DamBreak.java

package org.jbox2d.testbed.tests;

import org.jbox2d.collision.shapes.ChainShape;
import org.jbox2d.collision.shapes.PolygonShape;
import org.jbox2d.common.Vec2;
import org.jbox2d.dynamics.Body;
import org.jbox2d.dynamics.BodyDef;
import org.jbox2d.particle.ParticleGroupDef;
import org.jbox2d.testbed.framework.TestbedTest;

public class DamBreak extends TestbedTest {

  @Override
  public void initTest(boolean deserialized) {
    {
      BodyDef bd = new BodyDef();
      Body ground = m_world.createBody(bd);

      ChainShape shape = new ChainShape();
      Vec2[] vertices =
          new Vec2[] {new Vec2(-20, 0), new Vec2(20, 0), new Vec2(20, 40), new Vec2(-20, 40)};
      shape.createLoop(vertices, 4);
      ground.createFixture(shape, 0.0f);

    }

    m_world.setParticleRadius(0.15f);
    m_world.setParticleDamping(0.2f);
    {
      PolygonShape shape = new PolygonShape();
      shape.setAsBox(8, 10, new Vec2(-12, 10.1f), 0);
      ParticleGroupDef pd = new ParticleGroupDef();
      pd.shape = shape;
      m_world.createParticleGroup(pd);
    }
  }

  @Override
  public String getTestName() {
    return "Dam Break";
  }
}