def checkBordersSnap(myCanvas, mouseLoc, tilesToSnap, checkedTiles, grid,
gridRes, isDragging, isSnapped, sidesToSnap, snapdTile, selectedTiles):
isConflict = False
for tileA in tilesToSnap:
if tileA.isFree():
areasToCheck = misc.getAreasToCheck(tileA.position, grid, gridRes)
for sideA in tileA.sides:
if not sideA.isSnapped:
for area in areasToCheck:
for tileB in area:
if tileA is not tileB:
sideB = tileB.getSide(sideA.adjType)
isSnapped, sidesToSnap, snapdTile, \
isConflict = checkBorderSnap(mouseLoc,
sideA, sideB, checkedTiles, isDragging,
isSnapped, sidesToSnap, snapdTile,
isConflict, selectedTiles)
return isSnapped, sidesToSnap, snapdTile, isConflict
def moveSnappable(myCanvas, mouseLoc, checkedTiles, selectedTiles,
selectedTile, palletBack, isSnapped, sidesToSnap, snapdTile, snapdSide,
adjSide, grid, gridRes):
# minDistance will end up storing the distance to the nearest tile/
# tile group
minDistance = objects.Canvas.SNAP_DISTANCE * objects.Canvas.scale
# isMatch keeps track of whether or not there are two tiles who's
# facing sides match, and which are close enough together to
# potentially snap
isMatch = False
# This next block basically looks at all the moving tiles, and
# determines whether or not any of them are close enough, and the
# right kind of side, to potentially snap together, and if so,
# sets those to sides to snapdSide and adjSide
for tileA in selectedTile.tileGroup:
# This block only runs if there are sides to the tile which are
# not already snapped to other tiles
if tileA.isFree():
# This gets areas near each tile to reduce the number of
# tiles which need to be checked for potential snapping
areasToCheck = misc.getAreasToCheck(tileA.position, grid, gridRes)
for sideA in tileA.sides:
if not sideA.isSnapped:
for area in areasToCheck:
for tileB in area:
# If a side of a moving tile is not snapped,
# and a nearby tile has unsnapped sides,
# and the nearby tile has not already been
# found to be unsnappable (not in
# checkedTiles) then this block evaluates
if tileB.isFree() and tileB not in checkedTiles:
# This sets sideB to the side of the
# nearby tile adjacent to the moving
# tile
sideB = tileB.getSide(sideA.adjType)
# This determines if the two sides
# could potentially snap, and if so
# sets snapdSide and adjSide to these
# two sides, and sets isMatch to True.
# In the end it only applies to a
# nearest snappable tile.
minDist, isMatch, snapdSide, adjSide = \
misc.findMatch(sideA, sideB,
minDistance, isMatch, snapdSide,
adjSide)
if isMatch:
checkedTiles.append(adjSide.tile)
# If two matching sides were found above in this function, then
# the below function shifts the moving tiles into a snapped
# position with the nearby tiles
isSnapped, snapdTile, snapdSide = misc.snapTiles(selectedTile,
snapdSide, adjSide)
# If, by shifting towards other tiles to snap, a tile group
# would overlap with the tile pallet, the tile group is then
# moved back to where it would have been before shifting, and
# isConflict is set to true. This is to prevent tiles from
# snapping to other tiles when they would also be moving into
# a position over the tile pallet which usually means the tiles
# would be set to be deleted
if selectedTile.getRect().colliderect(palletBack):
isSnapped, sidesToSnap, snapdTile, isConflict = \
misc.unSnapAll(sidesToSnap)
# All that is known at this point is that two tiles match and
# could potentially snap. Below, the code checks whether or not
# shifting tiles to a snapped position would cause OTHER tiles
# to not match with each other, in which case these tiles are
# moved back to where they were before they were snapped. Any
# tiles which were found to not be able to snap are added to
# checkedTiles. This moveSnappable function is then called
# recursively to check for possible matches which are not the
# NEAREST potential matches, until all nearby tiles have been
# checked for possible snapping. If all the sides match, the
# sides are set up to be snapped whenever the user unclicks.
else:
isSnapped, sidesToSnap, snapdTile, isConflict = \
checkers.checkBordersSnap(myCanvas, mouseLoc,
selectedTiles, checkedTiles, grid, gridRes, True,
isSnapped, sidesToSnap, snapdTile, selectedTiles)
if isConflict:
isSnapped, sidesToSnap, snapdTile, snapdSide, adjSide = \
moveSnappable(myCanvas, mouseLoc, checkedTiles,
selectedTiles, selectedTile, palletBack, isSnapped,
sidesToSnap, snapdTile, snapdSide, adjSide, grid, gridRes)
# If there were no sets of tiles nearby in which all sides matched,
# the dragged tiles simply move to where they are dragged
else:
noSnapMove(mouseLoc, selectedTiles)
return isSnapped, sidesToSnap, snapdTile, snapdSide, adjSide
