gistfile1.py

def characterHitObstacle(character, wallmask):



	newX = character.x
	newY = character.y

	oldX = character.x-character.hspeed
	oldY = character.y-character.vspeed

	hspeed = character.hspeed
	vspeed = character.vspeed


	length = lengthdir(hspeed, vspeed)

	if length == 0:# You haven't moved; if this happens something went wrong

		character.x = oldX
		character.y = oldY
		return False


	# hs and vs is the normalized vector of hspeed and vspeed.
	hs = character.hspeed/length
	vs = character.vspeed/length

	i = 0
	while objectCheckCollision(character, wallmask) and i < length:

		character.x = newX-(hs*i)
		character.y = newY-(vs*i)
		i += 1


	# The character got pushed out, but now we need to let him move in the directions he's allowed to move.

	character.x += sign(character.hspeed)

	if objectCheckCollision(character, wallmask):

		# There's empty space on the left/right

		# Kill all vertical movement
		character.vspeed = 0

		i = 0
		while i <= hspeed:

			character.x = newX+(sign(character.hspeed)*i)

			# If the new position has met a wall too:
			if objectCheckCollision(character, wallmask):
				character.x = newX+(sign(character.hspeed)*(i-1))
				break

	else:
		character.x -= sign(character.hspeed)
		character.y += sign(character.vspeed)

		if objectCheckCollision(character, wallmask):

			# There's empty space on the left/right

			# Kill all vertical movement
			character.hspeed = 0

			i = 0
			while i <= vspeed:

				character.y = newY+(sign(character.vspeed)*i)

				# If the new position has met a wall too:
				if objectCheckCollision(character, wallmask):
					character.y = newY+(sign(character.vspeed)*(i-1))
					break

		character.y -= sign(character.vspeed)
	

#	character.hspeed = 0
#	character.vspeed = 0

	character.hspeed = oldX-character.x
	character.vspeed = oldY-character.y

	return True