added canvasItem factory and added parallax

src/GameState/Factories/CanvasNodeFactory.ts

@@ -0,0 +1,19 @@
+import Scene from "../Scene";
+import Viewport from "../../SceneGraph/Viewport";
+import CanvasItem from "../../Nodes/CanvasNode"
+
+export default class CanvasNodeFactory {
+	private scene: Scene;
+	private viewport: Viewport;
+
+	constructor(scene: Scene, viewport: Viewport){
+		this.scene = scene;
+	}
+
+	add<T extends CanvasItem>(constr: new (...a: any) => T, ...args: any): T {
+		let instance = new constr(...args);
+		instance.init(this.scene);
+		this.scene.add(instance);
+		return instance;
+	}
+}

src/GameState/GameState.ts

@@ -1,15 +1,28 @@
 import Stack from "../DataTypes/Stack";
 import Scene from "./Scene";
+import Viewport from "../SceneGraph/Viewport";
+import Vec2 from "../DataTypes/Vec2";
 
 export default class GameState{
-	private sceneStack: Stack<Scene>;
+    private sceneStack: Stack<Scene>;
+    private worldSize: Vec2;
+    private viewport: Viewport;
 
     constructor(){
         this.sceneStack = new Stack(10);
+        this.worldSize = new Vec2(1600, 1000);
+        this.viewport = new Viewport();
+        this.viewport.setSize(800, 500);
+        this.viewport.setBounds(0, 0, 1600, 1000);
     }
 
-    addScene(scene: Scene, pauseScenesBelow: boolean = true): void {
-        this.sceneStack.forEach((scene: Scene) => scene.setPaused(pauseScenesBelow));
+    createScene(): Scene{
+        let scene = new Scene(this.viewport, this);
+        this.addScene(scene);
+        return scene;
+    }
+
+    addScene(scene: Scene): void {
         this.sceneStack.push(scene);
     }
 

src/GameState/Scene.ts

@@ -2,22 +2,31 @@ import Vec2 from "../DataTypes/Vec2";
 import Viewport from "../SceneGraph/Viewport";
 import SceneGraph from "../SceneGraph/SceneGraph";
 import SceneGraphArray from "../SceneGraph/SceneGraphArray";
-import GameNode from "../Nodes/GameNode";
+import CanvasNode from "../Nodes/CanvasNode";
+import CavnasNodeFactory from "./Factories/CanvasNodeFactory";
+import CanvasNodeFactory from "./Factories/CanvasNodeFactory";
+import GameState from "./GameState";
 
-export default class Scene{
-	private viewport: Viewport
-	private worldSize: Vec2;
-	private sceneGraph: SceneGraph;
-	private paused: boolean;
+export default class Scene {
+    private gameState: GameState;
+    private viewport: Viewport
+    private parallax: Vec2;
+	sceneGraph: SceneGraph;
+    private paused: boolean;
+    private hidden: boolean;
+    
+    // Factories
+    public canvas: CavnasNodeFactory;
 
-    constructor(){
-        this.viewport = new Viewport();
-        this.viewport.setSize(800, 500);
-        // TODO: Find a way to make this not a hard-coded value
-        this.worldSize = new Vec2(1600, 1000);
-        this.viewport.setBounds(0, 0, 1600, 1000);
-        this.sceneGraph = new SceneGraphArray(this.viewport);
+    constructor(viewport: Viewport, gameState: GameState){
+        this.gameState = gameState;
+        this.viewport = viewport;
+        this.parallax = new Vec2(1, 1);
+        this.sceneGraph = new SceneGraphArray(this.viewport, this);
         this.paused = false;
+        this.hidden = false;
+
+        this.canvas = new CanvasNodeFactory(this, this.viewport);
     }
 
     setPaused(pauseValue: boolean): void {
@@ -27,19 +36,39 @@ export default class Scene{
     isPaused(): boolean {
         return this.paused;
     }
+
+    setHidden(hiddenValue: boolean): void {
+        this.hidden = hiddenValue;
+    }
+
+    isHidden(): boolean {
+        return this.hidden;
+    }
+
+    disable(): void {
+        this.paused = true;
+        this.hidden = true;
+    }
+
+    enable(): void {
+        this.paused = false;
+        this.hidden = false;
+    }
     
