rotate/example.html at master · component/rotate · GitHub

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<html>
<head>
  <title>Rotate</title>
</head>
<body>

  <script src="build/build.js"></script>

  <p><input type="range" min=0 max=360 value=0></p>
  <canvas width=300 height=300></canvas>

  <script>
    var rotate = require('rotate');

    var input = document.querySelector('input');
    var canvas = document.querySelector('canvas');
    var ctx = canvas.getContext('2d');

    function draw(deg) {
      canvas.width = canvas.width;
      ctx.strokeRect(0, 0, 300, 300);
      ctx.save();

      ctx.translate(25, 25);
      rotate(ctx, { degrees: deg, x: 25, y: 25 });
      ctx.fillRect(0, 0, 50, 50);
      ctx.fillStyle = 'red';

      ctx.restore();
      ctx.strokeRect(50, 50, 50, 50);
    }

    draw(0);

    input.onchange = function(e){
      draw(input.value);
    };
  </script>
</body>
</html>