/2 - w/2 + 'px');
if (this.name == 'xaxis') {
this._label._elem.css('bottom', '0px');
}
else {
this._label._elem.css('top', '0px');
}
this._label.pack();
}
}
else {
for (var i=0; i<ticks.length; i++) {
var t = ticks[i];
if (t.show && t.showLabel) {
var shim;
if (t.constructor == $.jqplot.CanvasAxisTickRenderer && t.angle) {
switch (t.labelPosition) {
case 'auto':
// position at end
case 'end':
if (t.angle < 0) {
shim = -t._textRenderer.height * Math.cos(-t._textRenderer.angle) / 2;
}
else {
shim = -t.getHeight() + t._textRenderer.height * Math.cos(t._textRenderer.angle) / 2;
}
break;
case 'start':
if (t.angle > 0) {
shim = -t._textRenderer.height * Math.cos(-t._textRenderer.angle) / 2;
}
else {
shim = -t.getHeight() + t._textRenderer.height * Math.cos(t._textRenderer.angle) / 2;
}
break;
case 'middle':
// if (t.angle > 0) {
// shim = -t.getHeight()/2 + t._textRenderer.height * Math.sin(-t._textRenderer.angle) / 2;
// }
// else {
// shim = -t.getHeight()/2 - t._textRenderer.height * Math.sin(t._textRenderer.angle) / 2;
// }
shim = -t.getHeight()/2;
break;
default:
shim = -t.getHeight()/2;
break;
}
}
else {
shim = -t.getHeight()/2;
}
var val = this.u2p(t.value) + shim + 'px';
t._elem.css('top', val);
t.pack();
}
}
if (lshow) {
var h = this._label._elem.outerHeight(true);
this._label._elem.css('top', offmax - pixellength/2 - h/2 + 'px');
if (this.name == 'yaxis') {
this._label._elem.css('left', '0px');
}
else {
this._label._elem.css('right', '0px');
}
this._label.pack();
}
}
}
};
})(jQuery);