AnfyPlasma - Copyright (C) by Fabio Ciucci 1996/98


This applet can generate and animate a realtime "plasma" effect, well known
in the "demo scene" contest. This applet is fully parametrized, so you can
generate all kinds of plasma effects.

The transparent image gun.gif is a courtesy of Lone Star Posse Prod. Inc.

The following 3 ".class" files must be uploaded: Plasma3.class, Lware.class
and anfy.class.

Insert the <applet> tag in your html document as follows to add this applet
to your page (Comments after the ";" symbol are code explanations and
acceptable min/max values. They are not part of the applet language):


<applet code="Plasma3.class" width=192 height=192>  ; Name, Width, Height
<param name=credits value="Applet by Fabio Ciucci (www.anfyjava.com)">
<param name=regcode value="NO">         ; Registration code (if you have it)
<param name=reglink value="NO">         ; Optional URL link when the applet
                                          is "clicked'.
<param name=regnewframe value="YES">       ; Reglink opened in new frame?
<param name=regframename value="_blank">    ; Name of new frame for reglink
<param name=statusmsg value="Plasma applet">; Statusbar message
<param name=res value="3">                	; resolution (1-8)
<param name=gen1 value="43">              	; generator1 (8-2000)
<param name=gen2 value="31">              	; generator2 (3-256)
<param name=gen3 value="36">              	; generator3 (3-256)
<param name=red1 value="0">               	; Red1 (0-255)
<param name=red2 value="127">             	; Red2 (0-255)
<param name=red3 value="1">               	; Red3 (1-8)
<param name=green1 value="127">           	; Green1 (0-255)
<param name=green2 value="127">           	; Green2 (0-255)
<param name=green3 value="2">             	; Green3 (1-8)
<param name=blue1 value="127">            	; Blue1 (0-255)
<param name=blue2 value="127">            	; Blue2 (0-255)
<param name=blue3 value="1">              	; Blue3 (1-8)
<param name=speed value="1">              	; Speed (1-8)
<param name=overimg value="NO">                 ; Optional image over applet
<param name=overimgX value="0">                 ; Over image X offset
<param name=overimgY value="0">                 ; Over image Y offset
<param name=memdelay value="1000">        	; Memory deallocation delay
<param name=priority value="3">           	; Task priority (1..10)
<param name=fixnetscape value="NO">       ; Fix Netscape 3.0 bug ("YES","NO")
<param name=MinSYNC value="10">           ; Min. milliseconds/frame for sync
Sorry, your browser doesn't support Java. ; Message for no java browsers.
</applet>                                 ; End of applet tag


                             ---------


The following instructions detail how to change parameters:

Attempting to change the credits parameter will disable the applet.

To activate the reg parameters read the shareware registration notes.
In the "regcode" parameter, place the registration code you
purchased from the author. If the code is correct and the applet is run from
the registered domain name, you can use "link" parameters to link to a URL
when the applet is "clicked".

If you set "regnewframe" to "YES", you can specify a specific frame location
for the reglink:

"_blank"  : To load the link in a new blank unnamed browser window.
"_self"   : To load the link into the same window the applet occupies.
"_parent" : To load the link into the immediate FRAMESET parent.
"_top"    : To load the link into the top body of the window.

You can also set a custom frame name, such as "myframe1".

With the "overimg" parameter you can specify the name of an image that will
be painted over the applet. The best options are transparent GIF images.
NOTE: Animated GIF images are supported, but will be displayed as animated
only on latest browsers (Netscape 4 and Explorer 4 or newer).
With "overimgX" and "overimgY" you can center the image over the applet area.

The size of the applet is determined by the width and height tags.

The "res parameter determine the resolution: with res=1 pixels are small,
but the effect is slow. With res=8 pixels are too big but the effect isfast.
The optimum choices are 2-4.

About the plasma generators: (gen1,gen2,gen3)- I can say that gen1 is a
rather smooth value: the min is 8 (very smooth, like fog), and the max is
2000, where all is psychedelic (too much, I think). Gen2 and Gen3 are x and y
stretchers... they can go from 3 (many small curves) to 256 (one great curve).

About the palette: there are 3 parameters for each Red Green Blue (RGB)
component. This is more complex, but can give you much flexibility (and
also the power to do many bugged palettes).
The red1,green1,blue1 values (0-255) are the multipliers of tonality.
The red2,green2,blue2 values (0-255) are fixed added values of tonality.
The red3,green3,blue3 values (1-8) are "smoothing" values of tonality.
This means that if red1=0, then the green3 value is totally disabled and
all the 256 colors will have the "red2" red component.
You can experiment with these values, but some combinations make ugly
palettes. For those who understand palettes, consider the formula used to
make a palette (r steps from 0 to 255):

      red =  (sin(r*PI*2/(256/red3  ))*red1  )+red2
      green= (sin(r*PI*2/(256/green3))*green1)+green2
      blue = (sin(r*PI*2/(256/blue3 ))*blue1 )+blue2

In any case a component value must exceed 255. Easy, no?

The speed, from 1 to 8, is useful only when you make really large plasmas
that are slow. In this case you can increase this value a bit, but
the plasma will not really be faster: it will simply skip some frames.
This also adds flickerings and loose smoothness (in faster machines).
Please use speed = 1 when possible, and don't exceed speed=4.