Mercurial > dive4elements > gnv-client
comparison 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> |
|---|---|
| date | Tue, 05 Jan 2010 14:09:53 +0000 |
| parents | |
| children | 347c84467478 |
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| 543:fac02bf1c685 | 544:33f93898cbbf |
|---|---|
| 1 /** | |
| 2 * | |
| 3 */ | |
| 4 package de.intevation.gnv.geobackend.sde.datasources; | |
| 5 | |
| 6 import com.vividsolutions.jts.geom.Coordinate; | |
| 7 import com.vividsolutions.jts.geom.Envelope; | |
| 8 | |
| 9 /** | |
| 10 * @author Tim Englich <tim.englich@intevation.de> | |
| 11 * | |
| 12 */ | |
| 13 public class RasterObject { | |
| 14 | |
| 15 private int rasterSize; | |
| 16 private int rowIndex; | |
| 17 private int columnIndex; | |
| 18 private int rasterWidth; | |
| 19 private int rasterHeight; | |
| 20 private Envelope envelope = null; | |
| 21 private Envelope rasterEnvelope = null; | |
| 22 | |
| 23 private double[] rasterData = null; | |
| 24 /** | |
| 25 * Constructor | |
| 26 */ | |
| 27 public RasterObject(Envelope envelope , double[] rasterData, | |
| 28 int rasterSize, int rowIndex, | |
| 29 int columnIndex, int rasterWidth, int rasterHeight ){ | |
| 30 this.envelope = envelope; | |
| 31 this.rasterData = rasterData; | |
| 32 this.rasterSize = rasterSize; | |
| 33 this.rowIndex = rowIndex; | |
| 34 this.columnIndex = columnIndex; | |
| 35 this.rasterHeight = rasterHeight; | |
| 36 this.rasterWidth = rasterWidth; | |
| 37 } | |
| 38 public synchronized Envelope getEnvelope() { | |
| 39 if (this.rasterEnvelope == null){ | |
| 40 double minX = (columnIndex* rasterSize * | |
| 41 (envelope.getWidth() / rasterWidth)+ envelope.getMinX()); | |
| 42 double maxX = minX + (rasterSize * (envelope.getWidth() / rasterWidth)); | |
| 43 | |
| 44 double maxY = envelope.getMaxY() - | |
| 45 (rowIndex * rasterSize * | |
| 46 (envelope.getHeight() / rasterHeight)); | |
| 47 double minY = maxY - | |
| 48 (rasterSize * (envelope.getHeight() / rasterHeight)); | |
| 49 this.rasterEnvelope = new Envelope( | |
| 50 new Coordinate(minX, minY), | |
| 51 new Coordinate(maxX, maxY)); | |
| 52 } | |
| 53 return this.rasterEnvelope; | |
| 54 } | |
| 55 | |
| 56 public synchronized double getValue(Coordinate coordinate){ | |
| 57 double dxNature = coordinate.x - envelope.getMinX(); | |
| 58 double dyNature = envelope.getMaxY() - coordinate.y; | |
| 59 double widthNature = envelope.getMaxX()-envelope.getMinX(); | |
| 60 double heightNature = envelope.getMaxY()-envelope.getMinY(); | |
| 61 | |
| 62 int pixelX = (int)Math.round(dxNature * rasterWidth / widthNature); | |
| 63 int pixelY = (int)Math.round(dyNature * rasterHeight/ heightNature); | |
| 64 | |
| 65 | |
| 66 int localPixelX = pixelX - (columnIndex*rasterSize); | |
| 67 int localPixelY = pixelY - (rowIndex*rasterSize); | |
| 68 | |
| 69 int pos = localPixelY * rasterSize + localPixelX; | |
| 70 | |
| 71 | |
| 72 if (pos < rasterData.length){ | |
| 73 return this.rasterData[pos]; | |
| 74 } | |
| 75 | |
| 76 return Double.NaN; | |
| 77 } | |
| 78 | |
| 79 } |