Chapter 10, Problem 16PP

Program Plan Intro

Triangle

Program plan:

• In a file “TriangleDrawerComponent.java”, import necessary packages and create a class “TriangleDrawerComponent” that extends “JComponent” class,
  • Declare the array.
  • Declare the variable.
  • Declare the necessary static variable.
  • Define the constructor,
    • Fill the array.
    • Set the number of points to “0”.
  • Define the method “set_FirstPoint()” to set the coordinates for first point.
    • Call the method the method “set_Point()”.
  • Define the method “set_SecondPoint()” to set the coordinates for second point.
    • Call the method the method “set_Point()”.
  • Define the method “set_ThirdPoint()” to set the coordinates for third point.
    • Call the method the method “set_Point()”.
  • Define the method “set_Point()” to set the coordinates for “idx” point.
    • Check the condition,
      • Fill the array.
      • Increment the number of points.
  • Define the method “clear_Points()” to clear the points.
  • Define the method “paintComponent()” to paint the component,
    • Call the super class method “paintComponent()”.
    • Create the object fro “Graphics2D”.
    • Check whether the point is greater than “0”,
      • If it is true, call the method “draw()” to draw the component.
        • Check whether the point is greater than “1”,
        • • If it is true, call the method “draw()” to draw the component.
        • Check whether the point is greater than “0”,
        • • If it is true, call the method “draw()” twice to draw the component with different points.
• In a file “TriangleDrawerFrame.java”, create a class “TriangleDrawerFrame” that extends “JFrame” class,
  • Declare the object of “TriangleDrawerComponent”.
  • Initialize the frame width and size.
  • Define the constructor,
    • Create the object for “TriangleDrawerComponent”.
    • Initialize the maximum clicks.
    • Create a class “MousePressedListener” that implements “MouseListener”.
      • Define the method “mousePressed()”,
        • Check whether the click is greater than the maximum click initialized.
        • Set the click to “0”.
        • Assign the value returned from the method “getX()”.
        • Assign the value returned from the method “getY()”.
        • Check whether the click is “0”,
        • • Call the method “set_FirstPoint()”.
        • Check whether the click is “1”,
        • • Call the method “set_SecondPoint()”.
        • Check whether the click is “2”,
        • • Call the method “set_ThirdPoint()”.
        • Call the method “repaint()”.
        • Increment the click by “1”.
        • • • Define do-nothing method “mouseReleased()”,
            • Define do-nothing method “mouseClicked()”,
            • Define do-nothing method “mouseEntered()”,
            • Define do-nothing method “mouseExited()”,
            • Set the click to “0”.
    • Create an object “MousePressedListener”.
    • Call the method “addMouseListener()”.
    • Call the method “setSize()” to set the size.
    • Add the component.
• In a file “TriangleDrawerTester.java”, import necessary package, and create a class “TriangleDrawerTester”,
  • Define the method “main()”,
    • Create “JFrame” object.
    • Set the title for the frame.
    • Set the operation on the frame.
    • Make the frame visible.