132 lines
2.8 KiB
JavaScript
132 lines
2.8 KiB
JavaScript
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/*
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* Copyright (c) 2006-2007 Erin Catto http:
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked, and must not be
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* misrepresented the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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// b2Vec2 has no constructor so that it
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// can be placed in a union.
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var b2Vec2 = Class.create();
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b2Vec2.prototype =
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{
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initialize: function(x_, y_) {this.x=x_; this.y=y_;},
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SetZero: function() { this.x = 0.0; this.y = 0.0; },
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Set: function(x_, y_) {this.x=x_; this.y=y_;},
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SetV: function(v) {this.x=v.x; this.y=v.y;},
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Negative: function(){ return new b2Vec2(-this.x, -this.y); },
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Copy: function(){
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return new b2Vec2(this.x,this.y);
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},
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Add: function(v)
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{
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this.x += v.x; this.y += v.y;
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},
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Subtract: function(v)
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{
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this.x -= v.x; this.y -= v.y;
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},
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Multiply: function(a)
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{
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this.x *= a; this.y *= a;
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},
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MulM: function(A)
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{
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var tX = this.x;
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this.x = A.col1.x * tX + A.col2.x * this.y;
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this.y = A.col1.y * tX + A.col2.y * this.y;
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},
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MulTM: function(A)
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{
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var tX = b2Math.b2Dot(this, A.col1);
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this.y = b2Math.b2Dot(this, A.col2);
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this.x = tX;
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},
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CrossVF: function(s)
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{
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var tX = this.x;
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this.x = s * this.y;
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this.y = -s * tX;
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},
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CrossFV: function(s)
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{
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var tX = this.x;
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this.x = -s * this.y;
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this.y = s * tX;
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},
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MinV: function(b)
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{
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this.x = this.x < b.x ? this.x : b.x;
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this.y = this.y < b.y ? this.y : b.y;
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},
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MaxV: function(b)
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{
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this.x = this.x > b.x ? this.x : b.x;
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this.y = this.y > b.y ? this.y : b.y;
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},
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Abs: function()
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{
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this.x = Math.abs(this.x);
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this.y = Math.abs(this.y);
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},
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Length: function()
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{
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return Math.sqrt(this.x * this.x + this.y * this.y);
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},
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Normalize: function()
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{
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var length = this.Length();
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if (length < Number.MIN_VALUE)
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{
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return 0.0;
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}
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var invLength = 1.0 / length;
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this.x *= invLength;
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this.y *= invLength;
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return length;
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},
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IsValid: function()
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{
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return b2Math.b2IsValid(this.x) && b2Math.b2IsValid(this.y);
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},
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x: null,
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y: null};
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b2Vec2.Make = function(x_, y_)
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{
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return new b2Vec2(x_, y_);
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};
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