// G-Force DeltaField
// Name: HAL_Julia+074+01533
// Created by: Howard A. Landman, 6 June 2001
// Changed A0 scaling (wasn't working at XGA), 11 October 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 = 0.74 + 0.1533i
//
// See general notes on Julia sets in DF HAL_Julia_Seahorse.

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

// Scale to fit screen
A0="1.5",  // X scaling, smaller A0 => wider fractal
A1="0.92",  // 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) - 0.74)/a0",
srcY="(a2*x*y - 0.1533)/a1",

// Flip X and Y if aspect ratio is wrong
//srcY="(sqr(a1*y) - sqr(a0*x) - 0.74)/a1",
//srcX="(a2*x*y - 0.1533)/a0",

Vers=100