text: /* Copyright (c) 2013 Scott Lembcke and Howling Moon Software
   * 
   * 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 cpSimpleMotor cpSimpleMotor
  /// @{
  
  /// Opaque struct type for damped rotary springs.
  typedef struct cpSimpleMotor cpSimpleMotor;
  
  /// Check if a constraint is a damped rotary springs.
  cpBool cpConstraintIsSimpleMotor(const cpConstraint *constraint);
  
  /// Allocate a simple motor.
  cpSimpleMotor* cpSimpleMotorAlloc(void);
  /// initialize a simple motor.
  cpSimpleMotor* cpSimpleMotorInit(cpSimpleMotor *joint, cpBody *a, cpBody *b, cpFloat rate);
  /// Allocate and initialize a simple motor.
  cpConstraint* cpSimpleMotorNew(cpBody *a, cpBody *b, cpFloat rate);
  
  /// Get the rate of the motor.
  cpFloat cpSimpleMotorGetRate(const cpConstraint *constraint);
  /// Set the rate of the motor.
  void cpSimpleMotorSetRate(cpConstraint *constraint, cpFloat rate);
  
  /// @}
  