purescript-free-turtle/html/index.html at master · epost/purescript-free-turtle · GitHub

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<!DOCTYPE html>
<html>
<head>
    <meta charset=utf-8 />
    <title>PureScript Free Turtle</title>
    <style type="text/css">
     body {
       background: #eee;
     }
     canvas {
       background: #fff;
     }
    </style>
</head>
<body>
    <canvas id="turtleCanvas">
    </canvas>

    <script type="text/javascript">
        var canvas = document.getElementById('turtleCanvas'),
            context = canvas.getContext('2d');

        // set canvas dimensions through js; doing it by css only will stretch the drawing
        canvas.setAttribute('width',  window.innerWidth);
        canvas.setAttribute('height', 400);

        // put origin at center
        context.translate(canvas.width/2, canvas.height/2);
    </script>
    <script src="index.js"></script>
</body>
</html>