z-index does not affect casing

[anonymous]

this rule will only overlay the inner line, not the outer casings:

way[bridge=yes]
{
  casing-width:+3;
  casing-color:white;
  z-index:4;
}

[bastiK]

At the moment, casings have a constant z-index (-100). What do you suggest? Btw. casing is nothing more than a second line below, so it is really just a shortcut.

[Vidar Gundersen]

Would it be feasible to use the z-index of the line -1 instead of a constant?

(I also observed that the MapCSS 0.2 proposal suggests to change the casing-width from total width to "extra width on each side". I think the casing-width:+1; is better, as it is backwards compatible.)

[bastiK]

Replying to Vidar Gundersen:

Would it be feasible to use the z-index of the line -1 instead of a constant?

I don't want any line be below any casing. If secondary and residential road meet at a junction (and they have z-index difference of 2 or more) this would be the case. I agree that it should be "z-index of line - n". What is the disadvantage of n=100? If there is any, n=20 would be fine, I guess.

(I also observed that the MapCSS 0.2 proposal suggests to change the casing-width from total width to "extra width on each side". I think the casing-width:+1; is better, as it is backwards compatible.)

+1, not so much because of backwards compatibility, but because it offers 2 options:

• either relative: casing-width: +2;
• or absolute: casing-width: 13;

[bastiK]

In [4305/josm]:

fixed #5950 - z-index does not affect casing