🚀 go-pugleaf

I've added two new examples of using my TPantograph non-visual
object in my freeware 2D/3D graphics library.  This library is intended
mostly for use with floating-point calculations.  You can work directly
with world coordinates instead of pixel coordinates.

I don't have a web site, but I'll E-mail anyone interested in these
updates.  You'll only get Delphi 3 source (~50K zipped) unless you
ask specifically for the EXEs (~560K zipped).

Here's the Readme file that has more information:


Delphi 3 2D/3D Graphics Libraries and Examples
for
Scientific/Engineering/Mathematical Applications

by

Earl F. Glynn
EarlGlynn@WorldNet.att.net
Overland Park, KS  66214

Copyright (C) 1997, Earl F. Glynn.  All Rights Reserved.
May be used freely for non-commercial use.

These libraries and examples were tested in Delphi 3.  They worked in Delphi
1 and 2 before re-compiling in Delphi 3.


LIBRARIES

Graphics Math Library (GraphicsMath.PAS)
This unit should be understandable by a person that knows matrix math and
2D/3D geometry.  A standard college-level book on computer graphics can
supply the background on the various 2D/3D transformations.

Graphics Primitives Library (GraphicsPrimitives.PAS)
This unit defines a non-visual TPantograph object used for mapping world
coordinates (Doubles) to a canvas, which can be any canvas:  screen,
printer, or in-memory.  2D/3D vectors can be defined and manipulated.  These
vectors can be scaled, rotated and translated.  A ViewTransformMatrix can be
used to map 3D coordinates to a 2D plane.  A default transformation matrix
can be established (often a View TransformMatrix) so you can work in world
coordinates.  Multiple viewports can be defined on a logical window.
Clipping to each viewport is possible.

Figure Drawing Library (DrawFigures.PAS)
A library shared by the example programs below for drawing spheres, cubes, a
mathematical surface z = f(x,y), and a football field (American).


EXAMPLE PROGRAMS
The first two example programs have not changed much from the past.  The
third and fourth examples are new and show more interactivity.

Example 1 (Football.EXE)
This example shows three perspective views and an orthographic view of the
KSU football field.  You can display these four views on the screen or print
them out.

Example 2 (Spheres.EXE)
This example shows six perspective views and three orthographic views of a
sphere inside a cube.  You can display these views on the screen or print
them out.  A "dynamic" checkbox allows one to view the drawing of each line
segment.

Example 3 (SphereMovie.EXE)
Generate a "movie" (50 frames by default) to show a "fly around" of a sphere
in a cube.  (An alternate interpretation is the camera is fixed and the
sphere moves around.)  These frames are a TList of in-memory bitmaps that
are then displayed as quickly as possible for the animation.  If you
increase the number of frames generated, you can use this program as a
stress test of your real/virtual memory.  Replay the sequence or use a
scroll bar to view the images.  Sometimes playback times are improved by
playing several times.  (I'd appreciate any help in creating an AVI file
from this TList of bitmaps.)

Example 4 (ThreeDLab.EXE)
The "3D Lab".  Choose a figure to display (Cube | Sphere | Cube & Sphere |
f(x,y) Surface | Football field) and then use spinboxes to decide where your
eye is.  Hold down on the spinboxes (assuming you have enough spare
cycles -- it works fine on a 166 MHz Pentium with 32 MB memory) to see the
figure rotate left-or-right or up-or-down, or change the viewing distance.


efg
_________________________________________________

Earl F. Glynn          EarlGlynn@WorldNet.att.net
MedTech Research Corporation
Lenexa, KS  66219  USA