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- <!DOCTYPE html>
- <html lang="en">
- <head>
- <meta charset="UTF-8">
- <title>Document</title>
- <script type="text/javascript">
- document.addEventListener("DOMContentLoaded", function(){
- let canvas = document.getElementById('canvasId');
- let canvasId = canvas.getContext("2d");
- let x = 400, y = 50, r = 20;
- for (let j = 0; j < 4; j++) {
- for (let i = 1; i <= 5; i++) {
- canvasId.beginPath();
- canvasId.fillStyle = 'white';
- canvasId.arc(x + i*50, y + i*50, r, 0, Math.PI*2);
- canvasId.fill();
- canvasId.closePath();
- }
- console.log(x + " " + y);
- canvasId.translate(400, 300);
- canvasId.rotate(90 * Math.PI / 180);
- canvasId.translate(-400, -300);
- }
- canvasId.beginPath();
- canvasId.fillStyle = 'red';
- canvasId.arc(x, y, r, 0, Math.PI*2);
- canvasId.fill();
- canvasId.closePath();
- });
- </script>
- <style>
- canvas{
- background-color: black;
- }
- </style>
- </head>
- <body>
- <canvas width="800" height="800" id="canvasId"></canvas>
- </body>
- </html>
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