CharacterCollision.java

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 * Copyright (c) 2011, Daniel Murphy
 * All rights reserved.
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 *       derived from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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/**
 * Created at 2:39:05 PM Jan 23, 2011
 */
package org.jbox2d.gwt.showcase.client.example;

import java.util.List;

import org.jbox2d.collision.shapes.CircleShape;
import org.jbox2d.collision.shapes.PolygonShape;
import org.jbox2d.common.MathUtils;
import org.jbox2d.common.Settings;
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.gwt.showcase.client.framework.BaseExample;

/**
 * @author Daniel Murphy
 */
public class CharacterCollision extends BaseExample {
	
	/**
	 * @see org.jbox2d.testbed.framework.TestbedTest#initTest()
	 */
	@Override
	public void initTest() {
		// Ground body
		{
			BodyDef bd = new BodyDef();
			Body ground = m_world.createBody(bd);

			PolygonShape shape = new PolygonShape();
			shape.setAsEdge(new Vec2(-20.0f, 0.0f), new Vec2(20.0f, 0.0f));
			ground.createFixture(shape, 0.0f);
		}

		// Collinear edges
		{
			BodyDef bd = new BodyDef();
			Body ground = m_world.createBody(bd);

			PolygonShape shape = new PolygonShape();
			shape.m_radius = 0.0f;
			shape.setAsEdge(new Vec2(-8.0f, 1.0f), new Vec2(-6.0f, 1.0f));
			ground.createFixture(shape, 0.0f);
			shape.setAsEdge(new Vec2(-6.0f, 1.0f), new Vec2(-4.0f, 1.0f));
			ground.createFixture(shape, 0.0f);
			shape.setAsEdge(new Vec2(-4.0f, 1.0f), new Vec2(-2.0f, 1.0f));
			ground.createFixture(shape, 0.0f);
		}

		// Square tiles
		{
			BodyDef bd = new BodyDef();
			Body ground = m_world.createBody(bd);

			PolygonShape shape = new PolygonShape();
			shape.setAsBox(1.0f, 1.0f, new Vec2(4.0f, 3.0f), 0.0f);
			ground.createFixture(shape, 0.0f);
			shape.setAsBox(1.0f, 1.0f, new Vec2(6.0f, 3.0f), 0.0f);
			ground.createFixture(shape, 0.0f);
			shape.setAsBox(1.0f, 1.0f, new Vec2(8.0f, 3.0f), 0.0f);
			ground.createFixture(shape, 0.0f);
		}

		// Square made from edges notice how the edges are shrunk to account
		// for the polygon radius. This makes it so the square character does
		// not get snagged. However, ray casts can now go through the cracks.
		{
			BodyDef bd = new BodyDef();
			Body ground = m_world.createBody(bd);

			PolygonShape shape = new PolygonShape();
			float d = 2.0f * Settings.polygonRadius;
			shape.setAsEdge(new Vec2(-1.0f + d, 3.0f), new Vec2(1.0f - d, 3.0f));
			ground.createFixture(shape, 0.0f);
			shape.setAsEdge(new Vec2(1.0f, 3.0f + d), new Vec2(1.0f, 5.0f - d));
			ground.createFixture(shape, 0.0f);
			shape.setAsEdge(new Vec2(1.0f - d, 5.0f), new Vec2(-1.0f + d, 5.0f));
			ground.createFixture(shape, 0.0f);
			shape.setAsEdge(new Vec2(-1.0f, 5.0f - d), new Vec2(-1.0f, 3.0f + d));
			ground.createFixture(shape, 0.0f);
		}

		// Square character
		{
			BodyDef bd = new BodyDef();
			bd.position.set(-3.0f, 5.0f);
			bd.type = BodyType.DYNAMIC;
			bd.fixedRotation = true;
			bd.allowSleep = false;

			Body body = m_world.createBody(bd);

			PolygonShape shape = new PolygonShape();
			shape.setAsBox(0.5f, 0.5f);

			FixtureDef fd = new FixtureDef();
			fd.shape = shape;
			fd.density = 20.0f;
			body.createFixture(fd);
		}

		// Hexagon character
		{
			BodyDef bd = new BodyDef();
			bd.position.set(-5.0f, 5.0f);
			bd.type = BodyType.DYNAMIC;
			bd.fixedRotation = true;
			bd.allowSleep = false;

			Body body = m_world.createBody(bd);

			float angle = 0.0f;
			float delta = MathUtils.PI / 3.0f;
			Vec2 vertices[] = new Vec2[6];
			for (int i = 0; i < 6; ++i)
			{
				vertices[i] = new Vec2(0.5f * MathUtils.cos(angle), 0.5f * MathUtils.sin(angle));
				angle += delta;
			}

			PolygonShape shape = new PolygonShape();
			shape.set(vertices, 6);

			FixtureDef fd = new FixtureDef();
			fd.shape = shape;
			fd.density = 20.0f;
			body.createFixture(fd);
		}

		// Circle character
		{
			BodyDef bd = new BodyDef();
			bd.position.set(3.0f, 5.0f);
			bd.type = BodyType.DYNAMIC;
			bd.fixedRotation = true;
			bd.allowSleep = false;

			Body body = m_world.createBody(bd);

			CircleShape shape = new CircleShape();
			shape.m_radius = 0.5f;

			FixtureDef fd = new FixtureDef();
			fd.shape = shape;
			fd.density = 20.0f;
			body.createFixture(fd);
		}
	}
	
  @Override
  public List<String> getInstructions() {
    List<String> instructions = super.getInstructions();
    instructions.add("This tests various character collision shapes");
    return instructions;
  }

  /**
	 * @see org.jbox2d.testbed.framework.TestbedTest#getTestName()
	 */
	@Override
	public String getTestName() {
		return "Character Collision";
	}
	
}