Implement more flexible handling of entities and collidables

dist/resources/entity/green_circle.json

@@ -0,0 +1,3 @@
+{
+	"sprite": "green_circle"
+}

dist/resources/entity/red_circle.json

@@ -0,0 +1,14 @@
+{
+	"sprite": "red_circle",
+	"collision": [
+		{
+			"type": "polygon",
+			"vertices": [
+				[-0.5, -0.5],
+				[-0.5, 0.5],
+				[0.5, 0.5],
+				[0.5, -0.5]
+			]
+		}
+	]
+}

src/controller/collision.ts

@@ -0,0 +1,59 @@
+import { Collision } from '../model/data/collision';
+
+import { Collidable } from '../math/collision';
+import { LineSegment, Movement } from '../math/line';
+import { Point } from '../math/point';
+
+import { vec2 } from 'gl-matrix';
+
+export function mkCollision(collision: Collision[]): Collidable[] {
+	const ret: Collidable[] = [];
+
+	for (const c of collision) {
+		switch (c.type) {
+		case 'polygon':
+			if (!c.vertices.length)
+				continue;
+
+			let prev = c.vertices[c.vertices.length - 1];
+
+			for (const v of c.vertices) {
+				ret.push(LineSegment.fromPoints(vec2.clone(prev), vec2.clone(v)));
+				prev = v;
+			}
+
+			for (const v of c.vertices) {
+				ret.push(new Point(vec2.clone(v)));
+				prev = v;
+			}
+		}
+	}
+
+	return ret;
+}
+
+export interface CollidableGroup {
+	getTranslation(): vec2|null;
+	getCollidables(): Collidable[];
+}
+
+export function collide(collision: CollidableGroup, out: vec2, move: Movement, radius: number): boolean {
+	const t = collision.getTranslation();
+	if (t)
+		move = move.translate(vec2.negate(vec2.create(), t));
+
+	for (const c of collision.getCollidables()) {
+		if (!c.collide(out, move, radius))
+			continue;
+
+		if (vec2.squaredDistance(move.src, out) >= vec2.squaredDistance(move.src, move.dest))
+			continue;
+
+		if (t)
+			vec2.add(out, out, t);
+
+		return true;
+	}
+
+	return false;
+}

src/controller/entitycontext.ts

@@ -0,0 +1,45 @@
+import { EntityData } from '../model/data/entity';
+
+import { loadEntity } from '../view/entity';
+import { Renderer } from '../view/renderer/renderer';
+import { SpriteView } from '../view/sprite';
+
+import { Collidable } from '../math/collision';
+
+import { getJSON } from '../util';
+import { CollidableGroup, mkCollision } from './collision';
+
+import { vec2 } from 'gl-matrix';
+
+export class EntityContext implements CollidableGroup {
+	public static async load(renderer: Renderer, name: string): Promise<EntityContext> {
+		const entity = new EntityData(await getJSON(`resources/entity/${name}.json`));
+
+		return new EntityContext(
+			renderer,
+			await loadEntity(renderer, entity),
+			mkCollision(entity.collision),
+		);
+	}
+
+	public readonly pos: vec2 = vec2.create();
+
+	private constructor(
+		private readonly renderer: Renderer,
+		private readonly view: SpriteView,
+		public readonly collision: Collidable[],
+	) {}
+
+	public render() {
+		this.renderer.setTranslation(this.pos);
+		this.view.render();
+	}
+
+	public getTranslation(): vec2 {
+		return this.pos;
+	}
+
+	public getCollidables(): Collidable[] {
+		return this.collision;
+	}
+}

src/controller/gamecontext.ts

@@ -1,60 +1,44 @@
-import { Collision, MapData } from '../model/data/map';
+import { CollidableGroup, collide, mkCollision } from './collision';
+import { EntityContext } from './entitycontext';
+
+import { MapData } from '../model/data/map';
 
-import { loadSimpleEntity } from '../view/entity';
 import { DirectionHandler } from '../view/input/directionhandler';
 import { loadMap } from '../view/map';
 import { Renderer } from '../view/renderer/renderer';
 import { SpriteView } from '../view/sprite';
 
 import { Collidable } from '../math/collision';
-import { LineSegment, Movement } from '../math/line';
-import { Point } from '../math/point';
+import { Movement } from '../math/line';
 import { getJSON } from '../util';
 
 import { vec2 } from 'gl-matrix';
 
