mirror of
https://github.com/love2d/love.git
synced 2026-08-15 15:51:12 +02:00
Bill Meltsner
109 lines
2.8 KiB
C++
109 lines
2.8 KiB
C++
/**
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* Copyright (c) 2006-2011 LOVE Development Team
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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**/
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#ifndef LOVE_PHYSICS_BOX2D_PULLEY_JOINT_H
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#define LOVE_PHYSICS_BOX2D_PULLEY_JOINT_H
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// Module
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#include "Joint.h"
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namespace love
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{
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namespace physics
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{
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namespace box2d
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{
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/**
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* The PulleyJoint The pulley connects two bodies to ground and
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* to each other. As one body goes up, the other goes down. The
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* total length of the pulley rope is conserved according to the
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* initial configuration: length1 + ratio * length2 <= constant.
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**/
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class PulleyJoint : public Joint
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{
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private:
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// The Box2D DistanceJoint object.
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b2PulleyJoint * joint;
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public:
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/**
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* Creates a PulleyJoint connecting body1 to body2.
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**/
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PulleyJoint(Body * body1, Body * body2, b2Vec2 groundAnchor1, b2Vec2 groundAnchor2, b2Vec2 anchor1, b2Vec2 anchor2, float ratio);
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virtual ~PulleyJoint();
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/**
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* Gets the ground anchors position in world
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* coordinates.
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**/
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int getGroundAnchors(lua_State * L);
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/**
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* Sets the max rope lengths (a value of zero keeps it
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* unchanged). Beware that Box2D also imposes a maximum,
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* so the smallest of these is actually set.
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**/
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void setMaxLengths(float maxlength1, float maxlength2);
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/**
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* Gets the max rope lengths.
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**/
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int getMaxLengths(lua_State * L);
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/**
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* Sets the total length of the rope and updates the
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* MaxLengths values accordingly.
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**/
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void setConstant(float length);
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/**
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* Gets the total length of the rope.
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**/
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float getConstant() const;
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/**
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* Gets the current length of the segment attached to body1.
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**/
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float getLength1() const;
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/**
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* Gets the current length of the segment attached to body2.
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**/
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float getLength2() const;
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/**
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* Sets the pulley ratio.
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**/
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void setRatio(float ratio);
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/**
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* Gets the pulley ratio.
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**/
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float getRatio() const;
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};
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} // box2d
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} // physics
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} // love
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#endif // LOVE_PHYSICS_BOX2D_PULLEY_JOINT_H
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