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https://github.com/love2d/love.git
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rude
117 lines
3.3 KiB
C++
117 lines
3.3 KiB
C++
/**
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* Copyright (c) 2006-2010 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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#include "PulleyJoint.h"
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// Module
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#include "Body.h"
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#include "World.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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PulleyJoint::PulleyJoint(Body * body1, Body * body2, b2Vec2 groundAnchor1, b2Vec2 groundAnchor2, b2Vec2 anchor1, b2Vec2 anchor2, float ratio)
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: Joint(body1, body2)
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{
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b2PulleyJointDef def;
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def.Initialize(body1->body, body2->body, world->scaleDown(groundAnchor1), world->scaleDown(groundAnchor2), \
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world->scaleDown(anchor1), world->scaleDown(anchor2), ratio);
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joint = (b2PulleyJoint*)createJoint(&def);
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}
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PulleyJoint::~PulleyJoint()
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{
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destroyJoint(joint);
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joint = 0;
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}
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int PulleyJoint::getGroundAnchors(lua_State * L)
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{
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lua_pushnumber(L, world->scaleUp(joint->GetGroundAnchor1().x));
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lua_pushnumber(L, world->scaleUp(joint->GetGroundAnchor1().y));
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lua_pushnumber(L, world->scaleUp(joint->GetGroundAnchor2().x));
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lua_pushnumber(L, world->scaleUp(joint->GetGroundAnchor2().y));
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return 4;
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}
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void PulleyJoint::setMaxLengths(float maxlength1, float maxlength2)
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{
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// Apply Box2D's maximum lengths too. They know better.
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if (maxlength1 > 0)
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{
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joint->m_maxLength1 = b2Min(world->scaleDown(maxlength1), joint->m_constant - joint->m_ratio * b2_minPulleyLength);
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}
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if (maxlength2 > 0)
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{
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joint->m_maxLength2 = b2Min(world->scaleDown(maxlength2), (joint->m_constant - b2_minPulleyLength) / joint->m_ratio);
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}
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}
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int PulleyJoint::getMaxLengths(lua_State * L)
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{
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lua_pushnumber(L, world->scaleUp(joint->m_maxLength1));
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lua_pushnumber(L, world->scaleUp(joint->m_maxLength2));
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return 2;
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}
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void PulleyJoint::setConstant(float constant)
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{
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joint->m_constant = world->scaleDown(constant);
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// Update the max lengths, as does Box2D
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joint->m_maxLength1 = joint->m_constant - joint->m_ratio * b2_minPulleyLength;
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joint->m_maxLength2 = (joint->m_constant - b2_minPulleyLength) / joint->m_ratio;
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}
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float PulleyJoint::getConstant() const
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{
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return world->scaleUp(joint->m_constant);
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}
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float PulleyJoint::getLength1() const
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{
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return world->scaleUp(joint->GetLength1());
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}
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float PulleyJoint::getLength2() const
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{
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return world->scaleUp(joint->GetLength2());
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}
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void PulleyJoint::setRatio(float ratio)
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{
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joint->m_ratio = ratio;
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}
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float PulleyJoint::getRatio() const
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{
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return joint->m_ratio;
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}
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} // box2d
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} // physics
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} // love
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