Almost there

sources/scripts/init.js

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+// width,height,grid_x,grid_y,block_x,block_y,thickness,linecap, color
+dotgrid = new Dotgrid(300,300,31,31,5,5, 10,"square","#000000");
+dotgrid.install();
+
+var keyboard = new Keyboard();
+document.onkeyup = function myFunction(){ keyboard.listen(event); };
+
+document.addEventListener('mousedown', function(e){ dotgrid.mouse_down(e); }, false);
+document.addEventListener('mousemove', function(e){ dotgrid.mouse_move(e); }, false);
+document.addEventListener('mouseup', function(e){ dotgrid.mouse_up(e);}, false);