YOU LEARN HERE...

how to create animated computer graphics. An animation consists of individual images that change only slightly and are displayed step by step one after the other. As the human eye can only capture around 25 images per second, the result is a smooth, jerk-free movement, just like a movie, if the image sequence is shown fast enough. You can draw the images with the Turtle or load them as image files

EXAMPLE

In your example, you program a rotating propeller. As the animated figure is used several times, it is advantageous to build the program modularly, i.e. to display the figures using functions. This makes your program clearer. Use the functions bogen(), blatt() and propeller() to draw a 3-bladed propeller.

You can describe the animation sequence like this: repeat:      draw figure      wait a short time      delete the figure      change the turtle direction a little Simple figures can be deleted by painting over them with the background color. As a rule, however, it is easier to clear the entire window with clear(). clear() deletes the window.

Program: [► WebTigerPython]   [► WebTigerJython]

from gturtle import *

def bogen():
    repeat 45:
        forward(3)
        right(2)
        
def blatt():
    startPath()
    bogen()
    right(90)
    bogen()
    left(150)
    fillPath()
    
def propeller():
    repeat 3:
        blatt()
        right(120)    
        
hideTurtle()
setFillColor("blue")

repeat:
    propeller()
    delay(40)
    right(4)
    clear()

Example 2: Running clock First, write a function that draws the clock face. The hand is drawn at a new position every 300 milliseconds. Before you draw the hand at the new position, paint over the hand at the old position with the white color.

Program: [► WebTigerPython]   [► WebTigerJython]

from gturtle import *

def watchFace():
    setPenColor("black")
    penUp()
    repeat 12:
        forward(110)
        dot(10)
        back(110)
        right(30)
    penDown()
    
def hand():
    setPenWidth(5)
    forward(90)
    back(90)
    
watchFace()

a = 0
while True:
   setHeading(a) 
   setPenColor("red")
   hand()
   delay(300)
   setPenColor("white")
   hand()
   a += 30

REMEMBER...

TO SOLVE BY YOURSELF