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Waterfall in a separate window

window1

This is a multi-window mode.

  p = gdk_pixbuf_get_pixels(pixbuf) + (iwater                  ) * rowstride;
  q = gdk_pixbuf_get_pixels(pixbuf) + (iwater + WATERFALL_YSIZE) * rowstride;
  for(int j=0;j<WATERFALL_XSIZE;j++) {
       double tmp  = waterfall2[j];
       *p++ = *q++ = colormap_r(tmp);
       *p++ = *q++ = colormap_g(tmp);
       *p++ = *q++ = colormap_b(tmp);
  }

The parameter, WATERFALL_YSIZE, could be more flexible in this mode. You can directly resize the window using a mouse.