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#include<cairo.h>
#include<stdlib.h>
#include<string.h>

int
main (int argc, char *argv[])
{
  int seed = atoi(argv[1]);
  if(argc<2) exit(1);
  srand(seed);
  double w = 900., h = 900.;
  char fn[200];
  strcpy(fn, "v");
  strcat(fn, argv[1]);
  strcat(fn, ".png");
  cairo_surface_t *surface =
    cairo_image_surface_create (CAIRO_FORMAT_ARGB32, w, h);
  cairo_t *cr = cairo_create (surface);

  cairo_set_source_rgb (cr, 1, 1, 1);
  cairo_rectangle (cr, 0, 0, w, h);
  cairo_fill (cr);

  int i=0;
  for(;i<100;++i)
  {
    cairo_set_line_width (cr, 1.+(rand()%10));
    cairo_set_source_rgba (cr, 0.5-seed/30. + (rand()%400)/800., seed/30. +(rand()%400)/1600.,seed/15., 1);
    int x0 = 10 + rand()%((int)w-100);
    int y0 = 10 + rand()%((int)h-100);
    int xoff = 80+ rand()%((int)w-x0-89);
    int yoff = 80+ rand()%((int)h-y0-89);
    cairo_move_to(cr, x0, y0);
    cairo_rel_line_to (cr, xoff, yoff);
    cairo_stroke (cr);
  }


  cairo_destroy (cr);
  cairo_surface_write_to_png (surface, fn);
  cairo_surface_destroy (surface);
  return 0;
}