Drawing an X shape on a HTML5 canvas and checking for collisions with a border

Question

I am working on a maze game in HTML 5.

Here is the function which I use to draw an \"X\" on the canvas (using the touchpad, the user will navigate the X through the laby

Answer 1

Wow, writing the question made it clear:

var imgd = ctx.getImageData(checkx - xdim, checky - xdim, 16, 16);

Ty guys