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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 _OrdinalScale implements OrdinalScale { | |
| 11 final _index = new Map<dynamic, int>(); | |
| 12 | |
| 13 List _domain = []; | |
| 14 List _range = []; | |
| 15 num _rangeBand = 0; | |
| 16 Extent _rangeExtent; | |
| 17 Function _reset; | |
| 18 | |
| 19 _OrdinalScale(); | |
| 20 | |
| 21 _OrdinalScale._clone(_OrdinalScale source) | |
| 22 : _domain = source._domain, | |
| 23 _range = source._range, | |
| 24 _reset = source._reset, | |
| 25 _rangeExtent = source._rangeExtent, | |
| 26 _rangeBand = source._rangeBand { | |
| 27 _index.addAll(source._index); | |
| 28 } | |
| 29 | |
| 30 @override | |
| 31 scale(dynamic value) { | |
| 32 if (!_index.containsKey(value)) { | |
| 33 _index[value] = domain.length; | |
| 34 _domain.add(value); | |
| 35 } | |
| 36 return _range.isNotEmpty | |
| 37 ? _range.elementAt(_index[value] % _range.length) | |
| 38 : 0; | |
| 39 } | |
| 40 | |
| 41 @override | |
| 42 dynamic invert(num value) { | |
| 43 int position = _range.indexOf(value); | |
| 44 return position > -1 && position < _domain.length | |
| 45 ? _domain[position] | |
| 46 : null; | |
| 47 } | |
| 48 | |
| 49 @override | |
| 50 set domain(Iterable values) { | |
| 51 _domain = []; | |
| 52 _index.clear(); | |
| 53 | |
| 54 for (var i = 0; i < values.length; i++) { | |
| 55 var value = values.elementAt(i); | |
| 56 if (_index[value] == null) { | |
| 57 _index[value] = _domain.length; | |
| 58 _domain.add(value); | |
| 59 } | |
| 60 } | |
| 61 | |
| 62 if (_reset != null) _reset(this); | |
| 63 } | |
| 64 | |
| 65 @override | |
| 66 Iterable get domain => _domain; | |
| 67 | |
| 68 @override | |
| 69 set range(Iterable values) => _setRange(this, values); | |
| 70 | |
| 71 @override | |
| 72 Iterable get range => _range; | |
| 73 | |
| 74 @override | |
| 75 Extent get rangeExtent => _rangeExtent; | |
| 76 | |
| 77 @override | |
| 78 void rangePoints(Iterable range, [double padding = 0.0]) => | |
| 79 _setRangePoints(this, range, padding); | |
| 80 | |
| 81 @override | |
| 82 void rangeBands(Iterable range, | |
| 83 [double padding = 0.0, double outerPadding]) => | |
| 84 _setRangeBands(this, range, padding, | |
| 85 outerPadding == null ? padding : outerPadding); | |
| 86 | |
| 87 @override | |
| 88 void rangeRoundBands(Iterable range, | |
| 89 [double padding = 0.0, double outerPadding]) => | |
| 90 _setRangeRoundBands(this, range, padding, | |
| 91 outerPadding == null ? padding : outerPadding); | |
| 92 | |
| 93 @override | |
| 94 num get rangeBand => _rangeBand; | |
| 95 | |
| 96 @override | |
| 97 FormatFunction createTickFormatter([String format]) => identityFunction; | |
| 98 | |
| 99 @override | |
| 100 Iterable get ticks => _domain; | |
| 101 | |
| 102 @override | |
| 103 OrdinalScale clone() => new _OrdinalScale._clone(this); | |
| 104 | |
| 105 List _steps(start, step) => | |
| 106 new Range(domain.length).map((num i) => start + step * i).toList(); | |
| 107 | |
| 108 static void _setRange(_OrdinalScale scale, Iterable values) { | |
| 109 scale._reset = (_OrdinalScale s) { | |
| 110 s._range = values; | |
| 111 s._rangeBand = 0; | |
| 112 s._rangeExtent = null; | |
| 113 }; | |
| 114 scale._reset(scale); | |
| 115 } | |
| 116 | |
| 117 static void _setRangePoints( | |
| 118 _OrdinalScale scale, Iterable range, double padding) { | |
| 119 scale._reset = (_OrdinalScale s) { | |
| 120 var start = range.first, | |
| 121 stop = range.last, | |
| 122 step = (stop - start) / (s.domain.length - 1 + padding); | |
| 123 | |
| 124 s._range = s._steps(s.domain.length < 2 | |
| 125 ? (start + stop) / 2 | |
| 126 : start + step * padding / 2, step); | |
| 127 s._rangeBand = 0; | |
| 128 s._rangeExtent = new Extent(start, stop); | |
| 129 }; | |
| 130 if (scale.domain.isNotEmpty) { | |
| 131 scale._reset(scale); | |
| 132 } | |
| 133 } | |
| 134 | |
| 135 static void _setRangeBands(_OrdinalScale scale, | |
| 136 Iterable range, double padding, double outerPadding) { | |
| 137 scale._reset = (_OrdinalScale s) { | |
| 138 var start = range.first, | |
| 139 stop = range.last, | |
| 140 step = (stop - start) / s.domain.length - padding + 2 * outerPadding; | |
| 141 | |
| 142 s._range = s._steps(start + step * outerPadding, step); | |
| 143 s._rangeBand = step * (1 - padding); | |
| 144 s._rangeExtent = new Extent(start, stop); | |
| 145 }; | |
| 146 if (scale.domain.isNotEmpty){ | |
| 147 scale._reset(scale); | |
| 148 } | |
| 149 } | |
| 150 | |
| 151 static void _setRangeRoundBands(_OrdinalScale scale, | |
| 152 Iterable range, double padding, double outerPadding) { | |
| 153 scale._reset = (_OrdinalScale s) { | |
| 154 var start = range.first, | |
| 155 stop = range.last, | |
| 156 step = ((stop - start) / | |
| 157 (s.domain.length - padding + 2 * outerPadding)).floor(), | |
| 158 error = stop - start - (s.domain.length - padding) * step; | |
| 159 | |
| 160 s._range = s._steps(start + (error / 2).round(), step); | |
| 161 s._rangeBand = (step * (1 - padding)).round(); | |
| 162 s._rangeExtent = new Extent(start, stop); | |
| 163 }; | |
| 164 if (scale.domain.isNotEmpty) { | |
| 165 scale._reset(scale); | |
| 166 } | |
| 167 } | |
| 168 | |
| 169 // | |
| 170 // Properties that are valid only on quantitative scales. | |
| 171 // | |
| 172 | |
| 173 bool clamp; | |
| 174 bool nice; | |
| 175 bool rounded; | |
| 176 int ticksCount; | |
| 177 } | |
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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