fixed tilemap physics

src/DataTypes/Tilesets/Tileset.ts

@@ -65,7 +65,7 @@ export default class Tileset {
         return tileIndex >= this.startIndex && tileIndex <= this.endIndex;
     }
 
-    renderTile(ctx: CanvasRenderingContext2D, tileIndex: number, dataIndex: number, worldSize: Vec2, origin: Vec2): void {
+    renderTile(ctx: CanvasRenderingContext2D, tileIndex: number, dataIndex: number, worldSize: Vec2, origin: Vec2, scale: Vec2): void {
         let index = tileIndex - this.startIndex;
         let row = Math.floor(index / this.numCols);
         let col = index % this.numCols;
@@ -73,8 +73,8 @@ export default class Tileset {
         let height = this.tileSize.y;
         let left = col * width;
         let top = row * height;
-        let x = (dataIndex % worldSize.x) * width * 4;
+        let x = (dataIndex % worldSize.x) * width * scale.x;
-        let y = Math.floor(dataIndex / worldSize.x) * height * 4;
+        let y = Math.floor(dataIndex / worldSize.x) * height * scale.y;
-        ctx.drawImage(this.image, left, top, width, height, x - origin.x, y - origin.y, width * 4, height * 4);
+        ctx.drawImage(this.image, left, top, width, height, x - origin.x, y - origin.y, width * scale.x, height * scale.y);
     }
 }

src/DataTypes/Vec2.ts

@@ -80,4 +80,8 @@ export default class Vec2 {
 	toFixed(): string {
 		return "(" + this.x.toFixed(1) + ", " + this.y.toFixed(1) + ")";
 	}
+
+	clone(): Vec2 {
+		return new Vec2(this.x, this.y);
+	}
 }

src/GameState/Factories/PhysicsNodeFactory.ts

@@ -2,6 +2,7 @@ import Scene from "../Scene";
 import Viewport from "../../SceneGraph/Viewport";
 import PhysicsNode from "../../Physics/PhysicsNode";
 import PhysicsManager from "../../Physics/PhysicsManager";
+import Tilemap from "../../Nodes/Tilemap";
 
 export default class PhysicsNodeFactory {
 	private scene: Scene;
@@ -20,4 +21,8 @@ export default class PhysicsNodeFactory {
 		this.physicsManager.add(instance);
 		return instance;
 	}
+
+	addTilemap(tilemap: Tilemap): void {
+		this.physicsManager.addTilemap(tilemap);
+	}
 }

src/GameState/Factories/TilemapFactory.ts

@@ -28,17 +28,20 @@ export default class TilemapFactory {
                 this.scene.addTilemap(tilemap);
 
                 if(tilemap.isCollidable()){
-                    // Create colliders
+                    // Register in physics as a tilemap
-                    let worldSize = tilemap.getWorldSize();
+                    this.scene.physics.addTilemap(tilemap);
-                    let tileSize = tilemap.getTileSize();
 
-                    tilemap.forEachTile((tileIndex: number, i: number) => {
+                    // Create colliders
-                        if(tileIndex !== 0){
+                    // let worldSize = tilemap.getWorldSize();
-                            let x = (i % worldSize.x) * tileSize.x * 4;
+                    // let tileSize = tilemap.getTileSize();
-                            let y = Math.floor(i / worldSize.x) * tileSize.y * 4;
+
-                            this.scene.physics.add(StaticBody, new Vec2(x, y), new Vec2(tileSize.x * 4, tileSize.y * 4));
+                    // tilemap.forEachTile((tileIndex: number, i: number) => {
-                        }
+                    //     if(tileIndex !== 0){
-                    });
+                    //         let x = (i % worldSize.x) * tileSize.x * 4;
+                    //         let y = Math.floor(i / worldSize.x) * tileSize.y * 4;
+                    //         this.scene.physics.add(StaticBody, new Vec2(x, y), new Vec2(tileSize.x * 4, tileSize.y * 4));
+                    //     }
+                    // });
                 }
 
                 // Load images for the tilesets

src/GameState/GameState.ts

@@ -8,11 +8,10 @@ export default class GameState{
     private worldSize: Vec2;
     private viewport: Viewport;
 
