9-patch image

package com.mapbox.maps.testapp.examples
 
import android.graphics.BitmapFactory
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import com.mapbox.geojson.Feature
import com.mapbox.geojson.Point
import com.mapbox.maps.CameraOptions
import com.mapbox.maps.MapView
import com.mapbox.maps.Style
import com.mapbox.maps.extension.style.image.image9Patch
import com.mapbox.maps.extension.style.layers.generated.SymbolLayer
import com.mapbox.maps.extension.style.layers.generated.symbolLayer
import com.mapbox.maps.extension.style.layers.getLayer
import com.mapbox.maps.extension.style.layers.properties.generated.IconTextFit
import com.mapbox.maps.extension.style.sources.generated.geoJsonSource
import com.mapbox.maps.extension.style.style
import com.mapbox.maps.testapp.R
 
/**
* Example showcasing of adding 9-patch image to style
* and demonstrating how it works when stretching image.
*/
class NinePatchImageActivity : AppCompatActivity() {
 
private var appendTextCounter = 1
private lateinit var style: Style
private lateinit var mapView: MapView
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
mapView = MapView(this)
setContentView(mapView)
mapView.mapboxMap.loadStyle(
styleExtension = style(Style.STANDARD) {
+image9Patch(
NINE_PATCH_ID,
BitmapFactory.decodeResource(resources, R.drawable.blue_round_nine)
)
+geoJsonSource(SOURCE_ID) {
feature(Feature.fromGeometry(CENTER))
}
+symbolLayer(LAYER_ID, SOURCE_ID) {
iconImage(NINE_PATCH_ID)
// make sure we stretch image both in X and Y
iconTextFit(IconTextFit.BOTH)
iconTextFitPadding(listOf(5.0, 5.0, 5.0, 5.0))
textField(TEXT_BASE)
}
}
) {
style = it
updateIconText()
}
mapView.mapboxMap.setCamera(
CameraOptions.Builder()
.center(CENTER)
.zoom(ZOOM)
.build()
)
}
 
private val runnable = {
if (style.isValid()) {
val layer = (style.getLayer(LAYER_ID) as SymbolLayer)
layer.textField("${layer.textField?.getTextAsString()} $TEXT_BASE")
appendTextCounter++
if (appendTextCounter.rem(3) == 0) {
layer.textField("${layer.textField?.getTextAsString()}\n")
}
updateIconText()
}
}
 
// start appending text in a loop, stretching icon in both X and Y
private fun updateIconText() {
mapView.postDelayed(
runnable,
TEXT_UPDATE_TIME_MS
)
}
 
override fun onStop() {
super.onStop()
mapView.removeCallbacks(runnable)
}
companion object {
private const val NINE_PATCH_ID = "red"
private const val SOURCE_ID = "source_id"
private const val LAYER_ID = "layer_id"
private val CENTER = Point.fromLngLat(12.554729, 55.70651)
private const val ZOOM = 9.0
private const val TEXT_BASE = "Hi!"
private const val TEXT_UPDATE_TIME_MS = 1500L
}
}