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import { Game } from ".";
import { Miscellaneous, loadAssets } from "./config";
import { Player, FunctionBox } from "./entities";
import { FacingDirection, Input, Render } from "./systems";
import { Grid } from "./systems/Grid";
export class TheAbstractionEngine {
private game: Game;
private ctx: CanvasRenderingContext2D;
private animationFrameId: number | null;
constructor(game: Game, ctx: CanvasRenderingContext2D) {
this.game = game;
this.ctx = ctx;
this.animationFrameId = null;
}
public async init() {
await loadAssets();
const inputSystem = new Input();
this.addWindowEventListenersToInputSystem(inputSystem);
const facingDirectionSystem = new FacingDirection(inputSystem);
[
new Render(this.ctx),
inputSystem,
facingDirectionSystem,
new Grid(
{ width: Miscellaneous.GRID_COLUMNS, height: Miscellaneous.GRID_ROWS },
{
width: Miscellaneous.GRID_CELL_WIDTH,
height: Miscellaneous.GRID_CELL_HEIGHT,
},
),
].forEach((system) => this.game.addSystem(system));
const player = new Player();
this.game.addEntity(player);
const box = new FunctionBox({ x: 3, y: 1 }, "λ x . (x)");
this.game.addEntity(box);
const box2 = new FunctionBox({ x: 4, y: 1 }, "λ x . (x)");
this.game.addEntity(box2);
}
public play() {
this.game.start();
const loop = (timestamp: number) => {
this.game.doGameLoop(timestamp);
this.animationFrameId = requestAnimationFrame(loop); // tail call recursion! /s
};
this.animationFrameId = requestAnimationFrame(loop);
}
public stop() {
if (this.animationFrameId) {
cancelAnimationFrame(this.animationFrameId);
this.animationFrameId = null;
}
}
private addWindowEventListenersToInputSystem(input: Input) {
window.addEventListener("keydown", (e) => {
if (!e.repeat) {
input.keyPressed(e.key.toLowerCase());
}
});
window.addEventListener("keyup", (e) =>
input.keyReleased(e.key.toLowerCase()),
);
window.addEventListener("blur", () => input.clearKeys());
window.addEventListener("mousemove", (e) => {
const canvas = this.ctx.canvas;
const rect = canvas.getBoundingClientRect();
const scaleX = canvas.width / rect.width;
const scaleY = canvas.height / rect.height;
const x = (e.clientX - rect.left) * scaleX;
const y = (e.clientY - rect.top) * scaleY;
input.setMousePosition({ x, y });
});
}
}
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