docs: function(type, pos, width, height, canvas){
        var ctx = canvas.getCtx();
        height /= 2;
        width /= 2;
        ctx.save();
        ctx.scale(width / height, height / width);
        ctx.beginPath();
        ctx.arc(pos.x * (height / width), pos.y * (width / height), height, 0,
            Math.PI * 2, true);
        ctx.closePath();
        ctx[type]();
        ctx.restore();
      }