     getViewport(): Viewport {
         return this.viewport;
     }
 
-    add(children: Array<GameNode> | GameNode): void {
-        if(children instanceof Array){
-            for(let child of children){
-                this.sceneGraph.addNode(child);
-            }
-        } else {
-            this.sceneGraph.addNode(children);
-        }
+    setParallax(x: number, y: number): void {
+        this.parallax.set(x, y);
+    }
+
+    getParallax(): Vec2 {
+        return this.parallax;
+    }
+
+    add(children: CanvasNode): void {
+        this.sceneGraph.addNode(children);
     }
 
     update(deltaT: number): void {
@@ -50,7 +79,11 @@ export default class Scene{
     }
 
     render(ctx: CanvasRenderingContext2D): void {
-        let visibleSet = this.sceneGraph.getVisibleSet();
-        visibleSet.forEach(node => node.render(ctx, this.viewport.getPosition(), this.viewport.getSize()));
+        if(!this.hidden){
+            let visibleSet = this.sceneGraph.getVisibleSet();
+            let viewportOrigin = this.viewport.getPosition();
+            let origin = new Vec2(viewportOrigin.x*this.parallax.x, viewportOrigin.y*this.parallax.y);
+            visibleSet.forEach(node => node.render(ctx, origin));
+        }
     }
 }

src/Nodes/CanvasNode.ts

@@ -1,18 +1,33 @@
 import GameNode from "./GameNode";
 import Vec2 from "../DataTypes/Vec2";
+import Viewport from "../SceneGraph/Viewport";
+import Scene from "../GameState/Scene";
 
 export default abstract class CanvasNode extends GameNode{
 	protected size: Vec2;
+	protected scene: Scene;
 
 	constructor(){
 		super();
 		this.size = new Vec2(0, 0);
 	}
 
+	init(scene: Scene){
+		this.scene = scene;
+	}
+
 	getSize(): Vec2 {
 		return this.size;
 	}
 
+	setSize(vecOrX: Vec2 | number, y: number = null): void {
+		if(vecOrX instanceof Vec2){
+			this.size.set(vecOrX.x, vecOrX.y);
+		} else {
+			this.size.set(vecOrX, y);
+		}
+	}
+
 	contains(x: number, y: number): boolean {
 		if(this.position.x < x && this.position.x + this.size.x > x){
 			if(this.position.y < y && this.position.y + this.size.y > y){
@@ -21,4 +36,6 @@ export default abstract class CanvasNode extends GameNode{
 		}
 		return false;
 	}
+
+	abstract render(ctx: CanvasRenderingContext2D, origin: Vec2): void;
 }

src/Nodes/ColoredCircle.ts

@@ -14,12 +14,20 @@ export default class ColoredCircle extends CanvasNode{
         this.size = new Vec2(50, 50);
     }
 
+    setColor(color: Color): void {
+        this.color = color;
+    }
+
+    getColor(): Color {
+        return this.color;
+    }
+
     update(deltaT: number): void {}
 
-    render(ctx: CanvasRenderingContext2D, viewportOrigin: Vec2, viewportSize: Vec2){
-        ctx.fillStyle = this.color.toStringRGB();
+    render(ctx: CanvasRenderingContext2D, origin: Vec2){
+        ctx.fillStyle = this.color.toStringRGBA();
         ctx.beginPath();
-        ctx.arc(this.position.x + this.size.x/2 - viewportOrigin.x, this.position.y + this.size.y/2 - viewportOrigin.y, this.size.x/2, 0, Math.PI*2, false);
+        ctx.arc(this.position.x + this.size.x/2 - origin.x, this.position.y + this.size.y/2 - origin.y, this.size.x/2, 0, Math.PI*2, false);
         ctx.fill();
         ctx.closePath();
     }

src/Nodes/GameNode.ts

@@ -21,6 +21,14 @@ export default abstract class GameNode{
 		return this.position;
 	}
 
