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better flashy mandelbrot set

This commit is contained in:
tTh 2022-12-30 02:06:00 +01:00
parent e099b398f3
commit 77ea714b19
2 changed files with 29 additions and 38 deletions
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36
Fraktalism/fraktals.f90
View File

@ -5,6 +5,11 @@ module fraktals
implicit none
contains
!===============================================================
!-
! Enfin un debut de Mandelbrot :)
!-
!===============================================================
! nouveau 28 mai 2022 (again)
! source:
@ -12,18 +17,13 @@ module fraktals
!
subroutine parasites_0(pic, cx, cy, maxiter)
implicit none
! here is the wtf
integer, intent(inout), dimension (:,:) :: pic
real, intent(in) :: cx, cy
integer, intent(in) :: maxiter
integer :: ix, iy, width, height
real :: fx, fy, coef
logical :: burps
! write(0, *) "subroutine parasites_0" , maxiter
! write(0, *) "constantes", cx, cy
width = ubound(pic, 1) ; height = ubound(pic, 2)
coef = float(maxiter) / 12.3456789
@ -33,20 +33,19 @@ subroutine parasites_0(pic, cx, cy, maxiter)
burps = (RAND() .lt. 0.01)
do iy = 1, height
fy = cy + (float(iy) / (float(height)/4.0) - 2.0)
if (burps) then
pic(ix, iy) = mod(int(fx * fy * coef * 1.005), 250)
else
pic(ix, iy) = mod(int(fx * fy * coef), 250)
endif
enddo
enddo
end subroutine parasites_0
!===============================================================
!-
! some problems with color mapping, need more work
!-
subroutine simple_julia(pic, cx, cy, maxiter)
implicit none
integer, intent(inout), dimension (:,:) :: pic
@ -72,22 +71,17 @@ subroutine simple_julia(pic, cx, cy, maxiter)
fx = (float(ix) / (float(width)/4.0) - 2.0)
do iy = 1, height
fy = (float(iy) / (float(height)/4.0) - 2.0)
! ------ traitement du pixel
iter = 0 ; over_iter = .FALSE.
Z = complex(fx, fy)
do while (modulus2(Z) .LT. 4.0)
Z = (Z * Z) + C
iter = iter + 1
if (iter .GE. maxiter) then
over_iter = .TRUE.
exit
endif
end do
if (over_iter) then
pic(ix, iy) = 0
else
@ -98,22 +92,18 @@ subroutine simple_julia(pic, cx, cy, maxiter)
end subroutine simple_julia
!===============================================================
!-
! d'après les pages 91/92 du livre de Roger T Stevens
! "Fractal programming in C"
!
! "Fractal programming in C"
!-
subroutine compute_pickover(array, coefs)
type(t_point3d), dimension(:) :: array
double precision, dimension(4) :: coefs
double precision :: xa, ya, za, xb, yb, zb
integer :: i
! print *, "coefs ", coefs
! write(0, '(1X, A18, I9)') "compute pickover ", ubound(array, 1)
xa = 1.0 ; ya = 1.0 ; za = 1.0
do i=1, ubound(array, 1)
xb = sin(coefs(1)*ya) - za*cos(coefs(2)*xa)
yb = za*sin(coefs(3)*xa) - cos(coefs(4)*ya)
@ -126,7 +116,6 @@ subroutine compute_pickover(array, coefs)
enddo
end subroutine
!-----------------------------------------------------
!
! d'après les pages 91/92 du livre de Roger T Stevens
@ -190,7 +179,8 @@ end subroutine lorentz_0
!===============================================================
! -- some support functions --
!-----------------------------------------------------------
! usage : evolvopick & voxelize
! usage in : evolvopick & voxelize
!-
subroutine interp4dp (ina, inb, out, dpk)
double precision, dimension(4), intent(in) :: ina, inb
double precision, dimension(4), intent(out) :: out

31
Fraktalism/mkmandel.f90
View File

@ -1,5 +1,8 @@
!-----------------------------------------------------
! IMAGE PROCESSING
! MANDELBROT SET
!-
! refactored Thu 29 Dec 2022 03:21:16 PM CET
!-
!-----------------------------------------------------
!-
subroutine plotsomething(pic, start)
@ -14,7 +17,7 @@ subroutine plotsomething(pic, start)
! type (CenterMag), intent(in) :: cz
integer :: ix, iy, width, height
real :: fx, fy, mod2
real :: fx, fy, mod2, rval
complex :: za, zb, cste
integer :: iter, maxiter
logical :: escape
@ -28,7 +31,7 @@ subroutine plotsomething(pic, start)
! initialise constants
!
maxiter = 2500;
maxiter = 1984
! enter megaloop
!
@ -37,8 +40,6 @@ subroutine plotsomething(pic, start)
!! print *, "line ", iy, fy
do ix = 1, width
fx = (float(ix) / float(width/3)) - 2.0
!! print *, "pixel ", ix, iy, " at ", fx, fy
!-------------------------------------
! working on the current pixel
za = start
@ -47,7 +48,6 @@ subroutine plotsomething(pic, start)
escape = .FALSE.
do while (iter .lt. maxiter)
zb = (za * za) + cste
! if (modulus2(zb) .gt. 4.0) then
mod2 = real(zb)*real(zb) + aimag(zb)*aimag(zb)
!! print *, "mod2 ", mod2
if (mod2 .GT. 4.0) then
@ -59,10 +59,11 @@ subroutine plotsomething(pic, start)
!! print *, "ZA ITER ESCAPE", za, iter, escape
enddo
if (escape) then
pic(ix, iy)%r = mod(iter*22, 255)
pic(ix, iy)%b = mod(iter*7, 255)
pic(ix, iy)%r = mod(iter*12, 255)
pic(ix, iy)%b = mod(iter*8, 255)
else
pic(ix, iy)%g = mod(int(mod2 * 555), 200)
rval = (mod2 + abs(real(start)*aimag(start))) * 666.666
pic(ix, iy)%g = mod(int(rval), 180)
! pic(ix, iy)%g = mod(iter, 255)
! pic(ix, iy)%b = mod(iter*11, 255)
endif
@ -95,21 +96,21 @@ program mkmandel
real :: stx, sty
character (len=80) :: filename
print *, "-------- making some mandelbrot -------"
write(0, *) "-------- making some mandelbrot -------"
allocate(pic(800, 600))
allocate(pic(1152, 900))
do angle = 0, 1200
do angle = 0, 1500
call rgbpix_set_to_zero(pic)
radangle = float(angle) * 0.017453292522222
radius = float(angle) / 2000.0
radangle = float(angle) * 0.01664
radius = float(angle) / 1500.0
write (filename, "(a, i5.5, a)") "frames/mandel/", angle, ".pnm"
! filename = trim(filename)
print *, "#### passe ", angle, radangle, trim(filename)
stx = radius * sin(radangle*3.9)
stx = radius * (sin(radangle*3.9) + sin(radangle*5.36))
sty = radius * cos(radangle*3.3)
call plotsomething (pic, complex(stx, sty))