Joints and Motors - Box2D for Flash Games - page 116

4. Test the movie, move the siege machine left and right, and fire with the up

arrow key.

This has been a huge achievement. Building a siege machine with Box2D is not easy,
but you managed to do it. It's time to kill some pigs.

Putting it all together
Time to take all of our Box2D knowledge and put it all together, to create the
ultimate mix between Angry Birds and Crush the Castle.

1. First, we modify a little the ground function to let it create the ground in the

same place as we created it during our latest Angry Birds prototype:
private function ground():void {
var bodyDef:b2BodyDef=new b2BodyDef();
bodyDef.position.Set(320/worldScale,465/worldScale);
var polygonShape:b2PolygonShape=new b2PolygonShape();
polygonShape.SetAsBox(320/worldScale,10/worldScale);
var fixtureDef:b2FixtureDef=new b2FixtureDef();
fixtureDef.shape=polygonShape;
var groundBody:b2Body=world.CreateBody(bodyDef);
groundBody.CreateFixture(fixtureDef);
}