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 Readme for:  Graphics » Screenblanker » ifs-blanker.lha

Ifs-blanker

Description: IFS Screen Blanker Module
Download: ifs-blanker.lha       (TIPS: Use the right click menu if your browser takes you back here all the time)
Size: 1Mb
Version: 1
Date: 18 Dec 12
Author: tekmage
Submitter: tekmage
Requirements: OS 4.1
Category: graphics/screenblanker
License: Other
Distribute: yes
Min OS Version: 4.0
FileID: 7573
 
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IFS.blanker

Description: This represents a port of a clone.  The original work was "Fire"
for "xlock" for Unix X windows systems.  This work is a port of the "IFS"
blanker from the AgBlankers by Karlheinz Agsteiner for the Gblanker system. 
Kerlheinz was kind enough to provide the source to his work which I used in
addition to source code from Rene Olsen and Alex Carmona.  
IFS is known as the "Scrawls of God"

More details on the Interated fuction system:
http://en.wikipedia.org/wiki/Iterated_function_system

Original Source code location:
http://aminet.net/util/blank/AgBlankers1.1.lha

Rene's excellent examples:
http://www.rwo.dk/dl.html

Installation:

Copy the IFS.blanker and IFS.blanker.info to sys:utilities/blankers

Usage:

The module offers several options available via the Module Preferences:

*From the original blanker docs*
The iterated function systems produced by IFS can be controlled by
several parameters adjustable in the Prefs window:

  * Functions   - Sets the maximum number of random transformation 
                  functions that are used to compute the figures.
                  The larger this number is the more sophisticated
                  figures can be drawn. However, even 3 random
                  functions provide a broad range of different
                  figures while large systems with 8 or more
                  functions often tend to result in clouds.
                  I'd suggest a value of about 4 to 6.
  * Iterations  - Controls how long IFS computes one figure. Each
  	  iteration performs a computation sequence of
  	  about 100 points. Default is 300 iterations.
  	  Of course, large cloudlike structures are
  	  given a longer calculation time as small
  	  figures do.
  * Area        - Can be either special or uniformal.
  	  Uniformally drawn figures look a bit more
  	  structured in some cases but wastes much time.
  	  Generally, special is far better.
	  ***Uniform works much better then special, could be a bug.
  * Transpose   - If set to "no", the center of each figure is
  	  set exactly in the middle of the picture. "Yes"
  	  will cause each IFS being displayed with some
  	  offset from this center.
  * ContProb    - The probability to paint the next ifs without
  	  clearing the screen first (in percent).
  * Decrease    - The number of percents substracted from ContProb
  	  after each drawing.
  	  Example: ContProb = 120%, Decrease = 20% will
  	  clear the screen after a drawing with the following
  	  probabilities:
  	  
  	    0  120% = always   	    1  100% = always   	    2   80% = 8 out of 10   	
   3   60% = 6 out of 10   	    4   40% = 4 out of 10   	    5   20% = 2 out of
10   	    6    0% = never   	    
  	  Thus the setting 120/20 means "draw at least two   	  figures and at most
6".
  * Display     - Like the other blankers. IFS paints each figure
  	  in the same color so 8 colors should suffice for
  	  the most cases (except for very large ContProbs).


History:
1.0:  Initial Release for AmigaOS 4.1 by Bill Borsari

Credits:

Rene Olson for the blanker examples
Alex Carmona for assistance
Andy Broad for assistance
Paul Sadlik for beta testing
Karlheinz Agsteiner for the original Amiga port 



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