68 lines
1.5 KiB
Fortran
68 lines
1.5 KiB
Fortran
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program henon
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implicit none
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integer :: passe
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double precision :: vx, vy
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integer :: w, h
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integer :: foo, bar
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double precision :: px, py
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w = 2000 ; h=1600
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write(0, *) "###### Mapping of Henon "
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do foo=1, 16
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px = dble(foo) / 16.0
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do bar=1,16
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py = dble(bar) / 16.0
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call compute_pixel_henon(px, py, 1700, &
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passe, dble(0.5), vx, vy)
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write(0, fmt=*) "passe ", passe, vx, vy
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enddo
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end do
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!-----------------------------------------------------
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contains
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!-----------------------------------------------------
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!-----------------------------------------------------
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subroutine compute_pixel_henon(a, b, maxpasse, passe, limit, rx, ry)
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implicit none
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double precision, intent(in) :: a, b, limit
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integer, intent(in) :: maxpasse
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integer, intent(out) :: passe
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double precision, intent(out) :: rx, ry
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double precision :: x, y, x2, y2
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write(0, fmt="('compute pixel:', (2F8.3, I6, F8.3))") &
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a, b, maxpasse, limit
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x = 0.0
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y = 0.0
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do passe=1, maxpasse
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x2 = 1d0 + y - (a * x * x)
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y2 = b * x
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x = x2
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y = y2
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write(0, fmt="(i4, 2F8.3)") passe, x, y
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if (x .lt. -limit) exit
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if (x .gt. limit) exit
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if (y .lt. -limit) exit
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if (y .gt. limit) exit
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enddo
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rx = x
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ry = y
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end subroutine
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!-----------------------------------------------------
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end program
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