-    constructor(){
+    constructor(viewport: Viewport){
         this.sceneStack = new Stack(10);
         this.worldSize = new Vec2(1600, 1000);
-        this.viewport = new Viewport();
+        this.viewport = viewport;
-        this.viewport.setSize(800, 500);
         this.viewport.setBounds(0, 0, 2560, 1280);
     }
 

src/GameState/Scene.ts

@@ -98,6 +98,7 @@ export default class Scene {
             this.viewport.update(deltaT);
             this.physicsManager.update(deltaT);
             this.sceneGraph.update(deltaT);
+            this.tilemaps.forEach((tilemap: Tilemap) => tilemap.update(deltaT));
         }
     }
 

src/Input/InputReceiver.ts

@@ -2,6 +2,7 @@ import Receiver from "../Events/Receiver";
 import Map from "../DataTypes/Map";
 import Vec2 from "../DataTypes/Vec2";
 import EventQueue from "../Events/EventQueue";
+import Viewport from "../SceneGraph/Viewport";
 
 export default class InputReceiver{
 	private static instance: InputReceiver = null;
@@ -14,6 +15,7 @@ export default class InputReceiver{
 	private mousePressPosition: Vec2;
 	private eventQueue: EventQueue;
 	private receiver: Receiver;
+	private viewport: Viewport;
 
 	private constructor(){
 		this.mousePressed = false;
@@ -108,7 +110,19 @@ export default class InputReceiver{
 		return this.mousePosition;
 	}
 
+	getGlobalMousePosition(): Vec2 {
+		return this.mousePosition.clone().add(this.viewport.getPosition());
+	}
+
 	getMousePressPosition(): Vec2 {
 		return this.mousePressPosition;
 	}
+
+	getGlobalMousePressPosition(): Vec2 {
+		return this.mousePressPosition.clone().add(this.viewport.getPosition());
+	}
+
+	setViewport(viewport: Viewport): void {
+		this.viewport = viewport;
+	}
 }

src/Loop/GameLoop.ts

@@ -5,6 +5,7 @@ import Recorder from "../Playback/Recorder";
 import GameState from "../GameState/GameState";
 import Debug from "../Debug/Debug";
 import ResourceManager from "../ResourceManager/ResourceManager";
+import Viewport from "../SceneGraph/Viewport";
 
 export default class GameLoop{
 	// The amount of time to spend on a physics step
@@ -30,6 +31,7 @@ export default class GameLoop{
 	readonly GAME_CANVAS: HTMLCanvasElement;
 	readonly WIDTH: number;
     readonly HEIGHT: number;
+    private viewport: Viewport;
 	private ctx: CanvasRenderingContext2D;
 	private eventQueue: EventQueue;
 	private inputHandler: InputHandler;
@@ -57,12 +59,15 @@ export default class GameLoop{
         this.WIDTH = 800;
         this.HEIGHT = 500;
         this.ctx = this.initializeCanvas(this.GAME_CANVAS, this.WIDTH, this.HEIGHT);
+        this.viewport = new Viewport();
+        this.viewport.setSize(this.WIDTH, this.HEIGHT);
 
         this.eventQueue = EventQueue.getInstance();
         this.inputHandler = new InputHandler(this.GAME_CANVAS);
         this.inputReceiver = InputReceiver.getInstance();
+        this.inputReceiver.setViewport(this.viewport);
         this.recorder = new Recorder();
-        this.gameState = new GameState();
+        this.gameState = new GameState(this.viewport);
         this.debug = Debug.getInstance();
         this.resourceManager = ResourceManager.getInstance();
     }

src/Nodes/Tilemap.ts

@@ -8,11 +8,13 @@ import { TiledTilemapData, TiledLayerData } from "../DataTypes/Tilesets/TiledDat
  */
 export default abstract class Tilemap extends GameNode {
     protected data: number[];
+    protected collisionData: number [];
     protected tilesets: Tileset[];
     protected worldSize: Vec2;
     protected tileSize: Vec2;
     protected visible: boolean;
     protected collidable: boolean;
+    protected scale: Vec2;
 
     constructor(tilemapData: TiledTilemapData, layerData: TiledLayerData){
         super();
@@ -20,6 +22,7 @@ export default abstract class Tilemap extends GameNode {
         this.worldSize = new Vec2(0, 0);
         this.tileSize = new Vec2(0, 0);
         this.parseTilemapData(tilemapData, layerData);
+        this.scale = new Vec2(4, 4);
     }
 
     isCollidable(): boolean {
@@ -39,9 +42,19 @@ export default abstract class Tilemap extends GameNode {
     }
 
     getTileSize(): Vec2 {
-        return this.tileSize;
+        return this.tileSize.clone().scale(this.scale.x, this.scale.y);
     }
 
