Initial Mercurial commit.

2026-08-15 15:51:12 +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.
+**/
+
+#include "PulleyJoint.h"
+
+// Module
+#include "Body.h"
+#include "World.h"
+
+namespace love
+{
+namespace physics
+{
+namespace box2d
+{
+	PulleyJoint::PulleyJoint(Body * body1, Body * body2, b2Vec2 groundAnchor1, b2Vec2 groundAnchor2, b2Vec2 anchor1, b2Vec2 anchor2, float ratio)
+		: Joint(body1, body2)
+	{
+		b2PulleyJointDef def;
+		def.Initialize(body1->body, body2->body, world->scaleDown(groundAnchor1), world->scaleDown(groundAnchor2), \
+			 world->scaleDown(anchor1), world->scaleDown(anchor2), ratio);
+		
+		joint = (b2PulleyJoint*)createJoint(&def);
+	}
+
+	PulleyJoint::~PulleyJoint()
+	{
+		destroyJoint(joint);
+		joint = 0;
+	}
+
+	int PulleyJoint::getGroundAnchors(lua_State * L)
+	{
+		lua_pushnumber(L, world->scaleUp(joint->GetGroundAnchor1().x));
+		lua_pushnumber(L, world->scaleUp(joint->GetGroundAnchor1().y));
+		lua_pushnumber(L, world->scaleUp(joint->GetGroundAnchor2().x));
+		lua_pushnumber(L, world->scaleUp(joint->GetGroundAnchor2().y));
+		return 4;
+	}
+	
+	void PulleyJoint::setMaxLengths(float maxlength1, float maxlength2)
+	{	
+		// Apply Box2D's maximum lengths too. They know better.
+		
+		if (maxlength1 > 0)
+		{
+			joint->m_maxLength1 = b2Min(world->scaleDown(maxlength1), joint->m_constant - joint->m_ratio * b2_minPulleyLength);
+		}
+		
+		if (maxlength2 > 0)
+		{
+			joint->m_maxLength2 = b2Min(world->scaleDown(maxlength2), (joint->m_constant - b2_minPulleyLength) / joint->m_ratio);
+		}
+	}
+	
+	int PulleyJoint::getMaxLengths(lua_State * L)
+	{
+		lua_pushnumber(L, world->scaleUp(joint->m_maxLength1));
+		lua_pushnumber(L, world->scaleUp(joint->m_maxLength2));
+		return 2;
+	}
+	
+	void PulleyJoint::setConstant(float constant)
+	{
+		joint->m_constant = world->scaleDown(constant);
+		
+		// Update the max lengths, as does Box2D
+		joint->m_maxLength1 = joint->m_constant - joint->m_ratio * b2_minPulleyLength;
+		joint->m_maxLength2 = (joint->m_constant - b2_minPulleyLength) / joint->m_ratio;
+	}
+	
+	float PulleyJoint::getConstant() const
+	{
+		return world->scaleUp(joint->m_constant);
+	}
+	
+	float PulleyJoint::getLength1() const
+	{
+		return world->scaleUp(joint->GetLength1());
+	}
+		
+	float PulleyJoint::getLength2() const
+	{
+		return world->scaleUp(joint->GetLength2());
+	}
+	
+	void PulleyJoint::setRatio(float ratio)
+	{
+		joint->m_ratio = ratio;
+	}
+	
+	float PulleyJoint::getRatio() const
+	{
+		return joint->m_ratio;
+	}
+
+} // box2d
+} // physics
+} // love