class Board:
"""The game board. This class maintains a Grid for the pieces on the
board and a Grid for the frozen blocks on the board."""
def __init__(self, parent_node, ncolumns, nrows, pos, scale):
self.parent_node = parent_node
self.piece_grid = None # set_size will set these
self.frozen_grid = None
self.set_size(ncolumns, nrows, pos, scale)
def set_size(self, ncolumns, nrows, pos, scale):
self.ncolumns = ncolumns
self.nrows = nrows
self.pos = pos
self.scale = float(scale)
self.size = Point2D(ncolumns, nrows)*self.scale
self.block_size = Point2D(self.scale, self.scale)
if self.piece_grid:
row_offset = nrows - self.piece_grid.nrows
self.piece_grid.grow(ncolumns, nrows)
self.frozen_grid.grow(ncolumns, nrows)
pieces = set(value for cr, value in self.piece_grid.get_blocks())
for piece in pieces:
c, r = piece.cr
piece.cr = (c, r + row_offset)
piece.update_blocks()
piece.update_manip()
for cr, value in self.frozen_grid.get_blocks():
value.pos = self.get_nw_point(cr)
value.size = self.block_size
else:
self.piece_grid = Grid(ncolumns, nrows) # contains Piece references
self.frozen_grid = Grid(ncolumns, nrows) # contains Node references
def destroy(self):
for cr, value in self.frozen_grid.get_blocks():
value.unlink()
def get_nw_point(self, (c, r)):
return self.pos + Point2D(c, r)*self.scale
class Game:
"""The main game controller. This class holds the Board and the list of
Pieces, and causes the Pieces to fall with each clock tick. When the fall
of a Piece is stopped by blocks below, the Piece "freezes": the blocks of
the Piece are copied onto the board and the Piece object is destroyed.
Pieces appear in a "starting zone" at the top where they cannot be
manipulated; if a piece freezes in the starting zone, the game ends."""
def __init__(self, parent_node, app, scale, section_pattern,
tick_interval, ticks_per_drop, pieces_per_drop, shapes):
self.width, self.height = parent_node.size.x, parent_node.size.y
self.app = app
self.node = create_node(parent_node, 'div')
self.section_node = create_node(self.node, 'div', sensitive=False)
# Create a dummy game board; it will be resized in self.set_scale().
self.board = Board(self.node, 1, 1, Point2D(0, 0), scale)
self.board_rect = create_node(self.node, 'rect',
color='a0a0a0', strokewidth=4, sensitive=False)
self.dissolving = None
self.starting_zone = None
self.starting_zone_node = create_node(parent_node, 'rect',
opacity=0, fillcolor='ff0000', fillopacity=0.2)
self.can_add_pieces = True # For debouncing taps on the starting zone.
# Normally, the starting zone can be touched to request more pieces;
# however, this feature is disabled because of an exhaust hose in the
# c-base multitouch table that causes extraneous touches along the top.
# set_handler(self.starting_zone_node, avg.CURSORDOWN, self.handle_down)
self.pieces = []
self.interval_id = None
self.ticks_to_next_drop = 1
self.section_nodes = None
self.set_difficulty(scale, section_pattern, tick_interval,
ticks_per_drop, pieces_per_drop, shapes)
def set_difficulty(self, scale, section_pattern, tick_interval,
ticks_per_drop, pieces_per_drop, shapes):
self.set_scale(scale)
self.set_section_pattern(section_pattern)
self.tick_interval = tick_interval
self.ticks_per_drop = ticks_per_drop
self.pieces_per_drop = pieces_per_drop
self.shapes = shapes
def set_scale(self, scale):
# Resize the game board.
ncolumns, nrows = int(self.width/scale), int(self.height/scale)
board_width = ncolumns*scale
self.board.set_size(ncolumns, nrows,
Point2D((self.width - board_width)/2, self.height % scale), scale)
self.board_rect.pos = self.board.pos
self.board_rect.size = self.board.size
if self.dissolving:
self.dissolving.grow(self.board.ncolumns, self.board.nrows)
else:
self.dissolving = Grid(self.board.ncolumns, self.board.nrows)
# Set up the starting zone.
self.starting_zone = Grid(self.board.ncolumns, STARTING_ZONE_NROWS,
['X'*self.board.ncolumns]*STARTING_ZONE_NROWS)
self.starting_zone_node.pos = self.board.pos
self.starting_zone_node.size = \
Point2D(self.board.ncolumns, STARTING_ZONE_NROWS)*scale
def handle_down(self, event):
if self.can_add_pieces:
self.starting_zone_node.fillopacity = 0.4
self.add_piece(self.board.get_cr(event.pos)[0])
self.can_add_pieces = False # Ignore extraneous double-taps.
