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platforms/ios/src/GMUHeatmapTileLayer.h

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+/* Copyright (c) 2017 Google Inc.
+ *
+ * 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
+ *
+ *     http://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.
+ */
+
+#import <GoogleMaps/GoogleMaps.h>
+
+#import "GMUGradient.h"
+#import "GMUWeightedLatLng.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+// A tile layer which renders a heat map.
+// The heat map uses convolutional smoothing of specific raidus with weighted data points in
+// combination with a gradient which maps intensity to colors to dynamically generate tiles.
+// Note: tiles are loaded on background threads, but the configuration properties are non-atomic.
+// To ensure consistency, the configuration properties are captured when changing the map property.
+// In order to change the values of a live layer, the map property must be reset.
+//
+// Overrides the default value for opacity to be 0.7 and sets the tile size to 512.  Changing the
+// tile size is not supported.
+@interface GMUHeatmapTileLayer : GMSSyncTileLayer
+
+// Positions and individual intensitites of the data which will be smoothed for display on the
+// tiles.
+@property(nonatomic, copy) NSArray<GMUWeightedLatLng *> *weightedData;
+
+// Radius of smoothing.
+// Larger values smooth the data out over a larger area, but also have a greater cost for generating
+// tiles.
+// It is not recommended to set this to a value greater than 50.
+@property(nonatomic) NSUInteger radius;
+
+// The gradient used to map smoothed intensities to colors in the tiles.
+@property(nonatomic) GMUGradient *gradient;
+
+// The minimum zoom intensity used for normalizing intensities, defaults to 5
+@property(nonatomic) NSUInteger minimumZoomIntensity;
+
+// The maximum zoom intensity used for normalizing intensities, defaults to 10
+@property(nonatomic) NSUInteger maximumZoomIntensity;
+
+@end
+
+NS_ASSUME_NONNULL_END