BACKTRACK is false
FINDLOOP is false
BOTTLENECK is false

CUR is the current pixel
MARK is the first mark, and is not set
MARK2 is the second mark, and is not set


Start by turning to face the next direction
main loop:
	if CUR is bound by 4 edge pixels
		paint CUR
		all possible pixels have been filled, so exit the routine

	if CUR is bound by 3 edge pixels
		paint CUR
		move forward
		turn to next direction
		continue main loop

	if CUR is bound by 2 edge pixels
		if the two bounding edge pixels are not across from each other, and the corner opposite both edge pixels is not filled
			paint CUR
			move forward
			turn to next direction
			continue main loop
		else
			if BACKTRACK is false and  MARK is not set
				set MARK to CUR's location and direction
				set FINDLOOP to false
			else, if MARK is set
				if MARK2 is not set
					if CUR is at MARK's location
						if CUR's direction is the same as MARK's
							remove MARK
							set BACKTRACK to false
						else
							set BACKTRACK to true
							set CUR to MARK's direction
							set FINDLOOP to false
					else, if FINDLOOP is true
						set MARK2 to CUR's location and direction
				else
					if CUR is at MARK's location
						set CUR to MARK2's direction and location
						remove MARK
						remove MARK2
						set BACKTRACK to false
					else if CUR is at MARK2's location
						set MARK to MARK2's direction and location
						set CUR's direction to MARK2's direction
						remove MARK2
			if BACKTRACK is false and MARK is not set
				if BOTTLENECK is false
					paint CUR
				set BOTTLENECK to false
			move according to boundaries
			continue main loop

	if CUR is bound by 1 edge pixel
		if BACKTRACK is true and FINDLOOP is false
			set FINDLOOP to true
		else, if neither  of the corners opposite the bounding pixel are filled
			paint CUR
			move forward
			turn to next direction
			continue main loop
		move according to boundaries
		continue main loop

	if CUR is bound by 0 edge pixels
		if BACKTRACK is true and FINDLOOP is false
			set FINDLOOP to true
		set BOTTLENECK to false
		move any direction (use a default direction, not a random one)
		continue main loop


##############################
how to move according to boundaries: (NOTE: "right" and "left" are always relative to the current direction)
	if CUR is filled or the forward-right corner is filled
		move CUR one step forward
		turn to next direction
	else
		if MARK is at the pixel one step forward
*			set CUR to MARK's direction and location
*			set remove MARK and MARK2
*			set BACKTRACK to false
*			set FINDLOOP to false
*			get the new boundaries and restart the move routine from the beginning
		else, if MARK2 is at the pixel one step forward
			set MARK to MARK2's direction and location
			set CUR's direction to MARK2's direction
			remove MARK2
		if BACKTRACK is true and FINDLOOP is false
			if either the pixel two steps forward is filled or the forward-left side pixel is filled
				set FINDLOOP to true
		move CUR one step forward
		move CUR one step to the right
		turn to next direction



##############################
How to turn to the next direction:
	if no boundaries are filled, just face in the default direction and stop turning
	while the pixel to the right is not filled
		rotate to the right
	while the pixel to the front is filled
		rotate to the left



##############################
every time you paint:
	remove MARK, if set
	remove MARK2, if set
	set FINDLOOP to false
	set BOTTLENECK to false
	set RULE to "right"