com.badlogic.gdx.physics.box2d.PolygonShape Java Examples

/**
 * Creates a wall by constructing a rectangle whose corners are (xmin,ymin) and (xmax,ymax),
 * and rotating the box counterclockwise through the given angle, with specified restitution.
 */
public static Body createWall(World world, float xmin, float ymin, float xmax, float ymax,
        float angle, float restitution) {
    float cx = (xmin + xmax) / 2;
    float cy = (ymin + ymax) / 2;
    float hx = Math.abs((xmax - xmin) / 2);
    float hy = Math.abs((ymax - ymin) / 2);
    PolygonShape wallshape = new PolygonShape();
    // Don't set the angle here; instead call setTransform on the body below. This allows future
    // calls to setTransform to adjust the rotation as expected.
    wallshape.setAsBox(hx, hy, new Vector2(0f, 0f), 0f);

    FixtureDef fdef = new FixtureDef();
    fdef.shape = wallshape;
    fdef.density = 1.0f;
    if (restitution>0) fdef.restitution = restitution;

    BodyDef bd = new BodyDef();
    bd.position.set(cx, cy);
    Body wall = world.createBody(bd);
    wall.createFixture(fdef);
    wall.setType(BodyDef.BodyType.StaticBody);
    wall.setTransform(cx, cy, angle);
    return wall;
}
 

private void createRandomWalls (int n) {
	PolygonShape groundPoly = new PolygonShape();

	BodyDef groundBodyDef = new BodyDef();
	groundBodyDef.type = BodyType.StaticBody;

	FixtureDef fixtureDef = new FixtureDef();
	fixtureDef.shape = groundPoly;
	fixtureDef.filter.groupIndex = 0;

	walls = new Body[n];
	walls_hw = new int[n];
	walls_hh = new int[n];
	for (int i = 0; i < n; i++) {
		groundBodyDef.position.set(MathUtils.random(50, (int)container.stageWidth - 50),
			MathUtils.random(50, (int)container.stageHeight - 50));
		walls[i] = world.createBody(groundBodyDef);
		walls_hw[i] = (int)MathUtils.randomTriangular(20, 150);
		walls_hh[i] = (int)MathUtils.randomTriangular(30, 80);
		groundPoly.setAsBox(walls_hw[i], walls_hh[i]);
		walls[i].createFixture(fixtureDef);

	}
	groundPoly.dispose();
}
 

private void createRandomWalls (int n) {
	PolygonShape groundPoly = new PolygonShape();

	BodyDef groundBodyDef = new BodyDef();
	groundBodyDef.type = BodyType.StaticBody;

	FixtureDef fixtureDef = new FixtureDef();
	fixtureDef.shape = groundPoly;
	fixtureDef.filter.groupIndex = 0;

	walls = new Body[n];
	walls_hw = new int[n];
	walls_hh = new int[n];
	for (int i = 0; i < n; i++) {
		groundBodyDef.position.set(Box2dSteeringTest.pixelsToMeters(MathUtils.random(50, (int)container.stageWidth - 50)),
			Box2dSteeringTest.pixelsToMeters(MathUtils.random(50, (int)container.stageHeight - 50)));
		walls[i] = world.createBody(groundBodyDef);
		walls_hw[i] = (int)MathUtils.randomTriangular(20, 150);
		walls_hh[i] = (int)MathUtils.randomTriangular(30, 80);
		groundPoly.setAsBox(Box2dSteeringTest.pixelsToMeters(walls_hw[i]), Box2dSteeringTest.pixelsToMeters(walls_hh[i]));
		walls[i].createFixture(fixtureDef);

