chasing_square.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Canvas Pattern</title>
    <style>
        body {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
            background-color: #fff;
        }
        canvas {
            border: 1px solid black;
        }
    </style>
</head>
<body>
    <canvas id="patternCanvas" width="500" height="500"></canvas>
    <script>
        const canvas = document.getElementById('patternCanvas');
        const ctx = canvas.getContext('2d');

        function drawPattern() {
            const radius = 100;
            const spacing = 10;
            const rows = 5;
            const cols = 5;

            for (let row = 0; row < rows; row++) {
                for (let col = 0; col < cols; col++) {
                    const x = col * 2 * radius * 0.5 + radius;
                    const y = row * 2 * radius * 0.5 + radius;
                    drawArcSet(x, y, radius, spacing);
                }
            }
        }

        function drawArcSet(x, y, radius, spacing) {
            for (let i = 0; i < radius / spacing; i++) {
                ctx.beginPath();
                ctx.arc(x, y, radius - i * spacing, 0, Math.PI, false);
                ctx.stroke();
            }
        }

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