namastejs/src/games/invaders/systems/movement.js

A spiritual greeting from your JavaScript code. Because every function deserves a 'Namaste 🙏'

const {
  SCREEN_WIDTH,
  ENEMY_MOVE_INTERVAL,
  SCREEN_HEIGHT,
} = require("../config");

function moveEnemies(state) {
  state.enemyMoveTick++;

  if (state.enemyMoveTick < ENEMY_MOVE_INTERVAL) return;
  state.enemyMoveTick = 0;

  let hitWall = false;

  state.enemies.forEach((e) => {
    if (!e.alive) return;

    e.x += state.enemyDirection;

    if (e.x <= 0 || e.x >= SCREEN_WIDTH - 1) {
      hitWall = true;
    }
  });

  if (hitWall) {
    state.enemyDirection *= -1;
    state.enemies.forEach((e) => {
      e.y += 1;
    });
  }
}

function moveBullets(state) {
  state.bullets = state.bullets.filter((b) => {
    b.y += b.dy;
    return b.y >= 0;
  });

  if (state.bulletCooldown > 0) {
    state.bulletCooldown--;
  }
}

function moveEnemyBullets(state) {
  state.enemyBullets = state.enemyBullets.filter((b) => {
    b.y += b.dy;
    return b.y < SCREEN_HEIGHT && b.alive;
  });
}

module.exports = {
  moveEnemies,
  moveBullets,
  moveEnemyBullets,
};