/*******************************************************************************
* Copyright (c) 2013, Daniel Murphy
* All rights reserved.
*
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* are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
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*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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******************************************************************************/
/**
* Created at 12:46:04 PM Jan 23, 2011
*/
package org.jbox2d.testbed.tests;
import org.jbox2d.collision.shapes.CircleShape;
import org.jbox2d.collision.shapes.EdgeShape;
import org.jbox2d.collision.shapes.PolygonShape;
import org.jbox2d.common.Vec2;
import org.jbox2d.dynamics.Body;
import org.jbox2d.dynamics.BodyDef;
import org.jbox2d.dynamics.BodyType;
import org.jbox2d.dynamics.joints.Joint;
import org.jbox2d.dynamics.joints.PulleyJoint;
import org.jbox2d.dynamics.joints.PulleyJointDef;
import org.jbox2d.testbed.framework.TestbedSettings;
import org.jbox2d.testbed.framework.TestbedTest;
/**
* @author Daniel Murphy
*/
public class Pulleys extends TestbedTest {
private static final long JOINT_TAG = 2;
PulleyJoint m_joint1;
@Override
public Long getTag(Joint joint) {
if (joint == m_joint1)
return JOINT_TAG;
return super.getTag(joint);
}
@Override
public void processJoint(Joint joint, Long tag) {
if (tag == JOINT_TAG) {
m_joint1 = (PulleyJoint) joint;
} else {
super.processJoint(joint, tag);
}
}
@Override
public boolean isSaveLoadEnabled() {
return true;
}
@Override
public void initTest(boolean deserialized) {
if (deserialized) {
return;
}
float y = 16.0f;
float L = 12.0f;
float a = 1.0f;
float b = 2.0f;
Body ground = null;
{
BodyDef bd = new BodyDef();
ground = getWorld().createBody(bd);
EdgeShape shape = new EdgeShape();
shape.set(new Vec2(-40.0f, 0.0f), new Vec2(40.0f, 0.0f));
ground.createFixture(shape, 0.0f);
CircleShape circle = new CircleShape();
circle.m_radius = 2.0f;
circle.m_p.set(-10.0f, y + b + L);
ground.createFixture(circle, 0.0f);
circle.m_p.set(10.0f, y + b + L);
ground.createFixture(circle, 0.0f);
}
{
PolygonShape shape = new PolygonShape();
shape.setAsBox(a, b);
BodyDef bd = new BodyDef();
bd.type = BodyType.DYNAMIC;
bd.position.set(-10.0f, y);
Body body1 = getWorld().createBody(bd);
body1.createFixture(shape, 5.0f);
bd.position.set(10.0f, y);
Body body2 = getWorld().createBody(bd);
body2.createFixture(shape, 5.0f);
PulleyJointDef pulleyDef = new PulleyJointDef();
Vec2 anchor1 = new Vec2(-10.0f, y + b);
Vec2 anchor2 = new Vec2(10.0f, y + b);
Vec2 groundAnchor1 = new Vec2(-10.0f, y + b + L);
Vec2 groundAnchor2 = new Vec2(10.0f, y + b + L);
pulleyDef.initialize(body1, body2, groundAnchor1, groundAnchor2, anchor1, anchor2, 2.0f);
m_joint1 = (PulleyJoint) getWorld().createJoint(pulleyDef);
}
}
@Override
public void step(TestbedSettings settings) {
super.step(settings);
float ratio = m_joint1.getRatio();
float L = m_joint1.getLength1() + ratio * m_joint1.getLength2();
addTextLine("L1 + " + ratio + " * L2 = " + L);
if (L >= 36) {
addTextLine("Pulley is taught");
}
}
@Override
public String getTestName() {
return "Pulleys";
}
}