CSC111 Moving Graphic Objects

--D. Thiebaut (talk) 09:48, 20 April 2014 (EDT)

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A car that moves out of the canvas

The example program below requires the graphics library available on this page.

# carMovesRight.py
# D. Thiebaut
# Demonstrates the user the graphics111 library with
# moveable objects, menu, and event-driven programming
# This program creates a car, and then moves it to the right
# by the amount in deltaX until the car disappears from the 
# canvas.

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 )

    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 )
        


# ========================================================
#                       Main Program
# ========================================================
def main():
    # make the menu and car global so that they will
    # be accessible to the call-back function
    global menu, car

    # 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 )

    car = Car( 150, 75, 100, 20, (250, 250, 0 ) )
    car.draw( canvas )

    deltaX = 5
    for i in range( MAXWIDTH//deltaX ):
        car.move( canvas, deltaX, 0 )
        
    # wait and respond to events, or comment out and make the program
    # stop as soon as car disappears.
    win.wait()
    win.close()
    
main()