Application: gvSIG desktop » gvSIG tools: ToolBox

package es.unex.sextante.gridStatistics.base;

import es.unex.sextante.additionalInfo.AdditionalInfoNumericalValue;

import es.unex.sextante.core.GeoAlgorithm;

import es.unex.sextante.core.Sextante;

import es.unex.sextante.dataObjects.IRasterLayer;

import es.unex.sextante.exceptions.GeoAlgorithmExecutionException;

import es.unex.sextante.exceptions.RepeatedParameterNameException;

;

public abstract class NeighborhoodStatsBaseAlgorithm

         extends

            GeoAlgorithm {

   private static final String LAYER        = "LAYER";

   private static final String RADIUS       = "RADIUS";

   private static final String FORCE_NODATA = "NODATA";

   private static final String RESULT       = "RESULT";

   protected double            NO_DATA;

   private int                 m_iRadius;

   private boolean             m_bForceNoData;

   private boolean             m_bIsValidCell[][];

   private IRasterLayer        m_window;

   protected double            m_dValues[];

   @Override

   public void defineCharacteristics() {

      setUserCanDefineAnalysisExtent(false);

      try {

         m_Parameters.addInputRasterLayer(LAYER, Sextante.getText("Layer"), true);

         m_Parameters.addNumericalValue(RADIUS, Sextante.getText("Radius"), AdditionalInfoNumericalValue.NUMERICAL_VALUE_INTEGER,

                  1, 1, 20);

         m_Parameters.addBoolean(FORCE_NODATA, Sextante.getText("Force_no-data_value"), true);

         addOutputRasterLayer(RESULT, this.getName());

      }

      catch (final RepeatedParameterNameException e) {

         Sextante.addErrorToLog(e);

      }

   }

   @Override

   public boolean processAlgorithm() throws GeoAlgorithmExecutionException {

      int x, y;

      int iNX, iNY;

      int iValidCells = 0;

      NO_DATA = m_OutputFactory.getDefaultNoDataValue();

      m_iRadius = m_Parameters.getParameterValueAsInt(RADIUS);

      m_window = m_Parameters.getParameterValueAsRasterLayer(LAYER);

      m_bForceNoData = m_Parameters.getParameterValueAsBoolean(FORCE_NODATA);

      m_window.setFullExtent();

      final IRasterLayer result = getNewRasterLayer(RESULT, this.getName(), IRasterLayer.RASTER_DATA_TYPE_DOUBLE,

               m_window.getWindowGridExtent());

      result.setNoDataValue(NO_DATA);

      result.assignNoData();

      iNX = m_window.getNX();

      iNY = m_window.getNY();

      m_bIsValidCell = new boolean[2 * m_iRadius + 1][2 * m_iRadius + 1];

      for (y = -m_iRadius; y < m_iRadius + 1; y++) {

         for (x = -m_iRadius; x < m_iRadius + 1; x++) {

            final double dDist = Math.sqrt(x * x + y * y);

            if (dDist <= m_iRadius) {

               m_bIsValidCell[x + m_iRadius][y + m_iRadius] = true;

               iValidCells++;

            }

            else {

               m_bIsValidCell[x + m_iRadius][y + m_iRadius] = false;

            }

         }

      }

      m_dValues = new double[iValidCells];

      for (y = 0; (y < iNY) && setProgress(y, iNY); y++) {

         for (x = 0; x < iNX; x++) {

            if (setNeighborhoodValues(x, y)) {

               result.setCellValue(x, y, processValues());

            }

            else {

               result.setNoData(x, y);

            }

         }

      }

      return !m_Task.isCanceled();

   }

   private boolean setNeighborhoodValues(final int iX,

                                         final int iY) {

      int x, y;

      int iCell = 0;

      double dValue;

      for (y = -m_iRadius; y < m_iRadius + 1; y++) {

         for (x = -m_iRadius; x < m_iRadius + 1; x++) {

            if (m_bIsValidCell[x + m_iRadius][y + m_iRadius]) {

               dValue = m_window.getCellValueAsDouble(iX + x, iY + y);

               if (!m_window.isNoDataValue(dValue)) {

                  m_dValues[iCell] = dValue;

               }

               else {

                  if (m_bForceNoData) {

                     return false;

                  }

                  else {

                     m_dValues[iCell] = NO_DATA;

                  }

               }

               iCell++;

            }

         }

      }

      return true;

   }

   protected abstract double processValues();

}