gvsig-raster / org.gvsig.raster / trunk / org.gvsig.raster / org.gvsig.raster.lib / org.gvsig.raster.lib.impl / src / main / java / org / gvsig / raster / impl / grid / GridInterpolated.java @ 2438
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/*******************************************************************************
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GridWrapperInterpolated
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Copyright (C) Victor Olaya
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*******************************************************************************/
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package org.gvsig.raster.impl.grid; |
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import java.awt.Rectangle; |
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import org.gvsig.fmap.dal.coverage.dataset.Buffer; |
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import org.gvsig.fmap.dal.coverage.datastruct.GridExtent; |
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import org.gvsig.fmap.dal.coverage.exception.ProcessInterruptedException; |
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import org.gvsig.fmap.dal.coverage.exception.QueryException; |
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import org.gvsig.fmap.dal.coverage.exception.RasterBufferInvalidAccessException; |
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import org.gvsig.fmap.dal.coverage.exception.RasterBufferInvalidException; |
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import org.gvsig.fmap.dal.coverage.store.RasterDataStore; |
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import org.gvsig.fmap.dal.coverage.store.RasterQuery; |
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import org.gvsig.raster.impl.DefaultRasterManager; |
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/**
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* A grid wrapper that performs interpolation to calculate
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* cell values. This should be used when the window extent
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* does not 'fit' into the structure (coordinates and cellsize)
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* of the grid.
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*
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* @author Victor Olaya
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*/
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public class GridInterpolated extends GridReader { |
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public static final int INTERPOLATION_NearestNeighbour = Buffer.INTERPOLATION_NearestNeighbour; |
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public static final int INTERPOLATION_Bilinear = Buffer.INTERPOLATION_Bilinear; |
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public static final int INTERPOLATION_InverseDistance = Buffer.INTERPOLATION_InverseDistance; |
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public static final int INTERPOLATION_BicubicSpline = Buffer.INTERPOLATION_BicubicSpline; |
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public static final int INTERPOLATION_BSpline = Buffer.INTERPOLATION_BSpline; |
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double m_dXMin , m_dYMax; //coordinates of the layer, not the window |
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double m_dCellSizeX; //cellsize of the layer, not the window |
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double m_dCellSizeY; //cellsize of the layer, not the window |
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int m_iInterpolationMethod = INTERPOLATION_BSpline;
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/**
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* Crea un objeto lector a partir de un buffer de datos y el extent de la extensi?n
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* completa y de la ventana accedida.
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* @param rb Buffer de datos
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* @param layerExtent extent de la capa completa
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* @param windowExtent Extent
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* @param bands N?mero de bandas del origen
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*/
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public GridInterpolated( Buffer rb, |
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GridExtent layerExtent, |
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GridExtent windowExtent, |
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int[] bands){ |
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super(rb, layerExtent, windowExtent, bands);
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m_dXMin = layerExtent.minX(); |
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m_dYMax = layerExtent.maxY(); |
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m_dCellSizeX = layerExtent.getCellSizeX(); |
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m_dCellSizeY = layerExtent.getCellSizeY(); |
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} |
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/**
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* Crea un objeto lector a partir de una fuente de datos y el extent de la extensi?n
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* completa y de la ventana accedida.
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* @param ds Fuente de datos
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* @param layerExtent extent de la capa completa
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* @param windowExtent Extent
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* @param bands N?mero de bandas del origen
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*/
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public GridInterpolated( RasterDataStore ds,
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GridExtent layerExtent, |
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GridExtent windowExtent, |
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int[] bands){ |
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super(ds, layerExtent, windowExtent, bands);
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init(); |
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} |
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/**
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* Inicializaci?n de la fuente de datos y carga del buffer.
