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Turble Graphics
Donated to the public domain by:
Bruce McKinney
10315 Wallingford Ave. N.
Seattle, WA 98133
206-526-8066
Turble Graphics is a collection of programming tools for Turbo Pascal
2.0 on IBM or PC-compatible computers. A graphics board is required.
The routines use color, but they will also work on a black and white
graphics monitor.
Version 0.9 is a test version being released locally. Version 1.0
will be released later as ShareWare. This version contains some
inconvenient limitations (as noted in the listing comments). Some of
them will be corrected before version 1.0. Others will have to wait
for a later release using assembler interfaces. Your suggestions are
appreciated.
These graphics tools enable you to use the concepts of Turtle
graphics, which is similar to Logo graphics. Several Pascal
implementations use Turtle graphics. For example, a turtle graphics
library is available for Apple computers. Most graphics program
listings in books about Apple Pascal can be run with little change
using Turble Graphics.
Before using the procedures, you should find the screen aspect of your
monitor. Compile and run program ASPECT.PAS. It will draw a vertical
and a horizontal line. Measure the lines on your screen and enter to
values as decimal fractions (it's easiest to measure in centimeters).
The program will return the aspect and maximum height of your screen.
Fill in these values in place of the sample values in file TURBLE.PAS.
File TURBLE.REF has a list of all the constants, variables,
procedures, and functions available to you. If you have Sidekick, you
can put TURBLE.REF in your notepad for instant on-line help.
This program owes a lot to LadyBug, a public domain version of Logo
Turtle Graphics. I also learned a lot from Tom Swan's book on Apple
Pascal graphics. Most of the programs in that book could easily be
adapted for Turble Graphics.
Several programs that use Turble Graphics are provided as samples:
BEEDEMO.PAS Moves a bee across the screen
FIGDEMO.PAS Draws various figures
HEXDEMO.PAS Illustrates mode, color, palette, intersects
These programs should give you a good idea of what Turble can do. You
need to have all Turble programs on the same drive and directory to
compile and run them. The comments in the programs in the listings
should explain all. You're on your own. Have fun.