I'm trying to draw in html5 with canvas, I need to draw a grid. I pass two parameters X and Y.

This example does arme manually: http://jsbin.com/ifohor/4/edit

The idea is to make it dynamic: http://jsbin.com/ifohor/3/edit

But I do not quite know how to calculate Movex, moveY, Linex, Liney and increaseLine.

Any help would be appreciated.