@Override
public void initialize() {
super.initialize();
// doStep true = not simulate inactive bodies
world = new World(new Vector2(0.0f, 10.0f), true);
world.setContinuousPhysics(true);
world.setWarmStarting(true);
world.setAutoClearForces(true);
ValueMap valueMap = game.getGameState();
valueMap.setValue((String) null, VAR_PH_WORLD, world);
velocityIterations = 24;
positionIterations = 8;
for (SceneElement e : effect.getElements()) {
createBody(world, e, valueMap);
}
for (SceneElement e : effect.getJoints()) {
createBody(world, e, valueMap);
}
RevoluteJointDef jd = new RevoluteJointDef();
jd.collideConnected = false;
for (int i = 0; i < effect.getJoints().size() - 1; i += 2) {
SceneElement e1 = effect.getJoints().get(i);
SceneElement e2 = effect.getJoints().get(i + 1);
Body b1 = (Body) valueMap.getValue(e1.getId(), VAR_PH_BODY, null);
Body b2 = (Body) valueMap.getValue(e2.getId(), VAR_PH_BODY, null);
jd.initialize(b2, b1, new Vector2(b1.getPosition().x, b1.getPosition().y));
world.createJoint(jd);
}
}
@Override
public void act(float delta) {
super.act(delta);
timeStep = delta / 1000.0f;
world.step(timeStep, velocityIterations, positionIterations);
Scene scene = (Scene) gui.getScene().getElement();
if (scene != null) {
for (SceneElement e : scene.getSceneElements()) {
ValueMap valueMap = game.getGameState();
Body b = (Body) valueMap.getValue(e.getId(), VAR_PH_BODY, null);
if (b != null) {
valueMap.setValue(e, SceneElement.VAR_X, (float) (b.getWorldCenter().x * WORLD_SCALE));
valueMap.setValue(e, SceneElement.VAR_Y, (float) (b.getWorldCenter().y * WORLD_SCALE));
valueMap.setValue(e, SceneElement.VAR_ROTATION, (float) Math.toDegrees(b.getAngle()));
}
}
} else {
stop();
}
}
public static void createBody(World world, SceneElement e, ValueMap valueMap) {
float x = valueMap.getValue(e, SceneElement.VAR_X, 0f) / WORLD_SCALE;
float y = valueMap.getValue(e, SceneElement.VAR_Y, 0f) / WORLD_SCALE;
float width = valueMap.getValue(e, SceneElement.VAR_WIDTH, 1) / WORLD_SCALE;
float height = valueMap.getValue(e, SceneElement.VAR_HEIGHT, 1) / WORLD_SCALE;
// TODO what if corner is not center?
PhType phType = valueMap.getValue(e, PhysicsEf.VAR_PH_TYPE, PhType.DYNAMIC);
PhShape phShape = valueMap.getValue(e, PhysicsEf.VAR_PH_SHAPE, PhShape.RECTANGULAR);
Shape s = null;
switch (phShape) {
case CIRCULAR:
s = new CircleShape();
s.setRadius(width / 2);
break;
default:
s = new PolygonShape();
((PolygonShape) s).setAsBox(width / 2, height / 2);
}
BodyDef bd = new BodyDef();
switch (phType) {
case STATIC:
bd.type = BodyType.StaticBody;
break;
case DYNAMIC:
bd.type = BodyType.DynamicBody;
break;
}
bd.position.set(x, y);
bd.angle = valueMap.getValue(e, SceneElement.VAR_ROTATION, 0);
FixtureDef fixture = new FixtureDef();
fixture.shape = s;
fixture.density = valueMap.getValue(e, PhysicsEf.VAR_PH_DENSITY, 1f);
fixture.friction = valueMap.getValue(e, PhysicsEf.VAR_PH_FRICTION, 1f);
fixture.restitution = valueMap.getValue(e, PhysicsEf.VAR_PH_RESTITUTION, 1f);
Body body = world.createBody(bd);
body.createFixture(fixture);
body.resetMassData();
valueMap.setValue(e.getId(), VAR_PH_BODY, body);
}