	}
	groundPoly.dispose();
}
 

public static Body createEnemy(World world) {
    EnemyType enemyType = RandomUtils.getRandomEnemyType();
    BodyDef bodyDef = new BodyDef();
    bodyDef.type = BodyDef.BodyType.KinematicBody;
    bodyDef.position.set(new Vector2(enemyType.getX(), enemyType.getY()));
    PolygonShape shape = new PolygonShape();
    shape.setAsBox(enemyType.getWidth() / 2, enemyType.getHeight() / 2);
    Body body = world.createBody(bodyDef);
    body.createFixture(shape, enemyType.getDensity());
    body.resetMassData();
    EnemyUserData userData = new EnemyUserData(enemyType.getWidth(), enemyType.getHeight(),
            enemyType.getAnimationAssetId());
    body.setUserData(userData);
    shape.dispose();
    return body;
}
 

public void createIndestructible(float x, float y, TextureAtlas tileTextureAtlas) {
    BodyDef bodyDef = new BodyDef();
    bodyDef.type = BodyDef.BodyType.StaticBody;
    bodyDef.position.set(x, y);

    Body body = b2dWorld.createBody(bodyDef);
    PolygonShape polygonShape = new PolygonShape();
    polygonShape.setAsBox(0.5f, 0.5f);
    FixtureDef fixtureDef = new FixtureDef();
    fixtureDef.shape = polygonShape;
    fixtureDef.filter.categoryBits = GameManager.INDESTRUCTIIBLE_BIT;
    fixtureDef.filter.maskBits = GameManager.PLAYER_BIT | GameManager.ENEMY_BIT | GameManager.BOMB_BIT;
    body.createFixture(fixtureDef);

    polygonShape.dispose();

    Renderer renderer = new Renderer(new TextureRegion(tileTextureAtlas.findRegion("indestructible"), 0, 0, 16, 16), 16 / GameManager.PPM, 16 / GameManager.PPM);
    renderer.setOrigin(16 / GameManager.PPM / 2, 16 / GameManager.PPM / 2);

    new EntityBuilder(world)
            .with(
                    new Transform(x, y, 1f, 1f, 0),
                    renderer
            )
            .build();
}
 

public RenderOfPolyFixture(Fixture fixture, VertexBufferObjectManager pVBO) {
	super(fixture);

	PolygonShape fixtureShape = (PolygonShape) fixture.getShape();
	int vSize = fixtureShape.getVertexCount();
	float[] xPoints = new float[vSize];
	float[] yPoints = new float[vSize];

	Vector2 vertex = Vector2Pool.obtain();
	for (int i = 0; i < fixtureShape.getVertexCount(); i++) {
		fixtureShape.getVertex(i, vertex);
		xPoints[i] = vertex.x * PhysicsConnector.PIXEL_TO_METER_RATIO_DEFAULT;
		yPoints[i] = vertex.y * PhysicsConnector.PIXEL_TO_METER_RATIO_DEFAULT;
	}
	Vector2Pool.recycle(vertex);

	mEntity = new PolyLine(0, 0, xPoints, yPoints, pVBO);
}
 

/** Polygon Shape **/
public Piece (BodyType type, boolean flag, Vector2... pos) {
	this.shape = new PolygonShape();
	((PolygonShape)this.shape).set(pos);
	this.pos = new Vector2();
	this.type = type;
}
 

/** Box Shape */
public Piece (float halfWidth, float halfHeight, float angle, BodyType type) {
	this.shape = new PolygonShape();
	((PolygonShape)this.shape).setAsBox(halfWidth, halfHeight, ZERO_VEC, 0);
	this.pos = new Vector2();
	this.type = type;
	this.angle = (float)Math.toRadians(angle);
}
 

public static Body createGround(World world) {
    BodyDef bodyDef = new BodyDef();
    bodyDef.position.set(new Vector2(Constants.GROUND_X, Constants.GROUND_Y));
    Body body = world.createBody(bodyDef);
    PolygonShape shape = new PolygonShape();
    shape.setAsBox(Constants.GROUND_WIDTH / 2, Constants.GROUND_HEIGHT / 2);
    body.createFixture(shape, Constants.GROUND_DENSITY);
    body.setUserData(new GroundUserData(Constants.GROUND_WIDTH, Constants.GROUND_HEIGHT));
    shape.dispose();
    return body;
}
 

