const canvas = document.getElementById('canvas'); const ctx = canvas.getContext('2d'); let playerX = canvas.width/2; let playerY = canvas.height/2; let playerSpeed = 5; let playerSize = 20; let bulletSpeed = 5; let bulletSize = 5; let bulletCooldown = 0; let bullets = []; let enemySpeed = 2; let enemySize = 20; let enemyCooldown = 0; let enemies = []; let score = 0; let difficulty = 1; function drawPlayer() { ctx.fillStyle = 'white'; ctx.beginPath(); ctx.arc(playerX, playerY, playerSize, 0, Math.PI*2); ctx.fill(); } function drawBullets() { ctx.fillStyle = 'white'; for(let i = 0; i < bullets.length; i++) { ctx.beginPath(); ctx.arc(bullets[i].x, bullets[i].y, bulletSize, 0, Math.PI*2); ctx.fill(); } } function drawEnemies() { ctx.fillStyle = 'red'; for(let i = 0; i < enemies.length; i++) { ctx.beginPath(); ctx.arc(enemies[i].x, enemies[i].y, enemySize, 0, Math.PI*2); ctx.fill(); } } function moveBullets() { for(let i = 0; i < bullets.length; i++) { bullets[i].x += bullets[i].vx; bullets[i].y += bullets[i].vy; if(bullets[i].x < 0 || bullets[i].x > canvas.width || bullets[i].y < 0 || bullets[i].y > canvas.height) { bullets.splice(i, 1); i--; } } } function moveEnemies() { for(let i = 0; i < enemies.length; i++) { enemies[i].x += enemies[i].vx; enemies[i].y += enemies[i].vy; if(enemies[i].x < 0 || enemies[i].x > canvas.width || enemies[i].y < 0 || enemies[i].y > canvas.height) { enemies.splice(i, 1); i--; } } } function spawnEnemy() { let side = Math.floor(Math.random() * 4); let x, y, vx, vy; switch(side) { case 0: // top x = Math.random() * canvas.width; y = 0; vx = 0; vy = enemySpeed; break; case 1: // right x = canvas.width; y = Math.random() * canvas.height; vx = -enemySpeed; vy = 0; break; case 2: // bottom x = Math.random() * canvas.width; y = canvas.height; vx = 0; vy = -enemySpeed; break; case 3: // left x = 0; y = Math.random() * canvas.height; vx = enemySpeed; vy = 0; break; } enemies.push({x: x, y: y, vx: vx, vy: vy}); } function checkCollisions() { for(let i = 0; i < bullets.length; i++) { for(let j = 0; j < enemies.length; j++) { let dx = bullets[i].x - enemies[j].x; let dy = bullets[i].y - enemies[j].y; let distance = Math.sqrt(dx*dx + dy*dy); if(distance < bulletSize + enemySize) { bullets.splice(i, 1); i--; enemies.splice(j, 1); j--; score++; } } } for(let i = 0; i < enemies.length; i++) { let dx = playerX - enemies[i].x; let dy = playerY - enemies[i].y; let distance = Math.sqrt(dx*dx + dy*dy); if(distance < playerSize + enemySize) { gameOver(); } } } function gameOver() { clearInterval(gameLoop); alert('Game Over! Your score is ' + score); } function update() { ctx.clearRect(0, 0, canvas.width, canvas.height); drawPlayer(); drawBullets(); drawEnemies(); moveBullets(); moveEnemies(); checkCollisions(); bulletCooldown--; enemyCooldown--; if(bulletCooldown <= 0) { bullets.push({x: playerX, y: playerY, vx: 0, vy: -bulletSpeed}); bulletCooldown = 10; } if(enemyCooldown <= 0) { spawnEnemy(); enemyCooldown = 60 / difficulty; } difficulty += 0.01; } function keyDownHandler(event) { switch(event.keyCode) { case 37: // left arrow playerX -= playerSpeed; break; case 38: // up arrow playerY -= playerSpeed; break; case 39: // right arrow playerX += playerSpeed; break; case 40: // down arrow playerY += playerSpeed; break; } } document.addEventListener('keydown', keyDownHandler); let gameLoop = setInterval(update, 1000/60);

GPTgame

Sign up for free tokens!

Bullet hell with free movment that gets harder over time

GPTgame