98 lines
2.9 KiB
Fortran
98 lines
2.9 KiB
Fortran
module julias
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implicit none
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contains
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!===============================================================
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!-
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! some problems with color mapping, need more work
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!-
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subroutine simple_julia(pic, cx, cy, maxiter)
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implicit none
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integer, intent(inout), dimension (:,:) :: pic
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real, intent(in) :: cx, cy
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integer, intent(in) :: maxiter
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integer :: ix, iy, width, height
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real :: fx, fy
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complex :: Z, C
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integer :: iter
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logical :: over_iter
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width = ubound(pic, 1)
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height = ubound(pic, 2)
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C = complex(cx, cy)
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print *, "Const = ", C
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! ready ? ok, clear the picture
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pic = 0
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do ix = 1, width
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fx = (float(ix) / (float(width)/4.0) - 2.0)
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do iy = 1, height
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fy = (float(iy) / (float(height)/4.0) - 2.0)
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! ------ 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 (real(Z)*real(Z) + imag(Z)*imag(Z) .LT. 4.0)
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Z = (Z * Z) + C
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iter = iter + 1
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if (iter .GE. maxiter) then
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over_iter = .TRUE.
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exit
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endif
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end do
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if (over_iter) then
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pic(ix, iy) = 0
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else
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pic(ix, iy) = iter*12
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endif
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enddo ! iy
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enddo ! ix
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end subroutine simple_julia
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!===============================================================
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subroutine julia_colormapped(pic, cx, cy, maxiter)
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use pixrgb
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type(t_pixrgb), intent(inout), dimension (:,:) :: pic
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real, intent(in) :: cx, cy
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integer, intent(in) :: maxiter
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integer :: ix, iy, width, height
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real :: fx, fy
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complex :: Z, C
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integer :: iter
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logical :: over_iter
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width = ubound(pic, 1)
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height = ubound(pic, 2)
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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)/4.0) - 1.0)
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do iy = 1, height
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fy = (float(iy) / (float(height*2)/4.0) - 1.0)
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! ------ 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 ((real(Z)*real(Z) + imag(Z)*imag(Z)) .LT. 4.0)
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Z = (Z * Z) + C
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iter = iter + 1
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if (iter .GE. maxiter) then
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over_iter = .TRUE.
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exit
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endif
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end do
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if (over_iter) then
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pic(ix, iy)%r = 0
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pic(ix, iy)%g = mod(abs(int(real(Z) *140)), 255)
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pic(ix, iy)%b = mod(abs(int(aimag(Z)*140)), 255)
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else
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pic(ix, iy)%r = mod(iter*33, 255)
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pic(ix, iy)%g = mod(iter*29, 255)
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pic(ix, iy)%b = mod(iter*21, 255)
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endif
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enddo ! iy
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enddo ! ix
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end subroutine
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!===============================================================
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end module
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