Write a program called Squares that uses the DrawingPanel to draw the shape shown in Figur...

Write a program called Squares that uses the DrawingPanel to draw the shape shown in Figure.

Figure

The DrawingPanel is 300 pixels wide by 200 pixels high. Its background is cyan. The horizontal and vertical lines are drawn in red and the diagonal line is drawn in black. The upper-left corner of the diagonal line is at (50, 50). Successive horizontal and vertical lines are spaced 20 pixels apart.