Created
June 13, 2019 15:52
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generate mandelbrot set
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program mand | |
integer , parameter :: width = 1920*3 | |
integer , parameter :: height = 1080*3 | |
integer, dimension (width, height, 3) :: image | |
integer :: col, row, iteration, max, max_rgb, pan_x | |
real :: r_x, r_y, x, y, x_new, color_idx, zoom | |
pan_x = -300 | |
pan_y = 0 | |
max = 1000 | |
max_rgb = 256**3 | |
zoom = 1 | |
do row = 0, height-1 | |
do col = 0, width-1 | |
c_re = ((pan_x+col)-width/2.0)*4.0/width | |
c_im = ((pan_y+row) - height/2.0)*4.0/width | |
c_re = c_re / zoom | |
c_im = c_im / zoom | |
x = 0.0 | |
y = 0.0 | |
iteration = 0 | |
do while(x*x+y*y <= 4.0 .and. iteration<max) | |
x_new = x*x - y*y + c_re | |
y = 2*x*y + c_im | |
x = x_new | |
iteration = iteration + 1 | |
end do | |
if (iteration<max) then | |
image(col+1, row+1, 1) = int(min(255, iteration*2)) | |
image(col+1, row+1, 2) = int(min(255, iteration*5)) | |
image(col+1, row+1, 3) = int(min(255, iteration*10)) | |
else | |
image(col+1, row+1, 1) = 0 | |
image(col+1, row+1, 2) = 0 | |
image(col+1, row+1, 3) = 0 | |
end if | |
end do | |
end do | |
open (10, file = 'out.ppm') | |
write (10, '(a/ i0, 1x, i0/ i0)') 'P3', width, height, 255 | |
do row = 0, height-1 | |
do col = 0, width-1 | |
write (10, '(i0)') image(col+1, row+1, 1), image(col+1, row+1, 2), image(col+1, row+1, 3) | |
end do | |
end do | |
close(10) | |
end program mand |
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