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*/
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private void init(){ |
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m_dXMin = dataStore.getExtent().minX(); |
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m_dYMax = dataStore.getExtent().maxY(); |
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m_dCellSizeX = dataStore.getAffineTransform().getScaleX(); |
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m_dCellSizeY = dataStore.getAffineTransform().getScaleY(); |
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} |
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/**
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* Asigna el m?todo de interpolaci?n
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* @param iMethod
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*/
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public void setInterpolationMethod(int iMethod){ |
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m_iInterpolationMethod = iMethod; |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.grid.GridReader#getCellValueAsByte(int, int)
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*/
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public byte getCellValueAsByte(int x, int y) throws RasterBufferInvalidAccessException, RasterBufferInvalidException { |
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return (byte)_getValueAt(x, y); |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.grid.GridReader#getCellValueAsShort(int, int)
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*/
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public short getCellValueAsShort(int x, int y) throws RasterBufferInvalidAccessException, RasterBufferInvalidException { |
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return (short) _getValueAt(x, y); |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.grid.GridReader#getCellValueAsInt(int, int)
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*/
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public int getCellValueAsInt(int x, int y) throws RasterBufferInvalidAccessException, RasterBufferInvalidException { |
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return (int) _getValueAt(x, y); |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.grid.GridReader#getCellValueAsFloat(int, int)
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*/
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public float getCellValueAsFloat(int x, int y) throws RasterBufferInvalidAccessException, RasterBufferInvalidException { |
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return (float) _getValueAt(x, y); |
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.grid.GridReader#getCellValueAsDouble(int, int)
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*/
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public double getCellValueAsDouble(int x, int y) throws RasterBufferInvalidAccessException, RasterBufferInvalidException { |
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return _getValueAt(x, y);
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} |
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/*
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* (non-Javadoc)
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* @see org.gvsig.fmap.grid.GridReader#getCellValueAsDouble(int, int)
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*/
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public double getCellValue(int x, int y) throws RasterBufferInvalidAccessException, RasterBufferInvalidException { |
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return _getValueAt(x, y);
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} |
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private double _getValueAt(int x, int y) throws RasterBufferInvalidAccessException, RasterBufferInvalidException { |
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double dX = windowExtent.minX() + windowExtent.getCellSize() * (x + 0.5); |
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double dY = windowExtent.maxY() - windowExtent.getCellSize() * (y + 0.5); |
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return getValueAt(dX, dY);
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} |
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/** Devuelve el valor interpolado para unas coordenadas de la imagen no enteras
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* la distancia se toma al vertice superior izquierdo del pixel
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* */
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public double _getValueAt(double x, double y) throws RasterBufferInvalidAccessException, RasterBufferInvalidException { |
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int x_int, y_int;
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x_int= (int)Math.floor(x); |
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y_int= (int)Math.floor(y); |
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double dX = windowExtent.minX() + windowExtent.getCellSize() * (x_int + (x-x_int));
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double dY = windowExtent.maxY() - windowExtent.getCellSize() * (y_int + (y-y_int));
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return getValueAt(dX, dY);
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} |
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private double getValueAt(double xPosition, double yPosition) throws RasterBufferInvalidAccessException, RasterBufferInvalidException { |
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int x, y;
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double dx, dy;
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double dValue;
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x = (int) Math.floor(xPosition = (xPosition - m_dXMin) / m_dCellSizeX); |
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y = (int) Math.floor(yPosition = (yPosition - m_dYMax) / m_dCellSizeY); |
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dValue = _getCellValueInLayerCoords(x, y); |
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if( !isNoDataValue(dValue) ) {
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dx = xPosition - x; |
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dy = yPosition - y; |
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switch( m_iInterpolationMethod ) {
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case INTERPOLATION_NearestNeighbour:
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dValue = _getValueNearestNeighbour (x, y, dx, dy); |
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break;
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case INTERPOLATION_Bilinear:
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dValue = _getValueBiLinear (x, y, dx, dy); |
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break;
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case INTERPOLATION_InverseDistance:
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dValue = _getValueInverseDistance(x, y, dx, dy); |
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break;
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case INTERPOLATION_BicubicSpline:
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dValue = _getValueBiCubicSpline (x, y, dx, dy); |
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break;
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case INTERPOLATION_BSpline:
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dValue = _getValueBSpline (x, y, dx, dy); |
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break;
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} |
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} else {
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dValue = getNoDataValue(); |
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} |
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return dValue;
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} |
