Error in MAPCSS regarding LAYER and SET's ?

[mikeho]

I am in the process of building some useful mapcss for JOSM. Concerning the turnouts this works, in that I have stored a corresponding graphic for each configuration.

Regarding the signals I had the idea to build the possible signal states on the fly from a few graphics (e.g. black background in front of green / red / yellow dot for ks1 / hp0 / ...).

The following works:

node z17-["railway:signal:combined:states" *= "DE-ESO:hp0"]::layer_signal_611,
node z17-["railway:signal:main:states" *= "DE-ESO:hp0"]::layer_signal_611 {
    z-index: 611;
    icon-image: "icons/light_rr.png";
    icon-offset-x: 0;
    icon-offset-y: -20;
    allow-overlap: true;
}
node z17-["railway:signal:combined:states" *= "DE-ESO:ks1"]::layer_signal_612,
node z17-["railway:signal:main:states" *= "DE-ESO:ks1"]::layer_signal_612 {
    z-index: 612;
    icon-image: "icons/light_gr.png";
    icon-offset-x: -5;
    icon-offset-y: -10;
    allow-overlap: true;
}
node z17-["railway:signal:combined:states" *= "DE-ESO:ks2"]::layer_signal_613,
node z17-["railway:signal:main:states" *= "DE-ESO:ks2"]::layer_signal_613 {
    z-index: 613;
    icon-image: "icons/light_or.png";
    icon-offset-x: 5;
    icon-offset-y: -10;
    allow-overlap: true;
}

My idea to first remember the states via Set (classes) does not work regarding the display in connection with the layers (without ::layer___ it works))

1) get status

node["railway:signal:combined:states" *= "DE-ESO:hp0"], node["railway:signal:main:states" *= "DE-ESO:hp0"] { set .sg_hp0; }

node["railway:signal:combined:states" *= "DE-ESO:ks1"], node["railway:signal:main:states" *= "DE-ESO:ks1"] { set .sg_ks1; }

node["railway:signal:combined:states" *= "DE-ESO:ks2"], node["railway:signal:main:states" *= "DE-ESO:ks2"] { set .sg_ks2; }

2) display

node.sg_hp0::layer_signal_611 {
    z-index: 611;
    icon-image: "icons/light_rr.png";
    icon-offset-x: 0;
    icon-offset-y: -20;
    allow-overlap: true;
}
node.sg_ks1::layer_signal_612 {
    z-index: 612;
    icon-image: "icons/light_gr.png";
    icon-offset-x: -5;
    icon-offset-y: -10;
    allow-overlap: true;
}
node.sg_ks2::layer_signal_613 {
    z-index: 613;
    icon-image: "icons/light_or.png";
    icon-offset-x: 5;
    icon-offset-y: -10;
    allow-overlap: true;
}

Unfortunately I didn't find anything useful at wiki:Help/Styles/MapCSSImplementation. Can't JOSM do the combo of layer and sets or am I thinking wrong?

Many greetings
mikeho

Translated with www.DeepL.com/Translator (free version)

[taylor.smock]

A couple of notes:

1. You didn't need to add yourself to cc -- the reporter will get replies sent to them.
2. You can format the mapcss code by wrapping it in {{{#!mapcss }}}. Example:

   {{{#!mapcss
   [mapcss here]
   }}}
   

3. You shouldn't have to add .png to the icon-image paths -- JOSM will automatically try .png and .svg.
4. You are doing a set operation in (1) on the "default" layer. So you want to use prop(p_name, layer_name) or the equivalent for is_prop_set in (2), depending upon what you are trying to do. Example:

   node[is_prop_set("sg_hp0", "default")]::layer_signal_611 {
       z-index: 611;
       icon-image: "icons/light_rr.png";
       icon-offset-x: 0;
       icon-offset-y: -20;
       allow-overlap: true;
   }
   

[mikeho]

Where can I find this (History - A couple of notes:) in a normal/standard documentation?

