Mercurial > dive4elements > gnv-client

annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/sde/datasources/RasterObject.java @ 544:33f93898cbbf

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Added RasterObject for caching the Rastertiles to get a better performance geo-backend/trunk@508 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Tue, 05 Jan 2010 14:09:53 +0000
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children 347c84467478
rev   line source
544
33f93898cbbf Added RasterObject for caching the Rastertiles to get a better performance
Tim Englich <tim.englich@intevation.de>
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1 /**
33f93898cbbf Added RasterObject for caching the Rastertiles to get a better performance
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2 *
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3 */
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4 package de.intevation.gnv.geobackend.sde.datasources;
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5
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6 import com.vividsolutions.jts.geom.Coordinate;
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7 import com.vividsolutions.jts.geom.Envelope;
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8
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9 /**
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10 * @author Tim Englich <tim.englich@intevation.de>
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11 *
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12 */
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13 public class RasterObject {
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14
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15 private int rasterSize;
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16 private int rowIndex;
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17 private int columnIndex;
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18 private int rasterWidth;
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19 private int rasterHeight;
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20 private Envelope envelope = null;
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21 private Envelope rasterEnvelope = null;
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22
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23 private double[] rasterData = null;
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24 /**
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25 * Constructor
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26 */
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27 public RasterObject(Envelope envelope , double[] rasterData,
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28 int rasterSize, int rowIndex,
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29 int columnIndex, int rasterWidth, int rasterHeight ){
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30 this.envelope = envelope;
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31 this.rasterData = rasterData;
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32 this.rasterSize = rasterSize;
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33 this.rowIndex = rowIndex;
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34 this.columnIndex = columnIndex;
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35 this.rasterHeight = rasterHeight;
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36 this.rasterWidth = rasterWidth;
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37 }
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38 public synchronized Envelope getEnvelope() {
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39 if (this.rasterEnvelope == null){
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40 double minX = (columnIndex* rasterSize *
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41 (envelope.getWidth() / rasterWidth)+ envelope.getMinX());
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42 double maxX = minX + (rasterSize * (envelope.getWidth() / rasterWidth));
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43
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44 double maxY = envelope.getMaxY() -
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45 (rowIndex * rasterSize *
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46 (envelope.getHeight() / rasterHeight));
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47 double minY = maxY -
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48 (rasterSize * (envelope.getHeight() / rasterHeight));
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49 this.rasterEnvelope = new Envelope(
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50 new Coordinate(minX, minY),
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51 new Coordinate(maxX, maxY));
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52 }
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53 return this.rasterEnvelope;
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54 }
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55
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56 public synchronized double getValue(Coordinate coordinate){
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57 double dxNature = coordinate.x - envelope.getMinX();
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58 double dyNature = envelope.getMaxY() - coordinate.y;
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59 double widthNature = envelope.getMaxX()-envelope.getMinX();
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60 double heightNature = envelope.getMaxY()-envelope.getMinY();
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61
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62 int pixelX = (int)Math.round(dxNature * rasterWidth / widthNature);
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63 int pixelY = (int)Math.round(dyNature * rasterHeight/ heightNature);
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64
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65
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66 int localPixelX = pixelX - (columnIndex*rasterSize);
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67 int localPixelY = pixelY - (rowIndex*rasterSize);
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68
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69 int pos = localPixelY * rasterSize + localPixelX;
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70
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71
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72 if (pos < rasterData.length){
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73 return this.rasterData[pos];
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74 }
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75
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76 return Double.NaN;
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77 }
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78
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79 }
http://dive4elements.wald.intevation.org