71 lines
2.3 KiB
JavaScript
71 lines
2.3 KiB
JavaScript
/*
|
|
* 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.
|
|
*/
|
|
|
|
|
|
|
|
|
|
|
|
|
|
// The pulley joint is connected to two bodies and two fixed ground points.
|
|
// The pulley supports a ratio such that:
|
|
// length1 + ratio * length2 = constant
|
|
// Yes, the force transmitted is scaled by the ratio.
|
|
// The pulley also enforces a maximum length limit on both sides. This is
|
|
// useful to prevent one side of the pulley hitting the top.
|
|
|
|
var b2PulleyJointDef = Class.create();
|
|
Object.extend(b2PulleyJointDef.prototype, b2JointDef.prototype);
|
|
Object.extend(b2PulleyJointDef.prototype,
|
|
{
|
|
initialize: function()
|
|
{
|
|
// The constructor for b2JointDef
|
|
this.type = b2Joint.e_unknownJoint;
|
|
this.userData = null;
|
|
this.body1 = null;
|
|
this.body2 = null;
|
|
this.collideConnected = false;
|
|
//
|
|
|
|
// initialize instance variables for references
|
|
this.groundPoint1 = new b2Vec2();
|
|
this.groundPoint2 = new b2Vec2();
|
|
this.anchorPoint1 = new b2Vec2();
|
|
this.anchorPoint2 = new b2Vec2();
|
|
//
|
|
|
|
this.type = b2Joint.e_pulleyJoint;
|
|
this.groundPoint1.Set(-1.0, 1.0);
|
|
this.groundPoint2.Set(1.0, 1.0);
|
|
this.anchorPoint1.Set(-1.0, 0.0);
|
|
this.anchorPoint2.Set(1.0, 0.0);
|
|
this.maxLength1 = 0.5 * b2PulleyJoint.b2_minPulleyLength;
|
|
this.maxLength2 = 0.5 * b2PulleyJoint.b2_minPulleyLength;
|
|
this.ratio = 1.0;
|
|
this.collideConnected = true;
|
|
},
|
|
|
|
groundPoint1: new b2Vec2(),
|
|
groundPoint2: new b2Vec2(),
|
|
anchorPoint1: new b2Vec2(),
|
|
anchorPoint2: new b2Vec2(),
|
|
maxLength1: null,
|
|
maxLength2: null,
|
|
ratio: null});
|
|
|