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| 1 /* | |
| 2 Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 3 Use of this source code is governed by a BSD-style license that can be | |
| 4 found in the LICENSE file. | |
| 5 */ | |
| 6 | |
| 7 /** | |
| 8 * @fileoverview Class and functions to handle positioning of plot data points. | |
| 9 */ | |
| 10 | |
| 11 /** | |
| 12 * Class that handles plot data positioning. | |
| 13 * @constructor | |
| 14 * @param {Array.<Array.<Array.<number>>>>} plotData Data that will be plotted. | |
| 15 * It is an array of lines, where each line is an array of points, and each | |
| 16 * point is a length-2 array representing an (x, y) pair. | |
| 17 */ | |
| 18 function Coordinates(plotData) { | |
| 19 this.plotData = plotData; | |
| 20 | |
| 21 height = window.innerHeight - 16; | |
| 22 width = window.innerWidth - 16; | |
| 23 | |
| 24 this.widthMax = width; | |
| 25 this.heightMax = Math.min(400, height - 85); | |
| 26 | |
| 27 this.processValues_('x'); | |
| 28 this.processValues_('y'); | |
| 29 } | |
| 30 | |
| 31 /** | |
| 32 * Determines the min/max x or y values in the plot, accounting for some extra | |
| 33 * buffer space. | |
| 34 * @param {string} type The type of value to process, either 'x' or 'y'. | |
| 35 */ | |
| 36 Coordinates.prototype.processValues_ = function (type) { | |
| 37 var merged = []; | |
| 38 for (var i = 0; i < this.plotData.length; i++) | |
| 39 for (var j = 0; j < this.plotData[i].length; j++) { | |
| 40 if (type == 'x') | |
| 41 merged.push(parseFloat(this.plotData[i][j][0])); // Index 0 is x value. | |
| 42 else | |
| 43 merged.push(parseFloat(this.plotData[i][j][1])); // Index 1 is y value. | |
| 44 } | |
| 45 | |
| 46 min = merged[0]; | |
| 47 max = merged[0]; | |
| 48 for (var i = 1; i < merged.length; ++i) { | |
| 49 if (isNaN(min) || merged[i] < min) | |
| 50 min = merged[i]; | |
| 51 if (isNaN(max) || merged[i] > max) | |
| 52 max = merged[i]; | |
| 53 } | |
| 54 | |
| 55 var bufferSpace = 0.02 * (max - min); | |
| 56 | |
| 57 if (type == 'x') { | |
| 58 this.xBufferSpace_ = bufferSpace; | |
| 59 this.xMinValue_ = min; | |
| 60 this.xMaxValue_ = max; | |
| 61 } else { | |
| 62 this.yBufferSpace_ = bufferSpace; | |
| 63 this.yMinValue_ = min; | |
| 64 this.yMaxValue_ = max; | |
| 65 } | |
| 66 }; | |
| 67 | |
| 68 /** | |
| 69 * Difference between horizontal upper and lower limit values. | |
| 70 * @return {number} The x value range. | |
| 71 */ | |
| 72 Coordinates.prototype.xValueRange = function() { | |
| 73 return this.xUpperLimitValue() - this.xLowerLimitValue(); | |
| 74 }; | |
| 75 | |
| 76 /** | |
| 77 * Difference between vertical upper and lower limit values. | |
| 78 * @return {number} The y value range. | |
| 79 */ | |
| 80 Coordinates.prototype.yValueRange = function() { | |
| 81 return this.yUpperLimitValue() - this.yLowerLimitValue(); | |
| 82 }; | |
| 83 | |
| 84 /** | |
| 85 * Converts horizontal data value to pixel value on canvas. | |
| 86 * @param {number} value The x data value. | |
| 87 * @return {number} The corresponding x pixel value on the canvas. | |
| 88 */ | |
| 89 Coordinates.prototype.xPixel = function(value) { | |
| 90 return this.widthMax * | |
| 91 ((value - this.xLowerLimitValue()) / this.xValueRange()); | |
| 92 }; | |
| 93 | |
| 94 /** | |
| 95 * Converts vertical data value to pixel value on canvas. | |
| 96 * @param {number} value The y data value. | |
| 97 * @return {number} The corresponding y pixel value on the canvas. | |
| 98 */ | |
| 99 Coordinates.prototype.yPixel = function(value) { | |
| 100 if (this.yValueRange() == 0) { | |
| 101 // Completely horizontal lines should be centered horizontally. | |
