Homework 4:  C# Application

The goal of this homework is to gain experience in developing user interfaces using the C# programming language.  The basic principles learned here in C# will carry over to many other GUI programming languages.

Develop a simple drawing application that enables users to draw pictures using the mouse.  User required features are:

• drawing straight line segments using a line tool. Click-and-drag on the drawing canvas to draw a straight line segment between the click point and the release point.  For full credit, the line should cleanly visibly stretch like a rubber band as you drag before you release.
• controlling the color of the line tool;  multiple colors can be used in a single picture.
• controlling the width of the line tool with a slider; multiple line widths can be used in a single picture.
• unlimited "undo" of lines.
• selective deletion of lines. Clicking on/near an endpoint of a line deletes it. If near multiple lines, delete any 1. (This is the hard one, save for last).
• clearing the canvas.
• show an "About" popup dialog box that displays your name.

Also, the application window containing the drawing canvas must:

• be resizable (with the canvas resizing to fill the available window space).
• not lose the current drawn picture when the window is resized or manipulated in any way.

Submission procedure:  (CHANGED!)

Post your submissions to the instructor using the Blackboard system at learn.vt.edu.  Use the TOOLS > DIGITAL DROP BOX feature to send a zip file to us that is named <yourPID>.zip and contains:

• your compiled draw.exe file
• your application project directory and files, including your *.cs files.