Tianbin-GitHub Page

This GitHub project provides GitHub Pages and Data Strucutres Python code in the same Repository.

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Turtle Graphics

• Goal: to develop a simple simulation with Turtle Graphics
• The use of
  • functions and methods
  • parameters, abstractions
  • simulation to explore behavior
• Using JES (MediaComputation) version 6.0 https://github.com/gatech-csl/jes/releases

Example 1: Worlds and Turtles

<!-- return values... -->
<!-- functions return values -->
def newTurtle():
  w = makeWorld(500, 500)
  t = makeTurtle(w)
  return t

• now t = newTurtles() creates a world, turtle and returns it
• w = makeWorld(500, 500) creates a world with 500x500 space large

Moving turtles

<!-- Moving turtles -->
>>> t = newTurtle()
>>> t.forward()
>>> t.setBodyColor(red)
>>> t.setColor(red)
>>> t.turnRight()
>>> t.forward()
>>> t.setPenWidth(4)
>>> t.forward()

• forward(t,d) - move t forward d units, default is 100

• turnRight(t) - turn t 90 degrees to the right

• functions also available as methods off the turtle itself
• forward(t) - t.forward()

Information about each turtle

• Each turtle has a series of attributes that are “stored” within the turtle
  • Location - each turtle has its own location t.getXPos(), t.getYPos()
  • Color - each has its own color: t.setBody Color (red)
  • Width of the pen: t.setPenWidth (2)
  • Pen Up/Down: t.penDown() or t.penUp() or t.clearPath()
  • Control visibility t.hide(), t.show(), t.isVisible()

Example 2: Move turtles

• Create a world and put turtles in it
• Define our own move that will move the turtle and turn randomly

  <!-- Define our own move -->
  def move(t):
  t.turn(random.randint (-45, 45))
  t.forward(50)
  ...
  

  

Example 3: Simulation

• Create a number of turtles
  • Each moves a different direction (randomly selected)
  • Each a different color
• Let them run around and see what happens

Example 4: Simulation

• Same simulation but … now if two turtles are near each other, then one of them hides
  • hide the turtle
  • hide the path
• Let them run around and see what happens

Example 5: CSPTurtle

• Create an object oriented turtle that can keep some information internally
  • counter that when turtle hides, it stays hidden for number of cycles, then comes back ```html

    is t afraid of other

    t.afraid(other) : true/false

hide t

t.hideMe()

#run again (if enough time has lapsed) t.runAgain() ```

Wrapping up

• Functions can return values that can be used for other purposes
• Functions can be used to build (encapsulate) common behavior to facilitate reuse
• The names of the functions become like a mini language to describe the problem
• Classes can encapsulate data/functions to make your code easier to read