public static Body createRunner(World world) {
    BodyDef bodyDef = new BodyDef();
    bodyDef.type = BodyDef.BodyType.DynamicBody;
    bodyDef.position.set(new Vector2(Constants.RUNNER_X, Constants.RUNNER_Y));
    PolygonShape shape = new PolygonShape();
    shape.setAsBox(Constants.RUNNER_WIDTH / 2, Constants.RUNNER_HEIGHT / 2);
    Body body = world.createBody(bodyDef);
    body.setGravityScale(Constants.RUNNER_GRAVITY_SCALE);
    body.createFixture(shape, Constants.RUNNER_DENSITY);
    body.resetMassData();
    body.setUserData(new RunnerUserData(Constants.RUNNER_WIDTH, Constants.RUNNER_HEIGHT));
    shape.dispose();
    return body;
}
 

private List<Vector2> getFixtureVertices(Fixture fixture) {
	PolygonShape polygon = (PolygonShape) fixture.getShape();
	int verticesCount = polygon.getVertexCount();

	List<Vector2> vertices = new ArrayList<Vector2>(verticesCount);
	for (int i = 0; i < verticesCount; i++) {
		Vector2 vertex = new Vector2();
		polygon.getVertex(i, vertex);
		vertices.add(new Vector2(fixture.getBody().getWorldPoint(vertex)));
	}

	return vertices;
}
 

/**
 * @param pPhysicsWorld
 * @param pEntity
 * @param pTriangleVertices are to be defined relative to the center of the pEntity and have the {@link PhysicsConstants#PIXEL_TO_METER_RATIO_DEFAULT} applied.
 * 					The vertices will be triangulated and for each triangle a {@link Fixture} will be created.
 * @param pBodyType
 * @param pFixtureDef
 * @return
 */
public static Body createTrianglulatedBody(final PhysicsWorld pPhysicsWorld, final IEntity pEntity, final List<Vector2> pTriangleVertices, final BodyType pBodyType, final FixtureDef pFixtureDef, final float pPixelToMeterRatio) {
	final Vector2[] TMP_TRIANGLE = new Vector2[3];

	final BodyDef boxBodyDef = new BodyDef();
	boxBodyDef.type = pBodyType;

	final float[] sceneCenterCoordinates = pEntity.getSceneCenterCoordinates();
	boxBodyDef.position.x = sceneCenterCoordinates[Constants.VERTEX_INDEX_X] / pPixelToMeterRatio;
	boxBodyDef.position.y = sceneCenterCoordinates[Constants.VERTEX_INDEX_Y] / pPixelToMeterRatio;

	final Body boxBody = pPhysicsWorld.createBody(boxBodyDef);

	final int vertexCount = pTriangleVertices.size();
	for (int i = 0; i < vertexCount; /* */) {
		final PolygonShape boxPoly = new PolygonShape();

		TMP_TRIANGLE[2] = pTriangleVertices.get(i++);
		TMP_TRIANGLE[1] = pTriangleVertices.get(i++);
		TMP_TRIANGLE[0] = pTriangleVertices.get(i++);

		boxPoly.set(TMP_TRIANGLE);
		pFixtureDef.shape = boxPoly;

		boxBody.createFixture(pFixtureDef);

		boxPoly.dispose();
	}

	return boxBody;
}
 

public void addBody(Fixture fixture) {
	try {
		PolygonShape polygon = (PolygonShape) fixture.getShape();
		if (polygon.getVertexCount() > 2) {
			fixtures.add(fixture);
		}
	} catch (ClassCastException e) {
		Gdx.app.debug("BuoyancyController",
				"Fixture shape is not an instance of PolygonShape.");
	}
}
 

public static Shape createTriangleShape(float halfWidth, float halfHeight) {
	PolygonShape triangleShape = new PolygonShape();
	triangleShape
			.set(new Vector2[] { new Vector2(-halfWidth, -halfHeight),
					new Vector2(0, halfHeight),
					new Vector2(halfWidth, -halfHeight) });

	return triangleShape;
}
 

public static Shape createBoxShape(float halfWidth, float halfHeight, Vector2 center, float angle) {
	PolygonShape boxShape = new PolygonShape();
	boxShape.setAsBox(halfWidth, halfHeight, center, angle);
	
