Difference between revisions of "CSC111 Resizing Graphic Objects"
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This example uses the graphics library available on [[CSC111 Event-Driven Programming with Graphics111.py 2014 | this page]]. | This example uses the graphics library available on [[CSC111 Event-Driven Programming with Graphics111.py 2014 | this page]]. | ||
+ | |||
+ | The resize method of the '''Car''' class performs the resizing in two steps: | ||
+ | * First all the components of the car are ''removed''. This effectively removes them from the canvas, and forces the canvas to "forgets" them. | ||
+ | * It then calls the '''__init__()''' constructor to create a brand new collection of components (body, top, wheels). | ||
+ | |||
<br /> | <br /> |
Revision as of 11:22, 20 April 2014
--D. Thiebaut (talk) 11:15, 20 April 2014 (EDT)
This example uses the graphics library available on this page.
The resize method of the Car class performs the resizing in two steps:
- First all the components of the car are removed. This effectively removes them from the canvas, and forces the canvas to "forgets" them.
- It then calls the __init__() constructor to create a brand new collection of components (body, top, wheels).
# Demo program for resizing a graphic object.
# D. Thiebaut
#
from graphics111 import *
from random import seed
from random import randrange
from time import sleep
MAXWIDTH = 800
MAXHEIGHT = 600
class Car:
def __init__( self, x, y, width, height, color ):
self._x = x
self._y = y
self._width = width
self._height = height
self._color = color # list of 3 ints between 0 and 255
# build the body
self._top = Rectangle( x+width//4, y-height//2,
width//2, height//2,
color )
self._body = Rectangle( x, y, width, height, color )
# build the wheels
self._w1 = Wheel( x + width//4, y + height, width//5 )
self._w2 = Wheel( x + 3*width//4, y + height, width//5 )
self._valid = False
def setRandomColor( self ):
self._top.setRandomColor()
self._body.setRandomColor()
def getTotalHeight( self ):
return self._height*2 + self._width//10
def getTotalWidth( self ):
return self._width
def draw( self, canvas ):
self._canvas = canvas
self._body.draw( canvas )
self._top.draw( canvas )
self._w1.draw( canvas )
self._w2.draw( canvas )
def move( self, canvas, dx, dy ):
self._body.move( canvas, dx, dy )
self._top.move( canvas, dx, dy )
self._w1.move( canvas, dx, dy )
self._w2.move( canvas, dx, dy )
self._x = int( self._x + dx )
self._y = int( self._y + dy )
def resize( self, canvas, scaleFactor ):
self._body.remove( canvas )
self._top.remove( canvas )
self._w1.remove( canvas )
self._w2.remove( canvas )
self.__init__( self._x, self._y,
int( self._width * scaleFactor ),
int( self._height * scaleFactor ),
self._color )
self.draw( canvas )
# ========================================================
# Main Program
# ========================================================
def main():
# open the window and get access to its canvas
win = GraphicsWindow(MAXWIDTH, MAXHEIGHT)
canvas = win.canvas()
# draw something
p1 = Polygon( (100, 100, 150, 50, 350, 50, 400, 100), (255, 0, 0 ) )
p1.draw( canvas )
car1 = Car( 150, 75, 100, 20, (250, 250, 0 ) )
car1.draw( canvas )
scaleFactor = 1.05
for i in range( 0, 40 ):
car1.resize( canvas, scaleFactor )
# wait and respond to events
win.wait()
win.close()
main()