Mercurial > dive4elements > gnv-client
annotate geo-backend/src/main/java/de/intevation/gnv/geobackend/sde/datasources/RasterObject.java @ 544:33f93898cbbf
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> |
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date | Tue, 05 Jan 2010 14:09:53 +0000 |
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children | 347c84467478 |
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544
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Added RasterObject for caching the Rastertiles to get a better performance
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1 /** |
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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 } |