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/usr/include/chipmunk/constraints/cpPinJoint.h is in chipmunk-dev 6.1.5-1build1.

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/* Copyright (c) 2007 Scott Lembcke
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
 
/// @defgroup cpPinJoint cpPinJoint
/// @{

const cpConstraintClass *cpPinJointGetClass(void);

/// @private
typedef struct cpPinJoint {
	cpConstraint constraint;
	cpVect anchr1, anchr2;
	cpFloat dist;
	
	cpVect r1, r2;
	cpVect n;
	cpFloat nMass;
	
	cpFloat jnAcc;
	cpFloat bias;
} cpPinJoint;

/// Allocate a pin joint.
cpPinJoint* cpPinJointAlloc(void);
/// Initialize a pin joint.
cpPinJoint* cpPinJointInit(cpPinJoint *joint, cpBody *a, cpBody *b, cpVect anchr1, cpVect anchr2);
/// Allocate and initialize a pin joint.
cpConstraint* cpPinJointNew(cpBody *a, cpBody *b, cpVect anchr1, cpVect anchr2);

CP_DefineConstraintProperty(cpPinJoint, cpVect, anchr1, Anchr1)
CP_DefineConstraintProperty(cpPinJoint, cpVect, anchr2, Anchr2)
CP_DefineConstraintProperty(cpPinJoint, cpFloat, dist, Dist)

///@}