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No:47956

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Billiards
Developer User20677｜Date and time 24/3/1 5:59:56
Build time 10.141 sec｜Game capacity 2.049KB｜

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[PR]現在の欲しいものランキング

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

<!DOCTYPE html>
<html>
<head>
<title>Billar</title>
<style>
canvas {
    border: 1px solid #000;
}
</style>
</head>
<body>
<canvas id="canvas" width="400" height="400"></canvas>

// Functions
function drawBall() {
    ctx.beginPath();
    ctx.arc(ball.x, ball.y, ball.radius, 0, Math.PI*2);
    ctx.fillStyle = "#f00";
    ctx.fill();
    ctx.closePath();
}

function drawCue() {
    ctx.fillStyle = "#000";
    ctx.fillRect(cue.x, cue.y, cue.width, cue.height);
}

function draw() {
    ctx.clearRect(0, 0, canvas.width, canvas.height);

drawBall();
    drawCue();

ball.x += ball.dx;
    ball.y += ball.dy;

if(ball.x + ball.radius > canvas.width || ball.x - ball.radius < 0) {
        ball.dx = -ball.dx;
    }

if(ball.y + ball.radius > canvas.height || ball.y - ball.radius < 0) {
        ball.dy = -ball.dy;
    }

if(isDragging && ball.dx === 0 && ball.dy === 0) {
        let angle = Math.atan2(ball.y - cue.y, ball.x - cue.x);
        let speed = Math.sqrt(Math.pow(ball.x - cue.x, 2) + Math.pow(ball.y - cue.y, 2)) * 0.1;
        ball.dx = Math.cos(angle) * speed;
        ball.dy = Math.sin(angle) * speed;
    }

requestAnimationFrame(draw);
}

function onMouseDown(event) {
    if(event.offsetX >= cue.x && event.offsetX <= cue.x + cue.width &&
       event.offsetY >= cue.y && event.offsetY <= cue.y + cue.height) {
        isDragging = true;
    }
}

function onMouseMove(event) {
    if(isDragging) {
        cue.x = event.offsetX - cue.width/2;
        cue.y = event.offsetY - cue.height/2;
    }
}

function onMouseUp() {
    isDragging = false;
}

canvas.addEventListener("mousedown", onMouseDown);
canvas.addEventListener("mousemove", onMouseMove);
canvas.addEventListener("mouseup", onMouseUp);

draw();
</script>
</body>
</html>