| part of game; |
| |
| class GameWorld extends TransformNode { |
| |
| World world; |
| List<Body> bodies = []; |
| Body _bodyShip; |
| |
| Image _imgBg; |
| Image _imgAsteroid; |
| Image _imgShip; |
| |
| double _steeringInput; |
| double _thrustInput; |
| double _lastSteeringSpeed = 0.0; |
| |
| GameWorld(ImageMap images) { |
| this.width = 1024.0; |
| this.height = 1024.0; |
| |
| // Fetch images |
| _imgBg = images["https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/resources-auto/BurnTexture.png"]; |
| _imgAsteroid = images["https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resources-auto/asteroid_big_002.png"]; |
| _imgShip = images["https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resources-auto/GG_blueship_Lv3.png"]; |
| |
| // Create the physics world |
| world = new World.withGravity(new Vector2(0.0, 0.0)); |
| |
| // Add a background |
| addBackground(); |
| |
| // Add some asteroids to the game world |
| for (int i = 0; i < 5; i++) { |
| addAsteroid(10.0); |
| } |
| for (int i = 0; i < 5; i++) { |
| addAsteroid(20.0); |
| } |
| |
| // Add ship |
| addShip(); |
| } |
| |
| void addBackground() { |
| SpriteNode sprtBg = new SpriteNode.withImage(_imgBg); |
| sprtBg.width = width; |
| sprtBg.height = height; |
| sprtBg.pivot = new Vector2(0.0, 0.0); |
| this.children.add(sprtBg); |
| } |
| |
| void addAsteroid([double radius=20.0]) { |
| |
| // Create shape |
| final CircleShape shape = new CircleShape(); |
| shape.radius = radius; |
| |
| // Define fixture (links body and shape) |
| final FixtureDef activeFixtureDef = new FixtureDef(); |
| activeFixtureDef.restitution = 1.0; |
| activeFixtureDef.density = 0.05; |
| activeFixtureDef.shape = shape; |
| |
| // Define body |
| final BodyDef bodyDef = new BodyDef(); |
| bodyDef.type = BodyType.DYNAMIC; |
| bodyDef.position = new Vector2(0.0, 30.0); |
| bodyDef.linearDamping = 0.0; |
| bodyDef.angularDamping = 0.0; |
| |
| // Create body and fixture from definitions |
| final Body body = world.createBody(bodyDef); |
| body.createFixtureFromFixtureDef(activeFixtureDef); |
| |
| // Set position of object |
| Math.Random rand = new Math.Random(); |
| body.setTransform(new Vector2(rand.nextDouble() * this.width, rand.nextDouble() * this.height), 0.0); |
| body.applyLinearImpulse(new Vector2(rand.nextDouble()*10000.0-5000.0, rand.nextDouble()*10000.0-5000.0), new Vector2(0.0, 0.0), true); |
| |
| // Add to list |
| bodies.add(body); |
| |
| // Create sprite |
| SpriteNode sprt = new SpriteNode.withImage(_imgAsteroid); |
| sprt.width = radius*2; |
| sprt.height = radius*2; |
| // sprt.colorOverlay = new Color(0x33ff0000); |
| // sprt.transferMode = TransferMode.plusMode; |
| body.userData = sprt; |
| this.children.add(sprt); |
| } |
| |
| void addShip() { |
| double radius = 30.0; |
| |
| // Create shape |
| final CircleShape shape = new CircleShape(); |
| shape.radius = radius; |
| |
| // Define fixture (links body and shape) |
| final FixtureDef activeFixtureDef = new FixtureDef(); |
| activeFixtureDef.restitution = 1.0; |
| activeFixtureDef.density = 0.05; |
| activeFixtureDef.shape = shape; |
| |
| // Define body |
| final BodyDef bodyDef = new BodyDef(); |
| bodyDef.type = BodyType.DYNAMIC; |
| bodyDef.position = new Vector2(0.0, 30.0); |
| bodyDef.linearDamping = 0.0; |
| bodyDef.angularDamping = 0.95; |
| |
| // Create body and fixture from definitions |
| final Body body = world.createBody(bodyDef); |
| body.createFixtureFromFixtureDef(activeFixtureDef); |
| |
| // Center on screen |
| body.setTransform(new Vector2(width/2.0, height/2.0), 90.0); |
| |
| // Add to list |
| bodies.add(body); |
| _bodyShip = body; |
| |
| // Create sprite |
| SpriteNode sprt = new SpriteNode.withImage(_imgShip); |
| sprt.width = radius*2; |
| sprt.height = radius*2; |
| sprt.position = new Vector2(width/2.0, height/2.0); |
| body.userData = sprt; |
| this.children.add(sprt); |
| } |
| |
| void update(double dt) { |
| // Apply thrust |
| if (_thrustInput != null) { |
| double force = _thrustInput*10000.0; |
| double rad = degrees2radians(_bodyShip.getAngle()); |
| _bodyShip.applyLinearImpulse(new Vector2(Math.cos(rad)*force, Math.sin(rad)*force), new Vector2(0.0, 0.0), true); |
| } |
| |
| // Simulate world |
| world.stepDt(1.0/60.0, 10, 10); // Pass in dt |
| |
| // Apply stearing |
| if (_steeringInput != null) { |
| _lastSteeringSpeed = _steeringInput * 4.0; |
| } |
| else { |
| _lastSteeringSpeed *= 0.75; |
| } |
| _bodyShip.setTransform(_bodyShip.position, _bodyShip.getAngle() + _lastSteeringSpeed); |
| |
| // Update all sprites |
| bodies.forEach(updateBody); |
| } |
| |
| void updateBody(Body body) { |
| SpriteNode sprt = body.userData; |
| double rot = 0.0; //body.getRotation(); |
| |
| // Check bounds and warp objects |
| if (body.position[0] < -sprt.width/2) { |
| body.setTransform(new Vector2(body.position[0] + this.width + sprt.width, body.position[1]), rot); |
| } |
| if (body.position[0] > this.width + sprt.width/2) { |
| body.setTransform(new Vector2(body.position[0] - (this.width + sprt.width), body.position[1]), rot); |
| } |
| if (body.position[1] < -sprt.height/2) { |
| body.setTransform(new Vector2(body.position[0], body.position[1] + this.height + sprt.height), rot); |
| } |
| if (body.position[1] > this.height + sprt.height/2) { |
| body.setTransform(new Vector2(body.position[0], body.position[1] - (this.height + sprt.height)), rot); |
| } |
| |
| // Update sprite |
| sprt.position = body.position; |
| sprt.rotation = body.getAngle(); |
| } |
| |
| void controlSteering(double input) { |
| _steeringInput = input; |
| } |
| |
| void controlThrust(double input) { |
| _thrustInput = input; |
| } |
| |
| void controlFire() { |
| |
| } |
| } |