[taylor.smock]

2. See wiki:WikiProcessors#AvailableProcessors . I don't expect people to read it, but I figured I'd bring up a way to format the mapcss in a pretty/more readable format, just in case you make a bunch of mapcss tickets.
3. I don't know if this is explicitly documented somewhere. But it should probably be documented in wiki:Help/Styles/Images#Includingimagesinstyles .
4. See wiki:Help/Styles/MapCSSImplementation#LayerIdentifier for what the default layer is ("default"). Documentation for prop(p_name) says "value of the property p_name of the current layer, e.g. prop("width")" (see wiki:Help/Styles/MapCSSImplementation#Evalexpressions )

[mikeho]

1. many Tanks !
2. Mostly I look in wiki:Help/Styles/MapCSSImplementation to unterstand JOSM MAPCSS, but often I didn't found what I'm looking for. Who to ask for help?

Examples:

3. How to get the rotation angel of a WAY in a NODE ? Coincidentally, I found the following in ticket #10217:

...
icon-rotation: way;
...

but what I need is something like that (transfromed from VBA to MAPCSS):

...
/* in VBA */
Dim way_angle as single
way_angle = function_angel_of_way_on_node()

icon-rotation =  way_angle + 90     /* 90 Grad */

/* in MAPCSS ? */
...
...
...

4. How to use variabel in MAPCSS for some calculation? Are functions like SINUS, COSINUS available?

5. Last question today: What about text-align or text-alignment-horizontal = left/right/centre to put text on the left or right site of a icon? The Text are values of tags:

...
node|z17-["railway"*="signal"]  { set sg; }
...

...
node[is_prop_set("sg", "default")]::layer_signal_602    { z-index: 602;  icon-image: "icons/bg_light_signal"; allow-overlap: true; }  
...

...
node[is_prop_set("sg", "default")]::layer_400 { z-index: 400; text-offset-x: 20; text-offset-y:  10;    
        text:                   note;            

        text-alignment-horizontal = left;   /* = default, on left side of icon  *******/

        font-size:              12;
        text-color:             #FFFFFF;        text-halo-opacity: 1;
        text-halo-color:        #202020;        text-halo-radius:  2;
        text-allow-overlap: true; }

node[is_prop_set("sg", "default")]::layer_401 { z-index: 402; text-offset-x: 20; text-offset-y:  0;     
        text:                   fixme;           

        text-alignment-horizontal = left;   /* = default *******/

        font-size:              12;
        text-color:             #FFFFFF;        text-halo-opacity: 1;
        text-halo-color:        #202020;        text-halo-radius:  2;
        text-allow-overlap: true; }

node[is_prop_set("sg", "default")]::layer_402 { z-index: 402; text-offset-x: 20; text-offset-y:  0;     
        text:                   ref;                    

        text-alignment-horizontal = right;    /* on left side of icon  *******/

        font-size:              12;
        text-color:             #FFFFFF;        text-halo-opacity: 1;
        text-halo-color:        #202020;        text-halo-radius:  2;
        text-allow-overlap: true; }
...

thanks, mikeho

[taylor.smock]

2. #josm on OFTC IRC has some activity. I'm on it, but only Monday-Thursday.
3. Not currently possible. Sorry.
4. Assuming SINUS and COSINUS are sin/cosine functions, they are available (see Help/Styles/MapCSSImplementation#Evalexpressions , specifically look for "asin, atan, atan2, ceil, cos, cosh, exp, floor, log, max, min, mod (since r17759), random, round, signum, sin, sinh, sqrt, tan, tanh"). To use a variable, set the variable first (e.g. _x: someValue) and then use prop("_x") to get it back. You can do something like _x: 5; _angle: cos(prop("_x"));.
5. Have you looked at text-anchor-horizontal?

[mikeho]

additional question:
who to get osmstimestamp in a format like this: YYYY-MM-DD hh:mm:ss

[taylor.smock]

I don't believe we currently have that as an option. You *can* get the time (in seconds) since the epoch though.