+    getScale(): Vec2 {
+        return this.scale;
+    }
+
+    setScale(scale: Vec2): void {
+        this.scale = scale;
+    }
+
+    abstract getTileAt(worldCoords: Vec2): number;
+
     isReady(): boolean {
         if(this.tilesets.length !== 0){
             for(let tileset of this.tilesets){

src/Nodes/Tilemaps/OrthogonalTilemap.ts

@@ -10,6 +10,7 @@ export default class OrthogonalTilemap extends Tilemap {
         this.worldSize.set(tilemapData.width, tilemapData.height);
         this.tileSize.set(tilemapData.tilewidth, tilemapData.tileheight);
         this.data = layer.data;
+        this.collisionData = this.data.map(tile => tile !== 0 ? 1 : 0);
         this.visible = layer.visible;
         this.collidable = false;
         if(layer.properties){
@@ -22,7 +23,40 @@ export default class OrthogonalTilemap extends Tilemap {
         tilemapData.tilesets.forEach(tilesetData => this.tilesets.push(new Tileset(tilesetData)));
     }
 
-    forEachTile(func: Function){
+    getTileAt(worldCoords: Vec2): number {
+        let localCoords = this.getColRowAt(worldCoords);
+        if(localCoords.x < 0 || localCoords.x >= this.worldSize.x || localCoords.y < 0 || localCoords.y >= this.worldSize.y){
+            // There are no tiles in negative positions or out of bounds positions
+            return 0;
+        }
+
+        return this.data[localCoords.y * this.worldSize.x + localCoords.x];
+    }
+
+    isTileCollidable(indexOrCol: number, row?: number): boolean {
+        if(row){
+            if(indexOrCol < 0 || indexOrCol >= this.worldSize.x || row < 0 || row >= this.worldSize.y){
+                // There are no tiles in negative positions or out of bounds positions
+                return false;
+            }
+            return this.collisionData[row * this.worldSize.x + indexOrCol] === 1 && this.collidable;
+        } else {
+            if(indexOrCol < 0 || indexOrCol >= this.collisionData.length){
+                // Tiles that don't exist aren't collidable
+                return false;
+            }
+            return this.collisionData[indexOrCol] === 1 && this.collidable;
+        }
+    }
+
+    // TODO: Should this throw an error if someone tries to access an out of bounds value?
+    getColRowAt(worldCoords: Vec2): Vec2 {
+        let col = Math.floor(worldCoords.x / this.tileSize.x / this.scale.x);
+        let row = Math.floor(worldCoords.y / this.tileSize.y / this.scale.y);
+        return new Vec2(col, row);
+    }
+
+    forEachTile(func: Function): void {
         for(let i = 0; i < this.data.length; i++){
             func(this.data[i], i);
         }
@@ -37,7 +71,7 @@ export default class OrthogonalTilemap extends Tilemap {
 
             for(let tileset of this.tilesets){
                 if(tileset.hasTile(tileIndex)){
-                    tileset.renderTile(ctx, tileIndex, i, this.worldSize, origin);
+                    tileset.renderTile(ctx, tileIndex, i, this.worldSize, origin, this.scale);
                 }
             }
         }

src/Physics/PhysicsManager.ts

@@ -3,14 +3,18 @@ import Vec2 from "../DataTypes/Vec2";
 import StaticBody from "./StaticBody";
 import Debug from "../Debug/Debug";
 import MathUtils from "../Utils/MathUtils";
+import Tilemap from "../Nodes/Tilemap";
+import OrthogonalTilemap from "../Nodes/Tilemaps/OrthogonalTilemap";
 
 export default class PhysicsManager {
 
     physicsNodes: Array<PhysicsNode>;
+    tilemaps: Array<Tilemap>;
     movements: Array<MovementData>;
 
     constructor(){
         this.physicsNodes = new Array();
+        this.tilemaps = new Array();
         this.movements = new Array();
     }
 
