JULIA SETS (Graphic Trick)

[vexd]

%|------------------------------------------------------->
%|Author: VeXD
%|Date: Sept, 30 2003
%|Purpose: To make a program that will draw a julia set fractal image.
%|Input: User will input numbers. 2 Reals and 1 Integer.
%|Output: This program will output the julia set image
%|------------------------------------------------------->

var p : real
var q : real
var rx : real
var rx2 : real
var ry : real
var ry2 : real
var rlMath : real
var win : int
var intMaxCount : int
var intCount : int := 0
var intColor : int := 0

put "Please enter the first value: " ..
get p
put "Please enter the second value: " ..
get q

put "Please enter a value for maxcount: " ..
loop
get intMaxCount
exit when intMaxCount >= 20 and intMaxCount <= 200
put "Invalid value for MaxCount, MaxCount must be between 20-200"
end loop

win := Window.Open ("graphics, nocursor")

for x : 0 .. maxx
for y : 0 .. maxy
rx := 3.5 / maxx * x - 1.75
ry := 3.5 / maxy * y - 1.75
intCount := 0
loop
rx2 := rx * rx - ry * ry + p
ry2 := 2 * rx * ry + q
rx := rx2
ry := ry2
rlMath := rx * rx + ry * ry
intCount := intCount + 1
exit when intCount = intMaxCount or rlMath > 4
end loop
if intCount < intMaxCount then
intColor := intCount + Rand.Int (55, 60) %For Amusement Purposes Only.
else
intColor := 0
end if
Draw.Dot (x, y, intColor)
end for
end for