PyramidTest.java

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 * Copyright (c) 2013, Daniel Murphy
 * All rights reserved.
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/**
 * Created at 5:36:06 PM Jul 17, 2010
 */
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.testbed.framework.TestbedTest;

/**
 * @author Daniel Murphy
 */
public class PyramidTest extends TestbedTest {

  @Override
  public boolean isSaveLoadEnabled() {
    return true;
  }

  @Override
  public void initTest(boolean deserialized) {
    if (deserialized) {
      return;
    }
    int count = 20;
    {
      BodyDef bd = new BodyDef();
      Body ground = getWorld().createBody(bd);

      EdgeShape shape = new EdgeShape();
      shape.set(new Vec2(-40.0f, 0f), new Vec2(40.0f, 0f));
      ground.createFixture(shape, 0.0f);

    }

    {
      float a = .5f;
      PolygonShape shape = new PolygonShape();
      shape.setAsBox(a, a);

      Vec2 x = new Vec2(-7.0f, 0.75f);
      Vec2 y = new Vec2();
      Vec2 deltaX = new Vec2(0.5625f, 1.25f);
      Vec2 deltaY = new Vec2(1.125f, 0.0f);

      for (int i = 0; i < count; ++i) {
        y.set(x);

        for (int j = i; j < count; ++j) {
          BodyDef bd = new BodyDef();
          bd.type = BodyType.DYNAMIC;
          bd.position.set(y);
          Body body = getWorld().createBody(bd);
          body.createFixture(shape, 5.0f);
          y.addLocal(deltaY);
        }

        x.addLocal(deltaX);
      }
    }
  }

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