@@ -18,6 +22,10 @@ export default class PhysicsManager {
         this.physicsNodes.push(node);
     }
 
+    addTilemap(tilemap: Tilemap): void {
+        this.tilemaps.push(tilemap);
+    }
+
     addMovement(node: PhysicsNode, velocity: Vec2){
         this.movements.push(new MovementData(node, velocity));
     }
@@ -51,8 +59,14 @@ export default class PhysicsManager {
                 }
             }
 
-            for(let staticNode of staticSet){
+            // TODO handle collisions between dynamic nodes
-                this.handleCollision(movingNode, staticNode, velocity, (<StaticBody>staticNode).id);
+            // We probably want to sort them by their left edges
+
+            // TODO: handle collisions between dynamic nodes and static nodes
+
+            // Handle Collisions with the tilemaps
+            for(let tilemap of this.tilemaps){
+                this.collideWithTilemap(movingNode, tilemap, velocity);
             }
 
             movingNode.finishMove(velocity);
@@ -62,102 +76,90 @@ export default class PhysicsManager {
         this.movements = new Array();
     }
 
+    collideWithTilemap(node: PhysicsNode, tilemap: Tilemap, velocity: Vec2){
+        if(tilemap instanceof OrthogonalTilemap){
+            this.collideWithOrthogonalTilemap(node, tilemap, velocity);
+        }
+    }
+
+    collideWithOrthogonalTilemap(node: PhysicsNode, tilemap: OrthogonalTilemap, velocity: Vec2){
+        let startPos = node.getPosition();
+        let endPos = startPos.clone().add(velocity);
+        let size = node.getCollider().getSize();
+        let min = new Vec2(Math.min(startPos.x, endPos.x), Math.min(startPos.y, endPos.y));
+        let max = new Vec2(Math.max(startPos.x + size.x, endPos.x + size.x), Math.max(startPos.y + size.y, endPos.y + size.y));
+
+        let minIndex = tilemap.getColRowAt(min);
+        let maxIndex = tilemap.getColRowAt(max);
+
+        let tilemapCollisions = new Array<TileCollisionData>();
+        let tileSize = tilemap.getTileSize();
+
+        Debug.getInstance().log("tilemapCollision", "");
+        // Loop over all possible tiles
+        for(let col = minIndex.x; col <= maxIndex.x; col++){
+            for(let row = minIndex.y; row <= maxIndex.y; row++){
+                if(tilemap.isTileCollidable(col, row)){
+                    Debug.getInstance().log("tilemapCollision", "Colliding with Tile");
+                
+                    // Tile position
+                    let tilePos = new Vec2(col * tileSize.x, row * tileSize.y);
+
+                    // Calculate collision area
+                    let dx = Math.min(startPos.x, tilePos.x) - Math.max(startPos.x + size.x, tilePos.x + size.x);
+                    let dy = Math.min(startPos.y, tilePos.y) - Math.max(startPos.y + size.y, tilePos.y + size.y);
+
+                    let overlap = 0;
+                    if(dx * dy > 0){
+                        overlap = dx * dy;
+                    }
+
+                    tilemapCollisions.push(new TileCollisionData(tilePos, overlap));
+                }
+            }
+        }
+
+        // Now that we have all collisions, sort by collision area
+        tilemapCollisions = tilemapCollisions.sort((a, b) => a.overlapArea - b.overlapArea);
+
+        // Resolve the collisions
+        tilemapCollisions.forEach(collision => {
+            let [firstContact, _, collidingX, collidingY] = this.getTimeOfCollision(startPos, size, velocity, collision.position, tileSize, new Vec2(0, 0));
+
+            // Handle collision
+            if( (firstContact.x < 1 || collidingX) && (firstContact.y < 1 || collidingY)){
+                if(collidingX && collidingY){
+                    // If we're already intersecting, freak out I guess?
+                } else {
+                    // let contactTime = Math.min(firstContact.x, firstContact.y);
+                    // velocity.scale(contactTime);
+                    let xScale = MathUtils.clamp(firstContact.x, 0, 1);
+                    let yScale = MathUtils.clamp(firstContact.y, 0, 1);
+                    
+                    // Handle special case of stickiness on corner to corner collisions
+                    if(xScale === yScale){
+                        xScale = 1;
+                    }
+
+                    if(yScale !== 1){
+                        node.setIsGrounded(true);
+                    }
+
+                    velocity.scale(xScale, yScale);
+                }
+            }
+        })
+    }
+
     handleCollision(movingNode: PhysicsNode, staticNode: PhysicsNode, velocity: Vec2, id: String){
         let sizeA = movingNode.getCollider().getSize();
-        let A = movingNode.getPosition();
+        let posA = movingNode.getPosition();
         let velA = velocity;
         let sizeB = staticNode.getCollider().getSize();
-        let B = staticNode.getPosition();
+        let posB = staticNode.getPosition();
         let velB = new Vec2(0, 0);
 
