/*******************************************************************************
* Copyright (c) 2011, Daniel Murphy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, 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.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the <organization> nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL DANIEL MURPHY BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
******************************************************************************/
/**
* Created at 2:10:11 PM Jan 23, 2011
*/
package org.jbox2d.gwt.showcase.client.example;
import java.util.List;
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.gwt.showcase.client.framework.BaseExample;
import org.jbox2d.gwt.showcase.client.framework.ShowcaseSettings;
/**
* @author Daniel Murphy
*/
public class Web extends BaseExample {
Body m_bodies[] = new Body[4];
Joint m_joints[] = new Joint[8];
/**
* @see org.jbox2d.testbed.framework.TestbedTest#initTest()
*/
@Override
public void initTest() {
Body ground = null;
{
BodyDef bd = new BodyDef();
ground = m_world.createBody(bd);
PolygonShape shape = new PolygonShape();
shape.setAsEdge(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] = m_world.createBody(bd);
m_bodies[0].createFixture(shape, 5.0f);
bd.position.set(5.0f, 5.0f);
m_bodies[1] = m_world.createBody(bd);
m_bodies[1].createFixture(shape, 5.0f);
bd.position.set(5.0f, 15.0f);
m_bodies[2] = m_world.createBody(bd);
m_bodies[2].createFixture(shape, 5.0f);
bd.position.set(-5.0f, 15.0f);
m_bodies[3] = m_world.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] = m_world.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] = m_world.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] = m_world.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] = m_world.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] = m_world.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] = m_world.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] = m_world.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] = m_world.createJoint(jd);
}
}
/**
* @see org.jbox2d.testbed.framework.TestbedTest#keyPressed(char, int)
*/
@Override
public void keyPressed(char key, int argKeyCode, ShowcaseSettings settings) {
switch (key) {
case 'b' :
for (int i = 0; i < 4; ++i) {
if (m_bodies[i] != null) {
m_world.destroyBody(m_bodies[i]);
m_bodies[i] = null;
break;
}
}
break;
case 'j' :
for (int i = 0; i < 8; ++i) {
if (m_joints[i] != null) {
m_world.destroyJoint(m_joints[i]);
m_joints[i] = null;
break;
}
}
break;
}
}
@Override
public List<String> getInstructions() {
List<String> instructions = super.getInstructions();
instructions.add("This demonstrates a soft distance joint.");
instructions.add("Press: (b) to delete a body, (j) to delete a joint");
return instructions;
}
public void jointDestroyed(Joint joint) {
for (int i = 0; i < 8; ++i) {
if (m_joints[i] == joint) {
m_joints[i] = null;
break;
}
}
}
/**
* @see org.jbox2d.testbed.framework.TestbedTest#getTestName()
*/
@Override
public String getTestName() {
return "Web";
}
}