Convert MarkerIconFactory and test to Kotlin

gnd/src/main/java/com/google/android/gnd/ui/MarkerIconFactory.kt

@@ -0,0 +1,63 @@
+/*
+ * Copyright 2018 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.android.gnd.ui
+
+import android.content.Context
+import javax.inject.Singleton
+import javax.inject.Inject
+import dagger.hilt.android.qualifiers.ApplicationContext
+import android.graphics.Bitmap
+import android.graphics.Canvas
+import androidx.appcompat.content.res.AppCompatResources
+import com.google.android.gnd.R
+import com.google.android.gnd.ui.home.mapcontainer.MapContainerViewModel
+import android.graphics.PorterDuff
+import androidx.annotation.ColorInt
+import androidx.core.content.res.ResourcesCompat
+import com.google.android.gms.maps.model.BitmapDescriptor
+import com.google.android.gms.maps.model.BitmapDescriptorFactory
+
+@Singleton
+class MarkerIconFactory @Inject constructor(@ApplicationContext private val context: Context) {
+    fun getMarkerBitmap(color: Int, currentZoomLevel: Float): Bitmap {
+        val outline = AppCompatResources.getDrawable(context, R.drawable.ic_marker_outline)
+        val fill = AppCompatResources.getDrawable(context, R.drawable.ic_marker_fill)
+        val overlay = AppCompatResources.getDrawable(context, R.drawable.ic_marker_overlay)
+        // TODO: Adjust size based on selection state.
+        var scale = ResourcesCompat.getFloat(context.resources, R.dimen.marker_bitmap_default_scale)
+        if (currentZoomLevel >= MapContainerViewModel.ZOOM_LEVEL_THRESHOLD) {
+            scale = ResourcesCompat.getFloat(context.resources, R.dimen.marker_bitmap_zoomed_scale)
+        }
+        val width = (outline!!.intrinsicWidth * scale).toInt()
+        val height = (outline.intrinsicHeight * scale).toInt()
+        val bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888)
+        val canvas = Canvas(bitmap)
+        outline.setBounds(0, 0, width, height)
+        outline.draw(canvas)
+        fill!!.setColorFilter(color, PorterDuff.Mode.SRC_ATOP)
+        fill.setBounds(0, 0, width, height)
+        fill.draw(canvas)
+        overlay!!.setBounds(0, 0, width, height)
+        overlay.draw(canvas)
+        return bitmap
+    }
+
+    fun getMarkerIcon(@ColorInt color: Int, currentZoomLevel: Float): BitmapDescriptor {
+        val bitmap = getMarkerBitmap(color, currentZoomLevel)
+        // TODO: Cache rendered bitmaps.
+        return BitmapDescriptorFactory.fromBitmap(bitmap)
+    }
+}

gnd/src/test/java/com/google/android/gnd/ui/MarkerIconFactoryTest.kt

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+/*
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.android.gnd.ui
+
+import android.content.Context
+import dagger.hilt.android.testing.HiltAndroidTest
+import org.junit.runner.RunWith
+import org.robolectric.RobolectricTestRunner
+import com.google.android.gnd.BaseHiltTest
+import javax.inject.Inject
+import dagger.hilt.android.qualifiers.ApplicationContext
+import org.junit.Before
+import androidx.appcompat.content.res.AppCompatResources
+import com.google.android.gnd.R
+import android.graphics.Bitmap
+import android.graphics.Color
+import androidx.core.content.res.ResourcesCompat
+import com.google.android.gnd.ui.home.mapcontainer.MapContainerViewModel
+import com.google.common.truth.Truth.assertThat
+import org.junit.Test
+
+@HiltAndroidTest
+@RunWith(RobolectricTestRunner::class)
+class MarkerIconFactoryTest : BaseHiltTest() {
+    @Inject
+    @ApplicationContext
+    lateinit var context: Context
+
+    @Inject
+    lateinit var markerIconFactory: MarkerIconFactory
+    private var markerUnscaledWidth = 0
+    private var markerUnscaledHeight = 0
+
+    @Before
+    override fun setUp() {
+        super.setUp()
+        val outline = AppCompatResources.getDrawable(context, R.drawable.ic_marker_outline)
+        markerUnscaledWidth = outline!!.intrinsicWidth
+        markerUnscaledHeight = outline.intrinsicHeight
+    }
+
+    @Test
+    fun markerBitmap_zoomedOut_scaleIsSetCorrectly() {
+        val bitmap = markerIconFactory.getMarkerBitmap(
+            Color.BLUE,
+            MapContainerViewModel.ZOOM_LEVEL_THRESHOLD - 0.1f
+        )
+
+        val scale =
+            ResourcesCompat.getFloat(context.resources, R.dimen.marker_bitmap_default_scale)
+        verifyBitmapScale(bitmap, scale)
+    }
+
+    @Test
+    fun markerBitmap_zoomedIn_scaleIsSetCorrectly() {
+        val bitmap = markerIconFactory.getMarkerBitmap(
+            Color.BLUE,
+            MapContainerViewModel.ZOOM_LEVEL_THRESHOLD
+        )
+
+        val scale =
+            ResourcesCompat.getFloat(context.resources, R.dimen.marker_bitmap_zoomed_scale)
+        verifyBitmapScale(bitmap, scale)
+    }
+
+    private fun verifyBitmapScale(bitmap: Bitmap, scale: Float) {
+        val expectedWidth = (markerUnscaledWidth * scale).toInt()
+        val expectedHeight = (markerUnscaledHeight * scale).toInt()
+        assertThat(bitmap.width).isEqualTo(expectedWidth)
+        assertThat(bitmap.height).isEqualTo(expectedHeight)
+    }
+}