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Mandel
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Mandel.doc
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1988-01-23
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* ---------------------------------------------------------------:ts=8----
* M A N D E L . D O C As of 15 Sep 1987
* ------------------------------------------------------------------------
*
* This document describes some of the many features of the
* Mandelbrot generation program, as written by
*
* Olaf Seibert, KosmoSoft
* Beek 5
* 5815 CS Merselo
* The Netherlands
*
* ------------------------------------------------------------------------
Hi!
I assume that you are familiar with the operation of the Amiga with respect
to windows, gadgets, screens and all other Intuition features. Therefore,
I will NOT list everything in menu-order. Rather, I will only make some
comments at some (most) of them.
When Mandel starts up, it opens a screen of the same size as your current
Workbench screen, but in lo-res with 5 planes.
NOTE: There seems to be a graphics bug when I try to open a hires screen
with a size of 672x266 (x4) pixels. The part below about line 213
is not displayed in many cases. Lores screens don't have this bug
(It's gotta be Dale's :-)
MOUSE NOTES
-----------
With the mouse, you can select a rectangular part of the picture that you
may later enlarge or reduce.
To start selecting, you click the mouse in the inner part of the window.
Then you can click two opposite corners of the desired rectangle.
You may also double-click to select a middle point of the rectangle. Then
you only have to select one corner.
If you dislike the resulting flashing frame, you can remove it by clicking
in the sizing gadget. The area you selected in the picture will remain valid
until you begin reselecting or change the coordinates of the entire picture.
PROJECT NEW
------- ---
With this submenu you can create new pictures. They will always fill your
window, even if the ratio of width and height is ridiculous.
The RATIO number that appears in the coordinates requester should be about
1.00. If it is much more or less than this, your picture will be not
representative of the Mandelbrot set. If it is, for example, 2.00, this
means that the height of the current window is twice the size it normally
should be.
This number is updated each time you press return in one of the string
gadgets. You may have resized the window in the meantime.
With ENLARGE you can enlarge a part of the current picture as you indicated
with the mouse.
With REDUCE you can reduce the current picture to an area as large as the
area you indicated, which is located at that place. This is useful to
see some of the surroundings of the current picture.
The SHIFT subitem is somewhat special. A value of 0.5 means that the new
range you want to see is shifted 0.5 of the size of the current range.
OPEN
----
You can read any FORM ILBM picture into Mandel. This is most useful if it is
indeed a picture generated by Mandel. The pictures can be of any size,
and will be clipped to the current window as appropriate. If it is too small,
the part of the window that is not covered is not changed.
SAVE
----
If you have saved the current picture before, you can save it again.
That is also possible if you only changed the current picture, that is,
used FILL IN.
SAVE AS
-------
Together with the picture, some important information is saved, such as
the area of the Mandelbrot set that is contained in the picture, and
the rainbow color palette.
Currently, the _screen_ is simply dumped into the file, so you'd better move
up the window up as much as possible and _remove the border_. Also, the
saved coordinate information will only be correct if you save your pictures
this way.
During a save, the drawing of a picture is suspended, to prevent creating
corrupt IFF files.
OPTIONS COLORS
------- ------
With this submenu, you can play with the colors and the coloration of
pictures.
SELECT
------
is not implemented. It should be a way to individually select the
pen number used for each iteration count.
MODULO
-----
means that the pen color used for a pixel is calculated by taking the
iteration count MOD the number of available colors.
RANGES
------
is a slightly modified version of modulo. The range width is user-select-
able. This is the number of consecutive iteration counts that produce
the same pen number. If you set this to 1 you get excactly the effect
you get with modulo.
PALETTE
-------
A real color palette, that you may recognise from the Intuition reference
Manual and Thomas Wilcox's and =RJ= Mical's mandelbrot program. I have
extended it somewhat, and put a hidden gadget to work. Try hitting the RGB!
You then meet the RAINBOW MODE. Almost everything in the palette changes
its function. Try and have fun!
OPTIONS RESOLUTION
------- ----------
This submenu enables you to change two types of resolution: the screen
resolution, and the drawing resolution.
If you select 1/2...1/4, you may use Fill In to fill in the missing pixels.
Borderless is another Special Feature of Mandel: it can make the window
borderless to gain some extra pixels for your picure. While you can't see
them, all the normal window gadgets are still functional in the same way
they were before. So to start selecting a window frame, you must still
click in the inner part of the window.
For borderless, the picture will be preserved.
When you change display resolution, your current picture will be lost.
However, the size and location of your WINDOW will be preserved as well
as possible. Note this can't be done correctly in all cases.
PARAMETERS
----------
This puts up a requester to change some parameters of the program.
Currently these are the range width used for 'ranges' and the maximum
iteration count for every pixel.
It may not be wise to alter parameters while a picure is being drawn.
FUNCTIONS
---------
This is not a very much-used menu. Here you can select what function is
used while iterating complex values. Only the first function is 'real',
(ie it is Mandelbrot's function), the others are less interesting and
also slower. You may try them, however, if you like.