+	setPosition(vecOrX: Vec2 | number, y: number = null): void {
+		if(vecOrX instanceof Vec2){
+			this.position.set(vecOrX.x, vecOrX.y);
+		} else {
+			this.position.set(vecOrX, y);
+		}
+	}
+
 	subscribe(eventType: string){
 		this.eventQueue.subscribe(this.receiver, eventType);
 	}
@@ -31,6 +39,4 @@ export default abstract class GameNode{
 	}
 
 	abstract update(deltaT: number): void;
-
-	abstract render(ctx: CanvasRenderingContext2D, viewportOrigin: Vec2, viewportSize: Vec2): void;
 }

src/Nodes/Player.ts

@@ -25,8 +25,8 @@ export default class Player extends CanvasNode{
 		this.position = this.position.add(this.velocity.scale(deltaT));
 	}
 
-	render(ctx: CanvasRenderingContext2D, viewportOrigin: Vec2, viewportSize: Vec2){
+	render(ctx: CanvasRenderingContext2D, origin: Vec2){
 		ctx.fillStyle = "#FF0000";
-		ctx.fillRect(this.position.x - viewportOrigin.x, this.position.y - viewportOrigin.y, this.size.x, this.size.y);
+		ctx.fillRect(this.position.x - origin.x, this.position.y - origin.y, this.size.x, this.size.y);
 	}
 }

src/Nodes/UIElement.ts

@@ -51,22 +51,6 @@ export default class UIElement extends CanvasNode{
 		this.isEntered = false;
 	}
 
-	setPosition(vecOrX: Vec2 | number, y: number = null): void {
-		if(vecOrX instanceof Vec2){
-			this.position.set(vecOrX.x, vecOrX.y);
-		} else {
-			this.position.set(vecOrX, y);
-		}
-	}
-
-	setSize(vecOrX: Vec2 | number, y: number = null): void {
-		if(vecOrX instanceof Vec2){
-			this.size.set(vecOrX.x, vecOrX.y);
-		} else {
-			this.size.set(vecOrX, y);
-		}
-	}
-
 	setText(text: string): void {
 		this.text = text;
 	}
@@ -163,14 +147,14 @@ export default class UIElement extends CanvasNode{
 		return this.textColor.toStringRGBA();
 	}
 
-	render(ctx: CanvasRenderingContext2D, viewportOrigin: Vec2, viewportSize: Vec2): void {
+	render(ctx: CanvasRenderingContext2D, origin: Vec2): void {
 		ctx.font = this.fontSize + "px " + this.font;
 		let offset = this.calculateOffset(ctx);
 
 		ctx.fillStyle = this.calculateBackgroundColor();
-		ctx.fillRect(this.position.x - viewportOrigin.x, this.position.y - viewportOrigin.y, this.size.x, this.size.y);
+		ctx.fillRect(this.position.x - origin.x, this.position.y - origin.y, this.size.x, this.size.y);
 		
 		ctx.fillStyle = this.calculateTextColor();
-		ctx.fillText(this.text, this.position.x + offset.x - viewportOrigin.x, this.position.y + offset.y - viewportOrigin.y);
+		ctx.fillText(this.text, this.position.x + offset.x - origin.x, this.position.y + offset.y - origin.y);
 	}
 }

src/SceneGraph/SceneGraph.ts

@@ -1,29 +1,29 @@
 import Viewport from "./Viewport";
-import GameNode from "../Nodes/GameNode";
+import CanvasNode from "../Nodes/CanvasNode";
 import Map from "../DataTypes/Map";
 import Vec2 from "../DataTypes/Vec2";
 
 export default abstract class SceneGraph{
 	protected viewport: Viewport;
-	protected nodeMap: Map<GameNode>;
+	protected nodeMap: Map<CanvasNode>;
 	protected idCounter: number;
 
     constructor(viewport: Viewport){
 		this.viewport = viewport;
-		this.nodeMap = new Map<GameNode>();
+		this.nodeMap = new Map<CanvasNode>();
 		this.idCounter = 0;
     }
 
