BIG JAVA: LATE OBJECTS
BIG JAVA: LATE OBJECTS
2nd Edition
ISBN: 9781119626220
Author: Horstmann
Publisher: WILEY
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Chapter 11, Problem 4PP
Program Plan Intro

Animation of cars in the opposite directions

Program plan:

  • In a file “Car.java”, import the necessary packages and create a class “Car”,
    • Declare the necessary variables.
    • Define the constructor to set the initial x and y position.
    • Declare the method “draw ()” to draw the car,
      • Create “Rectangle” object.
      • Create “Ellipse2D” object.
      • Create “Ellipse2D” object.
      • Create “Point2D” object for the bottom of the front wind shield.
      • Create “Point2D” object for the front of the roof.
      • Create “Point2D” object for the rear of the roof.
      • Create “Point2D” object for the bottom of the rear wind shield.
      • Create “Line2D” object for the top roof.
      • Create “Line2D” object for the rear wind shield.
      • Call the method “draw()” to draw the car body.
      • Call the method “draw()” to draw the car’s front tire.
      • Call the method “draw()” to draw the car’s front wind shield.
      • Call the method “draw()” to draw the car’s roof top.
      • Call the method “draw()” to draw the car’s rear wind shield.
    • Define the method “translate()” that translate the x and y position.
  • In a file “CarComponent.java”, import necessary packages, and create a class “CarComponent”,
    • Declare the “ArrayList” for “Car” objects.
    • Define the constructor to create the “ArrayList”.
    • Define the method “add()” that calls “add()” method to add the car component to the list.
    • Define the method “paintComponent ()”,
      • Call the super class method.
      • Create “Graphics2D” object.
      • Create loop to iterate over car components,
        • Call the method “draw()”.
  • In a file “CarMover.java”, import necessary packages, and create a class “CarMover”,
    • Declare and initialize the frame’s width and height.
    • Define the “main()” method.
      • Create “JFrame” object.
      • Set the frame size.
      • Set the frame title.
      • Set the operation on the frame.
      • Create “CarComponent” object.
      • Create two “Car” objects.
      • Call the method “add()” to add the first car component to the list.
      • Call the method “add()” to add the second car component to the list.
      • Add the component into the frame.
      • Make the frame visible.
      • Create a class “TimerListener”,
        • Define the method “actionPerformed()”,
          • Call the method “translate()” with “(1,0)” as arguments.
          • Call the method “translate()” with “(-1,0)” as arguments.
          • Call the method “repaint()”.
            • Create an object for “TimerListener”,
            • Set the milliseconds between the timer ticks.
            • Create the object for “Timer”.
            • Call the method “start()”.

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