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

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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 cpDampedRotarySpring cpDampedRotarySpring
/// @{

typedef cpFloat (*cpDampedRotarySpringTorqueFunc)(struct cpConstraint *spring, cpFloat relativeAngle);

const cpConstraintClass *cpDampedRotarySpringGetClass(void);

/// @private
typedef struct cpDampedRotarySpring {
	cpConstraint constraint;
	cpFloat restAngle;
	cpFloat stiffness;
	cpFloat damping;
	cpDampedRotarySpringTorqueFunc springTorqueFunc;
	
	cpFloat target_wrn;
	cpFloat w_coef;
	
	cpFloat iSum;
	cpFloat jAcc;
} cpDampedRotarySpring;

/// Allocate a damped rotary spring.
cpDampedRotarySpring* cpDampedRotarySpringAlloc(void);
/// Initialize a damped rotary spring.
cpDampedRotarySpring* cpDampedRotarySpringInit(cpDampedRotarySpring *joint, cpBody *a, cpBody *b, cpFloat restAngle, cpFloat stiffness, cpFloat damping);
/// Allocate and initialize a damped rotary spring.
cpConstraint* cpDampedRotarySpringNew(cpBody *a, cpBody *b, cpFloat restAngle, cpFloat stiffness, cpFloat damping);

CP_DefineConstraintProperty(cpDampedRotarySpring, cpFloat, restAngle, RestAngle)
CP_DefineConstraintProperty(cpDampedRotarySpring, cpFloat, stiffness, Stiffness)
CP_DefineConstraintProperty(cpDampedRotarySpring, cpFloat, damping, Damping)
CP_DefineConstraintProperty(cpDampedRotarySpring, cpDampedRotarySpringTorqueFunc, springTorqueFunc, SpringTorqueFunc)

/// @}