“VIEW: an exploratory molecular visualization system with user-definable interaction sequences” by Bergman, Richardson, Richardson and Brooks Jr.

VIEW is an exploratory visualization system for studying the structures of molecules. The system supports a high degree of complex
user interaction with the image. Visualizations are constructed by
selecting drawing tools from a library. Each tool uses parameters
obtained from interactive selection of on-screen geometry by the
user, and from a molecular database.
The system is based on a tight coupling of on-screen geometry with
the underlying database. Using these links, tools can create truescale drawing elements that are constrained to database values.
VIEW is highly extensible by the user or a paraprogrammer associated with the user. Drawing tools are written in a C-like programming language with constructs for managing databases, constructs
for creating and altering geometry, as well as standard statements
such as If-Else and For loops.
An event-definition mechanism allows the user to describe actions to
be performed when keys are depressed or dials turned. In addition, the
user is able to specify conditional events – actions that are to be taken
whenever a user-defined condition becomes true. These conditions
are automatically evaluated by the system as part of event processing.
Such conditional events allow simple simulations to be readily programmed. Applications of conditional events have included animations of protein binding activity, and an interactive “flashlight” which
highlights structures as a cursor is steered through a molecule.
The system includes a development environment complete with a
WYSIWYG editor, an interactive debugger, and a set of innovative
graphical debugging features

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