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* 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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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* POSSIBILITY OF SUCH DAMAGE.
******************************************************************************/
/**
* Created at 2:10:11 PM Jan 23, 2011
*/
package org.jbox2d.testbed.tests;
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.DistanceJointDef;
import org.jbox2d.dynamics.joints.Joint;
import org.jbox2d.testbed.framework.TestbedSettings;
import org.jbox2d.testbed.framework.TestbedTest;
/**
* @author Daniel Murphy
*/
public class Web extends TestbedTest {
Body m_bodies[] = new Body[4];
Joint m_joints[] = new Joint[8];
@Override
public void initTest(boolean argDeserialized) {
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);
}
{
PolygonShape shape = new PolygonShape();
shape.setAsBox(0.5f, 0.5f);
BodyDef bd = new BodyDef();
bd.type = BodyType.DYNAMIC;
bd.position.set(-5.0f, 5.0f);
m_bodies[0] = getWorld().createBody(bd);
m_bodies[0].createFixture(shape, 5.0f);
bd.position.set(5.0f, 5.0f);
m_bodies[1] = getWorld().createBody(bd);
m_bodies[1].createFixture(shape, 5.0f);
bd.position.set(5.0f, 15.0f);
m_bodies[2] = getWorld().createBody(bd);
m_bodies[2].createFixture(shape, 5.0f);
bd.position.set(-5.0f, 15.0f);
m_bodies[3] = getWorld().createBody(bd);
m_bodies[3].createFixture(shape, 5.0f);
DistanceJointDef jd = new DistanceJointDef();
Vec2 p1 = new Vec2();
Vec2 p2 = new Vec2();
Vec2 d = new Vec2();
jd.frequencyHz = 4.0f;
jd.dampingRatio = 0.5f;
jd.bodyA = ground;
jd.bodyB = m_bodies[0];
jd.localAnchorA.set(-10.0f, 0.0f);
jd.localAnchorB.set(-0.5f, -0.5f);
p1 = jd.bodyA.getWorldPoint(jd.localAnchorA);
p2 = jd.bodyB.getWorldPoint(jd.localAnchorB);
d = p2.sub(p1);
jd.length = d.length();
m_joints[0] = getWorld().createJoint(jd);
jd.bodyA = ground;
jd.bodyB = m_bodies[1];
jd.localAnchorA.set(10.0f, 0.0f);
jd.localAnchorB.set(0.5f, -0.5f);
p1 = jd.bodyA.getWorldPoint(jd.localAnchorA);
p2 = jd.bodyB.getWorldPoint(jd.localAnchorB);
d = p2.sub(p1);
jd.length = d.length();
m_joints[1] = getWorld().createJoint(jd);
jd.bodyA = ground;
jd.bodyB = m_bodies[2];
jd.localAnchorA.set(10.0f, 20.0f);
jd.localAnchorB.set(0.5f, 0.5f);
p1 = jd.bodyA.getWorldPoint(jd.localAnchorA);
p2 = jd.bodyB.getWorldPoint(jd.localAnchorB);
d = p2.sub(p1);
jd.length = d.length();
m_joints[2] = getWorld().createJoint(jd);
jd.bodyA = ground;
jd.bodyB = m_bodies[3];
jd.localAnchorA.set(-10.0f, 20.0f);
jd.localAnchorB.set(-0.5f, 0.5f);
p1 = jd.bodyA.getWorldPoint(jd.localAnchorA);
p2 = jd.bodyB.getWorldPoint(jd.localAnchorB);
d = p2.sub(p1);
jd.length = d.length();
m_joints[3] = getWorld().createJoint(jd);
jd.bodyA = m_bodies[0];
jd.bodyB = m_bodies[1];
jd.localAnchorA.set(0.5f, 0.0f);
jd.localAnchorB.set(-0.5f, 0.0f);;
p1 = jd.bodyA.getWorldPoint(jd.localAnchorA);
p2 = jd.bodyB.getWorldPoint(jd.localAnchorB);
d = p2.sub(p1);
jd.length = d.length();
m_joints[4] = getWorld().createJoint(jd);
jd.bodyA = m_bodies[1];
jd.bodyB = m_bodies[2];
jd.localAnchorA.set(0.0f, 0.5f);
jd.localAnchorB.set(0.0f, -0.5f);
p1 = jd.bodyA.getWorldPoint(jd.localAnchorA);
p2 = jd.bodyB.getWorldPoint(jd.localAnchorB);
d = p2.sub(p1);
jd.length = d.length();
m_joints[5] = getWorld().createJoint(jd);
jd.bodyA = m_bodies[2];
jd.bodyB = m_bodies[3];
jd.localAnchorA.set(-0.5f, 0.0f);
jd.localAnchorB.set(0.5f, 0.0f);
p1 = jd.bodyA.getWorldPoint(jd.localAnchorA);
p2 = jd.bodyB.getWorldPoint(jd.localAnchorB);
d = p2.sub(p1);
jd.length = d.length();
m_joints[6] = getWorld().createJoint(jd);
jd.bodyA = m_bodies[3];
jd.bodyB = m_bodies[0];
jd.localAnchorA.set(0.0f, -0.5f);
jd.localAnchorB.set(0.0f, 0.5f);
p1 = jd.bodyA.getWorldPoint(jd.localAnchorA);
p2 = jd.bodyB.getWorldPoint(jd.localAnchorB);
d = p2.sub(p1);
jd.length = d.length();
m_joints[7] = getWorld().createJoint(jd);
}
}
@Override
public void keyPressed(char key, int argKeyCode) {
switch (key) {
case 'b':
for (int i = 0; i < 4; ++i) {
if (m_bodies[i] != null) {
getWorld().destroyBody(m_bodies[i]);
m_bodies[i] = null;
break;
}
}
break;
case 'j':
for (int i = 0; i < 8; ++i) {
if (m_joints[i] != null) {
getWorld().destroyJoint(m_joints[i]);
m_joints[i] = null;
break;
}
}
break;
}
}
@Override
public void step(TestbedSettings settings) {
super.step(settings);
addTextLine("This demonstrates a soft distance joint.");
addTextLine("Press: (b) to delete a body, (j) to delete a joint");
}
public void jointDestroyed(Joint joint) {
for (int i = 0; i < 8; ++i) {
if (m_joints[i] == joint) {
m_joints[i] = null;
break;
}
}
}
@Override
public String getTestName() {
return "Web";
}
}