Lab 11.2 GraphicPolygon

Background

In Lab Assignment A6.2, we created a RegularPolygon class that maintained a large number of properties for any polygon of a given number and length of sides. By extending the RegularPolygon class to include the capabilities of the DrawingTool class, it is possible to display a graphic representation of any polygon. For example, a 9-sided regular polygon (nonagon) would be represented as follows:

Assignment

1. Extend the RegularPolygon class created in Lab Assignment A6.2 to create a GraphicPolygon class. Use the following declarations as a starting point for your lab work.

   class  GraphicPolygon  extends  RegularPolygon{  
       private  DrawingTool pen =  new  DrawingTool(new  SketchPad(400, 400));  
       private double  xPosition, yPosition;  
   
       // constructors
   
       // Initializes a polygon of numSides sides and sideLength  
       // length in the superclass. The polygon is centered at  
       // xPosition = yPosition = 0  
       public  GraphicPolygon(int  numSides,  double  sideLength){  
       }
   
       // Initializes a polygon of numSides sides and sideLength  
       // length in the superclass. The polygon is centered at  
       // xPosition = x and yPosition = y  
       public  GraphicPolygon(int  numSides,  double  sideLength,  double  x,  double  y){  
       }
   
       // public methods
   
       // Sets xPosition = x and yPosition = y to correspond to the new  
       // center of the polygon  
       public void  moveTo(double  x,  double  y){  
       }
   
       // Draws the polygon about the center point (xPosition, yPosition).  
       // Uses properties inherited from RegularPolygon to determine the  
       // number and length of the sides, the radius of the inscribed circle,  
       // and the vertex angle with which to draw the polygon  
       public void  draw(){  
       }  
   }
   

2. Write two constructor methods. The first constructor initializes the number and length of the sides of a polygon centered about the point (0, 0). The Second constructor is used to initialize a polygon a specified number and length of sides with a center at a specified x and y location.

3. Write a method that draws the polygon onto the Sketchpad window using the movement and drawing methods available in the DrawingTool class.

4. Write a method that moves the center of the polygon to a specified x and y location.

5. Write a testing class with a main() method that constructs a GraphicPolygon and calls each method. Sample usage for a polygon with 9 sides of length 100 would give:

   GraphicPolygon gPoly =  new  GraphicPolygon(9, 100);  
   gPoly.draw();
   

Instructions:

1. Use the following values to test your functions:

Square: number of sides = 4, length of side = 150
Octagon: number of sides = 8, length of side = 100
Enneadecagon: number of sides = 19, length of side = 50
Enneacontakaihenagon: number of sides = 91, length of side = 10

All files must incude your name and period in the format PX_LastName_FirstName_Title. For example, P3_Wang_Michael_GraphicPolygon.java

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