Initial version of working game with Box2D, images, nodes and sprites.

R=abarth@chromium.org Review URL: https://codereview.chromium.org/1161023006

Initial version of working game with Box2D, images, nodes and sprites.
R=abarth@chromium.org Review URL: https://codereview.chromium.org/1161023006
3118a6fb · Viktor Lidholt · 81cc63ed · 3118a6fb · 3118a6fb · 3118a6fb
Commit 3118a6fb authored Jun 02, 2015 by Viktor Lidholt
8 changed files
--- a/examples/game/lib/game.dart
+++ b/examples/game/lib/game.dart
+library game;
+
+import 'dart:sky';
+import 'dart:math' as Math;
+import 'package:vector_math/vector_math_64.dart';
+import 'sprites.dart';
+import 'package:box2d/box2d.dart';
+
+part 'game_world.dart';
\ No newline at end of file
--- a/examples/game/lib/game_world.dart
+++ b/examples/game/lib/game_world.dart
+part of game;
+
+class GameWorld extends TransformNode {
+  
+  World world;
+  List<Body> bodies = [];
+  Image _image;
+  
+  GameWorld(double width, double height) {
+    this.width = width;
+    this.height = height;
+    
+    world = new World.withGravity(new Vector2(0.0, 0.0));
+    
+    // Load and add background
+    Image imgBg = new Image()..src="https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/resources-auto/BurnTexture.png";
+    SpriteNode sprtBg = new SpriteNode.withImage(imgBg);
+    sprtBg.width = width;
+    sprtBg.height = height;
+    sprtBg.pivot = new Vector2(0.0, 0.0);
+    this.children.add(sprtBg);
+
+    SpriteNode sprtCenter = new SpriteNode.withImage(imgBg);
+    sprtCenter.width = 32.0;
+    sprtCenter.height = 32.0;
+    sprtCenter.position = new Vector2(512.0, 512.0);
+    this.children.add(sprtCenter);
+
+    // Load asteroid image
+    _image = new Image()..src="https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resources-auto/asteroid_big_002.png";
+
+    // Add some asteroids to the game world
+    for (int i = 0; i < 50; i++) {
+      addAsteroid(10.0);
+    }
+    for (int i = 0; i < 50; i++) {
+      addAsteroid(20.0);
+    }
+  }
+  
+  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);
+    
+    SpriteNode sprt = new SpriteNode.withImage(_image);
+    sprt.width = radius*2;
+    sprt.height = radius*2;
+    body.userData = sprt;
+    this.children.add(sprt);
+  }
+  
+  void update(double dt) {
+    world.stepDt(1.0/60.0, 10, 10);  // Pass in dt
+    
+    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();
+  }
+}
\ No newline at end of file
--- a/examples/game/lib/sprite_box.dart
+++ b/examples/game/lib/sprite_box.dart
+part of sprites;
+
+enum SpriteBoxTransformMode {
+  nativePoints,
+  letterbox,
+  stretch,
+  scaleToFit,
+  fixedWidth,
+  fixedHeight,
+}
+
+class SpriteBox extends RenderBox {
+
+  // Root node for drawing
+  TransformNode _rootNode;
+
+  // Tracking of frame rate and updates
+  double _lastTimeStamp;
+  int _numFrames = 0;
+
+  SpriteBoxTransformMode transformMode;
+  double systemWidth;
+  double systemHeight;
+
+  SpriteBox(TransformNode rootNode, [SpriteBoxTransformMode mode = SpriteBoxTransformMode.nativePoints, double width=1024.0, double height=1024.0]) {
+    // Setup root node
+    _rootNode = rootNode;
+
+    // Setup transform mode
+    transformMode = mode;
+    systemWidth = width;
+    systemHeight = height;
+
+    _scheduleTick();
+  }
+
+  void performLayout() {
+    size = constraints.constrain(new Size.infinite());
+  }
+
+  void handlePointer(PointerEvent event) {
+    switch (event.type) {
+      case 'pointerdown':
+        print("pointerdown");
+        break;
+    }
+  }
+
+  void paint(RenderNodeDisplayList canvas) {
+    // Move to correct coordinate space before drawing
+    double scaleX = 1.0;
+    double scaleY = 1.0;
+    double offsetX = 0.0;
+    double offsetY = 0.0;
+
+    switch(transformMode) {
