[Therion] There's Grids then and there's Grids

[Stacho Mudrak]

Quoting Bruce Mutton <bruce.mutton at paradise.net.nz>:
> Ah, Stacho.  Two types of grids!
> That explains part of my conundrum. Now that I know it exists I'm not sure
> what the map atlas grid might be for?

To show atlas pages layout, when "export atlas" is used.

> The other relates to the co-ordinate grid; illustrated by the attached pdfs,
> scaled at 1:1000.
> When specified as 10 10 10 I get nice continuous grids, but when specified
> as 50 50 50 or 100 100 100 (and no other changes) I get cross hairs, which
> are not too my liking.

You get 1cm cross-hairs also in 10 10 10 grid, but they are too close to each
other :) Just redefine grid symbol to receive solid grid -- i.e. add following
lines to your layout:

code metapost
def s_hgrid (expr xpos, ypos, xsize, ysize) =
  pickup PenD;
  draw (
    if xpos < 0: 0 else: -xsize/2 fi, 0
  ) -- (
    if xpos > 0: 0 else: xsize/2 fi, 0
  );
  draw (
    0, if ypos < 0: 0 else: -ysize/2 fi
  ) -- (
    0, if ypos > 0: 0 else: ysize/2 fi
  );
enddef;
endcode

Regards, S.