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Diffstat (limited to 'Tools/demo/hanoi.py')
-rwxr-xr-x | Tools/demo/hanoi.py | 154 |
1 files changed, 0 insertions, 154 deletions
diff --git a/Tools/demo/hanoi.py b/Tools/demo/hanoi.py deleted file mode 100755 index 8db895c..0000000 --- a/Tools/demo/hanoi.py +++ /dev/null @@ -1,154 +0,0 @@ -#!/usr/bin/env python3 - -""" -Animated Towers of Hanoi using Tk with optional bitmap file in background. - -Usage: hanoi.py [n [bitmapfile]] - -n is the number of pieces to animate; default is 4, maximum 15. - -The bitmap file can be any X11 bitmap file (look in /usr/include/X11/bitmaps for -samples); it is displayed as the background of the animation. Default is no -bitmap. -""" - -from tkinter import Tk, Canvas - -# Basic Towers-of-Hanoi algorithm: move n pieces from a to b, using c -# as temporary. For each move, call report() -def hanoi(n, a, b, c, report): - if n <= 0: return - hanoi(n-1, a, c, b, report) - report(n, a, b) - hanoi(n-1, c, b, a, report) - - -# The graphical interface -class Tkhanoi: - - # Create our objects - def __init__(self, n, bitmap=None): - self.n = n - self.tk = tk = Tk() - self.canvas = c = Canvas(tk) - c.pack() - width, height = tk.getint(c['width']), tk.getint(c['height']) - - # Add background bitmap - if bitmap: - self.bitmap = c.create_bitmap(width//2, height//2, - bitmap=bitmap, - foreground='blue') - - # Generate pegs - pegwidth = 10 - pegheight = height//2 - pegdist = width//3 - x1, y1 = (pegdist-pegwidth)//2, height*1//3 - x2, y2 = x1+pegwidth, y1+pegheight - self.pegs = [] - p = c.create_rectangle(x1, y1, x2, y2, fill='black') - self.pegs.append(p) - x1, x2 = x1+pegdist, x2+pegdist - p = c.create_rectangle(x1, y1, x2, y2, fill='black') - self.pegs.append(p) - x1, x2 = x1+pegdist, x2+pegdist - p = c.create_rectangle(x1, y1, x2, y2, fill='black') - self.pegs.append(p) - self.tk.update() - - # Generate pieces - pieceheight = pegheight//16 - maxpiecewidth = pegdist*2//3 - minpiecewidth = 2*pegwidth - self.pegstate = [[], [], []] - self.pieces = {} - x1, y1 = (pegdist-maxpiecewidth)//2, y2-pieceheight-2 - x2, y2 = x1+maxpiecewidth, y1+pieceheight - dx = (maxpiecewidth-minpiecewidth) // (2*max(1, n-1)) - for i in range(n, 0, -1): - p = c.create_rectangle(x1, y1, x2, y2, fill='red') - self.pieces[i] = p - self.pegstate[0].append(i) - x1, x2 = x1 + dx, x2-dx - y1, y2 = y1 - pieceheight-2, y2-pieceheight-2 - self.tk.update() - self.tk.after(25) - - # Run -- never returns - def run(self): - while True: - hanoi(self.n, 0, 1, 2, self.report) - hanoi(self.n, 1, 2, 0, self.report) - hanoi(self.n, 2, 0, 1, self.report) - hanoi(self.n, 0, 2, 1, self.report) - hanoi(self.n, 2, 1, 0, self.report) - hanoi(self.n, 1, 0, 2, self.report) - - # Reporting callback for the actual hanoi function - def report(self, i, a, b): - if self.pegstate[a][-1] != i: raise RuntimeError # Assertion - del self.pegstate[a][-1] - p = self.pieces[i] - c = self.canvas - - # Lift the piece above peg a - ax1, ay1, ax2, ay2 = c.bbox(self.pegs[a]) - while True: - x1, y1, x2, y2 = c.bbox(p) - if y2 < ay1: break - c.move(p, 0, -1) - self.tk.update() - - # Move it towards peg b - bx1, by1, bx2, by2 = c.bbox(self.pegs[b]) - newcenter = (bx1+bx2)//2 - while True: - x1, y1, x2, y2 = c.bbox(p) - center = (x1+x2)//2 - if center == newcenter: break - if center > newcenter: c.move(p, -1, 0) - else: c.move(p, 1, 0) - self.tk.update() - - # Move it down on top of the previous piece - pieceheight = y2-y1 - newbottom = by2 - pieceheight*len(self.pegstate[b]) - 2 - while True: - x1, y1, x2, y2 = c.bbox(p) - if y2 >= newbottom: break - c.move(p, 0, 1) - self.tk.update() - - # Update peg state - self.pegstate[b].append(i) - - -def main(): - import sys - - # First argument is number of pegs, default 4 - if sys.argv[1:]: - n = int(sys.argv[1]) - else: - n = 4 - - # Second argument is bitmap file, default none - if sys.argv[2:]: - bitmap = sys.argv[2] - # Reverse meaning of leading '@' compared to Tk - if bitmap[0] == '@': bitmap = bitmap[1:] - else: bitmap = '@' + bitmap - else: - bitmap = None - - # Create the graphical objects... - h = Tkhanoi(n, bitmap) - - # ...and run! - h.run() - - -# Call main when run as script -if __name__ == '__main__': - main() |