This generalizes the oneway arrow logic for adding SVG markers along a
line. Using that functionality, certain tags get arrows on their
right-hand side, indicating which side is "inside", e.g. the
right-side of a cliff is the lower side.
The list of tags considered to be sided (unless there's a
two_sided=yes tag) is:
- natural=cliff
- natural=coastline
- barrier=retaining_wall
- barrier=kerb
- barrier=guard_rail
- barrier=city_wall
- man_made=embankment
The triangles attempt to be reminiscent of the triangles used for
rendering cliffs on OSM (and elsewhere). The different tags get
different renderings (e.g. colors that match the main way, and
different spacings). In addition, natural=coastline is special-cased
to have blue markers (despite having a green way), to emphasise that
the "inside" of a coastline is the water.
Fixes https://github.com/openstreetmap/iD/issues/1475.
Some highlights
- `getSiblingAndChildVertices` are expensive, so they're saved and called less frequently
- draw touch targets for all the visible vertices
- remove redundant css classes and `setClass` function
This is more work to further isolate the layers that entities draw to.
It makes it easier to debug what is going on, and can eventually lead to
deferred drawing, if each draw function is in its own place and not dependant
on anything else.
I've started to replace the vertex-hover with an explicit layer for touch
targets.
Also had to change a lot of the svg tests, which are really brittle.
Things would happen like - the surface would be created, it would kick of a
deferred redraw, which would notice that the zoom was 0 and call
editOff, which would remove the osm layers that were just created and
that the tests were trying to draw to. These tests need proper zoom and
projection otherwise nothing works.
Bryan Housel