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2026-08-16 00:02:12 +02:00 · 2009-07-26 15:46:49 +02:00
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+/**
+* Copyright (c) 2006-2009 LOVE Development Team
+* 
+* 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 as such, and must not be
+*    misrepresented as being the original software.
+* 3. This notice may not be removed or altered from any source distribution.
+**/
+
+#ifndef LOVE_PHYSICS_BOX2D_PULLEY_JOINT_H
+#define LOVE_PHYSICS_BOX2D_PULLEY_JOINT_H
+
+// Module
+#include "Joint.h"
+
+namespace love
+{
+namespace physics
+{
+namespace box2d
+{
+	/**
+	* The PulleyJoint The pulley connects two bodies to ground and 
+	* to each other. As one body goes up, the other goes down. The 
+	* total length of the pulley rope is conserved according to the 
+	* initial configuration: length1 + ratio * length2 <= constant.
+	**/
+	class PulleyJoint : public Joint
+	{
+	private:
+		// The Box2D DistanceJoint object.
+		b2PulleyJoint * joint;
+	public:
+
+		/**
+		* Creates a PulleyJoint connecting body1 to body2. 
+		**/
+		PulleyJoint(Body * body1, Body * body2, b2Vec2 groundAnchor1, b2Vec2 groundAnchor2, b2Vec2 anchor1, b2Vec2 anchor2, float ratio);
+		
+		virtual ~PulleyJoint();
+		
+		/**
+		* Gets the ground anchors position in world
+		* coordinates.
+		**/
+		int getGroundAnchors(lua_State * L);
+		
+		/**
+		* Sets the max rope lengths (a value of zero keeps it
+		* unchanged). Beware that Box2D also imposes a maximum,
+		* so the smallest of these is actually set.
+		**/
+		void setMaxLengths(float maxlength1, float maxlength2);
+		
+		/**
+		* Gets the max rope lengths.
+		**/
+		int getMaxLengths(lua_State * L);
+				
+		/**
+		* Sets the total length of the rope and updates the 
+		* MaxLengths values accordingly.
+		**/
+		void setConstant(float length);
+		
+		/**
+		* Gets the total length of the rope.
+		**/
+		float getConstant() const;
+		
+		/**
+		* Gets the current length of the segment attached to body1.
+		**/
+		float getLength1() const;
+	
+		/**
+		* Gets the current length of the segment attached to body2.
+		**/
+		float getLength2() const;
+		
+		/**
+		* Sets the pulley ratio.
+		**/
+		void setRatio(float ratio);
+		
+		/**
+		* Gets the pulley ratio.
+		**/
+		float getRatio() const;
+		
+	};
+
+} // box2d
+} // physics
+} // love
+
+#endif // LOVE_PHYSICS_BOX2D_PULLEY_JOINT_H