Extending the line drawing program

Document your code using javadoc

Extend the Line Pix assignment to allow users to draw lines and rectangles.

• Write a Shape class. This class can initially be empty, i.e no properties and no methods.
• Develop your own Rectangle class that extends the Shape class. Do not use the Rectangle class in the java.awt package.
• Have your Line class extend the Shape class.
• Modify the menu so that the user can indicate whether they will be drawing a line or a rectangle.
• The user interaction for drawing rectangles is similar to that for drawing lines.
• Drawing a rectangle starts with a mouse press. Call this point A.
• As the user drags the mouse, a rectangle appears whose top left corner corresponds to point A and whose bottom right corner corresponds to the current location of the mouse.
• The point where the user releases the mouse marks the final location of the bottom right corner of the rectangle.
• Create an ArrayList of Shapes. All lines and rectangles are added to this ArrayList when they are created.
• To draw all the lines and rectangles, traverse the ArrayList of Shapes and send each element in the ArrayList the draw(g) message, where g is a reference to the Graphics context of the drawing panel.
• What modifications are needed to the Shape class to enable this?