sky/examples/game/lib/game_world.dart - Issue 1161023006: Adds basic support for images in game example

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Issue 1161023006: Adds basic support for images in game example (Closed) Base URL: https://github.com/domokit/mojo.git@master

Patch Set: Created 5 years, 6 months ago

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(Empty)
	1 part of game;

	2

	3 class GameWorld extends TransformNode {

	4

	5 World world;

	6 List<Body> bodies = [];

	7 Image _image;

	8

	9 GameWorld(double width, double height) {

	10 this.width = width;

	11 this.height = height;

	12

	13 world = new World.withGravity(new Vector2(0.0, 0.0));

	14

	15 // Load and add background

	16 Image imgBg = new Image()..src="https://raw.githubusercontent.com/slembcke/G alacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/reso urces-auto/BurnTexture.png";

	17 SpriteNode sprtBg = new SpriteNode.withImage(imgBg);

	18 sprtBg.width = width;

	19 sprtBg.height = height;

	20 sprtBg.pivot = new Vector2(0.0, 0.0);

	21 this.children.add(sprtBg);

	22

	23 // Load asteroid image

	24 _image = new Image()..src="https://raw.githubusercontent.com/slembcke/Galact icGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/r esources-auto/asteroid_big_002.png";

	25 }

	26

	27 void addAsteroid([double radius=20.0]) {

	28

	29 // Create shape

	30 final CircleShape shape = new CircleShape();

	31 shape.radius = radius;

	32

	33 // Define fixture (links body and shape)

	34 final FixtureDef activeFixtureDef = new FixtureDef();

	35 activeFixtureDef.restitution = 1.0;

	36 activeFixtureDef.density = 0.05;

	37 activeFixtureDef.shape = shape;

	38

	39 // Define body

	40 final BodyDef bodyDef = new BodyDef();

	41 bodyDef.type = BodyType.DYNAMIC;

	42 bodyDef.position = new Vector2(0.0, 30.0);

	43 bodyDef.linearDamping = 0.0;

	44 bodyDef.angularDamping = 0.0;

	45

	46 // Create body and fixture from definitions

	47 final Body body = world.createBody(bodyDef);

	48 body.createFixtureFromFixtureDef(activeFixtureDef);

	49

	50 // Set position of object

	51 Math.Random rand = new Math.Random();

	52 body.setTransform(new Vector2(rand.nextDouble() * this.width, rand.nextDoubl e() * this.height), 0.0);

	53 body.applyLinearImpulse(new Vector2(rand.nextDouble()10000.0-5000.0, rand.n extDouble()10000.0-5000.0), new Vector2(0.0, 0.0), true);

	54

	55 // Add to list

	56 bodies.add(body);

	57

	58 SpriteNode sprt = new SpriteNode.withImage(_image);

	59 sprt.width = radius*2;

	60 sprt.height = radius*2;

	61 body.userData = sprt;

	62 this.children.add(sprt);

	63 }

	64

	65 void update(double dt) {

	66 world.stepDt(1.0/60.0, 10, 10); // Pass in dt

	67

	68 bodies.forEach(updateBody);

	69 }

	70

	71 void updateBody(Body body) {

	72 SpriteNode sprt = body.userData;

	73 double rot = 0.0; //body.getRotation();

	74

	75 // Check bounds and warp objects

	76 if (body.position[0] < -sprt.width/2) {

	77 body.setTransform(new Vector2(body.position[0] + this.width + sprt.width, body.position[1]), rot);

	78 }

	79 if (body.position[0] > this.width + sprt.width/2) {

	80 body.setTransform(new Vector2(body.position[0] - (this.width + sprt.width) , body.position[1]), rot);

	81 }

	82 if (body.position[1] < -sprt.height/2) {

	83 body.setTransform(new Vector2(body.position[0], body.position[1] + this.he ight + sprt.height), rot);

	84 }

	85 if (body.position[1] > this.height + sprt.height/2) {

	86 body.setTransform(new Vector2(body.position[0], body.position[1] - (this.h eight + sprt.height)), rot);

	87 }

	88

	89 // Update sprite

	90 sprt.position = body.position;

	91 sprt.rotation = body.getAngle();

	92 }

	93 }

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