f_UlamSpiral

UlamSpiral

Usage

 Creates an Ulam spiral graphic
 -p                           Color pixel if prime (true if -f not specified)
 -f                           Color pixel based on number of divisors; dot size is proportional to divisor count
 -6m                          Color primes depending on if they are 6*m+1 or 6*m-1
 -c (x,y)                     Center x,y coordinate (default 0,0)
 -m (Mapping)                 Mapping used to translate x,y into an index number (default spiral)
 -s (number)                  Spacing between points (default 1)
 -ds (number)                 Maximum dot size in pixels; decimals allowed (default 1.0)
 -dt (Dot)                    Dot used for drawing (default circle)
 -c(1,2,3,4) (color)          Colors to be used depending on mode. (setting any of the colors is optional)

 Color Mappings:
 default                      c1=background  c2=primes
 -f                           c1=background  c2=primes  c3=composites
 -6m                          c1=background  c2=6m-1    c3=composites  c4=6m+1

 Available Mappings:
 1. Linear                    Linear mapping left to right, top to bottom
 2. Diagonal                  Diagonal winding from top left
 3. Spiral                    Spiral mapping inside to outside

 Available Dot Types:
 1. Blob                      Draws a spherical fading dot
 2. Circle                    Draws a regular circle
 3. Square                    Draws a regular square

Examples

	Images
Default
-c1 white -c2 black
-m 1
-m 2
-6m
-f
-f -s 2 -ds 20.0