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UF中又一种奇怪的M集构造，还看不出到底有什么意义：
sft_Dizzy1Mandy {
; Setemkia FallingTree, a.k.a Fawn/Kia
; 16 June 2002
init:
complex z0 = @start
complex r0 = sqrt(|z0|)+flip(atan2(z0))
complex z1 = 0
complex r1 = 0
float ss = @step*#magn^(-5/12)
float ang = 0
int iter = 0
#z = #pixel
loop:
z1 = z0
r1 = r0
z0 = z0^@m+#pixel
ang = atan2(z0) , if (ang < 0) , ang = 2*#pi+ang , endif
r0 = sqrt(|z0|)+flip(ang)
if @weighted==false
ang = (imag(r0)+imag(r1))/2
else
ang = (real(r0)*imag(r0)+real(r1)*imag(r1))/(real(r0)+real(r1))
endif
if @addsub==1, ang = -ang, endif
#z = #z + ss*#e^flip(atan2(z0-z1)+ang)
iter = iter+1
bailout:
iter < #maxiter
default:
title = "Dizzy #1 Mandy"
center = (0,0)
magn = 1.5
maxiter = 19
method = onepass
periodicity = 0
param start
caption = "Starting point"
default = (0,0)
hint = "Mandelbrot perturbation. Standard Mandy uses (0,0)."
endparam
param m
caption = "Mandy power"
default = 2.0
hint = "Power of the Mandelbrot set. Standard Mandy uses 2.0."
endparam
param step
caption = "Step size"
default = 0.25
min = 1.0e-12
hint = "On each iteration a step of this length is made in a chaotic \
direction. Actually, the step length is scalled by the \
current magnification."
endparam
param addsub
caption = "Delta Angle Usage"
enum = "Add" "Subtract"
default = 1
hint = "Specify whether to add or subtract the change in direction."
endparam
param weighted
caption = "Weighted Average"
default = false
hint = "Use weighted average in computing change of direction."
endparam
} |
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