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No:45018

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Shooting Game
Developer User19546｜Date and time 24/2/20 0:06:06
Build time 10.903 sec｜Game capacity 2.484KB｜

Script

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Click here for free DL of the app version that can save data.

<!DOCTYPE html>
<html>
<head>
    <title>射击游戏</title>
</head>
<body>
    <canvas id="gameCanvas" width="500" height="500"></canvas>
    
    <script>
        const canvas = document.getElementById("gameCanvas");
        const ctx = canvas.getContext("2d");
        
        let playerX = canvas.width/2;
        let playerY = canvas.height - 50;
        let playerWidth = 20;
        let playerHeight = 20;
        
        let bulletX = canvas.width/2;
        let bulletY = canvas.height - 50;
        let bulletWidth = 5;
        let bulletHeight = 10;
        
        let upPressed = false;
        let rightPressed = false;
        let leftPressed = false;
        
        document.addEventListener("keydown", keyDownHandler);
        document.addEventListener("keyup", keyUpHandler);
        
        function keyDownHandler(event) {
            if(event.key === "ArrowUp") {
                upPressed = true;
            }
            if(event.key === "ArrowRight") {
                rightPressed = true;
            }
            if(event.key === "ArrowLeft") {
                leftPressed = true;
            }
        }
        
        function keyUpHandler(event) {
            if(event.key === "ArrowUp") {
                upPressed = false;
            }
            if(event.key === "ArrowRight") {
                rightPressed = false;
            }
            if(event.key === "ArrowLeft") {
                leftPressed = false;
            }
        }
        
        function drawPlayer() {
            ctx.beginPath();
            ctx.rect(playerX, playerY, playerWidth, playerHeight);
            ctx.fillStyle = "blue";
            ctx.fill();
            ctx.closePath();
        }
        
        function drawBullet() {
            ctx.beginPath();
            ctx.rect(bulletX, bulletY, bulletWidth, bulletHeight);
            ctx.fillStyle = "red";
            ctx.fill();
            ctx.closePath();
        }
        
        function draw() {
            ctx.clearRect(0, 0, canvas.width, canvas.height);
            drawPlayer();
            drawBullet();
            
            if(upPressed && bulletY > 0) {
                bulletY -= 2;
            }
            if(rightPressed && playerX < canvas.width - playerWidth) {
                playerX += 2;
            }
            if(leftPressed && playerX > 0) {
                playerX -= 2;
            }
        }
        
        setInterval(draw, 10);
    </script>
</body>
</html>