tim@544: /**
tim@544:  *
tim@544:  */
tim@544: package de.intevation.gnv.geobackend.sde.datasources;
tim@544: 
tim@544: import com.vividsolutions.jts.geom.Coordinate;
tim@544: import com.vividsolutions.jts.geom.Envelope;
tim@544: 
tim@544: /**
tim@544:  * @author Tim Englich <tim.englich@intevation.de>
tim@544:  *
tim@544:  */
tim@544: public class RasterObject {
tim@544: 
tim@544:     private int rasterSize;
tim@544:     private int rowIndex;
tim@544:     private int columnIndex;
tim@544:     private int rasterWidth;
tim@544:     private int rasterHeight;
tim@544:     private Envelope envelope = null;
tim@544:     private Envelope rasterEnvelope = null;
tim@544:     
tim@544:     private double[] rasterData = null;
tim@544:     /**
tim@544:      * Constructor
tim@544:      */
tim@544:     public RasterObject(Envelope envelope , double[] rasterData, 
tim@544:                         int rasterSize, int rowIndex, 
tim@544:                         int columnIndex, int rasterWidth, int rasterHeight ){
tim@544:         this.envelope = envelope;
tim@544:         this.rasterData = rasterData;
tim@544:         this.rasterSize = rasterSize;
tim@544:         this.rowIndex = rowIndex;
tim@544:         this.columnIndex = columnIndex;
tim@544:         this.rasterHeight = rasterHeight;
tim@544:         this.rasterWidth = rasterWidth;
tim@544:     }
tim@544:     public synchronized Envelope getEnvelope() {
tim@544:         if (this.rasterEnvelope == null){
tim@544:             double minX = (columnIndex* rasterSize * 
tim@544:                           (envelope.getWidth() / rasterWidth)+ envelope.getMinX());
tim@544:             double maxX = minX + (rasterSize * (envelope.getWidth() / rasterWidth));
tim@544:             
tim@544:             double maxY = envelope.getMaxY() - 
tim@544:                           (rowIndex * rasterSize * 
tim@544:                           (envelope.getHeight() / rasterHeight));
tim@544:             double minY = maxY - 
tim@544:                           (rasterSize * (envelope.getHeight() / rasterHeight));
tim@544:             this.rasterEnvelope = new Envelope(
tim@544:                     new Coordinate(minX, minY), 
tim@544:                     new Coordinate(maxX, maxY));
tim@544:         }
tim@544:         return this.rasterEnvelope;
tim@544:     }
tim@544:     
tim@544:     public synchronized double getValue(Coordinate coordinate){
tim@544:         double dxNature = coordinate.x - envelope.getMinX();
tim@544:         double dyNature = envelope.getMaxY() - coordinate.y;
tim@544:         double widthNature = envelope.getMaxX()-envelope.getMinX(); 
tim@544:         double heightNature = envelope.getMaxY()-envelope.getMinY();
tim@544:         
tim@544:         int pixelX = (int)Math.round(dxNature * rasterWidth / widthNature);
tim@544:         int pixelY = (int)Math.round(dyNature * rasterHeight/ heightNature);
tim@544:         
tim@544:         
tim@544:         int localPixelX = pixelX - (columnIndex*rasterSize);
tim@544:         int localPixelY = pixelY - (rowIndex*rasterSize);
tim@544:         
tim@544:         int pos = localPixelY * rasterSize + localPixelX;
tim@544:         
tim@544:         
tim@544:         if (pos < rasterData.length){
tim@544:             return this.rasterData[pos];
tim@544:         }
tim@544:         
tim@544:         return Double.NaN;
tim@544:     }
tim@544: 
tim@544: }