lsystem/logo.html at master · vasuman/lsystem · GitHub

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<html>
    <head>
        <title> Logo demo </title>
        <script src="logo.js"></script>
    </head>
    <body>
        <div id="iconsole">
            <div id="prev"></div>
            <input id="prompt"/>
            <button id="evaluate">Evaluate</button>
        </div>
        <canvas id="main-canvas"></canvas>
        <script>
            function $(id) {
                return document.getElementById(id);
            }
            var can = $('main-canvas'),
                ctx = can.getContext('2d');
            can.width = 800;
            can.height = 600;
            var turtle = new Turtle(drawCback(ctx, new Bounds(800, 600)));
            turtle.state.x = 400;
            turtle.state.y = 300;
            $('prompt').onkeypress = function(e) {
                if(e.keyCode === 13) {
                    $('evaluate').click();
                }
            };
            $('evaluate').onclick = function() {
                var txt = $('prompt').value,
                    cmd = parseLogoCmd(txt);
                turtle.apply(cmd);
                $('prev').innerHTML += '<br/>' + txt;
                $('prompt').value = '';
            };
        </script>
    </body>
</html>