Chapter 11, Problem 9PP

Program Plan Intro

Draw a circle with two mouse presses

Program plan:

• In a file “CircleDrawerFrame.java”, import the necessary packages and create a class “CircleDrawerFrame”,
  • Declare the object “CircleDrawerComponent”.
  • Declare the object “Point2D”.
  • Initialize the frame width and height.
  • Define the constructor,
    • Create the object “CircleDrawerComponent”.
    • Initialize the maximum click.
    • Create the object “Point2D”.
    • Create a class “MousePressedListener”,
      • Define the method “mousePressed()”,
        • Check whether the click is greater than the maximum click,
        • • If it is true, return nothing.
        • Assign the value obtained from “getX()”, and “getY()”.
        • Fill the array.
        • Increment the click.
        • Check whether the click is equal to the maximum click,
        • • If it is true, Assign the value obtained from “getX()”, and “getY()”.
          • Calculate the circle’s radius.
          • Call the method “setPositionAndSize()”.
          • Set the click to “0”.
      • Define do-nothing method “mouseReleased ()”.
      • Define do-nothing method “mouseClicked ()”.
      • Define do-nothing method “mouseEntered ()”.
      • Define do-nothing method “mouseExited()”.
    • Create the object for “MousePressedListener”.
    • Call the method “addMouseListener()”.
    • Set the size.
    • Add the component.
• 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.