Attribute Error

[gunneronaspooky]

Ok folks...more help with a programming class...

I'm seriously starting to think programming is not for me, but I just want to finish out this class with a decent grade. I'm not looking for answers...just some guidance in the right direction.

Here is the problem...

As an exercise, write a function named moveRect that takes a
Rectangle and two parameters named dx and dy. It should change
the location of the rectangle by adding dx to the x coordinate of corner
and adding dy to the y coordinate of corner.

Here is what I have so far...

class Rectangle:
    pass
class Point:
    pass

box = Rectangle()
box.width = 100
box.height = 200

box.corner = Point()
box.corner.x = 0.0
box.corner.y = 0.0

def findCenter(box):
    p = Point()
    p.x = box.corner.x + box.width/2.0
    p.y = box.corner.y - box.height/2.0
    return p

def printPoint(p):
    print "(" + str(p.x) + ", " + str(p.y) + ")"

center = findCenter(box)
printPoint(center)

def moveRect(box, dx, dy) :
    box.corner = Point()
    box.corner.x = box.corner.x + dx
    box.corner.y = box.corner.y + dy

When I run it and input variables for dx and dy, it gives me this error:

>>> moveRect(box, 10, 20)

Traceback (most recent call last):
  File "<pyshell#14>", line 1, in <module>
    moveRect(box, 10, 20)
  File "C:/Users/Tony/Documents/Module 4 CS/moveRect", line 28, in moveRect
    box.corner.x = box.corner.x + dx
AttributeError: Point instance has no attribute 'x'

Thanks for any help.

[woooee]

The first thing you have to do is decide which GUI toolkit you wish to code for as you will have to move, or destroy/remove the original rectangle graphic and draw/display it in a different location depending on the toolkit. A pretty standard example using Tkinter:

import Tkinter as tk
import time
 
root = tk.Tk()
 
canvas = tk.Canvas(root, width=400, height=400)
canvas.pack()
 
# canvas.create_rectangle(x0, y0, x1, y1, option, ... )
# x0, y0, x1, y1 are corner coordinates of ulc to lrc diagonal
rc1 = canvas.create_rectangle(20, 260, 120, 360, outline='white', fill='blue')
rc2 = canvas.create_rectangle(20, 10, 120, 110, outline='white', fill='red')
 
for j in range(50):
    y = x = 5
    time.sleep(0.05)
    canvas.move(rc1, x, -y)
    canvas.move(rc2, x, y)
    canvas.update()
 
root.mainloop()

[Boubakr]

try with:

try:
	# what you want ...
except AttributeError:
	print "The Error message"
else:
	break

[richieking]

is this tk?

[woooee]

We don't know which GUI toolkit is being used and the OP hasn't responded for 6 days, so this thread is dead.