+      case SpriteBoxTransformMode.stretch:
+        scaleX = size.width/systemWidth;
+        scaleY = size.height/systemHeight;
+        break;
+      case SpriteBoxTransformMode.letterbox:
+        scaleX = size.width/systemWidth;
+        scaleY = size.height/systemHeight;
+        if (scaleX > scaleY) {
+          scaleY = scaleX;
+          offsetY = (size.height - scaleY * systemHeight)/2.0;
+        }
+        else {
+          scaleX = scaleY;
+          offsetX = (size.width - scaleX * systemWidth)/2.0;
+        }
+        break;
+      case SpriteBoxTransformMode.nativePoints:
+        break;
+      default:
+        assert(false);
+        break;
+    }
+
+    canvas.save();
+
+    canvas.translate(offsetX, offsetY);
+    canvas.scale(scaleX, scaleY);
+
+    // Draw the sprite tree
+    _rootNode.visit(canvas);
+
+    canvas.restore();
+  }
+
+  int _animationId = 0;
+
+  void _scheduleTick() {
+    _animationId = scheduler.requestAnimationFrame(_tick);
+  }
+
+  void _tick(double timeStamp) {
+
+      // Calculate the time between frames in seconds
+    if (_lastTimeStamp == null) _lastTimeStamp = timeStamp;
+    double delta = (timeStamp - _lastTimeStamp) / 1000;
+    _lastTimeStamp = timeStamp;
+
+    // Count the number of frames we've been running
+    _numFrames += 1;
+
+    // Print frame rate
+    if (_numFrames % 60 == 0) print("delta: ${delta} fps: ${1.0/delta}");
+
+    _rootNode.update(delta);
+    _scheduleTick();
+  }
+}
\ No newline at end of file
--- a/examples/game/lib/sprite_node.dart
+++ b/examples/game/lib/sprite_node.dart
+part of sprites;
+
+// TODO: Actually draw images
+
+class SpriteNode extends TransformNode {
+  
+  Image _image;
+  bool constrainProportions = false;
+  
+  SpriteNode() {
+    this.pivot = new Vector2(0.5, 0.5);
+  }
+  
+  SpriteNode.withImage(Image image) : super() {
+    this.pivot = new Vector2(0.5, 0.5);
+    _image = image;
+  }
+  
+  void paint(PictureRecorder canvas) {
+
+    if (_image != null && _image.width > 0 && _image.height > 0) {
+      canvas.save();
+      
+      double scaleX = _width/_image.width;
+      double scaleY = _height/_image.height;
+      
+      if (constrainProportions) {
+        // Constrain proportions, using the smallest scale and by centering the image
+        if (scaleX < scaleY) {
+          canvas.translate(0.0, (_height - scaleX * _image.height)/2.0);
+          scaleY = scaleX;
+        }
+        else {
+          canvas.translate((_width - scaleY * _image.width)/2.0, 0.0);
+          scaleX = scaleY;
+        }
+      }
+      
+      canvas.scale(scaleX, scaleY);
+      canvas.drawImage(_image, 0.0, 0.0, new Paint()..setARGB(255, 255, 255, 255));
+      canvas.restore();
+    }
+    else {
+      // Paint a red square for missing texture
+      canvas.drawRect(new Rect.fromLTRB(0.0, 0.0, this.width, this.height),
+          new Paint()..setARGB(255, 255, 0, 0));
+    }
+  }
+  
+}
\ No newline at end of file
--- a/examples/game/lib/sprites.dart
+++ b/examples/game/lib/sprites.dart
+library sprites;
+
+import 'dart:sky';
+import 'dart:math' as Math;
+import 'package:vector_math/vector_math_64.dart';
+import 'package:sky/framework/app.dart';
+import 'package:sky/framework/rendering/render_box.dart';
+import 'package:sky/framework/rendering/render_node.dart';
+import 'package:sky/framework/scheduler.dart' as scheduler;
+
+part 'sprite_box.dart';
+part 'transform_node.dart';
+part 'sprite_node.dart';
\ No newline at end of file
--- a/examples/game/lib/transform_node.dart
+++ b/examples/game/lib/transform_node.dart
+part of sprites;
+
+double degrees2radians(double degrees) => degrees * Math.PI/180.8;
+
+double radians2degrees(double radians) => radians * 180.0/Math.PI;
+
+class TransformNode {
+  Vector2 _position;
