Chapter 11, Problem 7PP

Program Plan Intro

To draw a circle with user inputs

Program plan:

• In a file “CircleDrawerFrame.java”, import the necessary packages and create a class “CircleDrawerFrame”,
  • Declare the object “CircleDrawerComponent”.
  • Initialize the frame width and height.
  • Define the constructor,
    • Create the object “CircleDrawerComponent”.
    • Call the method “setPreferredSize ()”.
    • Create “JPanel” object.
    • Call the method “add()”.
    • Add the component into the panel.
    • Set the frame size.
    • Add the panel.
  • Define the method “createDrawButton ()”,
    • Create a button
    • Create a class “DrawButtonListener”,
      • Define the method “actionPerformed()”,
        • Assign the value.
        • Assign the value for y position.
        • Get the inputs “x”, “y”, and “radius” from the dialog box.
        • Call the method “setPositionAndSize ()” to draw the car’s front wind shield.
        • • Create object fro “DrawButtonListener”.
          • Call the method “addActionListener()”.
          • Return the button activity.
• In a file “CircleDrawerComponent.java”, import necessary packages, and create a class “CircleDrawerComponent”,
  • Declare the necessary variables.
  • Define the constructor.
  • Define the method “setPositionAndSize ()” that sets the “x”, “y”, and “radius”.
  • Define the method “paintComponent ()”,
    • Call the super class method.
    • Create “Graphics2D” object.
    • Create “Ellipse2D” object.
    • Call the method “draw()”.
    • Call the method “repaint()”.
• In a file “CircleDrawerView.java”, import necessary package, and create a class “CircleDrawerView”,
  • Define the “main()” method.
    • Create “JFrame” object.
    • Set the frame title.
    • Set the operation on the frame.
    • Make the frame visible.