love2d.love/src/modules/physics/box2d/DistanceJoint.cpp

/**
 * Copyright (c) 2006-2020 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 "DistanceJoint.h"

// Module
#include "Body.h"
#include "World.h"
#include "Physics.h"

namespace love
{
namespace physics
{
namespace box2d
{

DistanceJoint::DistanceJoint(Body *body1, Body *body2, float x1, float y1, float x2, float y2, bool collideConnected)
	: Joint(body1, body2)
	, joint(NULL)
{
	b2DistanceJointDef def;
	def.Initialize(body1->body, body2->body, Physics::scaleDown(b2Vec2(x1,y1)), Physics::scaleDown(b2Vec2(x2,y2)));
	def.collideConnected = collideConnected;
	joint = (b2DistanceJoint *)createJoint(&def);
}

DistanceJoint::~DistanceJoint()
{
}

void DistanceJoint::setLength(float length)
{
	joint->SetLength(Physics::scaleDown(length));
}

float DistanceJoint::getLength() const
{
	return Physics::scaleUp(joint->GetLength());
}

void DistanceJoint::setStiffness(float hz)
{
	joint->SetStiffness(hz);
}

float DistanceJoint::getStiffness() const
{
	return joint->GetStiffness();
}

void DistanceJoint::setDamping(float d)
{
	joint->SetDamping(d);
}

float DistanceJoint::getDamping() const
{
	return joint->GetDamping();
}


} // box2d
} // physics
} // love