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Side by Side Diff: samples/swarm/swarm_ui_lib/touch/Geometry.dart

Issue 11361190: a === b -> identical(a, b) (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Address comments. Created 8 years, 1 month ago
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1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file 1 // Copyright (c) 2011, 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 /** 5 /**
6 * Represents a point in 2 dimensional space. 6 * Represents a point in 2 dimensional space.
7 */ 7 */
8 class Coordinate { 8 class Coordinate {
9 9
10 /** 10 /**
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30 return new Coordinate(a.x - b.x, a.y - b.y); 30 return new Coordinate(a.x - b.x, a.y - b.y);
31 } 31 }
32 32
33 static num distance(Coordinate a, Coordinate b) { 33 static num distance(Coordinate a, Coordinate b) {
34 final dx = a.x - b.x; 34 final dx = a.x - b.x;
35 final dy = a.y - b.y; 35 final dy = a.y - b.y;
36 return Math.sqrt(dx * dx + dy * dy); 36 return Math.sqrt(dx * dx + dy * dy);
37 } 37 }
38 38
39 bool operator ==(Coordinate other) { 39 bool operator ==(Coordinate other) {
40 return other !== null && x == other.x && y == other.y; 40 return other != null && x == other.x && y == other.y;
41 } 41 }
42 42
43 static num squaredDistance(Coordinate a, Coordinate b) { 43 static num squaredDistance(Coordinate a, Coordinate b) {
44 final dx = a.x - b.x; 44 final dx = a.x - b.x;
45 final dy = a.y - b.y; 45 final dy = a.y - b.y;
46 return dx * dx + dy * dy; 46 return dx * dx + dy * dy;
47 } 47 }
48 48
49 static Coordinate sum(Coordinate a, Coordinate b) { 49 static Coordinate sum(Coordinate a, Coordinate b) {
50 return new Coordinate(a.x + b.x, a.y + b.y); 50 return new Coordinate(a.x + b.x, a.y + b.y);
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66 final num start; 66 final num start;
67 final num end; 67 final num end;
68 68
69 Interval(num this.start, num this.end) {} 69 Interval(num this.start, num this.end) {}
70 70
71 num get length { 71 num get length {
72 return end - start; 72 return end - start;
73 } 73 }
74 74
75 bool operator ==(Interval other) { 75 bool operator ==(Interval other) {
76 return other !== null && other.start == start && other.end == end; 76 return other != null && other.start == start && other.end == end;
77 } 77 }
78 78
79 Interval union(Interval other) { 79 Interval union(Interval other) {
80 return new Interval(Math.min(start, other.start), 80 return new Interval(Math.min(start, other.start),
81 Math.max(end, other.end)); 81 Math.max(end, other.end));
82 } 82 }
83 83
84 bool contains(num value) { 84 bool contains(num value) {
85 return value >= start && value < end; 85 return value >= start && value < end;
86 } 86 }
87 87
88 String toString() { 88 String toString() {
89 return '(${start}, ${end})'; 89 return '(${start}, ${end})';
90 } 90 }
91 } 91 }
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