Big Java Late Objects
Big Java Late Objects
2nd Edition
ISBN: 9781119330455
Author: Horstmann
Publisher: WILEY
Question
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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.

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