Drawing the American flag

Develop a DrScheme program, using the classes in the MrEd graphical toolbox, that draws and displays an image of the American flag in a separate on-screen window. The image should be closely similar in appearance to this one and should conform to the description given in President Eisenhower's executive order of August 21, 1959, which specifies the relative proportions of various components of the flag:

• The ratio between the long dimension of the flag (its ``fly'') and its short dimension (its ``hoist'') is 19/10.
• The ratio between the hoist of any of the red or white stripes and the hoist of the whole flag is 1/13.
• The ratio between the hoist of the Union (the blue rectangle in the upper left-hand corner) and the hoist of the whole flag is 7/13.
• The ratio between the fly of the Union and the hoist of the whole flag is 76/100.
• The ratio between the diameter of a circle circumscribing any of the white stars and the hoist of the whole flag is 616/10000.

If you prefer, you may write a program that draws the flag of your own home state or native country, provided that you can find an authoritative description of it. (If you take this option, you should include in your program a bibliographical reference to your source of information.)

This document is available on the World Wide Web as

http://www.cs.grinnell.edu/~stone/courses/scheme/exercises/American-flag.xhtml

created December 5, 2001
last revised December 5, 2001

John David Stone (stone@cs.grinnell.edu)