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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 part of html; | 5 part of html; |
6 | 6 |
7 /** | 7 /** |
8 * A class for representing two-dimensional rectangles. | 8 * A base class for representing two-dimensional rectangles. This will hopefully |
| 9 * be moved merged with the dart:math Rect. |
9 */ | 10 */ |
10 class Rect { | 11 // TODO(efortuna): Merge with Math rect after finalizing with Florian. |
11 final num left; | 12 abstract class RectBase { |
12 final num top; | 13 // Not used, but keeps the VM from complaining about Rect having a const |
13 final num width; | 14 // constructor and this one not. |
14 final num height; | 15 const RectBase(); |
15 | 16 |
16 const Rect(this.left, this.top, this.width, this.height); | 17 num get left; |
17 | 18 num get top; |
18 factory Rect.fromPoints(Point a, Point b) { | 19 num get width; |
19 var left; | 20 num get height; |
20 var width; | |
21 if (a.x < b.x) { | |
22 left = a.x; | |
23 width = b.x - left; | |
24 } else { | |
25 left = b.x; | |
26 width = a.x - left; | |
27 } | |
28 var top; | |
29 var height; | |
30 if (a.y < b.y) { | |
31 top = a.y; | |
32 height = b.y - top; | |
33 } else { | |
34 top = b.y; | |
35 height = a.y - top; | |
36 } | |
37 | |
38 return new Rect(left, top, width, height); | |
39 } | |
40 | 21 |
41 num get right => left + width; | 22 num get right => left + width; |
42 num get bottom => top + height; | 23 num get bottom => top + height; |
43 | 24 |
44 // NOTE! All code below should be common with Rect. | 25 // NOTE! All code below should be common with Rect. |
45 // TODO: implement with mixins when available. | |
46 | 26 |
47 String toString() { | 27 String toString() { |
48 return '($left, $top, $width, $height)'; | 28 return '($left, $top, $width, $height)'; |
49 } | 29 } |
50 | 30 |
51 bool operator ==(other) { | 31 bool operator ==(other) { |
52 if (other is !Rect) return false; | 32 if (other is !Rect) return false; |
53 return left == other.left && top == other.top && width == other.width && | 33 return left == other.left && top == other.top && width == other.width && |
54 height == other.height; | 34 height == other.height; |
55 } | 35 } |
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129 * Truncates coordinates to integers and returns the result as a new | 109 * Truncates coordinates to integers and returns the result as a new |
130 * rectangle. | 110 * rectangle. |
131 */ | 111 */ |
132 Rect toInt() => new Rect(left.toInt(), top.toInt(), width.toInt(), | 112 Rect toInt() => new Rect(left.toInt(), top.toInt(), width.toInt(), |
133 height.toInt()); | 113 height.toInt()); |
134 | 114 |
135 Point get topLeft => new Point(this.left, this.top); | 115 Point get topLeft => new Point(this.left, this.top); |
136 Point get bottomRight => new Point(this.left + this.width, | 116 Point get bottomRight => new Point(this.left + this.width, |
137 this.top + this.height); | 117 this.top + this.height); |
138 } | 118 } |
| 119 |
| 120 |
| 121 |
| 122 /** |
| 123 * A class for representing two-dimensional rectangles. |
| 124 * |
| 125 * This class is distinctive from RectBase in that it enforces that its |
| 126 * properties are immutable. |
| 127 */ |
| 128 class Rect extends RectBase { |
| 129 final num left; |
| 130 final num top; |
| 131 final num width; |
| 132 final num height; |
| 133 |
| 134 const Rect(this.left, this.top, this.width, this.height): super(); |
| 135 |
| 136 factory Rect.fromPoints(Point a, Point b) { |
| 137 var left; |
| 138 var width; |
| 139 if (a.x < b.x) { |
| 140 left = a.x; |
| 141 width = b.x - left; |
| 142 } else { |
| 143 left = b.x; |
| 144 width = a.x - left; |
| 145 } |
| 146 var top; |
| 147 var height; |
| 148 if (a.y < b.y) { |
| 149 top = a.y; |
| 150 height = b.y - top; |
| 151 } else { |
| 152 top = b.y; |
| 153 height = a.y - top; |
| 154 } |
| 155 |
| 156 return new Rect(left, top, width, height); |
| 157 } |
| 158 } |
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