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.

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Chapter 11, Problem 10PP

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.

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