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puzzle.py
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puzzle.py
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"""
8-puzzle and 15-puzzle game is a puzzle game played by moving of tiles
Copyright (C) 2018 Rahul Gautham Putcha
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
For more details on contact please do visit, https://rahulgputcha.com or email to [email protected]
"""
from random import shuffle
#Basic Unit (Block)
class Block() :
def __init__(self,number,i,j,maxBlocks) :
if 0<=number<maxBlocks :
self.number = number
self.pos = (i,j)
self.up = None
self.down = None
self.left = None
self.right = None
self.numBlocks = maxBlocks
self.oldMoves = []
self.calculateOffset()
else :
print("Puzzle Crashed!!")
quit()
def calculateOffset(self) :
if self.number != 0 :
self.dy = abs(((self.number-1)%int((self.numBlocks)**0.5))-self.pos[1])
self.dx = abs(int((self.number-1)//int((self.numBlocks)**0.5))-self.pos[0])
else : self.dx=self.dy=-1
#Puzzle Game Class
class Game() :
def __init__(self,puzzleCode) :
self.numBlocks = puzzleCode+1
self.final_set = [i+1 for i in range(self.numBlocks-1)]
self.final_set.append(0)
self.getSolvable()
self.win = False
self.score = 0
self.reset_game()
# Reset Game - Starting of Game or When 'R' button is Pressed
def reset_game(self) :
if self.win :
self.getSolvable()
self.win = False
self.blocks = {}
for i in range(int((self.numBlocks)**0.5)) :
for j in range(int((self.numBlocks)**0.5)) :
self.blocks[(i,j)] = Block(self.start_set[int(((self.numBlocks)**0.5)*i)+j],i,j,self.numBlocks)
for i in range(int((self.numBlocks)**0.5)) :
for j in range(int((self.numBlocks)**0.5)) :
self.assignAdjacent(i,j)
self.oldMoves = [[self.blocks[(i,j)].number for i in range(int((self.numBlocks)**0.5)) for j in range(int((self.numBlocks)**0.5))]]
self.score = self.calculateScore()
# Exchange Blocks - Used for Swaping '0'_Block and clicked_Block
def swapBlocks(self,block1,block2) :
if not self.win :
block1.number,block2.number = block2.number,block1.number
block1.calculateOffset()
block2.calculateOffset()
if len(self.oldMoves)<=32 :
self.oldMoves.append([self.blocks[(i,j)].number for i in range(int((self.numBlocks)**0.5)) for j in range(int((self.numBlocks)**0.5))])
else :
del self.oldMoves[0]
self.oldMoves.append([self.blocks[(i,j)].number for i in range(int((self.numBlocks)**0.5)) for j in range(int((self.numBlocks)**0.5))])
self.declareWin()
# Assign Adjacent Blocks (up,down,left,right block) of Block[(i,j)]- For Movement Restriction
def assignAdjacent(self,i,j) :
if i==0 :
self.blocks[(i,j)].up,self.blocks[(i,j)].down = None , self.blocks[(i+1,j)]
elif i== int((self.numBlocks**0.5)-1) :
self.blocks[(i,j)].up,self.blocks[(i,j)].down = self.blocks[(i-1,j)] , None
else :
self.blocks[(i,j)].up,self.blocks[(i,j)].down = self.blocks[(i-1,j)] , self.blocks[(i+1,j)]
if j==0 :
self.blocks[(i,j)].left,self.blocks[(i,j)].right = None , self.blocks[(i,j+1)]
elif j== int((self.numBlocks**0.5)-1) :
self.blocks[(i,j)].left,self.blocks[(i,j)].right = self.blocks[(i,j-1)] , None
else :
self.blocks[(i,j)].left,self.blocks[(i,j)].right = self.blocks[(i,j-1)] , self.blocks[(i,j+1)]
#Declare Win - Check if user won the Game
def declareWin(self) :
self.score = self.calculateScore()
if not self.score :
self.win=True
