126 lines
3.6 KiB
Fortran
126 lines
3.6 KiB
Fortran
!-----------------------------------------------------
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! MANDELBROT SET
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!-
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! refactored Thu 29 Dec 2022 03:21:16 PM CET
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!-
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!-----------------------------------------------------
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!-
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subroutine plotsomething(pic, start)
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! use cmplxmath
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! use imagetools
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use pixrgb
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implicit none
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type(t_pixrgb), intent(inout), dimension (:,:) :: pic
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complex, intent(in) :: start
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! type (CenterMag), intent(in) :: cz
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integer :: ix, iy, width, height
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real :: fx, fy, mod2, rval
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complex :: za, zb, cste
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integer :: iter, maxiter
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logical :: escape
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print *, "> plotsomething"
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width = ubound(pic, 1)
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height = ubound(pic, 2)
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! print *, " pic size ", width, height
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print *, " start ", start
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! initialise constants
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!
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maxiter = 1984
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! enter megaloop
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!
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do iy = 1, height
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fy = (float(iy) / float(height/3)) - 1.5
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!! print *, "line ", iy, fy
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do ix = 1, width
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fx = (float(ix) / float(width/3)) - 2.0
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!-------------------------------------
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! working on the current pixel
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za = start
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cste = complex ( fx, fy )
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iter = 0
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escape = .FALSE.
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do while (iter .lt. maxiter)
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zb = (za * za) + cste
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mod2 = real(zb)*real(zb) + aimag(zb)*aimag(zb)
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!! print *, "mod2 ", mod2
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if (mod2 .GT. 4.0) then
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escape = .TRUE.
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exit
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endif
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za = zb
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iter = iter + 1
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!! print *, "ZA ITER ESCAPE", za, iter, escape
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enddo
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if (escape) then
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pic(ix, iy)%r = mod(iter*12, 255)
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pic(ix, iy)%b = mod(iter*8, 255)
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else
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rval = (mod2 + abs(real(start)*aimag(start))) * 666.666
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pic(ix, iy)%g = mod(int(rval), 180)
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! pic(ix, iy)%g = mod(iter, 255)
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! pic(ix, iy)%b = mod(iter*11, 255)
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endif
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!-------------------------------------
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end do ! fin boucle sur X
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end do
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end
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!-----------------------------------------------------
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!
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! this is the main programm
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!
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program mkmandel
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use pixrgb
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implicit none
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interface
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subroutine plotsomething (pic, start)
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use pixrgb
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type(t_pixrgb), intent(inout), dimension (:,:) :: pic
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complex, intent(in) :: start
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end subroutine plotsomething
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end interface
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type(t_pixrgb), allocatable :: pic(:,:)
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integer :: angle
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real :: radangle, radius
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real :: stx, sty
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character (len=80) :: filename
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write(0, *) "-------- making some mandelbrot -------"
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allocate(pic(1152, 900))
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do angle = 0, 1500
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call rgbpix_set_to_zero(pic)
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radangle = float(angle) * 0.01664
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radius = float(angle) / 1500.0
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write (filename, "(a, i5.5, a)") "frames/mandel/", angle, ".pnm"
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! filename = trim(filename)
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print *, "#### passe ", angle, radangle, trim(filename)
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stx = radius * (sin(radangle*3.9) + sin(radangle*5.36))
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sty = radius * cos(radangle*3.3)
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call plotsomething (pic, complex(stx, sty))
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call rgbpix_spit_as_pnm_8 (pic, trim(filename))
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print *
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enddo
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print *, " [DONE]"
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end
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!-----------------------------------------------------
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