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private double _getValueNearestNeighbour(int x, int y, double dx, double dy) throws RasterBufferInvalidAccessException, RasterBufferInvalidException { |
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x += (int)(0.5 + dx); |
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y += (int)(0.5 + dy); |
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return _getCellValueInLayerCoords(x, y);
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} |
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private double _getValueBiLinear(int x, int y, double dx, double dy) throws RasterBufferInvalidAccessException, RasterBufferInvalidException { |
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double z = 0.0, n = 0.0, d; |
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double dValue;
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dValue = _getCellValueInLayerCoords(x, y); |
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if (!isNoDataValue(dValue)){
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d = (1.0 - dx) * (1.0 - dy); |
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z += d * dValue; |
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n += d; |
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} |
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dValue = _getCellValueInLayerCoords(x + 1, y);
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if (!isNoDataValue(dValue)){
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d = (dx) * (1.0 - dy);
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z += d * dValue; |
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n += d; |
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} |
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dValue = _getCellValueInLayerCoords(x, y + 1);
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if (!isNoDataValue(dValue)){
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d = (1.0 - dx) * (dy);
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z += d * dValue; |
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n += d; |
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} |
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dValue = _getCellValueInLayerCoords(x + 1, y + 1); |
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if (!isNoDataValue(dValue)){
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d = (dx) * (dy); |
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z += d * dValue; |
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n += d; |
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} |
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if( n > 0.0 ){ |
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return( z / n );
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} |
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return( getNoDataValue() );
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} |
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private double _getValueInverseDistance(int x, int y, double dx, double dy) throws RasterBufferInvalidAccessException, RasterBufferInvalidException { |
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double z = 0.0, n = 0.0, d; |
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double dValue;
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if( dx > 0.0 || dy > 0.0 ){ |
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dValue = _getCellValueInLayerCoords(x, y); |
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if (!isNoDataValue(dValue)){
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d = 1.0 / Math.sqrt(dx*dx + dy*dy); |
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z += d * dValue; |
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n += d; |
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} |
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dValue = _getCellValueInLayerCoords(x + 1, y);
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if (!isNoDataValue(dValue)){
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d = 1.0 / Math.sqrt((1.0-dx)*(1.0-dx) + dy*dy); |
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z += d * dValue; |
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n += d; |
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} |
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dValue = _getCellValueInLayerCoords(x, y + 1);
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if (!isNoDataValue(dValue)){
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d = 1.0 / Math.sqrt(dx*dx + (1.0-dy)*(1.0-dy)); |
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z += d * dValue; |
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n += d; |
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} |
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dValue = _getCellValueInLayerCoords(x + 1, y + 1); |
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if (!isNoDataValue(dValue)){
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d = 1.0 / Math.sqrt((1.0-dx)*(1.0-dx) + (1.0-dy)*(1.0-dy)); |
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z += d * dValue; |
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n += d; |
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} |
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if( n > 0.0 ){ |
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return( z / n );
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} |
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}else
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return( _getCellValueInLayerCoords(x, y) );
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return( getNoDataValue());
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} |
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private double _getValueBiCubicSpline(int x, int y, double dx, double dy) throws RasterBufferInvalidAccessException, RasterBufferInvalidException { |
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int i;
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double a0, a2, a3, b1, b2, b3, c[], z_xy[][]; |
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c = new double[4]; |
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z_xy = new double[4][4]; |
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if( _get4x4Submatrix(x, y, z_xy) ){
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for(i=0; i<4; i++){ |
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a0 = z_xy[0][i] - z_xy[1][i]; |
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a2 = z_xy[2][i] - z_xy[1][i]; |
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a3 = z_xy[3][i] - z_xy[1][i]; |
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b1 = -a0 / 3.0 + a2 - a3 / 6.0; |
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b2 = a0 / 2.0 + a2 / 2.0; |
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b3 = -a0 / 6.0 - a2 / 2.0 + a3 / 6.0; |
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c[i] = z_xy[1][i] + b1 * dx + b2 * dx*dx + b3 * dx*dx*dx;
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} |
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a0 = c[0] - c[1]; |
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a2 = c[2] - c[1]; |
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a3 = c[3] - c[1]; |
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b1 = -a0 / 3.0 + a2 - a3 / 6.0; |
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b2 = a0 / 2.0 + a2 / 2.0; |
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b3 = -a0 / 6.0 - a2 / 2.0 + a3 / 6.0; |
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return( c[1] + b1 * dy + b2 * dy*dy + b3 * dy*dy*dy ); |
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} |
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return( _getValueBiLinear(x, y, dx, dy) );
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} |
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private double _getValueBSpline(int x, int y, double dx, double dy) throws RasterBufferInvalidAccessException, RasterBufferInvalidException { |
