How do i Clone an object?

Fuugie

I am having trouble trying to clone a tree i made. Any suggestions?

My Input:

Expand|Select|Wrap|Line Numbers

 
from cs1graphics import *
 
paper = Canvas(300, 200, 'skyBlue', 'My Forest')
 
grass = Rectangle(300, 80, Point(150,160))

grass.setFillColor('green')

grass.setBorderColor('green')

grass.setDepth(75)                

paper.add(grass)
 
tree1 = ('tree', 'tree_bottom', 'tree_base')

tree = Polygon(Point(50,80), Point(30,125), Point(70,125))

tree.setFillColor('darkGreen')

paper.add(tree)
 
tree_bottom = Polygon(Point(50,80), Point(30,150), Point(70,150))

tree_bottom.setFillColor('darkGreen')

paper.add(tree_bottom)
 
tree_base = Polygon(Point(50,150), Point(45,165), Point(55,165))

tree_base.setFillColor('brown')

paper.add(tree_base)
 
tree2 = tree1.clone()

tree2.move(170,30)

tree2.scale(1.2)

paper.add(tree2)

Error:

Expand|Select|Wrap|Line Numbers

 
Traceback (most recent call last):

  File "C:/Users/Robert/Documents/CSIS Projects/Ex3_8.py", line 30, in <module>

    tree2 = tree1.clone()

AttributeError: 'tuple' object has no attribute 'clone'

bvdet

I can see how you got the error. This will not work, because a tuple object has no method named clone:

Expand|Select|Wrap|Line Numbers

 tree1 = ('tree', 'tree_bottom', 'tree_base')

tree2 = tree1.clone()

What is tree2 supposed to be?

dwblas

"clone" is too vague. You have at least 2 options with a tuple/list
tree2 = tree1
creates a reference to tree1, i.e. they both point to the same block of memory, so if you change one, you change both. For a copy, you have to convert to a list.

Expand|Select|Wrap|Line Numbers

 import copy

tree1 = ('tree', 'tree_bottom', 'tree_base')

tree2 = tree1

print tree2

print id(tree2), id(tree1)   ## they are the same
 
tree3 = copy.copy(list(tree1))   ## shallow copy (look it up)

print tree3

print id(tree3), id(tree1)   ## they are different

How do i Clone an object?

✓ answered by bvdet

Post your reply

Similar topics

Question stats

	Ask Question
Home Questions Articles Browse Topics Latest Top Members FAQ