salva-la-costanera/src/main.ts

import "./style.css";

import * as welcome from "./welcome";
import * as jugando from "./jugando";
import * as win from "./win";
import * as lose from "./lose";
import { Assets, loadAssets } from "./assets";
import { loadSprite, Sprite } from "./sprite";

export type State = welcome.State | jugando.State | win.State | lose.State;

export type Juego<T extends State> = {
  canvas: HTMLCanvasElement;
  ctx: CanvasRenderingContext2D;
  assets: Assets;
  sprites: {
    [key in
      | "jugadorx"
      | "baldosa"
      | "larreta"
      | "semilla"
      | "arbol1"
      | "arbol2"]: Sprite;
  };
  mouse: { x: number; y: number; down: boolean };
  keyboard: { keys: { [key: string]: boolean } };
  state: T;
};

function update(juego: Juego<any>, dt: number) {
  switch (juego.state.current) {
    case "welcome":
      welcome.update(juego, dt);
      break;
    case "jugando":
      jugando.update(juego, dt);
      break;
    case "win":
      win.update(juego, dt);
      break;
    case "lose":
      lose.update(juego, dt);
      break;
  }
}

function draw(juego: Juego<any>, timestamp: number) {
  const { width, height } = juego.canvas;

  juego.ctx.fillStyle = "white";
  juego.ctx.fillRect(0, 0, width, height);
  juego.ctx.fillStyle = "black";
  switch (juego.state.current) {
    case "welcome":
      welcome.draw(juego, timestamp);
      break;
    case "jugando":
      jugando.draw(juego, timestamp);
      break;
    case "win":
      win.draw(juego, timestamp);
      break;
    case "lose":
      lose.draw(juego, timestamp);
      break;
  }
}

function resizeCanvas(canvas: HTMLCanvasElement) {
  canvas.width = canvas.clientWidth;
  canvas.height = canvas.clientHeight;
}

async function initJuego() {
  const canvas = document.querySelector<HTMLCanvasElement>("#juego")!;
  const ctx = canvas.getContext("2d", {
    alpha: false,
    desynchronized: true,
  })!;

  window.addEventListener("resize", () => resizeCanvas(canvas), false);
  resizeCanvas(canvas);

  const assets = await loadAssets();

  const sprites = {
    jugadorx: loadSprite(
      assets.jugadorx,
      65,
      94,
      (juego) => juego.canvas.height / 4
    ),
    baldosa: loadSprite(
      assets.baldosa,
      72,
      72,
      (juego) => juego.canvas.height * 0.8
    ),
    larreta: loadSprite(
      assets.larreta,
      50,
      71,
      (juego) => juego.canvas.height / 4
    ),
    semilla: loadSprite(
      assets.semilla,
      72,
      73,
      (juego) => juego.canvas.height / 8
    ),
    arbol1: loadSprite(
      assets.arbol1,
      72,
      68,
      (juego) => juego.canvas.height / 3
    ),
    arbol2: loadSprite(
      assets.arbol2,
      72,
      56,
      (juego) => juego.canvas.height / 4
    ),
  };

  let juego: Juego<welcome.State> = {
    canvas,
    ctx,
    assets,
    sprites,
    mouse: { x: 0, y: 0, down: false },
    keyboard: { keys: {} },
    state: {
      current: "welcome",
    },
  };
  (window as any).juego = juego;
  juego.ctx.imageSmoothingEnabled = false;

  canvas.addEventListener(
    "mousemove",
    (e) => {
      juego.mouse.x = e.clientX;
      juego.mouse.y = e.clientY;
    },
    false
  );
  canvas.addEventListener(
    "mousedown",
    () => {
      juego.mouse.down = true;
    },
    false
  );
  canvas.addEventListener(
    "mouseup",
    () => {
      juego.mouse.down = false;
    },
    false
  );
  window.addEventListener("keydown", (e) => {
    juego.keyboard.keys[e.key] = true;
  });
  window.addEventListener("keyup", (e) => {
    juego.keyboard.keys[e.key] = false;
  });

  let lastRender = 0;
  const loop: FrameRequestCallback = (timestamp) => {
    const progress = timestamp - lastRender;

    update(juego, progress);
    draw(juego, timestamp);

    lastRender = timestamp;
    window.requestAnimationFrame(loop);
  };

  window.requestAnimationFrame(loop);
}
initJuego();