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.