bartosz-grabowski.github.io/index.html at main · bartosz-grabowski/bartosz-grabowski.github.io · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Circles</title>
    <style>
      html, body {
        margin: 0;
        padding: 0;
        height: 100%;
      }
      #container {
        position: relative;
        width: 100%;
        height: 100%;
      }
      #canvas {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
      }
      #credit {
        position: absolute;
        bottom: 0;
        right: 0;
        margin: 10px;
        font-size: 12px;
        color: gray;
      }
    </style>
  </head>
  <body>
    <div id="container">
      <canvas id="canvas"></canvas>
      <div id="credit">Created with ChatGPT</div>
    </div>

    <script>
      // Set up canvas
      const canvas = document.getElementById("canvas");
      canvas.width = window.innerWidth;
      canvas.height = window.innerHeight;
      const ctx = canvas.getContext("2d");

      // Create initial circle
      let circles = [];
      createCircle();

      // Add event listener for clicks on canvas
      canvas.addEventListener("click", function(event) {
        for (let i = 0; i < circles.length; i++) {
          const circle = circles[i];
          const dx = event.clientX - circle.x;
          const dy = event.clientY - circle.y;
          const distance = Math.sqrt(dx * dx + dy * dy);
          if (distance <= circle.radius) {
            createCircle();
            break;
          }
        }
      });

      // Function to create a new circle
      function createCircle() {
        const radius = 20 + Math.random() * 30;
        const x = radius + Math.random() * (canvas.width - 2 * radius);
        const y = radius + Math.random() * (canvas.height - 2 * radius);
        const dx = Math.random() * 10 - 5;
        const dy = Math.random() * 10 - 5;
        const color = getRandomColor();
        const circle = {x: x, y: y, radius: radius, dx: dx, dy: dy, color: color};
        circles.push(circle);
      }

      // Function to get a random color
      function getRandomColor() {
        const letters = "0123456789ABCDEF";
        let color = "#";
        for (let i = 0; i < 6; i++) {
          color += letters[Math.floor(Math.random() * 16)];
        }
        return color;
      }

      // Function to update and draw circles
      function drawCircles() {
        ctx.clearRect(0, 0, canvas.width, canvas.height);
        for (let i = 0; i < circles.length; i++) {
          const circle = circles[i];
          circle.x += circle.dx;
          circle.y += circle.dy;
          if (circle.x - circle.radius < 0 || circle.x + circle.radius > canvas.width) {
            circle.dx = -circle.dx;
          }
          if (circle.y - circle.radius < 0 || circle.y + circle.radius > canvas.height) {
            circle.dy = -circle.dy;
          }
          ctx.beginPath();
          ctx.arc(circle.x, circle.y, circle.radius, 0, 2 * Math.PI);
          ctx.fillStyle = circle.color;
          ctx.fill();
        }
      }

      // Set up game loop
      setInterval(function() {
        drawCircles();
      }, 20);
    </script>
  </body>
</html>