public Retangle(DrawingProgramming dp, int width, int height)
     : base(dp)
 {
     this.Width  = width;
     this.Height = height;
 }
 public Triangle(DrawingProgramming dp, int rows)
     : base(dp)
 {
     this.Rows = rows;
 }
 public Shape(DrawingProgramming dp)
 {
     this.Dp = dp;
 }