CSC111 drawChessBoard.py

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# chess.py
# D. Thiebaut
# Draws a board with 8 queens on it, in such a way
# that none of them can take each other.
# The text exquivalent is shown below.
"""
Q . . . . . . .
. . . . Q . . .
. . . . . . . Q
. . . . . Q . .
. . Q . . . . .
. . . . . . Q .
. Q . . . . . .
. . . Q . . . .
"""

from graphics import *

def drawOneRow( win, xOffset, yOffset ):
    """draws a row of squares, alternating with the first one
    being black, then white, etc."""
    for x in range( xOffset, xOffset+ 8*20, 40 ):
        coloredR = Rectangle( Point( x, yOffset ), Point( x+20, yOffset+20) ) 
        coloredR.setFill( "black" )
        coloredR.draw( win )
        
def drawBoard( win ):
    """ draw the whole board of colored squares"""
    #--- draw bigRectangle ---
    topLeft = Point( 20, 20 )
    botRight= Point( 180, 180 )
    bigR = Rectangle( topLeft, botRight )
    bigR.draw( win )

    #--- draw first line ---
    x = 20
    for y in range( 20, 8*20+1, 20 ):
        drawOneRow( win, x, y )
        x = 60 - x

def drawQueens( win, solution ):
    """ Puts the 8 queens on the board, in the right place.
    Solution is a list containing the column location of each
    queens, assuming that the first queen goes on the top row,
    the second queen on the next row, etc."""

    # pick each column one after the other
    for row, col in solution:
        # transform row and col into a y and x position
        x = col * 20 + 20 + 10
        y = row * 20 + 20 + 10
        
        # put a circle at x,y
        center = Point( x, y )
        cir = Circle( center, 8 )
        cir.draw( win )
        cir.setFill( "red" )
        
def main():
    #--- initialize the board ---
    win = GraphWin( "Queens" )
    drawBoard( win )

    #--- the solution, where each number is a column number ---
    #--- we assume that 
    solution = [ [0,0],[1,4],[2,7],[3,5],[4,2],[5,6],[6,1],[7,3] ]
    drawQueens( win, solution )
    
    #--- wait till user clicks mouse to close up ---
    win.getMouse()
    win.close()
    

main()

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