Chapter 13, Problem 13PP

Program Plan Intro

Snowflake shape

Program plan:

Filename: “KochComponent.java”

This program file is used to define a class “KochComponent”. In the code,

• Define a class “KochComponent”.
  • Declare an integer “numIterations”.
  • Define the constructor “KochComponent()”.
    • Set the value of “numIterations”.
  • Define the constructor “paintComponent()”.
    • Set “length”.
    • Set the points “x1”.
    • Set the points “y1”.
    • Set the points “x2”.
    • Set the points “y2”.
    • Set the points “x3”.
    • Set the points “y3”.
    • Call the method “draw()”.
  • Define the method “draw()”.
    • If the value of “iteration” is equal to “1”.
      • Create an object “g2” of “Graphics2D”.
      • Define the object “line” of “Line2D”.
      • Call the method “draw()” using “g2”.
        • Else,
        • • Set the “angle”.
          • Get “dx”.
          • Get “dy”.
          • Set “x3”.
          • Set “y3”.
          • Set “x4”.
          • Set “y4”.
          • Set “x5”.
          • Set “y5”.
          • Call the method “draw()”.

Filename: “KochFrame.java”

This program file is used to define a class “KochFrame”. In the code,

• Import the required packages.
• Define a class “KochFrame” by extending “JFrame”.
  • Define required constants.
  • Create a variable “component” of type “KochComponent”.
  • Define the constructor “KochFrame ()”.
    • Call “setSize()” to set the size of the frame.
    • Call “setTitle()” to give the title to frame.
    • Create a panel by defining the object of “JPanel”.
    • Call “add()” to add a button.
    • Define “component”.
    • Call “setPrefferedSize()” on “component”.
    • Call “add()” to add “component” to “panel”.
  • Define the method “JButton ()”.
    • Create a button “button”.
    • Define “ButtonListener”.
      • Call “actionPerformed()” to give action to button.
        • Call “next()” using “component”.
        • • Call “addActionListener()”.
          • Return button.

Filename: “KochViewer.java”

This program file is used to define a class “KochViewer”. In the code,

• Define a class “KochViewer”.
  • Define the method “main()”.
    • Define the object “frame” of “KochFrame”.
    • Call the method “setTitle()”.
    • Close the frame using “setDefaultCloseOperation()”.
    • Call “setVisible()”.