-        let firstContact = new Vec2(0, 0);
+        let [firstContact, _, collidingX, collidingY] = this.getTimeOfCollision(posA, sizeA, velA, posB, sizeB, velB);
-        let lastContact = new Vec2(0, 0);
-
-        let collidingX = false;
-        let collidingY = false;
-
-        // Sort by position
-        if(B.x < A.x){
-            // Swap, because B is to the left of A
-            let temp: Vec2;
-            temp = sizeA;
-            sizeA = sizeB;
-            sizeB = temp;
-
-            temp = A;
-            A = B;
-            B = temp;
-
-            temp = velA;
-            velA = velB;
-            velB = temp;
-        }
-
-        // A is left, B is right
-        firstContact.x = Infinity;
-        lastContact.x = Infinity;
-
-        if (B.x >= A.x + sizeA.x){
-            // If we aren't currently colliding
-            let relVel = velA.x - velB.x;
-            
-            if(relVel > 0){
-                // If they are moving towards each other
-                firstContact.x = (B.x - (A.x + (sizeA.x)))/(relVel);
-                lastContact.x = ((B.x + sizeB.x) - A.x)/(relVel);
-            }
-        } else {
-            collidingX = true;
-        }
-
-        if(B.y < A.y){
-            // Swap, because B is above A
-            let temp: Vec2;
-            temp = sizeA;
-            sizeA = sizeB;
-            sizeB = temp;
-
-            temp = A;
-            A = B;
-            B = temp;
-
-            temp = velA;
-            velA = velB;
-            velB = temp;
-        }
-
-        // A is top, B is bottom
-        firstContact.y = Infinity;
-        lastContact.y = Infinity;
-
-        if (B.y >= A.y + sizeA.y){
-            // If we aren't currently colliding
-            let relVel = velA.y - velB.y;
-            
-            if(relVel > 0){
-                // If they are moving towards each other
-                firstContact.y = (B.y - (A.y + (sizeA.y)))/(relVel);
-                lastContact.y = ((B.y + sizeB.y) - A.y)/(relVel);
-            }
-        } else {
-            collidingY = true;
-        }
-
-        if(B.x < A.x){
-            // Swap, because B is to the left of A
-            let temp: Vec2;
-            temp = sizeA;
-            sizeA = sizeB;
-            sizeB = temp;
-
-            temp = A;
-            A = B;
-            B = temp;
-
-            temp = velA;
-            velA = velB;
-            velB = temp;
-        }
 
         if( (firstContact.x < 1 || collidingX) && (firstContact.y < 1 || collidingY)){
             if(collidingX && collidingY){
@@ -174,8 +176,91 @@ export default class PhysicsManager {
             }
         }
     }
+
+    /**
+     * Gets the collision time of two AABBs using continuous collision checking. Returns vectors representing the time
+     * of the start and end of the collision and booleans for whether or not the objects are currently overlapping
+     * (before they move).
+     */
+    getTimeOfCollision(posA: Vec2, sizeA: Vec2, velA: Vec2, posB: Vec2, sizeB: Vec2, velB: Vec2): [Vec2, Vec2, boolean, boolean] {
+        let firstContact = new Vec2(0, 0);
+        let lastContact = new Vec2(0, 0);
+
+        let collidingX = false;
+        let collidingY = false;
+
+        // Sort by position
+        if(posB.x < posA.x){
+            // Swap, because B is to the left of A
+            let temp: Vec2;
+            temp = sizeA;
+            sizeA = sizeB;
+            sizeB = temp;
+
+            temp = posA;
+            posA = posB;
+            posB = temp;
+
+            temp = velA;
+            velA = velB;
+            velB = temp;
         }
 
