Polygon Helper - Kotlin SDK

This example show how to render Polygon/Multipolygon features with styles options like fill, optional pattern, and outline.

The vector layer helpers take your data and styling options and create the right source + layers on the current map style with minimal code. Helpers normalize sensible defaults like zoom range, outlines, etc. so you can get results quickly.

Polygon Helper - Kotlin SDK

Basic flow

This example show how to render Polygon/Multipolygon features with fill, optional pattern, and outline.

import com.maptiler.maptilersdk.map.MTMapView
import com.maptiler.maptilersdk.map.MTMapOptions
import com.maptiler.maptilersdk.map.MTMapViewController
import com.maptiler.maptilersdk.map.style.MTMapReferenceStyle
import com.maptiler.maptilersdk.helpers.MTPolygonLayerOptions
import com.maptiler.maptilersdk.helpers.MTPolygonLayerHelper

// After your MTMapView is on screen (Compose example)
val controller = MTMapViewController(context)
MTMapView(
    referenceStyle = MTMapReferenceStyle.DATAVIZ,
    options = MTMapOptions(),
    controller = controller,
)

// 1) Get the style once available
controller.style?.let { style ->
    val helper = style.polygonHelper()
    val polygonOptions = MTPolygonLayerOptions(
        data = "...GeoJSON polygon(s)...", // URL or inline string
        fillColor = "#1e90ff",
        fillOpacity = 0.5,
        outline = true,
        outlineColor = "white",
        outlineWidth = 1.2,
        outlineOpacity = 0.9,
    )
    helper.addPolygon(polygonOptions)
}

Learn more

Check the MTPolygonLayerHelper reference to understand how to create and manage point layers.

Review MTPolygonLayerOptions to explore all available configuration options.

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