JOSM, control circle icons relation to zoom levels.

Question

I want a control circle as a icon (transparent). That I can set on in Mappaintstyle. Josm and zoom levels, in relation to the length and width of an icon

Is there a table to see these relations? zoomlevel 1= x px or x mm zoomlevel 2 = y px or y mm

So I can make for every zoomlevel a icon.

For example 500 meter icons

Answer 1

If you want to display a circle then using symbol instead of an icon sounds more reasonable. See https://josm.openstreetmap.de/wiki/Help/Styles/MapCSSImplementation#Iconandsymbolstyles

Regarding size calculations, you could have a look how its done in the Lane and Road Attributes mappaint style https://josm.openstreetmap.de/wiki/Styles/Lane_and_Road_Attributes

some extracts from there:

/*------------------------------*/
/* Pixel per metre (on average) */
/*------------------------------*/
*|z16  { pixel_per_metre: 0.625; }
*|z17  { pixel_per_metre: 1.25; }
*|z18  { pixel_per_metre: 2.5; }
*|z19  { pixel_per_metre: 5; }
*|z20  { pixel_per_metre: 10; }
*|z21  { pixel_per_metre: 20; }
*|z22  { pixel_per_metre: 40; }
*|z23  { pixel_per_metre: 80; }
*|z24  { pixel_per_metre: 160; }
*|z25  { pixel_per_metre: 320; }
*|z26- { pixel_per_metre: 640; }


/*-------------*/
/* Street lamp */  
/*-------------*/
node|z17-[highway="street_lamp"]::Lighting_1
{
symbol-shape: circle;
symbol-size: eval(12 * prop(pixel_per_metre,"default"));
symbol-fill-color: white;
symbol-fill-opacity: 0.07;
}
node|z17-[highway="street_lamp"]::Lighting_2
{
symbol-shape: circle;
symbol-size: eval(18 * prop(pixel_per_metre,"default"));
symbol-fill-color: white;
symbol-fill-opacity: 0.05;
}
node|z17-[highway="street_lamp"]::Lighting_3
{
symbol-shape: circle;
symbol-size: eval(25 * prop(pixel_per_metre,"default"));
symbol-fill-color: white;
symbol-fill-opacity: 0.05;
}

JOSM, control circle icons relation to zoom levels.

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