Fortraneries/Fraktalism/fraktals.f90

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module fraktals
implicit none
contains
!-----------------------------------------------------
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subroutine simple_julia(pic, cx, cy, maxiter)
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implicit none
integer, intent(inout), dimension (:,:) :: pic
real, intent(in) :: cx, cy
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integer, intent(in) :: maxiter
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integer :: ix, iy, width, height
real :: fx, fy
complex :: Z, C
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integer :: iter
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logical :: over_iter
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width = ubound(pic, 1)
height = ubound(pic, 2)
C = complex(cx, cy)
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print *, "Const = ", C
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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
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iter = 0 ; over_iter = .FALSE.
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Z = complex(fx, fy)
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do while (modulus2(Z) .LT. 4.0)
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Z = (Z * Z) + C
iter = iter + 1
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if (iter .GE. maxiter) then
over_iter = .TRUE.
exit
endif
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end do
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if (over_iter) then
pic(ix, iy) = 0
else
pic(ix, iy) = iter
endif
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enddo
enddo
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end subroutine simple_julia
!-----------------------------------------------------
!
!
!
subroutine pickover_0(pic, count)
implicit none
integer, intent(inout), dimension (:,:) :: pic
integer, intent(in) :: count
double precision :: xa, ya, za, xb, yb, zb
double precision :: ka, kb, kc, kd
integer :: i, px, py
ka = 2.24 ; kb = 0.43 ; kc = -0.65 ; kd = -2.43
xa = 0.00 ; ya = 0.00 ; za = 0.0
do i=1, count
xb = sin(ka*ya) - za*cos(kb*xa)
yb = za*sin(kc*xa) - cos(kd*ya)
zb = sin(xa)
print *, i, xb, yb, zb
xa = xb ; ya = yb ; za = zb
enddo
end subroutine pickover_0
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!-----------------------------------------------------
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! -- some support functions --
!-----------------------------------------------------
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function dist0 (x, y)
implicit none
real, intent(in) :: x, y
real :: dist0
dist0 = ( x*x + y*y )
end function
!-----------------------------------------------------
function modulus2(pt)
implicit none
complex, intent(in) :: pt
real :: modulus2
modulus2 = real(pt)*real(pt) + imag(pt)*imag(pt)
end
!-----------------------------------------------------
end module fraktals