MapLibreParticleLab/platform/android/docs/styling/data-driven-style.md

Data Driven Style

{{ activity_source_note("DataDrivenStyleActivity.kt") }}

In this example we will look at various types of data-driven styling.

The examples with 'Source' in the title apply data-driven styling the parks of Amsterdam. Those examples often are based on the somewhat arbitrary stroke-width property part of the GeoJSON features. These examples are therefore most interesting to learn about the Kotlin API that can be used for data-driven styling.

!!! tip Refer to the MapLibre Style Spec for more information about expressions such as interpolate and step.

Exponential Zoom Function

--8<-- "MapLibreAndroidTestApp/src/main/java/org/maplibre/android/testapp/activity/style/DataDrivenStyleActivity.kt:addExponentialZoomFunction"

Interval Zoom Function

--8<-- "MapLibreAndroidTestApp/src/main/java/org/maplibre/android/testapp/activity/style/DataDrivenStyleActivity.kt:addIntervalZoomFunction"

["step",["zoom"],["rgba",0.0,255.0,255.0,1.0],1.0,["rgba",255.0,0.0,0.0,1.0],5.0,["rgba",0.0,0.0,255.0,1.0],10.0,["rgba",0.0,255.0,0.0,1.0]]

Exponential Source Function

--8<-- "MapLibreAndroidTestApp/src/main/java/org/maplibre/android/testapp/activity/style/DataDrivenStyleActivity.kt:addExponentialSourceFunction"

Categorical Source Function

--8<-- "MapLibreAndroidTestApp/src/main/java/org/maplibre/android/testapp/activity/style/DataDrivenStyleActivity.kt:addCategoricalSourceFunction"

Identity Source Function

--8<-- "MapLibreAndroidTestApp/src/main/java/org/maplibre/android/testapp/activity/style/DataDrivenStyleActivity.kt:addIdentitySourceFunction"

Interval Source Function

--8<-- "MapLibreAndroidTestApp/src/main/java/org/maplibre/android/testapp/activity/style/DataDrivenStyleActivity.kt:addIntervalSourceFunction"

Composite Exponential Function

--8<-- "MapLibreAndroidTestApp/src/main/java/org/maplibre/android/testapp/activity/style/DataDrivenStyleActivity.kt:addCompositeExponentialFunction"

Identity Source Function

--8<-- "MapLibreAndroidTestApp/src/main/java/org/maplibre/android/testapp/activity/style/DataDrivenStyleActivity.kt:addIdentitySourceFunction"

Composite Interval Function

--8<-- "MapLibreAndroidTestApp/src/main/java/org/maplibre/android/testapp/activity/style/DataDrivenStyleActivity.kt:addCompositeIntervalFunction"

Composite Categorical Function

--8<-- "MapLibreAndroidTestApp/src/main/java/org/maplibre/android/testapp/activity/style/DataDrivenStyleActivity.kt:addCompositeCategoricalFunction"