	return boxShape;
}
 

/** Creates a wall by constructing a rectangle whose corners are (xmin,ymin) and (xmax,ymax), and rotating the box
 * counterclockwise through the given angle, with specified restitution. */
public static Body createWall (World world, float xmin, float ymin, float xmax, float ymax, float angle, float restitution) {
	float cx = (xmin + xmax) / 2;
	float cy = (ymin + ymax) / 2;
	float hx = (xmax - xmin) / 2;
	float hy = (ymax - ymin) / 2;
	if (hx < 0) {
		hx = -hx;
	}

	if (hy < 0) {
		hy = -hy;
	}

	PolygonShape wallshape = new PolygonShape();
	wallshape.setAsBox(hx, hy, new Vector2(0f, 0f), angle);

	FixtureDef fdef = new FixtureDef();
	fdef.shape = wallshape;
	fdef.density = 1.0f;
	fdef.friction = 0.02f;

	fdef.filter.groupIndex = CollisionFilters.GroupTrackWalls;
	fdef.filter.categoryBits = CollisionFilters.CategoryTrackWalls;
	fdef.filter.maskBits = CollisionFilters.MaskWalls;

	if (Config.Debug.TraverseWalls) {
		fdef.filter.groupIndex = CollisionFilters.GroupNoCollisions;
	}

	if (restitution > 0) {
		fdef.restitution = restitution;
	}

	BodyDef bd = new BodyDef();
	bd.position.set(cx, cy);
	Body wall = world.createBody(bd);
	wall.createFixture(fdef);
	wall.setType(BodyDef.BodyType.StaticBody);
	return wall;
}
 

public static Body createBoxBody(final PhysicsWorld pPhysicsWorld, final float pCenterX, final float pCenterY, final float pWidth, final float pHeight, final float pRotation, final BodyType pBodyType, final FixtureDef pFixtureDef, final float pPixelToMeterRatio) {
	final BodyDef boxBodyDef = new BodyDef();
	boxBodyDef.type = pBodyType;

	boxBodyDef.position.x = pCenterX / pPixelToMeterRatio;
	boxBodyDef.position.y = pCenterY / pPixelToMeterRatio;

	final Body boxBody = pPhysicsWorld.createBody(boxBodyDef);

	final PolygonShape boxPoly = new PolygonShape();

	final float halfWidth = pWidth * 0.5f / pPixelToMeterRatio;
	final float halfHeight = pHeight * 0.5f / pPixelToMeterRatio;

	boxPoly.setAsBox(halfWidth, halfHeight);
	pFixtureDef.shape = boxPoly;

	boxBody.createFixture(pFixtureDef);

	boxPoly.dispose();

	boxBody.setTransform(boxBody.getWorldCenter(), MathUtils.degToRad(pRotation));

	return boxBody;
}
 

public static Shape createPolygonShape(Vector2[] vertices) {
	PolygonShape polygonShape = new PolygonShape();
	polygonShape.set(vertices);

	return polygonShape;
}
 

public static Body createLineBody(final PhysicsWorld pPhysicsWorld, final float pX1, final float pY1, final float pX2, final float pY2, final FixtureDef pFixtureDef, final float pPixelToMeterRatio) {
	final BodyDef lineBodyDef = new BodyDef();
	lineBodyDef.type = BodyType.StaticBody;

	final Body boxBody = pPhysicsWorld.createBody(lineBodyDef);

	final PolygonShape linePoly = new PolygonShape();

	linePoly.setAsEdge(new Vector2(pX1 / pPixelToMeterRatio, pY1 / pPixelToMeterRatio), new Vector2(pX2 / pPixelToMeterRatio, pY2 / pPixelToMeterRatio));
	pFixtureDef.shape = linePoly;

	boxBody.createFixture(pFixtureDef);

	linePoly.dispose();

	return boxBody;
}
 

public void createPortal() {
    float x = GameManager.getInstance().getPortalPosition().x;
    float y = GameManager.getInstance().getPortalPosition().y;

    BodyDef bodyDef = new BodyDef();
    bodyDef.type = BodyDef.BodyType.KinematicBody;
    bodyDef.position.set(x + 0.5f, y + 0.5f);

    Body body = b2dWorld.createBody(bodyDef);

