On 9/11/2017 12:56 PM, Paul Moore wrote:
I'm not looking at actually implementing chess. The idea was prompted
by a programming exercise my son was given, that was about programming
a series of classes modelling robots that know their position on a
grid, and when told to move, can do so according to certain rules. One
moves in a straight line till it hits the edge, one moves in a random
direction, some bounce when they hit an obstacle and some just stop,
etc. The idea is to demonstrate classes and inheritance to model
common behaviours and objects holding state that the behaviour acts
on.
The original exercise (which used Java) just had the program print out
the objects' co-ordinates at each step. I thought that visualising the
results by actually showing the objects moving would be better. (And a
quick discussion/demo with the guy I'm training showed me I'm right -
his reaction was "wow, that looks really impressive" :-))
Once you have a tkinter board, it is pretty easy to add an animated
'sprite'. The key is understanding root.after loops. This example has
multiple animated warp-around robots, moving at different speeds and
different movement patterns.
------------
import random
import tkinter as tk
def create_board(root):
board = {}
for r in range(8):
for c in range(8):
lbl = tk.Button(bg="white", text=" ", font=("Consolas", 12))
lbl.grid(row=r, column=c)
board[c,r] = lbl
return board
class Robot():
def __init__(self, color, x, y, dt, strategy):
self.color = color
self.x = x
self.y = y
self.dt = dt
self.strategy = strategy
board[x, y]['bg'] = color
root.after(dt, self.move)
def move(self):
dx, dy = self.strategy()
if dx or dy:
x, y = self.x, self.y
board[x, y]['bg'] = 'white'
x, y = (x+dx) % 8, (y+dy) % 8
board[x, y]['bg'] = self.color
self.x, self.y = x, y
root.after(self.dt, self.move)
def ranmove():
return random.choice((-1, 0, 1)), random.choice((-1, 0, 1))
def upperleft():
return -1, -1
def lowerright():
return 1, 1
root = tk.Tk()
board = create_board(root)
yellow = Robot('yellow', 1, 1, 50, ranmove)
red = Robot('red', 3, 5, 100, ranmove)
blue = Robot('blue', 5, 3, 150, ranmove)
green = Robot('green', 2, 7, 300, lowerright)
black= Robot('black', 7, 1, 350, upperleft)
#root.mainloop() # Uncomment if not run from IDLE editor.
-----------
If one want a time resolution finer than 50 milliseconds, then one would
need to active mainloop even in IDLE.
--
Terry Jan Reedy
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