-    addNode(node: GameNode): number {
+    addNode(node: CanvasNode): number {
 		this.nodeMap.add(this.idCounter.toString(), node);
 		this.addNodeSpecific(node, this.idCounter.toString());
 		this.idCounter += 1;
 		return this.idCounter - 1;
 	};
 
-	protected abstract addNodeSpecific(node: GameNode, id: string): void;
+	protected abstract addNodeSpecific(node: CanvasNode, id: string): void;
 
-    removeNode(node: GameNode): void {
+    removeNode(node: CanvasNode): void {
 		// Find and remove node in O(n)
 		// TODO: Can this be better?
 		let id = this.nodeMap.keys().filter((key: string) => this.nodeMap.get(key) === node)[0];
@@ -33,13 +33,13 @@ export default abstract class SceneGraph{
 		}
 	};
 
-	protected abstract removeNodeSpecific(node: GameNode, id: string): void;
+	protected abstract removeNodeSpecific(node: CanvasNode, id: string): void;
 
-	getNode(id: string): GameNode{
+	getNode(id: string): CanvasNode{
 		return this.nodeMap.get(id);
 	};
 
-    getNodeAt(vecOrX: Vec2 | number, y: number = null): GameNode{
+    getNodeAt(vecOrX: Vec2 | number, y: number = null): CanvasNode{
 		if(vecOrX instanceof Vec2){
 			return this.getNodeAtCoords(vecOrX.x, vecOrX.y);
 		} else {
@@ -47,9 +47,9 @@ export default abstract class SceneGraph{
 		}
 	}
     
-    protected abstract getNodeAtCoords(x: number, y: number): GameNode;
+    protected abstract getNodeAtCoords(x: number, y: number): CanvasNode;
     
     abstract update(deltaT: number): void;
 
-    abstract getVisibleSet(): Array<GameNode>;
+    abstract getVisibleSet(): Array<CanvasNode>;
 }

src/SceneGraph/SceneGraphArray.ts

@@ -1,13 +1,16 @@
 import SceneGraph from "./SceneGraph";
 import CanvasNode from "../Nodes/CanvasNode";
 import Viewport from "./Viewport";
+import Scene from "../GameState/Scene";
 
 export default class SceneGraphArray extends SceneGraph{
 	private nodeList: Array<CanvasNode>;
-	private turnOffViewportCulling_demoTool: boolean;
+    private turnOffViewportCulling_demoTool: boolean;
+    private scene: Scene;
 
-    constructor(viewport: Viewport){
+    constructor(viewport: Viewport, scene: Scene){
         super(viewport);
+        this.scene = scene;
 
         this.nodeList = new Array<CanvasNode>();
         this.turnOffViewportCulling_demoTool = false;
@@ -57,7 +60,7 @@ export default class SceneGraphArray extends SceneGraph{
         let visibleSet = new Array<CanvasNode>();
 
         for(let node of this.nodeList){
-            if(this.viewport.includes(node)){
+            if(this.viewport.includes(node, this.scene.getParallax())){
                 visibleSet.push(node);
             }
         }

src/SceneGraph/Viewport.ts

@@ -40,11 +40,13 @@ export default class Viewport{
 		}
     }
     
-    includes(node: CanvasNode): boolean {
+    includes(node: CanvasNode, parallax: Vec2): boolean {
         let nodePos = node.getPosition();
         let nodeSize = node.getSize();
-        if(nodePos.x + nodeSize.x > this.position.x && nodePos.x < this.position.x + this.size.x){
-            if(nodePos.y + nodeSize.y > this.position.y && nodePos.y < this.position.y + this.size.y){
+        let originX = this.position.x*parallax.x;
+        let originY = this.position.y*parallax.y;
+        if(nodePos.x + nodeSize.x > originX && nodePos.x < originX + this.size.x){
+            if(nodePos.y + nodeSize.y > originY && nodePos.y < originY + this.size.y){
                 return true;
             }
         }

src/main.ts

@@ -9,32 +9,41 @@ import Button from "./Nodes/UIElements/Button";
 function main(){
     // Create the game object
     let game = new GameLoop();
+    let gameState = game.getGameState();
 
