[location-component] Improve model scaling using expression.

app/src/main/java/com/mapbox/maps/testapp/examples/LocationComponentActivity.kt

@@ -67,7 +67,8 @@ class LocationComponentActivity : AppCompatActivity() {
     mapView.getLocationComponentPlugin().let {
       if (it.locationPuck == null) {
         it.locationPuck = ThreeDLocationPuck(
-          modelUri = "asset://race_car_model.gltf"
+          modelUri = "asset://race_car_model.gltf",
+          modelScale = listOf(0.1f, 0.1f, 0.1f)
         )
       } else {
         it.locationPuck = null

plugin-locationcomponent/src/main/java/com/mapbox/maps/plugin/locationcomponent/LocationComponentPluginImpl.kt

@@ -97,21 +97,6 @@ class LocationComponentPluginImpl : LocationComponentPlugin, LocationComponentSe
     locationProvider?.unRegisterLocationConsumer(this)
   }
 
-  /**
-   * Called whenever camera position changes.
-   */
-  override fun onCameraMove(
-    lat: Double,
-    lon: Double,
-    zoom: Double,
-    pitch: Double,
-    bearing: Double,
-    padding: Array<Double>?,
-    anchor: Pair<Double, Double>?
-  ) {
-    locationPuckManager?.updateCurrentZoomLevel(zoom)
-  }
-
   /**
    * Bind the ViewPlugin with current map context. This will create a View that
    * will be added to the MapView.

plugin-locationcomponent/src/main/java/com/mapbox/maps/plugin/locationcomponent/LocationIndicatorLayerRenderer.kt

@@ -63,10 +63,6 @@ internal class LocationIndicatorLayerRenderer(
     setLayerLocation(latLng)
   }
 
-  override fun setZoomLevel(zoomLevel: Double) {
-    // not supported
-  }
-
   override fun setBearing(bearing: Float) {
     setLayerBearing(bearing.toDouble())
   }

plugin-locationcomponent/src/main/java/com/mapbox/maps/plugin/locationcomponent/LocationLayerRenderer.kt

@@ -22,8 +22,6 @@ internal interface LocationLayerRenderer {
 
   fun setLatLng(latLng: Point)
 
-  fun setZoomLevel(zoomLevel: Double)
-
   fun setBearing(bearing: Float)
 
   fun setAccuracyRadius(accuracy: Float)

plugin-locationcomponent/src/main/java/com/mapbox/maps/plugin/locationcomponent/LocationPuckManager.kt

@@ -16,6 +16,4 @@ internal interface LocationPuckManager {
   fun updateCurrentPosition(point: Point)
 
   fun updateCurrentBearing(bearing: Float)
-
-  fun updateCurrentZoomLevel(zoomLevel: Double)
 }

plugin-locationcomponent/src/main/java/com/mapbox/maps/plugin/locationcomponent/LocationPuckManagerImpl.kt

@@ -8,6 +8,7 @@ import com.mapbox.maps.plugin.ThreeDLocationPuck
 import com.mapbox.maps.plugin.TwoDLocationPuck
 import com.mapbox.maps.plugin.delegates.MapDelegateProvider
 import com.mapbox.maps.plugin.locationcomponent.generated.LocationComponentSettings
+import kotlin.math.pow
 
 internal class LocationPuckManagerImpl(
   override var settings: LocationComponentSettings,
@@ -30,8 +31,6 @@ internal class LocationPuckManagerImpl(
 
   private var lastBearing: Float = 0.0f
 
-  private var lastZoomLevel: Double = delegateProvider.mapCameraDelegate.getZoom()
-
   private fun getLocationPuck(locationSettings: LocationComponentSettings): LocationPuck {
     return locationSettings.locationPuck ?: presetProvider.getPresetPuck(settings.presetPuckStyle)
   }
@@ -58,7 +57,6 @@ internal class LocationPuckManagerImpl(
       updateCurrentPosition(it)
     }
     updateCurrentBearing(lastBearing)
-    updateCurrentZoomLevel(lastZoomLevel)
     setLocationsStale(lastStaleState)
     if (settings.enabled) {
       show()
@@ -113,11 +111,6 @@ internal class LocationPuckManagerImpl(
     locationLayerRenderer.setBearing(bearing)
   }
 
-  override fun updateCurrentZoomLevel(zoomLevel: Double) {
-    lastZoomLevel = zoomLevel
-    locationLayerRenderer.setZoomLevel(zoomLevel)
-  }
-
   private fun prepareLocationIndicatorLayerBitmaps(puck: TwoDLocationPuck) {
     val topBitmap = puck.topImage?.let { bitmapProvider.generateBitmap(it, puck.topTintColor) }
     val topStaleBitmap =
@@ -142,15 +135,55 @@ internal class LocationPuckManagerImpl(
   }
 
