BlobTest4.java

/*******************************************************************************
 * 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:
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 *       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
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 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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/*
 * JBox2D - A Java Port of Erin Catto's Box2D
 * 
 * JBox2D homepage: http://jbox2d.sourceforge.net/ 
 * Box2D homepage: http://www.box2d.org
 * 
 * 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.
 */

package org.jbox2d.gwt.showcase.client.example;

import org.jbox2d.collision.shapes.CircleShape;
import org.jbox2d.collision.shapes.PolygonShape;
import org.jbox2d.common.MathUtils;
import org.jbox2d.common.Vec2;
import org.jbox2d.dynamics.Body;
import org.jbox2d.dynamics.BodyDef;
import org.jbox2d.dynamics.BodyType;
import org.jbox2d.dynamics.FixtureDef;
import org.jbox2d.dynamics.joints.ConstantVolumeJointDef;
import org.jbox2d.gwt.showcase.client.framework.BaseExample;

public class BlobTest4 extends BaseExample {
	private boolean firstTime = true;
	
	@Override
	public void initTest() {

		if (firstTime) {
			setCamera(0.0f,10.0f,20.0f);
			firstTime = false;
		}
		
    	Body ground = null;
		{
			PolygonShape sd = new PolygonShape();
			sd.setAsBox(50.0f, 0.4f);

			BodyDef bd = new BodyDef();
			bd.position.set(0.0f, 0.0f);
			ground = m_world.createBody(bd);
			ground.createFixture(sd,0f);
			
			sd.setAsBox(0.4f,50.0f,new Vec2(-10.0f,0.0f), 0.0f);
			ground.createFixture(sd, 0f);
			sd.setAsBox(0.4f,50.0f,new Vec2(10.0f,0.0f), 0.0f);
			ground.createFixture(sd, 0f);
		}
		
		ConstantVolumeJointDef cvjd = new ConstantVolumeJointDef();
		
		float cx = 0.0f;
		float cy = 10.0f;
		float rx = 5.0f;
		float ry = 5.0f;
		int nBodies = 20;
		float bodyRadius = 0.5f;
		for (int i=0; i<nBodies; ++i) {
			float angle = MathUtils.map(i, 0, nBodies, 0, 2*3.1415f);
			BodyDef bd = new BodyDef();
			//bd.isBullet = true;
			bd.fixedRotation = true;
		
			float x = cx + rx * (float)Math.sin(angle);
			float y = cy + ry * (float)Math.cos(angle);
			bd.position.set(new Vec2(x,y));
			bd.type = BodyType.DYNAMIC;
			Body body = m_world.createBody(bd);
			
			FixtureDef fd = new FixtureDef();
			CircleShape cd = new CircleShape();
			cd.m_radius = bodyRadius;
			fd.shape = cd;
			fd.density = 1.0f;
			fd.filter.groupIndex = -2;
			body.createFixture(fd);
			cvjd.addBody(body);
		}

		cvjd.frequencyHz = 10.0f;
		cvjd.dampingRatio = 1.0f;
		m_world.createJoint(cvjd);
		
		BodyDef bd2 = new BodyDef();
		bd2.type = BodyType.DYNAMIC;
		PolygonShape psd = new PolygonShape();
		psd.setAsBox(3.0f,1.5f,new Vec2(cx,cy+15.0f),0.0f);
		bd2.position = new Vec2(cx,cy+15.0f);
		Body fallingBox = m_world.createBody(bd2);
		fallingBox.createFixture(psd,1.0f);
	}

	@Override
	public String getTestName() {
		return "Blob Joint";
	}

}