Canvas-2D-Context-API-Primer/strokeRect.html at master · rroa/Canvas-2D-Context-API-Primer · GitHub

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<!DOCTYPE html>
<html>
    <head>
      <title>Canvas 2D Context API Primer</title>
      <meta charset="utf-8" />
      <meta name="viewport" content="width=1024" />
      <meta name="apple-mobile-web-app-capable" content="yes" />

       <!--SCRIPTS-->
      <script type="text/javascript">
        /*
          # Context 2d API: strokeRect
          Creates an outline of the specified rectangle on a canvas by using the current stroke, line width, and join styles.

          # Standard Definition.
          http://www.w3.org/html/wg/drafts/2dcontext/html5_canvas/#dom-context-2d-strokerect

          # Function signature
          void strokeRect(unrestricted double x, unrestricted double y, unrestricted double w, unrestricted double h);

        */

        function draw(){
          // Get a reference to the canvas
          var canvas = document.getElementById('canvas');

          // Get a reference to the drawing context
          var ctx = canvas.getContext('2d');

          // Blue rectangle outline
          ctx.lineWidth = "3";
          ctx.strokeStyle = "blue";
          ctx.strokeRect(5, 5, 300, 250);

          // Red rectangle outline
          ctx.lineWidth = "5";
          ctx.strokeStyle = "red";
          ctx.strokeRect(150, 200, 300, 150);

          // Green rectangle outline with round corners
          ctx.lineJoin = "round";
          ctx.lineWidth = "10";
          ctx.lineWidth = "7";
          ctx.strokeStyle = "green";
          ctx.strokeRect(250, 50, 150, 250);
        }
      </script>
  </head>
  <body onload="draw();">
    <p>
      <a href="index.html">Back to index</a>
    </p>
    <canvas id="canvas" width="600" height="500">
      This browser or document mode doesn't support canvas
    </canvas>
  </body>
</html>