    PolygonShape polygonShape = new PolygonShape();
    polygonShape.setAsBox(0.2f, 0.2f);
    FixtureDef fixtureDef = new FixtureDef();
    fixtureDef.shape = polygonShape;
    fixtureDef.filter.categoryBits = GameManager.PORTAL_BIT;
    fixtureDef.filter.maskBits = GameManager.PLAYER_BIT;
    fixtureDef.isSensor = true;
    body.createFixture(fixtureDef);

    polygonShape.dispose();

    TextureRegion textureRegion = assetManager.get("img/actors.pack", TextureAtlas.class).findRegion("Items");
    Array<TextureRegion> keyFrames = new Array<>();
    for (int i = 6; i < 8; i++) {
        keyFrames.add(new TextureRegion(textureRegion, i * 16, 0, 16, 16));
    }
    Animation anim = new Animation(0.2f, keyFrames, Animation.PlayMode.LOOP);

    HashMap<String, Animation> anims = new HashMap<>();
    anims.put("normal", anim);

    Transform transform = new Transform(body.getPosition().x, body.getPosition().y, 1, 1, 0);
    transform.z = 99; // make portal drawn below player
    Renderer renderer = new Renderer(textureRegion, 16 / GameManager.PPM, 16 / GameManager.PPM);
    renderer.setOrigin(16 / GameManager.PPM / 2, 16 / GameManager.PPM / 2);

    Entity e = new EntityBuilder(world)
            .with(
                    transform,
                    new State("normal"),
                    new Anim(anims),
                    renderer
            )
            .build();

    body.setUserData(e);
}
 

public void createPowerUp(float x, float y) {
    BodyDef bodyDef = new BodyDef();
    bodyDef.type = BodyDef.BodyType.DynamicBody;
    bodyDef.position.set(MathUtils.floor(x) + 0.5f, MathUtils.floor(y) + 0.5f);

    Body body = b2dWorld.createBody(bodyDef);

    PolygonShape polygonShape = new PolygonShape();
    polygonShape.setAsBox(0.4f, 0.4f);
    FixtureDef fixtureDef = new FixtureDef();
    fixtureDef.shape = polygonShape;
    fixtureDef.filter.categoryBits = GameManager.POWERUP_BIT;
    fixtureDef.filter.maskBits = GameManager.PLAYER_BIT;
    fixtureDef.isSensor = true;
    body.createFixture(fixtureDef);

    PowerUp powerUp = new PowerUp();
    int i;
    switch (powerUp.type) {
        case ONE_UP:
            i = 5;
            break;
        case REMOTE:
            i = 4;
            break;
        case KICK:
            i = 3;
            break;
        case SPEED:
            i = 2;
            break;
        case POWER:
            i = 1;
            break;
        case AMMO:
        default:
            i = 0;
            break;

    }

    TextureAtlas textureAtlas = assetManager.get("img/actors.pack", TextureAtlas.class);
    Renderer renderer = new Renderer(new TextureRegion(textureAtlas.findRegion("Items"), i * 16, 0, 16, 16), 16 / GameManager.PPM, 16 / GameManager.PPM);
    renderer.setOrigin(16 / GameManager.PPM / 2, 16 / GameManager.PPM / 2);

    Entity e = new EntityBuilder(world)
            .with(
                    powerUp,
                    new RigidBody(body),
                    new Transform(body.getPosition().x, body.getPosition().y, 1, 1, 0),
                    new State("normal"),
                    renderer
            )
            .build();

    body.setUserData(e);
    polygonShape.dispose();
}
 

/**
 * @param pPhysicsWorld
 * @param pEntity
 * @param pVertices are to be defined relative to the center of the pEntity.
 * @param pBodyType
 * @param pFixtureDef
 * @return
 */
public static Body createPolygonBody(final PhysicsWorld pPhysicsWorld, final IEntity pEntity, final Vector2[] pVertices, final BodyType pBodyType, final FixtureDef pFixtureDef, final float pPixelToMeterRatio) {
	final BodyDef boxBodyDef = new BodyDef();
	boxBodyDef.type = pBodyType;

