 1  Overview.txt  =TITLE Overview 0 Yadman (Yet Another Damn MANdelbrot program) can2 generate and display images of the Mandelbrot set.2 The Mandelbrot set is produces images of fractals,4 fractional dimensions, that are pleasing to the eye.  2 Fractals are self-similar.  That is, when you zoom2 in on a section, it appears similar, but different2 to the larger view.  Coastlines are fractal, it is3 hard to tell whether you are looking at a few miles $ or a few hundred miles of coastline.  2 Most of the following doesn't matter when you use % the program, just go ahead and enjoy.   3 The Mandelbrot set is a set of points laying on the 1 complex plane.  The complex plane comprises Real  0 numbers in the X dimension and Imaginary numbers0 in the Y dimension (unless I have it backwards).  1 A point is in the Mandelbrot set if you perform a / certain calculation and the result is infinity. 0 Here we approximate the calculation and assign a1 color to each point that represents "how quickly  3 it is fleeing the set".  In other words, the points 0 you see are not in the Mandelbrot set, but close to it.  0 Computing the image can be very time consuming, / as each point must be examined in turn.  Please . keep that in mind when choosing areas to view.  + For more information on the Mandelbrot set, ( please refer to the Computer Recreations- column in the following Scientific Americans:   . August 1985, November 1987, and February 1989.   2 hints  =TITLE Hints. The defaults produce an overview of the entire- Mandelbrot set.  Use the NEW function and the + LAUNCH command to generate new views.  Once . you have an image on the screen you can select/ an area of interest with the mouse (by pressing , the large rectangular button in the NEW box) and LAUNCHing that area.  / An image of 400 pixels with an iteration of 100 , is computable in a reasonable amount of time0 even on a .9 VUP machine.  The larger the number- of pixels and the more iterations, the longer , it can take.  I recommend a DECstation 3100 - to really have fun with this program.  It can . generate an 800 pixel image with 250 colors in only a few minutes.   / You can achieve a wide range of special effects / by playing with the values in the COLOR OPTIONS  box.   2 file   =TITLE File , These are the usual file options, please see, the DECwindows Users Guide for more details.   3 new 
 =TITLE New. Use the NEW option to generate new images. You+ may enter values by hand, or if an image is . already on the screen, use the mouse to select a sub-region to examine.   The parameters are:   ! X (Real)	The horizontal direction   $ Y (Imaginary)	The vertical direction   Length		The distance in the set     Pixels		The size of the image on 		the screen  " Iterations	The number of times the 		algorithm tries before 		giving up on a point  , Iterations effectively defines the number of) colors you will see, up to the maximum of , your display (usually 16 or 256).  Different* iterations may produce radically different. pictures.  You may discover that an apparently2 empty region is filled if you use more iterations.  . If an image is already displayed you may press- the large rectangular button to use the mouse 1 to select an area.  The values will automatically " show up in the the correct fields.  / If you type in a number it does not take effect - until you press APPLY.  Pressing RESET brings  back the previous numbers.  / LAUNCH causes the image to be generated.  It is 0 identical to the LAUNCH under the COMMANDS menu.1 Please see that section of help for more details.    3 open =TITLE Open 1 OPEN is used to read existing files.  A data file 2 may have just the parameters, or the entire image.. If it has the entire image, then the image is 3 displayed.  If it does not, then the window remains - blank and you must press the LAUNCH button to  view the image.    3 save =TITLE Save 0 SAVE allows you to save your image, or just your, parameters.  If the image exists, it will be, saved, otherwise just the parameters will be saved.  	 3 save_as  =TITLE Save As- SAVE_AS allows you to save your image under a  different name.    3 exit =TITLE Exit . EXIT causes the application to finish.  If you- have generated an image and not yet saved it, - you are given the option of saving the image   before you exit.   2 commands   =TITLE Commands 1 The options under the COMMANDS menu cause actions  to take place.   3 launch
 =TITLE Launch . LAUNCH causes the image to be generated.  This- can be very time consuming.  Even a small 400 ( pixel image with 100 iterations can take( more than 10 minutes on a slow machines.% An 800 pixel, 250 iteration image may & take an hour or more.  Of course on a - DECstation 3100, it takes just a few minutes.   4 A generation may be cancelled by pressing the cancel& button that appears during the launch.  1 I find it convenient to examine areas with small  2 sizes and small iterations and then when I find an0 area of interest, generate it at lunch time with) a larger number of pixels and iterations.   	 3 animate  =TITLE Animate1 ANIMATE manipulates the color map to cause visual 5 effects approximating those seen daily by inhabitants  of the west coast.   3 brain_fade =TITLE Brain Fade 0 BRAIN FADE is another animation sequence.  It is3 sometime hard to differentiate between this command , and simply 20 hours of non-stop programming.  	 2 options  =TITLE Options/ OPTIONS gives you the ability to manipulate the  image on the screen.   3 colors
 =TITLE Colors 1 The COLORS option gives you the ability to create 1 many dazzling visual effectives.  By changing the 2 values of the three numbers you effect how numbers are stored in the color map.    2 You may type numbers directly, or use the icons to0 move them up and down by the selected increment.1 Numbers that you type in do not become effective  # until you press the APPLY button.     6 Pressing RESET allows brings back the default numbers.  7 You may choose between SHIFT and MULTIPLY for different 4 effects.  The former shifts the color map entries by4 the shown factor, and the later multiplies them.  If4 you really care how it's done, read the source code.   Otherwise, just enjoy.  
 3 auto_resize  =TITLE Auto Resize+ Selecting AUTO RESIZE causes the window to  0 automatically assume the same size as the image.  - Selecting NO AUTO RESIZE causes the window to 2 stay the same size and allows you to scroll around
 the image.  - You may also resize the window at any time by , using the standard DECwindows resize button.. Please refer to the DECwindows Users Guide for
 more details.          