Abstract Display

src/display.ts

@@ -1,6 +1,42 @@
 import { Point } from "./point.ts";
 
-export class Display {
+export interface Display {
+  readonly canvasSize: Point;
+
+  clearRect(corner: Point, size: Point): void;
+
+  strokeRect(corner: Point, size: Point): void;
+
+  translate(dist: Point): void;
+
+  scale(amount: Point): void;
+
+  restore(): void;
+
+  save(): void;
+
+  stroke(): void;
+
+  beginPath(): void;
+
+  closePath(): void;
+
+  moveTo(point: Point): void;
+
+  lineTo(point: Point): void;
+
+  fill(): void;
+
+  bezierCurveTo(cp1: Point, cp2: Point, ep: Point): void;
+
+  quadraticCurveTo(cp: Point, ep: Point): void;
+
+  set lineWidth(width: number);
+
+  set strokeStyle(style: string);
+}
+
+export class DisplayImpl implements Display {
   constructor(
     public readonly canvasSize: Point,
     private readonly context: CanvasRenderingContext2D,
@@ -18,10 +54,6 @@ export class Display {
     this.context.translate(dist.x, dist.y);
   }
 
-  rotate(rads: number) {
-    this.context.rotate(rads);
-  }
-
   scale(amount: Point) {
     this.context.scale(amount.x, amount.y);
   }

src/main.ts

@@ -1,5 +1,5 @@
 import { Game } from "./game.ts";
-import { Display } from "./display.ts";
+import { DisplayImpl } from "./display.ts";
 import { GameTextImpl } from "./gametext.ts";
 import { KeyboardImpl } from "./keyboard.ts";
 import { Point } from "./point.ts";
@@ -13,7 +13,7 @@ const canvas: HTMLCanvasElement = document.getElementById(
   "canvas",
 )! as HTMLCanvasElement;
 
-const display = new Display(
+const display = new DisplayImpl(
   new Point(canvas.width, canvas.height),
   canvas.getContext("2d")!,
 );