set_timeout(300, self.reset_starting_zone)
def reset_starting_zone(self):
self.starting_zone_node.fillopacity = 0.2
self.can_add_pieces = True
def set_section_pattern(self, section_pattern):
if self.section_nodes:
for node in self.section_nodes:
node.unlink()
self.section_nodes = []
self.sections = []
s = 0
for r in reversed(range(STARTING_ZONE_NROWS, self.board.nrows)):
nsections = section_pattern[s]
s = (s + 1) % len(section_pattern)
# If the resolution is too low, 4 sections are no fun.
if self.width < 1200 and nsections > 3:
nsections = 3
section_min = 0
for i in range(nsections):
section_max = int(self.board.ncolumns*float(i + 1)/nsections)
section_ncolumns = section_max - section_min
section = Grid(self.board.ncolumns, self.board.nrows)
for j in range(section_min, section_max):
section.put((j, r), 'X')
self.sections.append(section)
self.section_nodes.append(create_node(self.section_node, 'rect',
pos=self.board.get_nw_point((section_min, r)),
size=Point2D(section_ncolumns, 1)*self.board.scale,
opacity=0.2,
color='ffffff',
sensitive=False))
section_min = section_max
def destroy(self):
self.pause()
for piece in self.pieces:
piece.destroy()
for node in self.section_nodes:
node.unlink()
self.board.destroy()
self.node.unlink()
self.board_rect.unlink()
self.section_node.unlink()
self.starting_zone_node.unlink()
def run(self):
self.pause()
self.interval_id = set_interval(self.tick_interval, self.tick)
def pause(self):
if self.interval_id:
clear_interval(self.interval_id)
self.interval_id = None
def tick(self):
"""Advance the game by one step."""
self.fall_and_freeze()
self.delete_dissolving()
self.mark_dissolving()
if (not list(self.dissolving.get_blocks()) and
self.board.frozen_grid.overlaps_any(self.starting_zone, (0, 0))):
self.app.end_game()
return
self.ticks_to_next_drop -= 1
if (self.ticks_to_next_drop <= 0 or
not list(self.board.piece_grid.get_blocks())):
self.ticks_to_next_drop = self.ticks_per_drop
for p in range(self.pieces_per_drop):
if not self.add_piece():
print 'end_game: add_piece failed'
self.app.end_game()
return
self.app.tick()
def fall_and_freeze(self):
"""Classify all pieces as suspended (by a player grab), stopped (by
frozen blocks), or falling; move falling pieces down by one step and
freeze all stopped pieces."""
# 1. Determine what supports each piece. Pieces can be supported by
# other pieces, by frozen blocks, or by the bottom edge of the board.
supported_pieces = dict((piece, set()) for piece in self.pieces)
stopped = set()
for piece in self.pieces:
for cr, value in piece.get_blocks():
cr_below = add_cr(cr, (0, 1))
if not self.board.piece_grid.in_bounds(cr_below):
stopped.add(piece) # at bottom edge
else:
piece_below = self.board.piece_grid.get(cr_below)
frozen_below = self.board.frozen_grid.get(cr_below)
if piece_below: # supported by a Piece
supported_pieces[piece_below].add(piece)
elif frozen_below: # supported by a frozen block
stopped.add(piece)
# 2. Stop pieces supported by the board, and pieces they support.
stopped = transitive_closure(stopped, supported_pieces)
# 3. Suspend pieces that are grabbed, and pieces they support.
suspended = set(piece for piece in self.pieces if piece.is_grabbed())
suspended = transitive_closure(suspended, supported_pieces)
# 4. Freeze all stopped pieces.
for piece in stopped:
if piece not in suspended:
self.board.freeze_piece(piece)
self.pieces.remove(piece)
# 5. Move down all falling pieces.
for piece in self.pieces:
if piece not in suspended:
piece.move_to(add_cr(piece.cr, (0, 1)))
def delete_dissolving(self):
"""Delete any frozen blocks that are dissolving."""
self.board.delete_frozen(self.dissolving)
self.dissolving.clear()
def mark_dissolving(self):
"""Mark dissolving blocks (to be deleted on the next tick)."""
for section in self.sections:
if self.board.frozen_grid.overlaps_all(section, (0, 0)):
self.dissolving.put_all(section, (0, 0))
self.board.highlight_dissolving(self.dissolving)
def add_piece(self, c=None):
"""Place a new Piece with a randomly selected shape at a random
rotation and position somewhere along the top of the game board."""
columns = (c is None) and range(self.board.ncolumns) or [c]
# Permute the shapes, rotations, and possible positions, so that we
# get a random result, but eventually try them all.
for shape in shuffled(self.shapes):
for rotation in shuffled(range(4)):
for c in shuffled(columns):
grid = shape.get_rotated(rotation)
min_r = min(r for (c, r), value in grid.get_blocks())
cr = (c - grid.ncolumns/2, -min_r)
if self.board.can_put_piece(None, cr, grid):
self.pieces.append(
Piece(self.node, self.board, cr, grid))
return True
return False # couldn't find anywhere to put a new piece