+        // A is left, B is right
+        firstContact.x = Infinity;
+        lastContact.x = Infinity;
+
+        if (posB.x >= posA.x + sizeA.x){
+            // If we aren't currently colliding
+            let relVel = velA.x - velB.x;
+            
+            if(relVel > 0){
+                // If they are moving towards each other
+                firstContact.x = (posB.x - (posA.x + (sizeA.x)))/(relVel);
+                lastContact.x = ((posB.x + sizeB.x) - posA.x)/(relVel);
+            }
+        } else {
+            collidingX = true;
+        }
+
+        if(posB.y < posA.y){
+            // Swap, because B is above A
+            let temp: Vec2;
+            temp = sizeA;
+            sizeA = sizeB;
+            sizeB = temp;
+
+            temp = posA;
+            posA = posB;
+            posB = temp;
+
+            temp = velA;
+            velA = velB;
+            velB = temp;
+        }
+
+        // A is top, B is bottom
+        firstContact.y = Infinity;
+        lastContact.y = Infinity;
+
+        if (posB.y >= posA.y + sizeA.y){
+            // If we aren't currently colliding
+            let relVel = velA.y - velB.y;
+            
+            if(relVel > 0){
+                // If they are moving towards each other
+                firstContact.y = (posB.y - (posA.y + (sizeA.y)))/(relVel);
+                lastContact.y = ((posB.y + sizeB.y) - posA.y)/(relVel);
+            }
+        } else {
+            collidingY = true;
+        }
+
+        return [firstContact, lastContact, collidingX, collidingY];
+    }
+}
+
+// Helper classes for internal data
 class MovementData{
     node: PhysicsNode;
     velocity: Vec2;
@@ -184,3 +269,12 @@ class MovementData{
         this.velocity = velocity;
     }
 }
+
+class TileCollisionData {
+    position: Vec2;
+    overlapArea: number;
+    constructor(position: Vec2, overlapArea: number){
+        this.position = position;
+        this.overlapArea = overlapArea;
+    }
+}

src/Player.ts

@@ -16,7 +16,7 @@ export default class Player extends PhysicsNode {
         super();
         this.type = type;
         this.velocity = new Vec2(0, 0);
-        this.speed = 500;
+        this.speed = 600;
         this.size = new Vec2(50, 50);
         this.collider = new AABB();
         this.collider.setSize(this.size);

src/main.ts

@@ -74,12 +74,12 @@ function main(){
         pauseMenu.disable();
     }
 
-    // backgroundScene.tilemap.add(OrthogonalTilemap, "assets/tilemaps/Background.json");
+    backgroundScene.tilemap.add(OrthogonalTilemap, "assets/tilemaps/Background.json");
-    // mainScene.tilemap.add(OrthogonalTilemap, "assets/tilemaps/Platformer.json");
+    mainScene.tilemap.add(OrthogonalTilemap, "assets/tilemaps/Platformer.json");
-    // let player = mainScene.physics.add(Player, "platformer");
+    let player = mainScene.physics.add(Player, "platformer");
 
-    mainScene.tilemap.add(OrthogonalTilemap, "assets/tilemaps/TopDown.json");
+    // mainScene.tilemap.add(OrthogonalTilemap, "assets/tilemaps/TopDown.json");
-    let player = mainScene.physics.add(Player, "topdown");
+    // let player = mainScene.physics.add(Player, "topdown");
 
     mainScene.getViewport().follow(player);
 

tsconfig.json

@@ -29,7 +29,7 @@
         
         "src/Loop/GameLoop.ts",
 
-        "src/Nodes/Tilemaps/OrgthogonalTilemap.ts",
+        "src/Nodes/Tilemaps/OrthogonalTilemap.ts",
         "src/Nodes/UIElements/Button.ts",
         "src/Nodes/UIElements/Label.ts",
         "src/Nodes/CanvasNode.ts",