How to dynamically set the SymbolLayer textTranslate based on feature properties? #910

ibyxz · 2026-08-14T06:03:25Z

ibyxz
Aug 14, 2026

What are you trying to achieve?

I'm trying to set the SymbolLayer textTranslate based on feature properties? I've tried switch and step, but neither worked

Affected Platform(s)

Library Version

0.14.0

What have you tried?

textTranslate = switch(
    input = feature["repeat"].asString(),
    case("0", const(DpOffset( 0.dp, (-4).dp))),
    case("1", const(DpOffset( 32.dp, (-4).dp))),
    case("2", const(DpOffset( 32.dp.times(2), (-4).dp))),
    fallback = const(DpOffset( 0.dp, (-4).dp))
),

Additional context

No response

akashxmohan0099 · 2026-08-15T04:30:08Z

akashxmohan0099
Aug 15, 2026

textTranslate is the limiting factor here, rather than the switch syntax. In the MapLibre style specification, text-translate has basic Android/iOS support but no data-driven-styling support row. A feature[...] expression therefore cannot drive this property on the native targets, whether it is wrapped in switch or step.

Use textOffset when an em-based offset is acceptable. It is a layout property with data-driven styling support and MapLibre Compose exposes it as Expression<TextUnitOffsetValue>:

textOffset = switch(
    input = feature["repeat"].asString(),
    case("0", offset(0.em, (-0.25).em)),
    case("1", offset(2.em, (-0.25).em)),
    case("2", offset(4.em, (-0.25).em)),
    fallback = offset(0.em, (-0.25).em),
)

Those example ratios assume roughly 16 px text, where 32 px is about 2.em and -4 px is about -0.25.em; adjust them to the actual text size. text-offset also participates in symbol placement, which is usually desirable for labels.

If you specifically need a paint-time pixel translation that does not change placement/collision behaviour, the portable workaround is to split the features into separate filtered SymbolLayers and give each layer a constant textTranslate. The property itself cannot be feature-driven on Android/iOS today.

Relevant spec entries: https://maplibre.org/maplibre-style-spec/layers/#text-translate and https://maplibre.org/maplibre-style-spec/layers/#text-offset

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How to dynamically set the SymbolLayer textTranslate based on feature properties? #910

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How to dynamically set the SymbolLayer textTranslate based on feature properties? #910

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ibyxz Aug 14, 2026

What are you trying to achieve?

Affected Platform(s)

Library Version

What have you tried?

Additional context

Replies: 1 comment

Uh oh!

akashxmohan0099 Aug 15, 2026

ibyxz
Aug 14, 2026

akashxmohan0099
Aug 15, 2026