# Calculate Score - lesser the score more chance to win the game
# score = sigma(Block[(i,j)].dx + Block[(i,j)].dy) = Sum of position of all blocks relative to their original position
def calculateScore(self) :
sumd = 0
for i in range(int((self.numBlocks)**0.5)) :
for j in range(int((self.numBlocks)**0.5)) :
if(self.blocks[(i,j)].number!=0) :
sumd += self.blocks[(i,j)].dx+self.blocks[(i,j)].dy;
return sumd;
# Get Solvable - Using Inversion Algorithm
def getSolvable(self) :
self.start_set = [i for i in range(self.numBlocks)]
inversion=0
while True :
inversion = 0
shuffle(self.start_set)
for i in range(0,self.numBlocks-1) :
for j in range(i+1,self.numBlocks) :
if (self.start_set[j] and self.start_set[i] and self.start_set[i]>self.start_set[j]) :
inversion+=1;
if self.numBlocks%2!=0 or self.find0()%2!=0:
if inversion%2==0 : break
def find0(self) :
for i in range(int(self.numBlocks**0.5)-1,-1,-1) :
for j in range(int(self.numBlocks**0.5)-1,-1,-1) :
if self.start_set[i*(int(self.numBlocks**0.5))+j] == 0 :
return int(self.numBlocks**0.5)-i;
# Next Hint - Computer Play or Choice using optimized Branch Bound Algorithm -> returns BestRank obtained
def nextHint(self,lastMove) :
rank = {}
oldScore = self.calculateScore()
bestScore = 999
number = -1
if not self.win :
zeroBlock = None
#Getting ZeroBlock
for i in range(int((self.numBlocks)**0.5)) :
for j in range(int((self.numBlocks)**0.5)) :
if self.blocks[(i,j)].number == 0 :
zeroBlock = self.blocks[(i,j)]
#Getting the Score for winning of each adjacent Block : Less Score More Chances
if zeroBlock is not None :
up,down,left,right = zeroBlock.up,zeroBlock.down,zeroBlock.left,zeroBlock.right
for i in up,down,left,right :
if i is not None and (lastMove is None or lastMove.number!=i.number):
self.swapBlocks(i,zeroBlock)
nextMove = self.oldMoves[len(self.oldMoves)-1]
del self.oldMoves[len(self.oldMoves)-1]
score = self.calculateScore()
if nextMove not in self.oldMoves :
rank[i] = score
self.swapBlocks(i,zeroBlock)
del self.oldMoves[len(self.oldMoves)-1]
#Getting the Best Score and removing all unnecessary ones
if len(rank)>0 :
bestScore = min(rank.values())
rank = {i:value for i,value in list(rank.items()) if value==bestScore}
if len(rank)>1 and bestScore<oldScore: #if there are more than one block,
#only one can fill the empty space,hences choosing most probable one
for i in rank :
self.swapBlocks(i,zeroBlock)
nextMove = self.oldMoves[len(self.oldMoves)-1]
del self.oldMoves[len(self.oldMoves)-1]
if nextMove not in self.oldMoves :
_,rank[i] = self.nextHint(zeroBlock)
else : del self.oldMoves[len(self.oldMoves)-1]
self.swapBlocks(i,zeroBlock)
del self.oldMoves[len(self.oldMoves)-1]
bestScore = min(rank.values())
for i in rank : number,bestScore = i.number,rank[i]
else : #Otherwise, there is only one Block to Move then or most possibly can also be the next best way
for i in rank : number,bestScore = i.number,rank[i]
else : #Otherwise, there is only one Block other than previously moved
try:
number,bestScore = i.number,bestScore
except:
return -1, -1
return number,bestScore
'''
# Rough display of the Block[(i,j)] for Debug purpose
def display(self) :
print("Index\t:\tActual_Pos\t:\tBlock_No\t:\tOffset")
for i in range(int((self.numBlocks)**0.5)) :
for j in range(int((self.numBlocks)**0.5)) :
print(f"{(int((self.numBlocks)**0.5)*i+j)}\t:\t{(i,j)}\t\t:\t{self.blocks[(i,j)].number}\t\t:\t{(self.blocks[(i,j)].dx,self.blocks[(i,j)].dy)}")
'''