source: other-projects/playing-in-the-street/summer-2013/trunk/Playing-in-the-Street-WPF/Content/Web/mrdoob-three.js-4862f5f/src/math/Vector2.js@ 28897

Last change on this file since 28897 was 28897, checked in by davidb, 10 years ago

GUI front-end to server base plus web page content
File size: 3.9 KB
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1/**
2 * @author mrdoob / http://mrdoob.com/
3 * @author philogb / http://blog.thejit.org/
4 * @author egraether / http://egraether.com/
5 * @author zz85 / http://www.lab4games.net/zz85/blog
6 */
7
8THREE.Vector2 = function ( x, y ) {
9
10 this.x = x || 0;
11 this.y = y || 0;
12
13};
14
15THREE.Vector2.prototype = {
16
17 constructor: THREE.Vector2,
18
19 set: function ( x, y ) {
20
21 this.x = x;
22 this.y = y;
23
24 return this;
25
26 },
27
28 setX: function ( x ) {
29
30 this.x = x;
31
32 return this;
33
34 },
35
36 setY: function ( y ) {
37
38 this.y = y;
39
40 return this;
41
42 },
43
44
45 setComponent: function ( index, value ) {
46
47 switch ( index ) {
48
49 case 0: this.x = value; break;
50 case 1: this.y = value; break;
51 default: throw new Error( "index is out of range: " + index );
52
53 }
54
55 },
56
57 getComponent: function ( index ) {
58
59 switch ( index ) {
60
61 case 0: return this.x;
62 case 1: return this.y;
63 default: throw new Error( "index is out of range: " + index );
64
65 }
66
67 },
68
69 copy: function ( v ) {
70
71 this.x = v.x;
72 this.y = v.y;
73
74 return this;
75
76 },
77
78 add: function ( v, w ) {
79
80 if ( w !== undefined ) {
81
82 console.warn( 'DEPRECATED: Vector2\'s .add() now only accepts one argument. Use .addVectors( a, b ) instead.' );
83 return this.addVectors( v, w );
84
85 }
86
87 this.x += v.x;
88 this.y += v.y;
89
90 return this;
91
92 },
93
94 addVectors: function ( a, b ) {
95
96 this.x = a.x + b.x;
97 this.y = a.y + b.y;
98
99 return this;
100
101 },
102
103 addScalar: function ( s ) {
104
105 this.x += s;
106 this.y += s;
107
108 return this;
109
110 },
111
112 sub: function ( v, w ) {
113
114 if ( w !== undefined ) {
115
116 console.warn( 'DEPRECATED: Vector2\'s .sub() now only accepts one argument. Use .subVectors( a, b ) instead.' );
117 return this.subVectors( v, w );
118
119 }
120
121 this.x -= v.x;
122 this.y -= v.y;
123
124 return this;
125
126 },
127
128 subVectors: function ( a, b ) {
129
130 this.x = a.x - b.x;
131 this.y = a.y - b.y;
132
133 return this;
134
135 },
136
137 multiplyScalar: function ( s ) {
138
139 this.x *= s;
140 this.y *= s;
141
142 return this;
143
144 },
145
146 divideScalar: function ( scalar ) {
147
148 if ( scalar !== 0 ) {
149
150 var invScalar = 1 / scalar;
151
152 this.x *= invScalar;
153 this.y *= invScalar;
154
155 } else {
156
157 this.x = 0;
158 this.y = 0;
159
160 }
161
162 return this;
163
164 },
165
166 min: function ( v ) {
167
168 if ( this.x > v.x ) {
169
170 this.x = v.x;
171
172 }
173
174 if ( this.y > v.y ) {
175
176 this.y = v.y;
177
178 }
179
180 return this;
181
182 },
183
184 max: function ( v ) {
185
186 if ( this.x < v.x ) {
187
188 this.x = v.x;
189
190 }
191
192 if ( this.y < v.y ) {
193
194 this.y = v.y;
195
196 }
197
198 return this;
199
200 },
201
202 clamp: function ( min, max ) {
203
204 // This function assumes min < max, if this assumption isn't true it will not operate correctly
205
206 if ( this.x < min.x ) {
207
208 this.x = min.x;
209
210 } else if ( this.x > max.x ) {
211
212 this.x = max.x;
213
214 }
215
216 if ( this.y < min.y ) {
217
218 this.y = min.y;
219
220 } else if ( this.y > max.y ) {
221
222 this.y = max.y;
223
224 }
225
226 return this;
227
228 },
229
230 negate: function() {
231
232 return this.multiplyScalar( - 1 );
233
234 },
235
236 dot: function ( v ) {
237
238 return this.x * v.x + this.y * v.y;
239
240 },
241
242 lengthSq: function () {
243
244 return this.x * this.x + this.y * this.y;
245
246 },
247
248 length: function () {
249
250 return Math.sqrt( this.x * this.x + this.y * this.y );
251
252 },
253
254 normalize: function () {
255
256 return this.divideScalar( this.length() );
257
258 },
259
260 distanceTo: function ( v ) {
261
262 return Math.sqrt( this.distanceToSquared( v ) );
263
264 },
265
266 distanceToSquared: function ( v ) {
267
268 var dx = this.x - v.x, dy = this.y - v.y;
269 return dx * dx + dy * dy;
270
271 },
272
273 setLength: function ( l ) {
274
275 var oldLength = this.length();
276
277 if ( oldLength !== 0 && l !== oldLength ) {
278
279 this.multiplyScalar( l / oldLength );
280 }
281
282 return this;
283
284 },
285
286 lerp: function ( v, alpha ) {
287
288 this.x += ( v.x - this.x ) * alpha;
289 this.y += ( v.y - this.y ) * alpha;
290
291 return this;
292
293 },
294
295 equals: function( v ) {
296
297 return ( ( v.x === this.x ) && ( v.y === this.y ) );
298
299 },
300
301 fromArray: function ( array ) {
302
303 this.x = array[ 0 ];
304 this.y = array[ 1 ];
305
306 return this;
307
308 },
309
310 toArray: function () {
311
312 return [ this.x, this.y ];
313
314 },
315
316 clone: function () {
317
318 return new THREE.Vector2( this.x, this.y );
319
320 }
321
322};
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