Building Java Programs: A Back To Basics Approach (5th Edition)
Building Java Programs: A Back To Basics Approach (5th Edition)
5th Edition
ISBN: 9780135471944
Author: Stuart Reges, Marty Stepp
Publisher: PEARSON
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Chapter 3G, Problem 1PP
Program Plan Intro

Draw given picture

Program plan:

  • Import necessary package.
  • Create a class “DrawPattern”,
    • Define the method “main()”,
      • Construct “DrawingPanel” object.
      • Set panel's background color as “CYAN”.
      • Create "Graphics" object and call "getGraphics()" method.
      • Assign the properties for top left point.
      • Initialize the values.
      • Create "Point" object for bottom left point.
      • Initialize the variables.
      • Create "Point" object for top right point.
      • Initialize the variables.
      • Create "Point" object for bottom right point.
      • Initialize the variables.
      • Call the method "draw_Pattern()" to draw the top left rectangle.
      • Call the method "draw_Pattern()" to draw the Bottom left rectangle.
      • Call the method "draw_Pattern()" to draw the top right rectangle.
      • Call the method "draw_Pattern()" to draw the bottom right rectangle.
    • Define the method “draw_Pattern()”,
      • Assign the values.
      • Execute loop for number of rows,
        • Execute loop for number of columns,
          • Compute the top center point of a single rectangle.
          • Set the color to "GREEN".
          • Call the method "fillRect()" to fill the rectangle with GREEN color.
          • Set the color to "BLACK".
          • Call the method "drawRect()" to draw the rectangle with BLACK border.
          • Create an object for "Point" class.
          • Call the method "draw_Circle()" to draw the circle.
          • Set the color to "BLACK".
          • Draw the vertical line.
          • Draw the horizontal line.
          • Execute condition to draw the circles inside the rectangle,
            • Update the “x1” value.
        • Update “y1” value.
        • Reset x coordinate.
    • Define the method “draw_Circle()”,
      • Compute the gap between the circles within the rectangle.
      • Initialize the values for circle width and height.
      • Initialize the top left point of circle.
      • Execute loop for a number of circles,
        • Set color to "YELLOW".
        • Call the method to fill the oval with "YELLOW" color.
        • Set color to "BLACK".
        • Call the method to oval shape with "BLACK" color.
        • Compute next circle at top left corner.
        • Compute the width and height of next circle.
              • Initiate coordinate value of next row.
                • Update the value.

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