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改一下代码，结果是一样的：
mt-attractor-julia {
; Mark Townsend, 29 Mar 1999
;
; Julia sets that bail out when the orbit reaches
; (hopefully) a periodic attractor. I iterate the
; critical point z = (0,0) before the main loop
; and test against the resulting value. In the
; hope of speeding the process up I include
; the option to give up the search when z
; grows too large.
;
init:
w = @c
z = #pixel
loop:
z = z^2 + @c
bailout:
|w - z| > @epsilon && |z| < @bailout
default:
title = "Attractor Julia"
maxiter = 1000
periodicity = 0
param c
caption = "Julia seed"
default = (-0.12,0.74)
endparam
param epsilon
caption = "Epsilon"
default = 1e-6
hint = "This is the bailout value for convergent orbits."
endparam
param bailout
caption = "Bailout value"
default = 100.0
hint = "This is the bailout value for divergent orbits."
endparam
param max
caption = "Search maxiter"
default = 100
hint = "The is the maxiter value for the attractor \
search."
endparam
param no_bail
caption = "Every pixel"
default = false
hint = "This determines whether to bailout of the attractor \
search when z grows too large. Enable this when the \
image is mainly inside."
endparam
switch:
type = "mt-attractor-m"
max = max
epsilon = epsilon
bailout = bailout
no_bail = no_bail
} |
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