| 1 | /* |
| 2 | PlotKit Layout |
| 3 | ============== |
| 4 | |
| 5 | Handles laying out data on to a virtual canvas square canvas between 0.0 |
| 6 | and 1.0. If you want to add new chart/plot types such as point plots, |
| 7 | you need to add them here. |
| 8 | |
| 9 | Copyright |
| 10 | --------- |
| 11 | Copyright 2005,2006 (c) Alastair Tse <alastair^liquidx.net> |
| 12 | For use under the BSD license. <http://www.liquidx.net/plotkit> |
| 13 | |
| 14 | */ |
| 15 | |
| 16 | // -------------------------------------------------------------------- |
| 17 | // Start of Layout definition |
| 18 | // -------------------------------------------------------------------- |
| 19 | |
| 20 | if (typeof(PlotKit.Layout) == 'undefined') { |
| 21 | PlotKit.Layout = {}; |
| 22 | } |
| 23 | |
| 24 | // -------------------------------------------------------------------- |
| 25 | // Start of Layout definition |
| 26 | // -------------------------------------------------------------------- |
| 27 | |
| 28 | PlotKit.Layout = function(style, options) { |
| 29 | this.options = { }; |
| 30 | |
| 31 | // valid external options : TODO: input verification |
| 32 | MochiKit.Base.update(this.options, options ? options : {}); |
| 33 | |
| 34 | // internal states |
| 35 | this.datasets = new Array(); |
| 36 | }; |
| 37 | |
| 38 | // -------------------------------------------------------------------- |
| 39 | // Dataset Manipulation |
| 40 | // -------------------------------------------------------------------- |
| 41 | |
| 42 | |
| 43 | PlotKit.Layout.prototype.addDataset = function(setname, set_xy) { |
| 44 | this.datasets[setname] = set_xy; |
| 45 | }; |
| 46 | |
| 47 | // -------------------------------------------------------------------- |
| 48 | // Evaluates the layout for the current data and style. |
| 49 | // -------------------------------------------------------------------- |
| 50 | |
| 51 | PlotKit.Layout.prototype.evaluate = function() { |
| 52 | this._evaluateLimits(); |
| 53 | this._evaluateLineCharts(); |
| 54 | this._evaluateLineTicks(); |
| 55 | }; |
| 56 | |
| 57 | |
| 58 | // -------------------------------------------------------------------- |
| 59 | // START Internal Functions |
| 60 | // -------------------------------------------------------------------- |
| 61 | |
| 62 | PlotKit.Layout.prototype._evaluateLimits = function() { |
| 63 | this.minxval = this.maxxval = null; |
| 64 | for (var name in this.datasets) { |
| 65 | var series = this.datasets[name]; |
| 66 | var x1 = series[0][0]; |
| 67 | if (!this.minxval || x1 < this.minxval) this.minxval = x1; |
| 68 | |
| 69 | var x2 = series[series.length - 1][0]; |
| 70 | if (!this.maxxval || x2 > this.maxxval) this.maxxval = x2; |
| 71 | } |
| 72 | this.xrange = this.maxxval - this.minxval; |
| 73 | this.xscale = (this.xrange != 0 ? 1/this.xrange : 1.0); |
| 74 | |
| 75 | this.minyval = this.options.yAxis[0]; |
| 76 | this.maxyval = this.options.yAxis[1]; |
| 77 | this.yrange = this.maxyval - this.minyval; |
| 78 | this.yscale = (this.yrange != 0 ? 1/this.yrange : 1.0); |
| 79 | }; |
| 80 | |
| 81 | // Create the line charts |
| 82 | PlotKit.Layout.prototype._evaluateLineCharts = function() { |
| 83 | var items = PlotKit.Base.items; |
| 84 | |
| 85 | var setCount = items(this.datasets).length; |
| 86 | |
| 87 | // add all the rects |
| 88 | this.points = new Array(); |
| 89 | for (var setName in this.datasets) { |
| 90 | var dataset = this.datasets[setName]; |
| 91 | for (var j = 0; j < dataset.length; j++) { |
| 92 | var item = dataset[j]; |
| 93 | var point = { |
| 94 | x: ((parseFloat(item[0]) - this.minxval) * this.xscale), |
| 95 | y: 1.0 - ((parseFloat(item[1]) - this.minyval) * this.yscale), |
| 96 | xval: parseFloat(item[0]), |
| 97 | yval: parseFloat(item[1]), |
| 98 | name: setName |
| 99 | }; |
| 100 | |
| 101 | // limit the x, y values so they do not overdraw |
| 102 | if (point.y <= 0.0) { |
| 103 | point.y = 0.0; |
| 104 | } |
| 105 | if (point.y >= 1.0) { |
| 106 | point.y = 1.0; |
| 107 | } |
| 108 | if ((point.x >= 0.0) && (point.x <= 1.0)) { |
| 109 | this.points.push(point); |
| 110 | } |
| 111 | } |
| 112 | } |
| 113 | }; |
| 114 | |
| 115 | PlotKit.Layout.prototype._evaluateLineTicks = function() { |
| 116 | this.xticks = new Array(); |
| 117 | for (var i = 0; i < this.options.xTicks.length; i++) { |
| 118 | var tick = this.options.xTicks[i]; |
| 119 | var label = tick.label; |
| 120 | var pos = this.xscale * (tick.v - this.minxval); |
| 121 | if ((pos >= 0.0) && (pos <= 1.0)) { |
| 122 | this.xticks.push([pos, label]); |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | this.yticks = new Array(); |
| 127 | for (var i = 0; i < this.options.yTicks.length; i++) { |
| 128 | var tick = this.options.yTicks[i]; |
| 129 | var label = tick.label; |
| 130 | var pos = 1.0 - (this.yscale * (tick.v - this.minyval)); |
| 131 | if ((pos >= 0.0) && (pos <= 1.0)) { |
| 132 | this.yticks.push([pos, label]); |
| 133 | } |
| 134 | } |
| 135 | }; |
| 136 | |