// G-Force DeltaField
// Name: HAL_LDZ-04+131
// Created by: Howard A. Landman, 7 June 2001
// e-mail: howard@polyamory.org -or- howard.landman@vitesse.com
// homepage: http://www.polyamory.org/~howard/

Aspc=0,

// Complex plane version of logistic difference equation.
// srcZ = lambda*z*(1-z)
// = (a + bi)*(x + yi)*((1 - x) - yi)
// = (a*x*(1-x) + a*y*y + b*x*y - b*y*(1-x))
//   + i(b*x*(1-x) + a*y*(1-x) - a*x*y + b*y*y)
//
// Except, we adjust to (1/2 + z)*(1/2 - z) instead to center it
// on the screen
//
// This equation gives fractals which are close cousins of Julia sets.

A0="-0.4",  // a
A1="1.31",  // b
A2="0.9",  // X scaling - smaller A2 => wider fractal
A3="0.6",  // Y scaling - smaller A2 => taller fractal 

// This could be more optimized - no time for this release
srcX="(a0*(0.5+a2*x)*(0.5-a2*x) + a0*sqr(a3*y) + a1*(0.5+a2*x)*a3*y - a1*a3*y*(0.5-a2*x))/a2",
srcY="(a1*(0.5+a2*x)*(0.5-a2*x) + a0*a3*y*(0.5-a2*x) - a0*(0.5+a2*x)*a3*y + a1*sqr(a3*y))/a3",

Vers=100