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int i, ix, iy;
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double z, px, py, Rx[], Ry[], z_xy[][]; |
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Rx = new double[4]; |
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Ry = new double[4]; |
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z_xy = new double [4][4]; |
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if( _get4x4Submatrix(x, y, z_xy) ) {
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for(i=0, px=-1.0-dx, py=-1.0-dy; i<4; i++, px++, py++) { |
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Rx[i] = 0.0;
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Ry[i] = 0.0;
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if( (z = px + 2.0) > 0.0 ) |
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Rx[i] += z*z*z; |
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if( (z = px + 1.0) > 0.0 ) |
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Rx[i] += -4.0 * z*z*z;
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if( (z = px + 0.0) > 0.0 ) |
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Rx[i] += 6.0 * z*z*z;
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if( (z = px - 1.0) > 0.0 ) |
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Rx[i] += -4.0 * z*z*z;
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if( (z = py + 2.0) > 0.0 ) |
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Ry[i] += z*z*z; |
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if( (z = py + 1.0) > 0.0 ) |
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Ry[i] += -4.0 * z*z*z;
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if( (z = py + 0.0) > 0.0 ) |
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Ry[i] += 6.0 * z*z*z;
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if( (z = py - 1.0) > 0.0 ) |
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Ry[i] += -4.0 * z*z*z;
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Rx[i] /= 6.0;
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Ry[i] /= 6.0;
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} |
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for(iy=0, z=0.0; iy<4; iy++) { |
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for(ix=0; ix<4; ix++){ |
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z += z_xy[ix][iy] * Rx[ix] * Ry[iy]; |
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} |
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} |
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return( z );
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} |
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return( _getValueBiLinear(x, y, dx, dy) );
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} |
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private boolean _get4x4Submatrix(int x, int y, double z_xy[][]) throws RasterBufferInvalidAccessException, RasterBufferInvalidException { |
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int ix, iy, px, py;
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double dValue;
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for(iy=0, py=y-1; iy<4; iy++, py++) { |
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for(ix=0, px=x-1; ix<4; ix++, px++) { |
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dValue = _getCellValueInLayerCoords(px, py); |
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if (isNoDataValue(dValue)) {
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return false; |
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} else {
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z_xy[ix][iy] = dValue; |
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} |
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} |
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} |
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return( true ); |
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} |
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private double _getCellValueInLayerCoords(int x, int y) throws RasterBufferInvalidAccessException, RasterBufferInvalidException { |
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int w, h;
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int pX = 0, pY = 0; |
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RasterQuery query = DefaultRasterManager.getInstance().createQuery(); |
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query.setDrawableBands(bands); |
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query.storeLastBuffer(true);
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if (dataStore != null) { |
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w = (int)dataStore.getWidth();
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h = (int)dataStore.getHeight();
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try {
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if (y >= h || x >= w || x < 0 || y < 0) |
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return getNoDataValue();
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query.setAreaOfInterest(new Rectangle(x, y, 1, 1)); |
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rasterBuf = dataStore.query(query); |
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} catch (QueryException e) {
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throw new RasterBufferInvalidAccessException(""); |
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} catch (ProcessInterruptedException e) {
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// La cancelaci?n de la lectura de un pixel no es significativa
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} |
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} else {
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w = rasterBuf.getWidth(); |
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h = rasterBuf.getHeight(); |
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pX = x; |
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pY = y; |
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} |
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if (x >= 0 && y >= 0 && x < w && y < h) { |
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switch (dataType) {
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case Buffer.TYPE_DOUBLE: |
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return rasterBuf.getElemDouble(pY, pX, bandToOperate);
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| 438 |
case Buffer.TYPE_INT: |
| 439 |
return (double) rasterBuf.getElemInt(pY, pX, bandToOperate); |
| 440 |
case Buffer.TYPE_FLOAT: |
| 441 |
return (double) rasterBuf.getElemFloat(pY, pX, bandToOperate); |
| 442 |
case Buffer.TYPE_BYTE: |
| 443 |
return ((byte) (rasterBuf.getElemByte(pY, pX, bandToOperate)) & 0xff); |
| 444 |
case Buffer.TYPE_SHORT: |
| 445 |
case Buffer.TYPE_USHORT: |
| 446 |
return (double) rasterBuf.getElemShort(pY, pX, bandToOperate); |
| 447 |
} |
| 448 |
} |
| 449 |
return getNoDataValue();
|
| 450 |
} |
| 451 |
|
| 452 |
public byte[] getBandsValuesAsByte(int x, int y) { |
| 453 |
//TODO: FUNCIONALIDAD: getBandsValuesAsByte:Obtener los valores interpolados en todas las bandas
|
| 454 |
return null; |
| 455 |
} |
| 456 |
|
| 457 |
public short[] getBandsValuesAsShort(int x, int y) { |
| 458 |
//TODO: FUNCIONALIDAD: getBandsValuesAsShort:Obtener los valores interpolados en todas las bandas
|
| 459 |
return null; |
| 460 |
} |
| 461 |
|
| 462 |
public int[] getBandsValuesAsInt(int x, int y) { |
| 463 |
//TODO: FUNCIONALIDAD: getBandsValuesAsInt:Obtener los valores interpolados en todas las bandas
|
| 464 |
return null; |
| 465 |
} |
| 466 |
|
| 467 |
public float[] getBandsValuesAsFloat(int x, int y) { |
| 468 |
//TODO: FUNCIONALIDAD: getBandsValuesAsFloat:Obtener los valores interpolados en todas las bandas
|
| 469 |
return null; |
| 470 |
} |
| 471 |
|
| 472 |
public double[] getBandsValuesAsDouble(int x, int y) { |
| 473 |
//TODO: FUNCIONALIDAD: getBandsValuesAsDouble:Obtener los valores interpolados en todas las bandas
|
| 474 |
return null; |
| 475 |
} |
| 476 |
} |