@Override
public void create() {
float w = Gdx.graphics.getWidth();
float h = Gdx.graphics.getHeight();
Gdx.input.setInputProcessor(this);
mB2Controllers = new Array<B2Controller>();
mCamPos = new Vector3();
mCurrentPos = new Vector3();
camera = new OrthographicCamera(100, 100 * h / w);
camera.position.set(50, 50, 0);
camera.zoom = 1.8f;
camera.update();
loader = new RubeSceneLoader();
scene = loader.loadScene(Gdx.files.internal("data/palmcontrollers.json"));
debugRender = new Box2DDebugRenderer();
batch = new SpriteBatch();
polygonBatch = new PolygonSpriteBatch();
textureMap = new HashMap<String, Texture>();
textureRegionMap = new HashMap<Texture, TextureRegion>();
createSpatialsFromRubeImages(scene);
createPolySpatialsFromRubeFixtures(scene);
mWorld = scene.getWorld();
// configure simulation settings
mVelocityIter = scene.velocityIterations;
mPositionIter = scene.positionIterations;
if (scene.stepsPerSecond != 0) {
mSecondsPerStep = 1f / scene.stepsPerSecond;
}
mWorld.setContactListener(this);
//
// example of custom property handling
//
Array<Body> bodies = scene.getBodies();
if ((bodies != null) && (bodies.size > 0)) {
for (int i = 0; i < bodies.size; i++) {
Body body = bodies.get(i);
String gameInfo = (String) scene.getCustom(body, "GameInfo", null);
if (gameInfo != null) {
System.out.println("GameInfo custom property: " + gameInfo);
}
}
}
// Instantiate any controllers that are in the scene
Array<Fixture> fixtures = scene.getFixtures();
if ((fixtures != null) && (fixtures.size > 0)) {
for (int i = 0; i < fixtures.size; i++) {
Fixture fixture = fixtures.get(i);
int controllerType = (Integer) scene.getCustom(fixture, "ControllerType", 0);
switch (controllerType) {
case B2Controller.BUOYANCY_CONTROLLER:
// only allow polygon buoyancy controllers for now..
if (fixture.getShape().getType() == Shape.Type.Polygon) {
float bodyHeight = fixture.getBody().getPosition().y;
// B2BuoyancyController b2c = new B2BuoyancyController();
// need to calculate the fluid surface height for the buoyancy controller
PolygonShape shape = (PolygonShape) fixture.getShape();
shape.getVertex(0, mTmp);
float maxHeight =
mTmp.y + bodyHeight; // initialize the height, transforming to 'world'
// coordinates
// find the maxHeight
for (int j = 1; j < shape.getVertexCount(); j++) {
shape.getVertex(j, mTmp);
maxHeight =
Math.max(maxHeight, mTmp.y + bodyHeight); // transform to world coordinates
}
B2BuoyancyController b2c =
new B2BuoyancyController(
B2BuoyancyController.DEFAULT_SURFACE_NORMAL, // assume up
(Vector2)
scene.getCustom(
fixture,
"ControllerVelocity",
B2BuoyancyController.DEFAULT_FLUID_VELOCITY),
mWorld.getGravity(),
maxHeight,
fixture.getDensity(),
(Float)
scene.getCustom(
fixture, "LinearDrag", B2BuoyancyController.DEFAULT_LINEAR_DRAG),
(Float)
scene.getCustom(
fixture, "AngularDrag", B2BuoyancyController.DEFAULT_ANGULAR_DRAG));
fixture.setUserData(b2c); // reference back to the controller from the fixture (see
// beginContact/endContact)
mB2Controllers.add(b2c); // add it to the list so it can be stepped later
}
break;
case B2Controller.GRAVITY_CONTROLLER:
{
B2GravityController b2c = new B2GravityController();
b2c =
new B2GravityController(
(Vector2)
scene.getCustom(
fixture, "ControllerVelocity", B2GravityController.DEFAULT_GRAVITY));
fixture.setUserData(b2c);
mB2Controllers.add(b2c);
}
break;
}
}
}
scene.printStats();
scene.clear(); // no longer need any scene references
}
/**
* adjust the density so that the mass has the given value
*
* @param mass
*/
public void changeMass(float mass) {
fixture.setDensity(mass / body.getMass() * fixture.getDensity());
body.resetMassData();
}
/**
* @param f - fixture that is affected
* @return true if force was applied, false otherwise.
*/
private boolean ApplyToFixture(Fixture f) {
float shapeDensity = mUseDensity ? f.getDensity() : mFluidDensity;
// don't bother with buoyancy on sensors or fixtures with no density
if (f.isSensor() || (shapeDensity == 0)) {
return false;
}
Body body = f.getBody();
mAreac.set(Vector2.Zero);
mMassc.set(Vector2.Zero);
float area = 0;
// Get shape for displacement area calculations
Shape shape = f.getShape();
mSC.set(Vector2.Zero);
float sarea;
switch (shape.getType()) {
case Circle:
sarea =
B2ShapeExtensions.ComputeSubmergedArea(
(CircleShape) shape, mSurfaceNormal, mSurfaceHeight, body.getTransform(), mSC);
break;
case Chain:
sarea =
B2ShapeExtensions.ComputeSubmergedArea(
(ChainShape) shape, mSurfaceNormal, mSurfaceHeight, body.getTransform(), mSC);
break;
case Edge:
sarea =
B2ShapeExtensions.ComputeSubmergedArea(
(EdgeShape) shape, mSurfaceNormal, mSurfaceHeight, body.getTransform(), mSC);
break;
case Polygon:
sarea =
B2ShapeExtensions.ComputeSubmergedArea(
(PolygonShape) shape, mSurfaceNormal, mSurfaceHeight, body.getTransform(), mSC);
break;
default:
sarea = 0;
break;
}
area += sarea;
mAreac.x += sarea * mSC.x;
mAreac.y += sarea * mSC.y;
float mass = sarea * shapeDensity;
mMassc.x += sarea * mSC.x * shapeDensity;
mMassc.y += sarea * mSC.y * shapeDensity;
mAreac.x /= area;
mAreac.y /= area;
mMassc.x /= mass;
mMassc.y /= mass;
if (area < Float.MIN_VALUE) {
return false;
}
if (DEBUG_BUOYANCY) {
// Run debug w/HCR to see the effects of different fluid densities / linear drag
mFluidDensity = 2f;
mLinearDrag = 5;
mAngularDrag = 2;
}
// buoyancy force.
mTmp.set(mGravity).scl(-mFluidDensity * area);
body.applyForce(mTmp, mMassc, true); // multiply by -density to invert gravity
// linear drag.
mTmp.set(
body.getLinearVelocityFromWorldPoint(mAreac).sub(mFluidVelocity).mul(-mLinearDrag * area));
body.applyForce(mTmp, mAreac, true);
// angular drag.
float bodyMass = body.getMass();
if (bodyMass < 1) // prevent a huge torque from being generated...
{
bodyMass = 1;
}
float torque = -body.getInertia() / bodyMass * area * body.getAngularVelocity() * mAngularDrag;
body.applyTorque(torque, true);
return true;
}