   private fun styleScaling(settings: LocationComponentSettings) {
-    val scaleExpression = arrayListOf(
-      Value("interpolate"),
-      Value(arrayListOf(Value("linear"))),
-      Value(arrayListOf(Value("zoom"))),
-      Value(delegateProvider.mapTransformDelegate.getBounds().minZoom!!),
-      Value(settings.minZoomIconScale.toDouble()),
-      Value(delegateProvider.mapTransformDelegate.getBounds().maxZoom!!),
-      Value(settings.maxZoomIconScale.toDouble())
-    )
+    val puck = getLocationPuck(settings)
+    val minZoom = delegateProvider.mapTransformDelegate.getBounds().minZoom ?: 0.0
+    val maxZoom = delegateProvider.mapTransformDelegate.getBounds().maxZoom ?: 19.0
+    val scaleExpression = when (puck) {
+      is TwoDLocationPuck -> {
+        arrayListOf(
+          Value("interpolate"),
+          Value(arrayListOf(Value("linear"))),
+          Value(arrayListOf(Value("zoom"))),
+          Value(minZoom),
+          Value(settings.minZoomIconScale.toDouble()),
+          Value(maxZoom),
+          Value(settings.maxZoomIconScale.toDouble())
+        )
+      }
+      is ThreeDLocationPuck -> {
+        arrayListOf(
+          Value("interpolate"),
+          Value(arrayListOf(Value("exponential"), Value(0.5))),
+          Value(arrayListOf(Value("zoom"))),
+          Value(minZoom),
+          Value(
+            arrayListOf(
+              Value("literal"),
+              Value(
+                arrayListOf(
+                  Value(2.0.pow(maxZoom - minZoom) * puck.modelScale[0].toDouble()),
+                  Value(2.0.pow(maxZoom - minZoom) * puck.modelScale[1].toDouble()),
+                  Value(2.0.pow(maxZoom - minZoom) * puck.modelScale[2].toDouble())
+                )
+              )
+            )
+          ),
+          Value(maxZoom),
+          Value(
+            arrayListOf(
+              Value("literal"),
+              Value(
+                arrayListOf(
+                  Value(puck.modelScale[0].toDouble()),
+                  Value(puck.modelScale[1].toDouble()),
+                  Value(puck.modelScale[2].toDouble())
+                )
+              )
+            )
+          )
+        )
+      }
+    }
     locationLayerRenderer.styleScaling(scaleExpression)
   }
 

plugin-locationcomponent/src/main/java/com/mapbox/maps/plugin/locationcomponent/ModelLayerRenderer.kt

@@ -6,7 +6,6 @@ import com.mapbox.geojson.Point
 import com.mapbox.maps.StyleManagerInterface
 import com.mapbox.maps.plugin.ThreeDLocationPuck
 import com.mapbox.maps.plugin.locationcomponent.LocationComponentConstants.MODEL_SOURCE
-import kotlin.math.pow
 
 internal class ModelLayerRenderer(
   layerSourceProvider: LayerSourceProvider,
@@ -50,11 +49,6 @@ internal class ModelLayerRenderer(
     setLayerLocation(latLng)
   }
 
-  override fun setZoomLevel(zoomLevel: Double) {
-    val scale = 2.0.pow(MAX_ZOOM_LEVEL - zoomLevel)
-    modelLayer.modelScale(locationModelLayerOptions.modelScale.map { it * scale })
-  }
-
   override fun setBearing(bearing: Float) {
     setLayerBearing(bearing.toDouble())
   }
@@ -63,6 +57,7 @@ internal class ModelLayerRenderer(
   }
 
   override fun styleScaling(scaleExpression: List<Value>) {
+    modelLayer.modelScaleExpression(scaleExpression)
   }
 
   override fun setLocationStale(isStale: Boolean) {
@@ -110,8 +105,4 @@ internal class ModelLayerRenderer(
 
   override fun clearBitmaps() {
   }
-
-  companion object {
-    internal const val MAX_ZOOM_LEVEL = 19
-  }
 }

plugin-locationcomponent/src/main/java/com/mapbox/maps/plugin/locationcomponent/ModelLayerWrapper.kt

@@ -18,5 +18,7 @@ internal class ModelLayerWrapper(
 
   fun modelScale(scale: List<Double>) = updateProperty("model-scale", Value(scale.map { Value(it) }))
 
+  fun modelScaleExpression(scaleExpression: List<Value>) = updateProperty("model-scale", Value(scaleExpression))
+
   fun modelRotation(rotation: List<Double>) = updateProperty("model-rotation", Value(rotation.map { Value(it) }))
 }

sdk-base/src/main/java/com/mapbox/maps/plugin/locationcomponent/LocationComponentPlugin.kt

@@ -1,18 +1,15 @@
 package com.mapbox.maps.plugin.locationcomponent
 
-import com.mapbox.maps.plugin.ContextBinder
-import com.mapbox.maps.plugin.LifecyclePlugin
-import com.mapbox.maps.plugin.MapCameraPlugin
-import com.mapbox.maps.plugin.MapStyleObserverPlugin
+import com.mapbox.maps.plugin.*
 import com.mapbox.maps.plugin.locationcomponent.generated.LocationComponentSettingsInterface
 
 /**
  * Define the interfaces for the Location plugin.
  */
 interface LocationComponentPlugin :
+  MapPlugin,
   MapStyleObserverPlugin,
   LifecyclePlugin,
-  MapCameraPlugin,
   ContextBinder,
   LocationConsumer,
   LocationComponentSettingsInterface {