Write a Drawing program in C#.

A number of key requirements need to be followed.

Use an ArrayList or generic List to save each graphic object for painting.

Undo deletes the last graphics object in the list. Be sure the program doesnt crash if you try to undo an empty list.

Create a base class from which all graphics elements are derived. This class has a Draw method that is declared virtual and is overridden in each derived class. It has one argument which is a Graphics object.

The constructor for each derived graphic object takes arguments of your choice such as the brush, pen, dimensions and location.

You draw the objects with a foreach loop with a call to Draw. Polymorphism handles invoking the Draw method in the appropriate class.

The form consists of a menu strip, a panel docked to the top, and a panel docked with the fill style. These controls should be added in the above order to ensure correct operation.

The mouse event handler for the drawing panel must be created for that panel and not the main form or the mouse coordinates will not be relative to the panel.

You must also use a paint event handler for the panel and not the form for drawing your graphics objects.

All objects are drawn with two mouse clicks. This sets the boundaries of the box containing the object.

You should be able to click on any two opposite corners and not just the upper left and lower right.

You must adjust the fill of a filled object to account for the width of the border (outline). For example, if the border is 10 pixels then the dimensions of the fill must be reduced by 5 pixels along each border. Think about how to accomplish this. There is an easy and a hard way. (Z-order?)

If no fill or outline is specified then an object is not drawn and not added to the list. A message is also displayed to alert the user.

You will need to keep a state variable to determine whether a mouse click is the first or second. The object is added on the second click.

Be careful to implement the settings dialog to be the same as the example

These are some sample outputs of how your application should look like.

Eile Edit Draw Line Rectangle Ellipse Settings