-    let mainScene = new Scene();
-    let pauseMenu = new Scene();
+    let backgroundScene = gameState.createScene();
+    backgroundScene.setParallax(0.5, 0.5);
+    let mainScene = gameState.createScene();
+    let foregroundLayer = gameState.createScene();
+    foregroundLayer.setParallax(1.5, 1.5);
+    let uiLayer = gameState.createScene();
+    uiLayer.setParallax(0, 0);
+    let pauseMenu = gameState.createScene();
+    pauseMenu.setParallax(0, 0);
 
     // Initialize GameObjects
-    let player = new Player();
+    let player = mainScene.canvas.add(Player);
+    mainScene.getViewport().follow(player);
 
-    let recordButton = new Button();
+    let recordButton = uiLayer.canvas.add(Button);
     recordButton.setSize(100, 50);
     recordButton.setText("Record");
     recordButton.setPosition(400, 30);
     recordButton.onClickEventId = "record_button_press";
 
-    let stopButton = new Button();
+    let stopButton = uiLayer.canvas.add(Button);
     stopButton.setSize(100, 50);
     stopButton.setText("Stop");
     stopButton.setPosition(550, 30);
     stopButton.onClickEventId = "stop_button_press";
 
-    let playButton = new Button();
+    let playButton = uiLayer.canvas.add(Button);
     playButton.setSize(100, 50);
     playButton.setText("Play");
     playButton.setPosition(700, 30);
     playButton.onClickEventId = "play_button_press";
 
-    let cycleFramerateButton = new Button();
+    let cycleFramerateButton = uiLayer.canvas.add(Button);
     cycleFramerateButton.setSize(150, 50);
     cycleFramerateButton.setText("Cycle FPS");
     cycleFramerateButton.setPosition(5, 400);
@@ -45,38 +54,48 @@ function main(){
         i = (i + 1) % 3;
     }
 
-    let pauseButton = new Button();
+    let pauseButton = uiLayer.canvas.add(Button);
     pauseButton.setSize(100, 50);
     pauseButton.setText("Pause");
     pauseButton.setPosition(700, 400);
     pauseButton.onClick = () => {
-        game.getGameState().addScene(pauseMenu);
+        mainScene.setPaused(true);
+        pauseMenu.enable();
     }
 
-    let modalBackground = new UIElement();
+    let modalBackground = pauseMenu.canvas.add(UIElement);
     modalBackground.setSize(400, 200);
     modalBackground.setBackgroundColor(new Color(0, 0, 0, 0.4));
     modalBackground.setPosition(200, 100);
 
-    let resumeButton = new Button();
+    let resumeButton = pauseMenu.canvas.add(Button);
     resumeButton.setSize(100, 50);
     resumeButton.setText("Resume");
     resumeButton.setPosition(400, 200);
     resumeButton.onClick = () => {
-        game.getGameState().removeScene();
+        mainScene.setPaused(false);
+        pauseMenu.disable();
     }
 
-    let lotsOfCircs = [];
     for(let i = 0; i < 10; i++){
-        lotsOfCircs.push(new ColoredCircle());
+        mainScene.canvas.add(ColoredCircle);
     }
 
+    for(let i = 0; i < 20; i++){
+        let cc = backgroundScene.canvas.add(ColoredCircle);
+        cc.setSize(30, 30);
+        cc.setColor(cc.getColor().darken().darken())
+        cc.getColor().a = 0.8;
+    }
 
-    mainScene.add([...lotsOfCircs, player, recordButton, stopButton, playButton, cycleFramerateButton, pauseButton]);
-    mainScene.getViewport().follow(player);
-    pauseMenu.add([modalBackground, resumeButton]);
+    for(let i = 0; i < 30; i++){
+        let cc = foregroundLayer.canvas.add(ColoredCircle);
+        cc.setSize(80, 80);
+        cc.setColor(cc.getColor().lighten().lighten())
+        cc.getColor().a = 0.5;
+    }
 
-    game.getGameState().changeScene(mainScene);
+    pauseMenu.disable();
 
     game.start();
 }