Pre-Lab Assignment:
Experimenting with the CMU Graphics Package

Familiarizing yourself with the CMU Graphics Library.^*

• The CMU Graphics Package comes with a demo program. Compile and run this program to get a sense of some of the capabilities of the graphics package. (Alternatively, replace the demo file in the project with the simplified ABdemo and compile and run that.) Your instructor will give you more detailed instructions on how to do this in your lab.

• Now compile and run the program using the ABhouse program (which is a subset of the demo program consisting of just the first screen) instead of the demo program. You may need to download the header file for WaitNClear. Make sure that the WaitNClear implementation file will be compiled in as part of your program. Your instructor will give you more detailed instructions on how to do this in your lab.

• Once you have the ABhouse program running, edit ABhouse.cpp. Notice that the graphics package is accessed through a window object that "knows" how to draw. The main function instantiates a window object and "passes messages" to the object telling it to do what is needed to make the drawing.

• Compared to the size of the house and the size of the windows, the door of the house is quite small. Modify the two constants that determine the door size to make it better-proportioned for the size of the house. Compile and run the program to test your changes.

Save the modified program.

^*The CMU Graphics Library was created by the Carnegie Mellon University School of Computer Science and is used in their introductory programming courses. It is available from Mark Stehlik's Advanced Placement page.