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| 1 // | |
| 2 // Copyright 2014 Google Inc. All rights reserved. | |
| 3 // | |
| 4 // Use of this source code is governed by a BSD-style | |
| 5 // license that can be found in the LICENSE file or at | |
| 6 // https://developers.google.com/open-source/licenses/bsd | |
| 7 // | |
| 8 part of charted.core.scales; | |
| 9 | |
| 10 class LinearScale implements Scale { | |
| 11 static const defaultDomain = const [0, 1]; | |
| 12 static const defaultRange = const [0, 1]; | |
| 13 | |
| 14 bool _rounded = false; | |
| 15 Iterable _domain = defaultDomain; | |
| 16 Iterable _range = defaultRange; | |
| 17 | |
| 18 int _ticksCount = 5; | |
| 19 bool _clamp = false; | |
| 20 bool _nice = false; | |
| 21 | |
| 22 Function _invert; | |
| 23 Function _scale; | |
| 24 | |
| 25 LinearScale(); | |
| 26 | |
| 27 LinearScale._clone(LinearScale source) | |
| 28 : _domain = source._domain.toList(), | |
| 29 _range = source._range.toList(), | |
| 30 _ticksCount = source._ticksCount, | |
| 31 _clamp = source._clamp, | |
| 32 _nice = source._nice, | |
| 33 _rounded = source._rounded { | |
| 34 _reset(); | |
| 35 } | |
| 36 | |
| 37 void _reset({bool nice: false}) { | |
| 38 if (nice) { | |
| 39 _domain = ScaleUtils.nice( | |
| 40 _domain, ScaleUtils.niceStep(_linearTickRange().step)); | |
| 41 } | |
| 42 | |
| 43 Function linear = math.min(_domain.length, _range.length) > 2 ? | |
| 44 ScaleUtils.polylinearScale : ScaleUtils.bilinearScale; | |
| 45 | |
| 46 Function uninterpolator = clamp ? uninterpolateClamp : uninterpolateNumber; | |
| 47 InterpolatorGenerator interpolator = | |
| 48 _rounded ? createRoundedNumberInterpolator : createNumberInterpolator; | |
| 49 | |
| 50 _invert = | |
| 51 linear(_range, _domain, uninterpolator, createNumberInterpolator); | |
| 52 _scale = linear(_domain, _range, uninterpolator, interpolator); | |
| 53 } | |
| 54 | |
| 55 @override | |
| 56 set range(Iterable value) { | |
| 57 assert(value != null); | |
| 58 _range = value; | |
| 59 _reset(); | |
| 60 } | |
| 61 | |
| 62 @override | |
| 63 Iterable get range => _range; | |
| 64 | |
| 65 @override | |
| 66 set domain(Iterable value) { | |
| 67 _domain = value; | |
| 68 _reset(nice: _nice); | |
| 69 } | |
| 70 | |
| 71 @override | |
| 72 Iterable get domain => _domain; | |
| 73 | |
| 74 @override | |
| 75 set rounded(bool value) { | |
| 76 assert(value != null); | |
| 77 if (value != null && _rounded != value) { | |
| 78 _rounded = value; | |
| 79 _reset(); | |
| 80 } | |
| 81 } | |
| 82 | |
| 83 @override | |
| 84 bool get rounded => _rounded; | |
| 85 | |
| 86 @override | |
| 87 set ticksCount(int value) { | |
| 88 assert(value != null); | |
| 89 if (value != null && _ticksCount != value) { | |
| 90 _ticksCount = value; | |
| 91 _reset(); | |
| 92 } | |
| 93 } | |
| 94 | |
| 95 @override | |
| 96 int get ticksCount => _ticksCount; | |
| 97 | |
| 98 @override | |
| 99 Iterable get ticks => _linearTickRange(); | |
| 100 | |
| 101 @override | |
| 102 set clamp(bool value) { | |
| 103 assert(value != null); | |
| 104 if (value != null && _clamp != value) { | |
| 105 _clamp = value; | |
| 106 _reset(); | |
| 107 } | |
| 108 } | |
| 109 | |
| 110 @override | |
| 111 bool get clamp => _clamp; | |
| 112 | |
| 113 @override | |
| 114 set nice(bool value) { | |
| 115 assert(value != null); | |
| 116 if (value != null && _nice != value) { | |
| 117 _nice = value; | |
| 118 _reset(nice: _nice); | |
| 119 } | |
| 120 } | |
| 121 | |
| 122 @override | |
| 123 bool get nice => _nice; | |
| 124 | |
| 125 @override | |
| 126 Extent get rangeExtent => ScaleUtils.extent(_range); | |
| 127 | |
| 128 @override | |
| 129 num scale(num value) => _scale(value); | |
| 130 | |
| 131 @override | |
| 132 num invert(num value) => _invert(value); | |
| 133 | |
| 134 Range _linearTickRange([Extent extent]) { | |
| 135 if (extent == null) { | |
| 136 extent = ScaleUtils.extent(_domain); | |
| 137 } | |
| 138 var span = extent.max - extent.min, | |
| 139 step = | |
| 140 math.pow(10, (math.log(span / _ticksCount) / math.LN10).floor()), | |
| 141 err = _ticksCount / span * step; | |
| 142 | |
| 143 // Filter ticks to get closer to the desired count. | |
| 144 if (err <= .15) { | |
| 145 step *= 10; | |
| 146 } | |
| 147 else if (err <= .35) { | |
| 148 step *= 5; | |
| 149 } | |
| 150 else if (err <= .75) { | |
| 151 step *= 2; | |
| 152 } | |
| 153 | |
| 154 return new Range((extent.min / step).ceil() * step, | |
| 155 (extent.max / step).floor() * step + step * 0.5, step); | |
| 156 } | |
| 157 | |
| 158 @override | |
| 159 FormatFunction createTickFormatter([String formatStr]) { | |
| 160 int precision(value) { | |
| 161 return -(math.log(value) / math.LN10 + .01).floor(); | |
| 162 } | |
| 163 Range tickRange = _linearTickRange(); | |
| 164 if (formatStr == null) { | |
| 165 formatStr = ".${precision(tickRange.step)}f"; | |
| 166 } | |
| 167 NumberFormat formatter = new NumberFormat(new EnUsLocale()); | |
| 168 return formatter.format(formatStr); | |
| 169 } | |
| 170 | |
| 171 @override | |
| 172 LinearScale clone() => new LinearScale._clone(this); | |
| 173 } | |
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Chromium Code Reviews
Issue 1400473008:
Roll Observatory packages and add a roll script (Closed)
Base URL: git@github.com:dart-lang/observatory_pub_packages.git@master