<!DOCTYPE html>
<html>
<head>
<title>Shooter Game</title>
<style>
#game-canvas {
border: 1px solid #000;
}
</style>
</head>
<body>
<canvas id="game-canvas" width="800" height="400"></canvas>
<script>
// Get the canvas element
const canvas = document.getElementById("game-canvas");
const context = canvas.getContext("2d");
// Game constants
const PLAYER_WIDTH = 50;
const PLAYER_HEIGHT = 50;
const BULLET_WIDTH = 10;
const BULLET_HEIGHT = 10;
const ENEMY_WIDTH = 30;
const ENEMY_HEIGHT = 30;
const ENEMY_SPEED = 2;
const BULLET_SPEED = 5;
// Game objects
let player = {
x: 0,
y: canvas.height / 2 - PLAYER_HEIGHT / 2,
width: PLAYER_WIDTH,
height: PLAYER_HEIGHT,
color: "#00f"
};
let bullets = [];
let enemies = [];
let score = 0;
// Handle key press events
document.addEventListener("keydown", function (event) {
if (event.key === " ") {
event.preventDefault();
bullets.push({
x: player.x + player.width,
y: player.y + player.height / 2 - BULLET_HEIGHT / 2,
width: BULLET_WIDTH,
height: BULLET_HEIGHT,
color: "#f00"
});
}
});
// Update game logic
function update() {
// Update player position
if (player.y > 0 && player.y < canvas.height - player.height) {
if (keys[38]) { // Up arrow
player.y -= 3;
}
if (keys[40]) { // Down arrow
player.y += 3;
}
}
// Update bullets
for (let i = 0; i < bullets.length; i++) {
bullets[i].x += BULLET_SPEED;
// Remove bullet if it goes off-screen
if (bullets[i].x > canvas.width) {
bullets.splice(i, 1);
i--;
}
}
// Update enemies
for (let i = 0; i < enemies.length; i++) {
enemies[i].x -= ENEMY_SPEED;
// Check for collision with player
if (collide(player, enemies[i])) {
gameOver();
return;
}
// Check for collision with bullets
for (let j = 0; j < bullets.length; j++) {
if (collide(bullets[j], enemies[i])) {
bullets.splice(j, 1);
j--;
enemies.splice(i, 1);
i--;
score++;
break;
}
}
// Remove enemy if it goes off-screen
if (enemies[i] && enemies[i].x + enemies[i].width < 0) {
enemies.splice(i, 1);
i--;
}
}
// Add new enemies
if (Math.random() < 0.01) {
enemies.push({
x: canvas.width,
y: Math.random() * canvas.height,
width: ENEMY_WIDTH,
height: ENEMY_HEIGHT,
color: "#" + ((1 << 24) * Math.random() | 0).toString(16)
});
}
}
// Render game state
function render() {
// Clear canvas
context.clearRect(0, 0, canvas.width, canvas.height);
// Draw player
context.fillStyle = player.color;
context.fillRect(player.x, player.y, player.width, player.height);
// Draw bullets
context.fillStyle = "#f00";
for (let i = 0; i < bullets.length; i++) {
context.fillRect(bullets[i].x, bullets[i].y, bullets[i].width, bullets[i].height);
}
// Draw enemies
for (let i = 0; i < enemies.length; i++) {
context.fillStyle = enemies[i].color;
context.fillRect(enemies[i].x, enemies[i].y, enemies[i].width, enemies[i].height);
}
// Draw score
context.fillStyle = "#000";
context.font = "20px Arial";
context.fillText("Score: " + score, 10, 25);
}
// Game loop
function loop() {
update();
render();
requestAnimationFrame(loop);
}
// Game over
function gameOver() {
alert("Game Over! Your score was " + score);
score = 0;
enemies = [];
player.y = canvas.height / 2 - PLAYER_HEIGHT / 2;
}
// Check if two objects collide
function collide(obj1, obj2) {
return obj1.x < obj2.x + obj2.width &&
obj1.x + obj1.width > obj2.x &&
obj1.y < obj2.y + obj2.height &&
obj1.y + obj1.height > obj2.y;
}
// Track pressed keys
let keys = {};
document.addEventListener("keydown", function (event) {
keys[event.keyCode] = true;
});
document.addEventListener("keyup", function (event) {
delete keys[event.keyCode];
});
// Start the game loop
loop();
</script>
</body>
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