Christopher Currie is a doctoral candidate in the Experimental Psychology Program, Human Perception and Performance Group in the Beckman Institute For Advanced Science and Technology at the University of Illinois, Urbana-Champaign. In addition to his research involving eye-movements and scene perception, he is involved in a Web-based project designed to provide laboratory experience to complement psychology lecture courses and to educate the general public about sensation, perception and cognition. Support of the development of the package classes presented in this article was provided by the "Internet Psychology Laboratory" project (http://kahuna.psych.uiuc.edu/ipl2) and the University of Illinois at Urbana-Champaign
This article will show you how to create an interactive, graphics-based
applet by designing only the graphical objects themselves and by specifying
their behavior given some external event (i.e., a mouse click or a button
press). The ipl and ipl.graphics classes and interfaces will let you design
with both notification and interfaces, in order to coordinate communication
between your graphical objects and between the graphical objects and the
display medium (i.e., a canvas object). This article will also show you how
to "wire-up" your interactive applet to buttons in order to give the user
control over your graphical objects.
I will assume that you are familiar with the Observer-Observable design
pattern of notification. The notification scheme used here is adopted from ... (more)
Christopher Currie is a doctoral candidate in the Experimental Psychology 
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