Graphic programming using Turtle class in Python

Graphic programming using Turtle class in Python

• 1.
  Turtle Graphics
• 2.
  The turtle MODULE Pythonallows you to import extra modules, specifically written for Python users. One of them is called turtle. You must import it to use it. You can then open a graphics window. import turtle # so we can use the turtles library of commands win = turtle.Screen() # creates a graphics window
• 3.
  The Turtle CLASS ATurtle is an example of class. ( turtle.Turtle()) When you create a new turtle it is called an INSTANCE. You can also call it an OBJECT. import turtle win = turtle.Screen() #make an instance of a turtle and we will call it delia delia = turtle.Turtle()
• 4.
  Turtle attributes Now youhave an object called delia, you can give the turtle unique characteristics or ATTRIBUTES like shape and speed. The list of attributes you give to the Turtle will make delia a unique turtle.
• 5.
  Example Predict the shapethat the Turtle delia will draw following the algorithm below.
• 6.
  Examples of somemore attributes and instructions
• 7.
  from turtle import* color('red', 'yellow') begin_fill() while True: forward(200) left(170) if abs(pos()) < 1: break end_fill() done() import turtle skk = turtle.Turtle() for i in range(4): skk.forward(50) skk.right(90) turtle.done()
• 8.
  star = turtle.Turtle() star.right(75) star.forward(100) fori in range(4): star.right(144) star.forward(100) turtle.done() wn = turtle.Screen() wn.bgcolor("light green") skk = turtle.Turtle() skk.color("blue") def sqrfunc(size): for i in range(4): skk.fd(size) skk.left(90) size = size + 5 sqrfunc(6) sqrfunc(26) sqrfunc(46) sqrfunc(66) sqrfunc(86) sqrfunc(106) sqrfunc(126) sqrfunc(146)
• 9.
  Class Task • Createtwo instances of a turtle. • Call them delia and arthur. • delia is to go to position (50,50) and draw a square with that as centre. She then has to go to these 3 points, without leaving a trail, and stamp the 3 points …(-30,30), (100,-50), (0,0) • arthur is to draw two circles. One of radius 50 centre(0,0) and another of radius 40 centre (100,-50). Also the circles are to be filled with colours.
• 10.
  Challenge • Ask theuser for the coordinates of the centre of a circle, a radius and a fill colour. • Get these properties for both delia and arthur and instruct them to draw the circles. • Finish with a stamp on the centre. • Write on each circle the properties given by the user. • For example “This is a red circle, centre (30,-30) and radius 45.”