Example: exbounce

Console

import "allegro-ts/global";
import { screen } from "allegro-ts";

// bitmap oobjects
let clouds!: BITMAP;
let ball!: BITMAP;

// sample object
let bounce!: SAMPLE;

// size and speed of the ball
const speed = 5;

// positon of the ball
let cx = 100,
  cy = 100;

// velocity of the ball
let vx = speed,
  vy = speed;

// drawing function
function draw() {
  // draw allegro clouds background
  stretch_blit(clouds, screen.value, 0, 0, clouds.w, clouds.h, 0, 0, SCREEN_W.value, SCREEN_H.value);

  // draws the ball centered
  if (key[KEY_Q]) {
    rotate_sprite(screen.value, ball, cx, cy, retrace_count.value % 360);
  } else if (key[KEY_W]) {
    rotate_scaled_sprite(screen.value, ball, cx, cy, retrace_count.value % 360, 10);
  } else if (key[KEY_E]) {
    rotate_sprite_v_flip(screen.value, ball, cx, cy, retrace_count.value % 360);
  } else if (key[KEY_R]) {
    draw_sprite_v_flip(screen.value, ball, cx, cy);
  } else if (key[KEY_T]) {
    rotate_scaled_sprite(screen.value, ball, cx, cy, 0, 10);
  } else {
    draw_sprite(screen.value, ball, cx, cy);
  }
}

// update game logic
function update() {
  // did the ball bounce off the wall this turn?
  let bounced = false;

  // if the ball is going to collide with screen bounds
  // after applying velocity, if so, reverse velocity
  // and remember that it bonced
  if (cx + vx > SCREEN_W.value) {
    vx = -speed;
    bounced = true;
  }
  if (cy + vy > SCREEN_H.value) {
    vy = -speed * 3;
    bounced = true;
  }
  if (cx + vx < 0) {
    vx = speed;
    bounced = true;
  }
  if (cy + vy < 0) {
    vy = speed;
    bounced = true;
  }

  // move the ball
  cx += vx;
  cy += vy;

  // if it bounced, play a sound
  if (bounced) play_sample(bounce);

  // add gravity
  vy += 0.3;
}

// entry point of our example
async function main() {
  allegro_init();

  // make the dimesnions 640x480
  set_gfx_mode(GFX_AUTODETECT_WINDOWED, 640, 480, 0, 0);

  set_display_switch_mode(SWITCH_PAUSE);

  install_sound(DIGI_AUTODETECT, DIGI_AUTODETECT, null);

  install_keyboard();

  install_timer();

  // load ball image
  ball = await load_bmp("assets/planet.png");

  // load background image
  clouds = await load_bmp("assets/clouds.png");

  // load the bounce sound
  bounce = await load_sample("assets/bounce.mp3");

  // repeat this game loop
  while (!key[KEY_ESC]) {
    // clear screen
    clear_to_color(screen.value, makecol(255, 255, 255));

    // update game logic
    update();

    // render everything
    draw();

    // all this happens 60 times per second
    await rest(16);
  }

  // the end
  return 0;
}
// make sure that main() gets called as soon as the wesbite has loaded
END_OF_MAIN();

// Start
export const run = () => {
  init_allegro_ts("canvas_id", main, {
    debug_element: "debug",
  });
};

View source on GitHub