HTML5 Canvas Text Along Arc Path

Code Editor

<!DOCTYPE HTML>
<html>
  <head>
    <style>
      body {
        margin: 0px;
        padding: 0px;
      }
    </style>
  </head>
  <body>
    <canvas id="myCanvas" width="578" height="250"></canvas>
    <script>
      function drawTextAlongArc(context, str, centerX, centerY, radius, angle) {
        var len = str.length, s;
        context.save();
        context.translate(centerX, centerY);
        context.rotate(-1 * angle / 2);
        context.rotate(-1 * (angle / len) / 2);
        for(var n = 0; n < len; n++) {
          context.rotate(angle / len);
          context.save();
          context.translate(0, -1 * radius);
          s = str[n];
          context.fillText(s, 0, 0);
          context.restore();
        }
        context.restore();
      }
      var canvas = document.getElementById('myCanvas'), 
        context = canvas.getContext('2d'),
        centerX = canvas.width / 2,
        centerY = canvas.height - 30,
        angle = Math.PI * 0.8,
        radius = 150;
      
      context.font = '30pt Calibri';
      context.textAlign = 'center';
      context.fillStyle = 'blue';
      context.strokeStyle = 'blue';
      context.lineWidth = 4;
      drawTextAlongArc(context, 'Text along arc path', centerX, centerY, radius, angle);

// draw circle underneath text
      context.arc(centerX, centerY, radius - 10, 0, 2 * Math.PI, false);
      context.stroke();
    </script>
  </body>
</html>

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Modified on January 8th, 2013 by Eric Rowell