/*
* Copyright (c) 2006-2007 Erin Catto http:
*
* This software is provided 'as-is', without any express or implied
* warranty.  In no event will the authors be held liable for any damages
* arising from the use of this software.
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked, and must not be
* misrepresented the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/




/**
 * @class b2Jacobian
 * @constructor
 */
var b2Jacobian = function () {
    // initialize instance variables for references
	this.linear1 = new b2Vec2();
	this.linear2 = new b2Vec2();
	//
};
b2Jacobian.prototype = 
{
	linear1: new b2Vec2(),
	angular1: null,
	linear2: new b2Vec2(),
	angular2: null,

	SetZero: function(){
		this.linear1.SetZero(); this.angular1 = 0.0;
		this.linear2.SetZero(); this.angular2 = 0.0;
	},
	Set: function(x1, a1, x2, a2){
		this.linear1.SetV(x1); this.angular1 = a1;
		this.linear2.SetV(x2); this.angular2 = a2;
	},
	Compute: function(x1, a1, x2, a2){

		//return b2Math.b2Dot(this.linear1, x1) + this.angular1 * a1 + b2Math.b2Dot(this.linear2, x2) + this.angular2 * a2;
		return (this.linear1.x*x1.x + this.linear1.y*x1.y) + this.angular1 * a1 + (this.linear2.x*x2.x + this.linear2.y*x2.y) + this.angular2 * a2;
	}
};