// G-Force DeltaField
// Name: HAL_Julia-033-006
// Created by: Howard A. Landman, 12 June 2001
// e-mail: howard@polyamory.org -or- howard.landman@vitesse.com
// homepage: http://www.polyamory.org/~howard/

// This DeltaField refracts the waves through the lens of a Julia set,
// the fractal generated by the recursion relation z = z^2 + c
// for z = (x + i*y)
// and c = -0.33 + -0.06i 
//
// See general notes on Julia sets in DF HAL_Julia_Seahorse.

// This particular Julia set is related to a point right on the boundary
// of the Mandelbrot set and is just at the border of chaos with a
// Lyapunov exponent of zero.
// See http://sprott.physics.wisc.edu/chaos/manchaos.htm for more details.

// Fitting Aspc=0 means we fit no matter what the screen aspect ratio
Aspc=0,

// Scale to fit screen
A0="1.11",  // X scaling, smaller A0 => wider fractal
A1="0.84",  // Y scaling, smaller A1 => taller fractal
A2="2*a0*a1", // pre-compute for efficiency

// Normal orientation would be like this
//srcX="(sqr(a0*x) - sqr(a1*y) + 0.33)/a0",
//srcY="(a2*x*y + 0.06)/a1",

// Flip X and Y if aspect ratio is wrong
srcY="(sqr(a1*y) - sqr(a0*x) + 0.33)/a1",
srcX="(a2*x*y + 0.06)/a0",

Vers=100