| 102 return this.heightMax / 2; | |
| 103 } else { | |
| 104 return this.heightMax - | |
| 105 (this.heightMax * | |
| 106 (value - this.yLowerLimitValue()) / this.yValueRange()); | |
| 107 } | |
| 108 }; | |
| 109 | |
| 110 /** | |
| 111 * Converts x point on canvas to data value it represents. | |
| 112 * @param {number} position The x pixel value on the canvas. | |
| 113 * @return {number} The corresponding x data value. | |
| 114 */ | |
| 115 Coordinates.prototype.xValue = function(position) { | |
| 116 return this.xLowerLimitValue() + | |
| 117 (position / this.widthMax * this.xValueRange()); | |
| 118 }; | |
| 119 | |
| 120 /** | |
| 121 * Converts y point on canvas to data value it represents. | |
| 122 * @param {number} position The y pixel value on the canvas. | |
| 123 * @return {number} The corresponding y data value. | |
| 124 */ | |
| 125 Coordinates.prototype.yValue = function(position) { | |
| 126 var ratio = this.heightMax / (this.heightMax - position); | |
| 127 return this.yLowerLimitValue() + (this.yValueRange() / ratio); | |
| 128 }; | |
| 129 | |
| 130 /** | |
| 131 * Returns the minimum x value of all the data points. | |
| 132 * @return {number} The minimum x value of all the data points. | |
| 133 */ | |
| 134 Coordinates.prototype.xMinValue = function() { | |
| 135 return this.xMinValue_; | |
| 136 }; | |
| 137 | |
| 138 /** | |
| 139 * Returns the maximum x value of all the data points. | |
| 140 * @return {number} The maximum x value of all the data points. | |
| 141 */ | |
| 142 Coordinates.prototype.xMaxValue = function() { | |
| 143 return this.xMaxValue_; | |
| 144 }; | |
| 145 | |
| 146 /** | |
| 147 * Returns the minimum y value of all the data points. | |
| 148 * @return {number} The minimum y value of all the data points. | |
| 149 */ | |
| 150 Coordinates.prototype.yMinValue = function() { | |
| 151 return this.yMinValue_; | |
| 152 }; | |
| 153 | |
| 154 /** | |
| 155 * Returns the maximum y value of all the data points. | |
| 156 * @return {number} The maximum y value of all the data points. | |
| 157 */ | |
| 158 Coordinates.prototype.yMaxValue = function() { | |
| 159 return this.yMaxValue_; | |
| 160 }; | |
| 161 | |
| 162 /** | |
| 163 * Returns the x value at the lower limit of the bounding box of the canvas. | |
| 164 * @return {number} The x value at the lower limit of the bounding box of | |
| 165 * the canvas. | |
| 166 */ | |
| 167 Coordinates.prototype.xLowerLimitValue = function() { | |
| 168 return this.xMinValue_ - this.xBufferSpace_; | |
| 169 }; | |
| 170 | |
| 171 /** | |
| 172 * Returns the x value at the upper limit of the bounding box of the canvas. | |
| 173 * @return {number} The x value at the upper limit of the bounding box of | |
| 174 * the canvas. | |
| 175 */ | |
| 176 Coordinates.prototype.xUpperLimitValue = function() { | |
| 177 return this.xMaxValue_ + this.xBufferSpace_; | |
| 178 }; | |
| 179 | |
| 180 /** | |
| 181 * Returns the y value at the lower limit of the bounding box of the canvas. | |
| 182 * @return {number} The y value at the lower limit of the bounding box of | |
| 183 * the canvas. | |
| 184 */ | |
| 185 Coordinates.prototype.yLowerLimitValue = function() { | |
| 186 return this.yMinValue_ - this.yBufferSpace_; | |
| 187 }; | |
| 188 | |
| 189 /** | |
| 190 * Returns the y value at the upper limit of the bounding box of the canvas. | |
| 191 * @return {number} The y value at the upper limit of the bounding box of | |
| 192 * the canvas. | |
| 193 */ | |
| 194 Coordinates.prototype.yUpperLimitValue = function() { | |
| 195 return this.yMaxValue_ + this.yBufferSpace_; | |
| 196 }; | |
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