text: /* 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 <UIKit/UIKIt.h>
  
  NS_ASSUME_NONNULL_BEGIN
  
  // Represents a mapping of intensity to color.  Interpolates between given set intensity and
  // color values to produce a full mapping for the range [0, 1].
  @interface GMUGradient : NSObject
  
  // Number of entries in the generated color map.
  @property(nonatomic, readonly) NSUInteger mapSize;
  
  // The specific colors for the specific intensities specified by startPoints.
  @property(nonatomic, readonly) NSArray<UIColor *> *colors;
  
  // The intensities which will be the specific colors specified in colors.
  @property(nonatomic, readonly) NSArray<NSNumber *> *startPoints;
  
  // Designated initializer.
  //
  // |colors| and |startPoints| must not be empty, and must have the same number of elements.
  // |startPoints| values must be in non-descending order and be float values in the range [0, 1].
  // |mapSize| must be at least two. Using more than 256 * colors.count is unlikely to provide any
  // quality improvement.
  - (instancetype)initWithColors:(NSArray<UIColor *> *)colors
                     startPoints:(NSArray<NSNumber *> *)startPoints
                    colorMapSize:(NSUInteger)mapSize;
  
  // Generates an array of mapSize colors for the interpolated colors for intensities between 0 and 1
  // inclusive.
  // If the provided startPoints do not cover the range 0 to 1, lower values interpolate towards
  // transparent black and higher values repeat the last provided color.
  - (NSArray<UIColor *> *)generateColorMap;
  
  @end
  
  NS_ASSUME_NONNULL_END
  