Stretch renderer

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/* Copyright 2017 Esri
 *
 * 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.
 *
 */

package com.esri.arcgisruntime.sample.stretchrenderer;

import java.util.Collections;

import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentManager;
import com.esri.arcgisruntime.layers.RasterLayer;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.Basemap;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.raster.MinMaxStretchParameters;
import com.esri.arcgisruntime.raster.PercentClipStretchParameters;
import com.esri.arcgisruntime.raster.Raster;
import com.esri.arcgisruntime.raster.StandardDeviationStretchParameters;
import com.esri.arcgisruntime.raster.StretchParameters;
import com.esri.arcgisruntime.raster.StretchRenderer;

public class MainActivity extends AppCompatActivity implements ParametersDialogFragment.ParametersListener {

  private FragmentManager mFragmentManager;

  private MapView mMapView;
  private RasterLayer mRasterLayer;

  private int mMin;
  private int mMax;
  private int mPercentClipMin;
  private int mPercentClipMax;
  private int mStdDevFactor;
  private StretchType mStretchType;

  @Override
  public void returnParameters(int min, int max, int percentClipMin, int percentClipMax, int stdDevFactor,
      StretchType stretchType) {
    //gets dialog box parameters and calls updateRenderer
    mMin = min;
    mMax = max;
    mPercentClipMin = percentClipMin;
    mPercentClipMax = percentClipMax;
    mStdDevFactor = stdDevFactor;
    mStretchType = stretchType;
    updateRenderer();
  }

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //set default values for stretch parameters
    mMin = 0;
    mMax = 255;
    mPercentClipMin = 0;
    mPercentClipMax = 99;
    mStdDevFactor = 1;
    mStretchType = StretchType.MIN_MAX;
    // retrieve the MapView from layout
    mMapView = findViewById(R.id.mapView);
    mFragmentManager = getSupportFragmentManager();

    // create raster
    Raster raster = new Raster(getExternalFilesDir(null) + getString(R.string.stretch_renderer_shasta_tif));
    mRasterLayer = new RasterLayer(raster);
    // create a basemap from the raster layer
    Basemap basemap = new Basemap(mRasterLayer);
    ArcGISMap map = new ArcGISMap(basemap);
    // add the map to a map view
    mMapView.setMap(map);
    updateRenderer();
  }

  /**
   * Creates StretchRenderer of the chosen type: MinMax, PercentClip or StandardDeviation.
   */
  private void updateRenderer() {
    StretchParameters stretchParameters;
    switch (mStretchType) {
      default:
        stretchParameters = new MinMaxStretchParameters(Collections.singletonList((double) mMin),
            Collections.singletonList((double) mMax));
        break;
      case PERCENT_CLIP:
        stretchParameters = new PercentClipStretchParameters(mPercentClipMin, mPercentClipMax);
        break;
      case STANDARD_DEVIATION:
        stretchParameters = new StandardDeviationStretchParameters(mStdDevFactor);
    }
    StretchRenderer stretchRenderer = new StretchRenderer(stretchParameters, null, true, null);
    mRasterLayer.setRasterRenderer(stretchRenderer);
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.blend_parameters, menu);
    return super.onCreateOptionsMenu(menu);
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    //send parameters to fragment
    ParametersDialogFragment paramDialog = new ParametersDialogFragment();
    Bundle stretchParameters = new Bundle();
    stretchParameters.putInt("min", mMin);
    stretchParameters.putInt("max", mMax);
    stretchParameters.putInt("percent_clip_min", mPercentClipMin);
    stretchParameters.putInt("percent_clip_max", mPercentClipMax);
    stretchParameters.putInt("std_dev_factor", mStdDevFactor);
    stretchParameters.putSerializable("stretch_type", mStretchType);
    paramDialog.setArguments(stretchParameters);
    paramDialog.show(mFragmentManager, "param_dialog");
    return super.onOptionsItemSelected(item);
  }

  @Override
  protected void onPause() {
    super.onPause();
    mMapView.pause();
  }

  @Override
  protected void onResume() {
    super.onResume();
    mMapView.resume();
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    mMapView.dispose();
  }

  enum StretchType {
    MIN_MAX("Min Max"),
    PERCENT_CLIP("Percent Clip"),
    STANDARD_DEVIATION("Standard Deviation");

    private final String stringValue;

    StretchType(String toString) {
      stringValue = toString;
    }

    @Override public String toString() {
      return stringValue;
    }
  }
}