Blue hexagon shields for Pakistan National Highways

[bgo-eiu]

As this shape is already included in the repository for Japanese prefectural shields, this PR changes the name of the SVG file for the blue hexagonal shield shape from a country specific description to hexagon_blue. The shield_defs.js file has then been updated to reflect these changes for Japanese prefectural shields, and to include the Pakistan National Highway shields described in #396 using the same parameters.

[bgo-eiu]

Example, N-5 at Torkham

[claysmalley]

We'll need a better naming scheme to distinguish horizontally-oriented and vertically-oriented hexagon shields. I would recommend adding horizontal to the blue hexagon shield's filename. I gave the following shield the name shield40_hexagon_wide_green.svg, but wide should probably be changed to vertical:

Text inside this shield is very small when it has 4 or more characters. The photos in #396 indicate that the hexagon can be horizontally expanded to accommodate longer text, so let's make a variant of this SVG with a width somewhere between 25 and 30 pixels, whatever looks right:

[ZeLonewolf]

Horizontal means the pointy ends east and west, right?

[claysmalley]

That's what I'm thinking. Two of the six sides of the hexagon run horizontally.

[michaelblyons]

Horizontal means the pointy ends east and west, right?

That makes sense to me. For a pentagon or other odd-sided figure, I'd name its orientation by the cardinal side with a vertex (i.e. the ones like this are "up").

See also: Graphviz shapes, particularly triangle/invtriangle.

[claysmalley]

Here's a wider hexagon I think matches the real-life signs a little better:

Don't worry about renaming the files; I'll refactor it all eventually.

[bgo-eiu]

Oh thank you! I've been waiting to have time to make a green semi circle SVG for the motorways and one for Lahore Ring Road. I heard back from the active Pakistani route mapper and they said the tags I suggested for those are fine so long as I don't change any of the tags that relate to them being controlled access highways.

[ZeLonewolf]

Setting to draft pending shield update

[claysmalley]

Here's a motorway shield:

I played around with the Lahore Ring Road shield and I couldn't manage to make the text big enough to be legible. This route may need an ovalShield or pillShield treatment.

[claysmalley]

Shields are up and running:

[1ec5]

This looks good to go. We can continue to track provincial and district roads in #396.