text: //
  // Copyright (c) 2008-2014 the Urho3D project.
  //
  // 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.
  //
  
  #pragma once
  
  #include "Constraint2D.h"
  
  namespace Urho3D
  {
  
  /// 2D gear constraint component.
  class URHO3D_API ConstraintGear2D : public Constraint2D
  {
      OBJECT(ConstraintGear2D);
  
  public:
      /// Construct.
      ConstraintGear2D(Context* scontext);
      /// Destruct.
      virtual ~ConstraintGear2D();
      /// Register object factory.
      static void RegisterObject(Context* context);
  
      /// Set owner constraint.
      void SetOwnerConstraint(Constraint2D* constraint);
      /// Set other constraint.
      void SetOtherConstraint(Constraint2D* constraint);
      /// Set ratio.
      void SetRatio(float ratio);
  
      /// Return owner constraint.
      Constraint2D* GetOwnerConstraint() const { return ownerConstraint_; }
      /// Return other constraint.
      Constraint2D* GetOtherConstraint() const { return otherConstraint_; }
      /// Return ratio.
      float GetRatio() const { return jointDef_.ratio; }
  
  private:
      /// Return joint def.
      virtual b2JointDef* GetJointDef();
  
      /// Box2D joint def.
      b2GearJointDef jointDef_;
      /// Owner body constraint.
      WeakPtr<Constraint2D> ownerConstraint_;
      /// Other body constraint.
      WeakPtr<Constraint2D> otherConstraint_;
  };
  
  }
  