+  double _rotation;
+  
+  bool _isMatrixDirty;
+  Matrix3 _transform;
+  Matrix3 _pivotTransform;
+  
+  double _width;
+  double _height;
+  
+  Vector2 _pivot;
+  
+  List<TransformNode>children;
+  
+  
+  TransformNode() {
+    _width = 0.0;
+    _height = 0.0;
+    _rotation = 0.0;
+    _pivot = new Vector2(0.0, 0.0);
+    _position = new Vector2(0.0, 0.0);
+    _isMatrixDirty = false;
+    _transform = new Matrix3.identity();
+    _pivotTransform = new Matrix3.identity();
+    children = [];
+  }
+  
+  double get rotation => _rotation;
+  
+  void set rotation(double rotation) {
+    _rotation = rotation;
+    _isMatrixDirty = true;
+  }
+  
+  
+  Vector2 get position => _position;
+  
+  void set position(Vector2 position) {
+    _position = position;
+    _isMatrixDirty = true;
+  }
+  
+  double get width => _width;
+  
+  void set width(double width) {
+    _width = width;
+    _isMatrixDirty = true;
+  }
+  
+  
+  double get height => _height;
+    
+  void set height(double height) {
+    _height = height;
+    _isMatrixDirty = true;
+  }
+  
+  Vector2 get pivot => _pivot;
+  
+  void set pivot(Vector2 pivot) {
+    _pivot = pivot;
+    _isMatrixDirty = true;
+  }
+  
+  
+  Matrix3 get transformMatrix {
+    if (!_isMatrixDirty) {
+      return _transform;
+    }
+   
+    Vector2 pivotInPoints = new Vector2(_width * _pivot[0], _height * _pivot[1]);
+    
+    double cx, sx, cy, sy;
+    
+    if (_rotation == 0) {
+      cx = 1.0;
+      sx = 0.0;
+      cy = 1.0;
+      sy = 0.0;
+    }
+    else {
+      double radiansX = degrees2radians(_rotation);
+      double radiansY = degrees2radians(_rotation);
+      
+      cx = Math.cos(radiansX);
+      sx = Math.sin(radiansX);
+      cy = Math.cos(radiansY);
+      sy = Math.sin(radiansY);
+    }
+    
+    // TODO: Add support for scale
+    double scaleX = 1.0;
+    double scaleY = 1.0;
+    
+    // Create transformation matrix for scale, position and rotation
+    _transform.setValues(cy * scaleX, sy * scaleX, 0.0,
+               -sx * scaleY, cx * scaleY, 0.0,
+               _position[0], _position[1], 1.0);
+    
+    if (_pivot.x != 0 || _pivot.y != 0) {
+      _pivotTransform.setValues(1.0, 0.0, 0.0, 0.0, 1.0, 0.0, pivotInPoints[0], pivotInPoints[1], 1.0);
+      _transform.multiply(_pivotTransform);
+    }
+    
+    return _transform;
+  }
+  
+  void visit(PictureRecorder canvas) {
+    prePaint(canvas);
+    paint(canvas);
+    visitChildren(canvas);
+    postPaint(canvas);
+  }
+  
+  void prePaint(PictureRecorder canvas) {
+    canvas.save();
+    
+    canvas.translate(_position[0], _position[1]);
+    canvas.rotateDegrees(_rotation);
+    canvas.translate(-_width*_pivot[0], -_height*_pivot[1]);
+    
+    // TODO: Use transformation matrix instead of individual calls
+//    List<double> matrix = [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0];
+//    this.transformMatrix.copyIntoArray(matrix);
+//    canvas.concat(matrix);
+  }
+  
+  void paint(PictureRecorder canvas) {
+    
+  }
+ 
+  void visitChildren(PictureRecorder canvas) {
+    children.forEach((child) => child.visit(canvas));
+  }
+  
+  void postPaint(PictureRecorder canvas) {
+    canvas.restore();
+  }
+
+  void update(double dt) {
+
+  }
+}
\ No newline at end of file
--- a/examples/game/main.dart
+++ b/examples/game/main.dart
+import 'dart:sky';
+import 'lib/game.dart';
+import 'lib/sprites.dart';
+import 'package:sky/framework/app.dart';
+
+AppView app;
+
+void main() {
+  // Create a new app with the sprite box that contains our game world
+  app = new AppView(new SpriteBox(new GameWorld(1024.0, 1024.0),SpriteBoxTransformMode.letterbox));
+}
--- a/examples/game/pubspec.yaml
+++ b/examples/game/pubspec.yaml
+name: game
+dependencies:
+  box2d: any