-export class GameContext {
+export class GameContext implements CollidableGroup {
 	public static async load(renderer: Renderer): Promise<GameContext> {
-		const entity = loadSimpleEntity(renderer, 'simple_circle');
-		const [mapView, collision] = await this.loadMap(renderer);
+		const map = this.loadMap(renderer, 'test');
+		const loadPlayer = EntityContext.load(renderer, 'green_circle');
+		const loadEntity = EntityContext.load(renderer, 'red_circle');
+
+		const [mapView, mapCollision] = await map;
+		const player = await loadPlayer;
+		const entity = await loadEntity;
+
+		vec2.set(player.pos, 6, 6);
+		vec2.set(entity.pos, 3, 3);
 
 		return new GameContext(
 			renderer,
 			mapView,
-			await entity,
-			collision,
+			player,
+			[entity],
+			mapCollision,
 		);
 	}
 
-	private static mkCollision(collision: Collision[]): Collidable[] {
-		const ret: Collidable[] = [];
-
-		for (const c of collision) {
-			switch (c.type) {
-			case 'polygon':
-				if (!c.vertices.length)
-					continue;
-
-				let prev = c.vertices[c.vertices.length - 1];
-
-				for (const v of c.vertices) {
-					ret.push(LineSegment.fromPoints(vec2.clone(prev), vec2.clone(v)));
-					prev = v;
-				}
-
-				for (const v of c.vertices) {
-					ret.push(new Point(vec2.clone(v)));
-					prev = v;
-				}
-			}
-		}
-
-		return ret;
-	}
-
-	private static async loadMap(renderer: Renderer): Promise<[SpriteView, Collidable[]]> {
-		const map = new MapData(await getJSON('resources/map/test.json'));
-		return [await loadMap(renderer, map), this.mkCollision(map.collision)];
+	private static async loadMap(renderer: Renderer, name: string): Promise<[SpriteView, Collidable[]]> {
+		const map = new MapData(await getJSON(`resources/map/${name}.json`));
+		return [await loadMap(renderer, map), mkCollision(map.collision)];
 	}
 
 	private time: number|null = null;
@@ -65,28 +49,36 @@ export class GameContext {
 
 	private readonly input: DirectionHandler;
 
-	private readonly entityPos: vec2 = vec2.clone([6, 6]);
-	private readonly entityMovement: vec2 = vec2.create();
+	private readonly playerMovement: vec2 = vec2.create();
 
 	private readonly collisionRadius = 7 / 16;
 
 	private constructor(
 		private readonly renderer: Renderer,
 		private readonly mapView: SpriteView,
-		private readonly entity: SpriteView,
+		private readonly player: EntityContext,
+		private readonly entities: EntityContext[],
 		private readonly collision: Collidable[],
 	) {
 		this.input = new DirectionHandler();
 		this.input.addListener((v) => {
 			if (vec2.sqrLen(v) > 0)
-				vec2.normalize(this.entityMovement, v);
+				vec2.normalize(this.playerMovement, v);
 			else
-				vec2.copy(this.entityMovement, [0, 0]);
+				vec2.copy(this.playerMovement, [0, 0]);
 		});
 
 		window.requestAnimationFrame(this.render);
 	}
 
+	public getTranslation(): null {
+		return null;
+	}
+
+	public getCollidables(): Collidable[] {
+		return this.collision;
+	}
+
 	private updateTime(time: number): number {
 		const diff = this.time !== null ? time - this.time : 0;
 		this.time = time;
@@ -95,41 +87,39 @@ export class GameContext {
 	}
 
 	private updateStepCollide(out: vec2, dest: vec2): boolean {
-		const move = new Movement(this.entityPos, dest);
+		const move = new Movement(this.player.pos, dest);
 
-		for (const c of this.collision) {
-			if (!c.collide(out, move, this.collisionRadius))
-				continue;
+		for (const c of [this, ...this.entities]) {
+			if (collide(c, out, move, this.collisionRadius)) {
+				if (vec2.squaredDistance(move.src, out) >= vec2.squaredDistance(move.src, move.dest))
+					continue;
 
