dcb0fa4312
Sprite nodes use Point instead of Vector2 Updates sprite test app Refactors accounting for pivot points in sprites Adds abstract NodeWithSize class in Sprites. Refactors SpriteNode to Sprite Refactors TransformNode to Node (may need to find another name as it conflicts with Sky's Node). Sprite system now uses and caches transformation matrices. R=abarth@chromium.org Review URL: https://codereview.chromium.org/1180703002.
192 lines
5.6 KiB
Dart
192 lines
5.6 KiB
Dart
part of game;
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class GameWorld extends Node {
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World world;
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List<Body> bodies = [];
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Body _bodyShip;
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Image _imgBg;
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Image _imgAsteroid;
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Image _imgShip;
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double _steeringInput;
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double _thrustInput;
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double _lastSteeringSpeed = 0.0;
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GameWorld(ImageMap images) {
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this.width = 1024.0;
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this.height = 1024.0;
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// Fetch images
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_imgBg = images["https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/resources-auto/BurnTexture.png"];
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_imgAsteroid = images["https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resources-auto/asteroid_big_002.png"];
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_imgShip = images["https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resources-auto/GG_blueship_Lv3.png"];
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// Create the physics world
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world = new World.withGravity(new Vector2(0.0, 0.0));
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// Add a background
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addBackground();
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// Add some asteroids to the game world
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for (int i = 0; i < 50; i++) {
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addAsteroid(10.0);
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}
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for (int i = 0; i < 50; i++) {
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addAsteroid(20.0);
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}
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// Add ship
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addShip();
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}
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void addBackground() {
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Sprite sprtBg = new Sprite.withImage(_imgBg);
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sprtBg.width = width;
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sprtBg.height = height;
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sprtBg.pivot = new Vector2(0.0, 0.0);
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this.addChild(sprtBg);
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}
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void addAsteroid([double radius=20.0]) {
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// Create shape
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final CircleShape shape = new CircleShape();
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shape.radius = radius;
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// Define fixture (links body and shape)
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final FixtureDef activeFixtureDef = new FixtureDef();
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activeFixtureDef.restitution = 1.0;
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activeFixtureDef.density = 0.05;
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activeFixtureDef.shape = shape;
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// Define body
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final BodyDef bodyDef = new BodyDef();
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bodyDef.type = BodyType.DYNAMIC;
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bodyDef.position = new Vector2(0.0, 30.0);
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bodyDef.linearDamping = 0.0;
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bodyDef.angularDamping = 0.0;
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// Create body and fixture from definitions
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final Body body = world.createBody(bodyDef);
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body.createFixtureFromFixtureDef(activeFixtureDef);
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// Set position of object
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Math.Random rand = new Math.Random();
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body.setTransform(new Vector2(rand.nextDouble() * this.width, rand.nextDouble() * this.height), 0.0);
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body.applyLinearImpulse(new Vector2(rand.nextDouble()*10000.0-5000.0, rand.nextDouble()*10000.0-5000.0), new Vector2(0.0, 0.0), true);
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// Add to list
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bodies.add(body);
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// Create sprite
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Sprite sprt = new Sprite.withImage(_imgAsteroid);
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sprt.width = radius*2;
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sprt.height = radius*2;
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// sprt.colorOverlay = new Color(0x33ff0000);
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// sprt.transferMode = TransferMode.plusMode;
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body.userData = sprt;
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this.addChild(sprt);
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}
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void addShip() {
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double radius = 30.0;
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// Create shape
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final CircleShape shape = new CircleShape();
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shape.radius = radius;
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// Define fixture (links body and shape)
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final FixtureDef activeFixtureDef = new FixtureDef();
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activeFixtureDef.restitution = 1.0;
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activeFixtureDef.density = 0.05;
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activeFixtureDef.shape = shape;
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// Define body
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final BodyDef bodyDef = new BodyDef();
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bodyDef.type = BodyType.DYNAMIC;
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bodyDef.position = new Vector2(0.0, 30.0);
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bodyDef.linearDamping = 0.0;
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bodyDef.angularDamping = 0.95;
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// Create body and fixture from definitions
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final Body body = world.createBody(bodyDef);
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body.createFixtureFromFixtureDef(activeFixtureDef);
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// Center on screen
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body.setTransform(new Vector2(width/2.0, height/2.0), 90.0);
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// Add to list
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bodies.add(body);
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_bodyShip = body;
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// Create sprite
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Sprite sprt = new Sprite.withImage(_imgShip);
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sprt.width = radius*2;
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sprt.height = radius*2;
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sprt.position = new Vector2(width/2.0, height/2.0);
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body.userData = sprt;
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this.addChild(sprt);
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}
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void update(double dt) {
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// Apply thrust
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if (_thrustInput != null) {
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double force = _thrustInput*10000.0;
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double rad = degrees2radians(_bodyShip.getAngle());
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_bodyShip.applyLinearImpulse(new Vector2(Math.cos(rad)*force, Math.sin(rad)*force), new Vector2(0.0, 0.0), true);
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}
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// Simulate world
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world.stepDt(1.0/60.0, 10, 10); // Pass in dt
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// Apply stearing
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if (_steeringInput != null) {
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_lastSteeringSpeed = _steeringInput * 4.0;
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}
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else {
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_lastSteeringSpeed *= 0.75;
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}
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_bodyShip.setTransform(_bodyShip.position, _bodyShip.getAngle() + _lastSteeringSpeed);
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// Update all sprites
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bodies.forEach(updateBody);
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}
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void updateBody(Body body) {
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Sprite sprt = body.userData;
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double rot = 0.0; //body.getRotation();
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// Check bounds and warp objects
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if (body.position[0] < -sprt.width/2) {
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body.setTransform(new Vector2(body.position[0] + this.width + sprt.width, body.position[1]), rot);
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}
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if (body.position[0] > this.width + sprt.width/2) {
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body.setTransform(new Vector2(body.position[0] - (this.width + sprt.width), body.position[1]), rot);
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}
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if (body.position[1] < -sprt.height/2) {
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body.setTransform(new Vector2(body.position[0], body.position[1] + this.height + sprt.height), rot);
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}
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if (body.position[1] > this.height + sprt.height/2) {
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body.setTransform(new Vector2(body.position[0], body.position[1] - (this.height + sprt.height)), rot);
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}
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// Update sprite
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sprt.position = body.position;
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sprt.rotation = body.getAngle();
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}
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void controlSteering(double input) {
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_steeringInput = input;
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}
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void controlThrust(double input) {
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_thrustInput = input;
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}
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void controlFire() {
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}
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}
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