>> DIESE SEITE AUF DEUTSCH << All software on this page is free. The
copyright holder is Thomas Haenselmann
particle simulation (32-bit Windows or Linux)
In the window of ParticleSimulation.exe you can spray an amount
of particles into the air. The number of simulated particles is
only limited by the speed of your PC. Even on my former Pentium
II about 6000 particles could be simulated at a time in a smooth
fashion. In the current version the particles don't interact
with eachother however they will bounce back from the ground and
they accelerate depending on a gravity constant. This constant can be
changed along with a number or other parameters in a dialog box.
You can download a ziped executable of the program ready to run
or the source code. Note that you have to use MS Visual Studio
in order to compile the application yourself.
with dialog box
|Fast command line
version (start from dos prompt/not dos mode!)
There was quit a bit of
feedback on the particle simulation so I ported it to Linux
using the SDL library (Simple Direct Media Layer). The Linux version can handle more
particles than the Windows version. Unlike the first Windows
Version is doesn't include a dialog box. Use command line
options to control it and see "particles -h" to learn about the
August 27th, 2002:
New Windows WinParticles-Pro
Version. The Linux SDL version was ported back to Windows. Now a
significantly increased number of particles can also be
simulated on Windows but there is no more dialog box. So
winparticles.exe has to be started from the DOS prompt.
August 25th, 2002:
The new animation mode was
added. Now you can capture your moves in a textfile and play
them back. Try option -y demo_movie.txt and enjoy the show :)
The works only for the Linux version and WinParticles-Pro.
August 19th, 2002:
Dual processor option was
added to simulate up to 100k particles on a dual Xeon 2.2 GHz
(do not use it on single CPU systems since it slows them down).
Source should compile better on most systems. Bugfix of well
known segmentation fault.
August 10th, 2002:
Joe Thornber provided a
patch that causes the emission to be circular which looks really
cool. Thanks Joe.
(small extract of a screenshot)
Send me an e-mail with a
file for playback using the -c option
|ppm2html is a
small linux tool that converts an RGB ppm image into a html page. The
page will display an approximated version of the image only using ASCII
characters and color definitions.
If a 'source string' is being defined this string will repeatedly be
used as character source for rendering the ASCII output. If omitted
random characters between 'a' and 'z' will be used. The 'red', 'green',
'blue' values define the backgroundcolor of the html page. If no
commandline arguments are given the page is rendered black.
Best results will be obtained if segmented objects are converted (which
means that the background of the image is replaced by a single color).
Also the level of detail should be kept low. A small blur on the image
(e. g. a gaussian filter) can result in a nicer visual appearance,
especially when displaying text.
Note than the output differs among different kinds of browsers. In
particular the horizontal scaling might differ a lot. Best results will
probably be achieved using unique renderings for each kind of browser.
ppm2html image.ppm [source_string] [red green blue] > output.html
image in ppm format
used for rendering html page
for random characters from ['a','z'])
background color (omit for black)
ppm2html.zip executable (25 kB)
Source Code source code (65 kB)
(example rendered by ppm2html)
of life (Windows 98)
|Game of Life
was an idea described in the journal Scientific America
by a mathematician John H. Conway in 1970. It's a small
simulation of a cell population. Game of Life has no serious
biological foundation. Cells live on a chessboard-like grid.
Only up to one cell can live in a single space. Initially some
cells must be scattered round the place. Cells will be born or
will die according to the following simple rules:
If a space is populated
||Each cell with
less than two neighbours dies since it feels too lonely
||Each cell with
more than three neighbours dies because the area is
If a space is empty
||A new cell is
born if it has exactly three neighbours
Even though these roules are so simple they produce a vividly
floating population of dying and newly born cells. Sometimes
based on an initial state populations can grow unexpectedly.
After many iterations some cell configurations remain stable and
there are even so called 'walkers' that constantly move into one
direction simply by dying and being born.
The idea of Game of Life is well known in computer science but
since I discovered it very late and found it so appealing I had
to code it myself. After starting the program you can set cells
with the left mouse button and start or stop Life with the right
one. Enjoy the download below.
GameOfLife.zip (64 kB)
Source Code as Visual Studio Project (33 kB)
(screenshot from GameOfLife)
- OpenPictureSpace (Linux)
|ops is an
image viewer for linux based on the SDL library. Using ops you
can scan your directories for images. A fullscreen thumbnail
image is then displayed that can be scrolled using the cursor
keys. Clicking a small image displays it in its original size.
Further clicks enlarges the image even further.
Other image viewers build a n x m grid with thumbnails. In
contrast ops scales images only vertically and places as many
images into a line as possible. So the screen space is optimized
for a maximum number of thumbnails.
ops knows to following options:
quality (n=0: low/fast (default), ..., n=5: hight/slow)
thumbnail in pixels (n=12, ..., 255)
(n=0: quiet / n=1: verbos / n=2: debug)
||n=0: quiet /
n=1: verbos / n=2: debug (quite a lot)
resolution n=0: 640x480 / n=1: 800x600 / n=2: 1024x768
n=3: 1280x1024 / n=4: 1600x1200
example: ops ~/ -r -q5 (display all images in your home directory tree
with best quality)
ops.zip Linux executable statically linked (763 kB)
Source Code source code - needs SDL + SDL_image devel.
version (8 kB)
Please note that the latest version of
ops is maintained by Marc
Le Douarain. It includes some additional features like added
filenames and a better background processing for large directories. I
didn't yet check his add-ons for security issues so there are no
guarantees from my side but his attempts to improve the application
seem to be trustable.
(screenshot from ops)