Fortraneries/Fraktalism/julias.f90

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module julias
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implicit none
contains
!===============================================================
!-
! some problems with color mapping, need more work
!-
subroutine simple_julia(pic, cx, cy, maxiter)
implicit none
integer, intent(inout), dimension (:,:) :: pic
real, intent(in) :: cx, cy
integer, intent(in) :: maxiter
integer :: ix, iy, width, height
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real :: fx, fy
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complex :: Z, C
integer :: iter
logical :: over_iter
width = ubound(pic, 1)
height = ubound(pic, 2)
C = complex(cx, cy)
print *, "Const = ", C
! ready ? ok, clear the picture
pic = 0
do ix = 1, width
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 (real(Z)*real(Z) + imag(Z)*imag(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
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pic(ix, iy) = mod(iter*13, 256)
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endif
enddo ! iy
enddo ! ix
end subroutine simple_julia
!===============================================================
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subroutine julia_colormapped(pic, cx, cy, maxiter)
use pixrgb
type(t_pixrgb), intent(inout), dimension (:,:) :: pic
real, intent(in) :: cx, cy
integer, intent(in) :: maxiter
integer :: ix, iy, width, height
real :: fx, fy
complex :: Z, C
integer :: iter
logical :: over_iter
width = ubound(pic, 1)
height = ubound(pic, 2)
C = complex(cx, cy)
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! print *, "Color julia, const = ", C
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do ix = 1, width
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fx = (float(ix) / (float(width*2)/10.0) - 2.5)
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do iy = 1, height
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fy = (float(iy) / (float(height*2)/10.0) - 2.5)
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! ------ traitement du pixel
iter = 0 ; over_iter = .FALSE.
Z = complex(fx, fy)
do while ((real(Z)*real(Z) + imag(Z)*imag(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)%r = 0
pic(ix, iy)%g = mod(abs(int(real(Z) *140)), 255)
pic(ix, iy)%b = mod(abs(int(aimag(Z)*140)), 255)
else
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pic(ix, iy)%r = mod(iter*22, 255)
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pic(ix, iy)%g = mod(iter*59, 255)
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pic(ix, iy)%b = mod(iter*21, 255)
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endif
enddo ! iy
enddo ! ix
end subroutine
!===============================================================
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end module