-			if (vec2.squaredDistance(this.entityPos, out) >= vec2.squaredDistance(this.entityPos, dest))
-				continue;
-
-			return true;
+				return true;
+			}
 		}
 
 		return false;
 	}
 
 	private updateStep(): void {
-		const dest = vec2.scaleAndAdd(vec2.create(), this.entityPos, this.entityMovement, this.speed);
+		const dest = vec2.scaleAndAdd(vec2.create(), this.player.pos, this.playerMovement, this.speed);
 		const newDest = vec2.create();
 
 		while (this.updateStepCollide(newDest, dest)) {
-			if (vec2.equals(newDest, this.entityPos))
+			if (vec2.equals(newDest, this.player.pos))
 				return;
 
 			vec2.copy(dest, newDest);
-
 		}
 
-		vec2.copy(this.entityPos, dest);
+		vec2.copy(this.player.pos, dest);
 	}
 
 	private update(time: number): void {
 		const diff = Math.min(this.maxSkip, this.updateTime(time));
 
-		if (vec2.sqrLen(this.entityMovement) === 0) {
-			this.renderer.snapToGrid(this.entityPos, this.entityPos);
+		if (vec2.sqrLen(this.playerMovement) === 0) {
+			this.renderer.snapToGrid(this.player.pos, this.player.pos);
 			return;
 		}
 
@@ -140,13 +130,13 @@ export class GameContext {
 	private render = (time: number) => {
 		this.update(Math.round(time / this.tick));
 
-		this.renderer.setCenter(this.entityPos);
+		this.renderer.setCenter(this.player.pos);
 		this.renderer.clear();
 
 		this.mapView.render();
 
-		this.renderer.setTranslation(this.entityPos);
-		this.entity.render();
+		for (const r of [...this.entities, this.player])
+			r.render();
 
 		window.requestAnimationFrame(this.render);
 	}

src/model/data/collision.ts

@@ -0,0 +1,6 @@
+export interface CollisionPolygon {
+	readonly type: 'polygon';
+	readonly vertices: Array<[number, number]>;
+}
+
+export type Collision = CollisionPolygon;

src/model/data/entity.ts

@@ -0,0 +1,19 @@
+import { Collision } from './collision';
+
+export interface EntityDataInput {
+	readonly sprite: string;
+	readonly anchor?: [number, number];
+	readonly collision?: Collision[];
+}
+
+export class EntityData {
+	public readonly sprite: string;
+	public readonly anchor: [number, number];
+	public readonly collision: Collision[];
+
+	constructor(input: EntityDataInput) {
+		this.sprite = input.sprite;
+		this.anchor = input.anchor || [0.5, 0.5];
+		this.collision = input.collision || [];
+	}
+}

src/model/data/map.ts

@@ -1,11 +1,6 @@
-export interface CollisionPolygon {
-	readonly type: 'polygon';
-	readonly vertices: Array<[number, number]>;
-}
+import { Collision } from './collision';
 
-export type Collision = CollisionPolygon;
-
-export interface Input {
+export interface MapDataInput {
 	readonly tiles: string[];
 	readonly layers: number[][][];
 	readonly collision: Collision[];
@@ -19,7 +14,7 @@ export class MapData {
 	public readonly width: number;
 	public readonly height: number;
 
-	constructor(data: Input) {
+	constructor(data: MapDataInput) {
 		this.tiles = data.tiles;
 		this.layers = data.layers;
 		this.collision = data.collision;

src/view/entity.ts

@@ -1,16 +1,16 @@
+import { EntityData } from '../model/data/entity';
 import { Renderer } from './renderer/renderer';
 import { SpriteView, SpriteViewBuilder } from './sprite';
 import { loadImage, mkTexture } from './util/image';
 
-export async function loadSimpleEntity(
+export async function loadEntity(
 	r: Renderer,
-	sprite: string,
-	anchor: [number, number] = [0.5, 0.5],
+	data: EntityData,
 ): Promise<SpriteView> {
-	const tile = await loadImage(`resources/sprite/entity/${sprite}.png`);
+	const tile = await loadImage(`resources/sprite/entity/${data.sprite}.png`);
 	const texture = mkTexture(r.getContext(), tile);
 
-	const [x, y] = anchor;
+	const [x, y] = data.anchor;
 
 	const builder = new SpriteViewBuilder(r, texture);
 	builder.addSprite([-x, -y, -x + 1, -y + 1], [0, 0, 1, 1]);