Smalltalk-80 was also good for graphics programming.

Around 1990, I was a graduate student in Prof. Red Whittaker's field robotics group at Carnegie Mellon. In Porter Hall, I was fortunate to have a Sun 3/60 workstation on my desk. It had a Smalltalk-80. I learned to program it using Goldberg & Robson and other books from ParcPlace Systems.

The programming environment was fantastic, better than anything I have seen before or since. You always ran it full screen, and it loaded up the Smalltalk image from disk. As the article says, you were in the actual live image. Editing, running, inspecting the run-time objects, or debugging: all these tasks were done in the exact same environment. When you came into the office in the morning, the entire environment booted up immediately to where you had left it the previous day.

The image had objects representing everything, including your screen, keyboard, and mouse. Your code could respond to inputs and control every pixel on the screen. I did all my Computer Graphics assignments in Smalltalk. And of course, I wrote fast video games.

I used the system to develop programs for my Ph.D thesis, which involved geometric task planning for robots. One of the programs ran and displayed a simulation of a robot moving in a workspace with obstacles and other things. I had to capture many successive screenshots for my papers and my thesis.

Everybody at CMU then wrote their papers and theses in Scribe, the document generation system written by Brian Reid decades earlier. Scribe was a program that took your markup in a plain text file (sort of at a LaTeX level: @document, @section, etc.) and generated Postscript for the printer.

I never had enough disk space to store so many full screen-size raster images. So, of course, instead of taking screenshots, I modified my program to emit Postscript code, and inserted it into my thesis. I had to hack the pictures into the Postscript generation process somehow. The resulting pictures were vector graphics using Postscript commands. They looked nice because they were much higher resolution than a screenshot could have been.