	final float[] sceneCenterCoordinates = pEntity.getSceneCenterCoordinates();
	boxBodyDef.position.x = sceneCenterCoordinates[Constants.VERTEX_INDEX_X] / pPixelToMeterRatio;
	boxBodyDef.position.y = sceneCenterCoordinates[Constants.VERTEX_INDEX_Y] / pPixelToMeterRatio;

	final Body boxBody = pPhysicsWorld.createBody(boxBodyDef);

	final PolygonShape boxPoly = new PolygonShape();

	boxPoly.set(pVertices);
	pFixtureDef.shape = boxPoly;

	boxBody.createFixture(pFixtureDef);

	boxPoly.dispose();

	return boxBody;
}
 

public void createWall(float x, float y, float mapWidth, float mapHeight, TextureAtlas tileTextureAtlas) {
    BodyDef bodyDef = new BodyDef();
    bodyDef.type = BodyDef.BodyType.StaticBody;
    bodyDef.position.set(x, y);

    Body body = b2dWorld.createBody(bodyDef);
    PolygonShape polygonShape = new PolygonShape();
    polygonShape.setAsBox(0.5f, 0.5f);
    FixtureDef fixtureDef = new FixtureDef();
    fixtureDef.shape = polygonShape;
    fixtureDef.filter.categoryBits = GameManager.INDESTRUCTIIBLE_BIT;
    fixtureDef.filter.maskBits = GameManager.PLAYER_BIT | GameManager.ENEMY_BIT | GameManager.BOMB_BIT;
    body.createFixture(fixtureDef);

    polygonShape.dispose();

    Renderer renderer;

    if (x < 1.0f) {
        if (y < 1.0f) {
            renderer = new Renderer(new TextureRegion(tileTextureAtlas.findRegion("wall"), 0, 16 * 2, 16, 16), 16 / GameManager.PPM, 16 / GameManager.PPM);
        } else if (y > mapHeight - 1) {
            renderer = new Renderer(new TextureRegion(tileTextureAtlas.findRegion("wall"), 0, 16 * 0, 16, 16), 16 / GameManager.PPM, 16 / GameManager.PPM);

        } else {
            renderer = new Renderer(new TextureRegion(tileTextureAtlas.findRegion("wall"), 0, 16 * 1, 16, 16), 16 / GameManager.PPM, 16 / GameManager.PPM);

        }
    } else if (x > mapWidth - 1) {
        if (y < 1.0f) {
            renderer = new Renderer(new TextureRegion(tileTextureAtlas.findRegion("wall"), 16 * 2, 16 * 2, 16, 16), 16 / GameManager.PPM, 16 / GameManager.PPM);

        } else if (y > mapHeight - 1) {
            renderer = new Renderer(new TextureRegion(tileTextureAtlas.findRegion("wall"), 16 * 2, 16 * 0, 16, 16), 16 / GameManager.PPM, 16 / GameManager.PPM);

        } else {
            renderer = new Renderer(new TextureRegion(tileTextureAtlas.findRegion("wall"), 16 * 2, 16 * 1, 16, 16), 16 / GameManager.PPM, 16 / GameManager.PPM);

        }
    } else if (y < 1.0f) {
        renderer = new Renderer(new TextureRegion(tileTextureAtlas.findRegion("wall"), 16 * 1, 16 * 2, 16, 16), 16 / GameManager.PPM, 16 / GameManager.PPM);

    } else if (y > mapHeight - 1) {
        renderer = new Renderer(new TextureRegion(tileTextureAtlas.findRegion("wall"), 16 * 1, 16 * 0, 16, 16), 16 / GameManager.PPM, 16 / GameManager.PPM);

    } else {
        renderer = new Renderer(new TextureRegion(tileTextureAtlas.findRegion("wall"), 0, 0, 16, 16), 16 / GameManager.PPM, 16 / GameManager.PPM);
    }

    renderer.setOrigin(16 / GameManager.PPM / 2, 16 / GameManager.PPM / 2);
    new EntityBuilder(world)
            .with(
                    new Transform(x, y, 1f, 1f, 0),
                    renderer
            )
            .build();
}