Allow interacting with entities

src/controller/gamecontext.ts

@@ -3,7 +3,7 @@ import { EntityContext } from './entitycontext';
 
 import { MapData } from '../model/data/map';
 
-import { DirectionHandler } from '../view/input/directionhandler';
+import { ButtonCode, GameInputHandler } from '../view/input/gameinput';
 import { loadMap } from '../view/map';
 import { Renderer } from '../view/renderer/renderer';
 import { SpriteView } from '../view/sprite';
@@ -44,14 +44,16 @@ export class GameContext implements CollidableGroup {
 	private time: number|null = null;
 
 	private readonly tick = 10; // ms per tick
-	private readonly speed = 0.04; // movement per tick
+	private readonly maxSpeed = 0.04; // movement per tick
 	private readonly maxSkip = 20; // maximum ticks to process in a single render step
 
-	private readonly input: DirectionHandler;
+	private readonly input: GameInputHandler;
 
-	private readonly playerMovement: vec2 = vec2.create();
+	private readonly playerDir: vec2 = vec2.fromValues(0, 1);
+	private speed: number = 0;
 
 	private readonly collisionRadius = 7 / 16;
+	private readonly interactLength = 1 / 32;
 
 	private constructor(
 		private readonly renderer: Renderer,
@@ -60,12 +62,23 @@ export class GameContext implements CollidableGroup {
 		private readonly entities: EntityContext[],
 		private readonly collision: Collidable[],
 	) {
-		this.input = new DirectionHandler();
-		this.input.addListener((v) => {
-			if (vec2.sqrLen(v) > 0)
-				vec2.normalize(this.playerMovement, v);
-			else
-				vec2.copy(this.playerMovement, [0, 0]);
+		this.input = new GameInputHandler();
+		this.input.addListener((input) => {
+			switch (input.type) {
+			case 'button':
+				if (input.button === ButtonCode.Action)
+					this.interact();
+				break;
+
+			case 'direction':
+				if (vec2.sqrLen(input.direction) > 0) {
+					vec2.copy(this.playerDir, input.direction);
+					this.speed = this.maxSpeed;
+				} else {
+					this.speed = 0;
+				}
+				break;
+			}
 		});
 
 		window.requestAnimationFrame(this.render);
@@ -86,6 +99,23 @@ export class GameContext implements CollidableGroup {
 		return diff;
 	}
 
+	private canInteract(c: CollidableGroup): boolean {
+		const dest = vec2.scaleAndAdd(vec2.create(), this.player.pos, this.playerDir, this.interactLength);
+		const move = new Movement(this.player.pos, dest);
+
+		return collide(c, vec2.create(), move, this.collisionRadius);
+	}
+
+	private interact(): void {
+		for (const e of this.entities) {
+			if (!this.canInteract(e))
+				continue;
+
+			e.interact();
+			break;
+		}
+	}
+
 	private updateStepCollide(out: vec2, dest: vec2): boolean {
 		const move = new Movement(this.player.pos, dest);
 
@@ -102,7 +132,7 @@ export class GameContext implements CollidableGroup {
 	}
 
 	private updateStep(): void {
-		const dest = vec2.scaleAndAdd(vec2.create(), this.player.pos, this.playerMovement, this.speed);
+		const dest = vec2.scaleAndAdd(vec2.create(), this.player.pos, this.playerDir, this.speed);
 		const newDest = vec2.create();
 
 		while (this.updateStepCollide(newDest, dest)) {
@@ -118,7 +148,7 @@ export class GameContext implements CollidableGroup {
 	private update(time: number): void {
 		const diff = Math.min(this.maxSkip, this.updateTime(time));
 
-		if (vec2.sqrLen(this.playerMovement) === 0) {
+		if (!this.speed) {
 			this.renderer.snapToGrid(this.player.pos, this.player.pos);
 			return;
 		}