150 lines
3.6 KiB
FortranFixed
150 lines
3.6 KiB
FortranFixed
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c----------------------------------------------------------------
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c *****************************************
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c * THIS FILE IS ARCHIVED FOR HISTORY *
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c * DON'T TRY TO USE IT AT HOME *
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c *****************************************
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c----------------------------------------------------------------
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c mapping of the Henon Diagram
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c a escape time fractal from 'Oulala Software'
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c http://www.chez.com/oulala/g77/map_henon.html
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c
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c----------------------------------------------------------------
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program map_henon
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c
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c control the image dimension
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c
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integer w, h
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parameter (w=2000, h=1600)
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c maximum number of iterations by pixel
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c around 5000 seems a good value
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c
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integer maxpasse
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parameter (maxpasse=17000)
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double precision amp, limite
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parameter (amp=1.42d0, limite=4.0d9)
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c control the position of the view window
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c
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double precision a, b
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parameter (a=0.65d0, b=0.15d0)
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integer x, y, image, passe
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integer masque, flag
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integer valr, valg, valb
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integer in, out
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double precision dx, dy, rx, ry
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double precision minrx, minry, maxrx, maxry
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real temps
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integer IMG_CREATE
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c ---------------------------------------------------------
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image = IMG_CREATE(w, h, 3)
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masque = IMG_CREATE(w, h, 3)
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in = 0
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out = 0
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minrx = -9d99
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minry = -9d99
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maxrx = 9d99
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maxry = 9d99
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do 5 x=0, w-1
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dx = (a-amp) + (amp*2/(w-1)*x)
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do 4 y=0, h-1
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dy = (b-amp) + (amp*2/(h-1)*y)
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call henon(dx, dy, maxpasse, passe, limite, rx, ry)
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if (passe .gt. maxpasse) then
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in = in + 1
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valr = 128
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valg = abs(int(rx*1d2))
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valb = abs(int(ry*1d2))
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flag = 0
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else
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out = out + 1
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if (passe .le. 2) then
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valr = 0
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valg = 80 * passe
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valb = 10
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flag = 255
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else
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valg = (passe*255)/maxpasse
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valr = mod(passe,255)
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valb = (255-((passe*255)/maxpasse))/3
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flag = 128
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endif
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endif
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C write(6,101) x, y, dx, dy, passe, valr, valg, valb, rx, ry
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call IMG_PLOT(image, x, y, valr, valg, valb)
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call IMG_PLOT(masque, x, y, flag, flag, flag)
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4 continue
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write(6,107) x, w, in, out
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5 continue
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c
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c Here, you can change the name of the saved TGA file.
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c Just modify the second parameter...
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c
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call IMG_TGA_SA(image, "map_henon.tga", 0)
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call IMG_TGA_SA(masque, "msq_henon.tga", 0)
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temps = second() / 60.0
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write(6,120) temps
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101 format(2i4, 2(2x,f9.5), i7, 3(i4), 2(2x,f9.5))
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107 format(i5, ' / ', i5, 5x, 2(i12) )
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120 format('total time: ', f8.2, ' minutes')
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end
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c----------------------------------------------------------------
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c this subroutine do the iterations
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c in pars: a
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c b
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c maxpasse
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c limit
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c out pars: passe
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c rx
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c ry
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c
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subroutine henon(a, b, maxpasse, passe, limit, rx, ry)
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double precision a, b, limit
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integer maxpasse, passe
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double precision rx, ry
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double precision x, x2, y, y2
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x = 0
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y = 0
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do 5 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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if (x .lt. -limit) goto 8
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if (x .gt. limit) goto 8
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if (y .lt. -limit) goto 8
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if (y .gt. limit) goto 8
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5 continue
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8 continue
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rx = x
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ry = y
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end
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c----------------------------------------------------------------
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