Android Open Source - DropIT My Physics World

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License

The source code is released under:

Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUC...

Java Source Code

package nu.danielsundberg.droid.dropit.physics;
//from  w  w  w.j ava 2s.  co  m
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

import nu.danielsundberg.droid.dropit.DropItEngine;
import nu.danielsundberg.droid.dropit.DropItEngine.PlaceHolderObject;
import nu.danielsundberg.droid.dropit.rendering.object.MyRenderableObject;
import nu.danielsundberg.droid.dropit.rendering.object.TexturedBox;

import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.physics.box2d.Body;
import com.badlogic.gdx.physics.box2d.BodyDef;
import com.badlogic.gdx.physics.box2d.Contact;
import com.badlogic.gdx.physics.box2d.ContactListener;
import com.badlogic.gdx.physics.box2d.FixtureDef;
import com.badlogic.gdx.physics.box2d.PolygonShape;
import com.badlogic.gdx.physics.box2d.World;

public class MyPhysicsWorld implements ContactListener {
  public float timestep = 1/30f;
  public int velocityIterations = 10;
  public int positionIterations = 10;
  public World world;
  private boolean pause = false;
  
  protected List<MyRenderableObject> myObjects = new CopyOnWriteArrayList<MyRenderableObject>();

  private DropItEngine engine;
  
  
  public void setParent(DropItEngine parent) {
    this.engine = parent;
  }

  public void create() {
    Vector2 gravity = new Vector2((float) 0.0, (float) -9.82);
    world = new World(gravity, pause);
    world.setContactListener(this);
        initBounds();
  }

  private void initBounds() {
    initBottom();
    initTop();
    initLeft();
    initRight();
  }

  private void initBottom() {
    PolygonShape shapeDef = new PolygonShape();
    shapeDef.setAsBox((float) 150.0f, (float) 1f);
        
        FixtureDef fixture = new FixtureDef();
        fixture.shape = shapeDef;
        fixture.density = 1f;
        fixture.friction = 0.3f;
        fixture.restitution = 0f;
         
        BodyDef bodyDef = new BodyDef();  
        bodyDef.position.set(new Vector2((float) 0.0, (float) -80.0));
        bodyDef.allowSleep = true;
        
        Body body = world.createBody(bodyDef);
        body.createFixture(fixture);
        body.setType(BodyDef.BodyType.StaticBody);

        body.setActive(true);
  }
  
  private void initTop() {
    PolygonShape shapeDef = new PolygonShape();
    shapeDef.setAsBox((float) 150.0f, (float) 1f);
        
        FixtureDef fixture = new FixtureDef();
        fixture.shape = shapeDef;
        fixture.density = 1f;
        fixture.friction = 0.3f;
        fixture.restitution = 0f;
         
        BodyDef bodyDef = new BodyDef();  
        bodyDef.position.set(new Vector2((float) 0.0, (float) 170.0));
        bodyDef.allowSleep = true;
        
        Body body = world.createBody(bodyDef);
        body.createFixture(fixture);
        body.setType(BodyDef.BodyType.StaticBody);
        body.setActive(true);    
  }
  
  private void initLeft() {
    PolygonShape shapeDef = new PolygonShape();
    shapeDef.setAsBox((float) 1.0f, (float) 200f);
        
        FixtureDef fixture = new FixtureDef();
        fixture.shape = shapeDef;
        fixture.density = 1f;
        fixture.friction = 0.3f;
        fixture.restitution = 0f;
         
        BodyDef bodyDef = new BodyDef();  
        bodyDef.position.set(new Vector2((float) -1.0, (float) 0.0));
        bodyDef.allowSleep = true;
        
        Body body = world.createBody(bodyDef);
        body.createFixture(fixture);
        body.setType(BodyDef.BodyType.StaticBody);

        body.setActive(true);
  }
  
  private void initRight() {
    PolygonShape shapeDef = new PolygonShape();
    shapeDef.setAsBox((float) 1.0f, (float) 200f);
        
        FixtureDef fixture = new FixtureDef();
        fixture.shape = shapeDef;
        fixture.density = 1f;
        fixture.friction = 0.3f;
        fixture.restitution = 0f;
         
        BodyDef bodyDef = new BodyDef();  
        bodyDef.position.set(new Vector2((float) 150.0, (float) 0.0));
        bodyDef.allowSleep = true;
        
        Body body = world.createBody(bodyDef);
        body.createFixture(fixture);
        body.setType(BodyDef.BodyType.StaticBody);

        body.setActive(true);
  }

  public synchronized void addObject(MyRenderableObject object) {
    myObjects.add(object);  
  }
  public synchronized void removeObject(MyRenderableObject object) {
    myObjects.remove(object);
  }

  public void update() {
    for(PlaceHolderObject tmp : engine.toBeAdded){
      
      PolygonShape lineShapeDef = new PolygonShape();
      lineShapeDef.setAsBox(3f, 3f, new Vector2(0f, 0f), 0f);
        
        FixtureDef fixture = new FixtureDef();
        fixture.shape = lineShapeDef;
        fixture.density = 1f;
        fixture.friction = 0.3f;
        fixture.restitution = 0f;
        
      BodyDef newline = new BodyDef();   
      newline.position.set(new Vector2(tmp.sx, tmp.sy));      
        
      
      newline.allowSleep = true;
        
        Body newBody = world.createBody(newline);
        newBody.setType(BodyDef.BodyType.DynamicBody);
        newBody.createFixture(fixture);
        newBody.setActive(true);
        
        MyRenderableObject box = new TexturedBox(tmp.sx, tmp.sy, newline.angle, tmp.texture, tmp.u1, tmp.v1, tmp.u2, tmp.v2);
        
        engine.actors.add(new MyPhysicsActor(box, newBody));
        addObject(box);
        engine.toBeAdded.remove(tmp);
    }
    
    world.step(timestep, velocityIterations, positionIterations);    
  }

  public void pause(boolean b) {
    this.pause = b;
  }

  @Override
  public void beginContact(Contact c) {
    float max = c.getFixtureA().getBody().getLinearVelocity().len()+c.getFixtureB().getBody().getLinearVelocity().len();
    float result = c.getFixtureA().getBody().getLinearVelocity().add(c.getFixtureB().getBody().getLinearVelocity()).len();
    float impact = (max/result)-1;
    if(Math.random()>=Math.random()){
      engine.bounce.play(impact);
    } else if(Math.random()>=Math.random()) {
      engine.bounce2.play(impact);
    } else {
      engine.bounce3.play(impact);
    }
  }

  @Override
  public void endContact(Contact arg0) {}

  public void updateGravity(float f, float g) {
    world.setGravity(new Vector2(f,g));
  }    

}

Java Source Code List

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