for all who use canvas i need help..

i want to draw on a bullet surface what i mean

am doing a auto-runing game but i want to replace the blocks with the drawing canvas then it automatically should go to the left side of the screen but when i draw a line it Separates and go into pieces..

any idea

capx

dl.dropboxusercontent.com/u/62993408/running%20n%20drawing%20bug.capx