Mercurial > dive4elements > gnv-client
diff 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 |
parents | |
children | 347c84467478 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/geo-backend/src/main/java/de/intevation/gnv/geobackend/sde/datasources/RasterObject.java Tue Jan 05 14:09:53 2010 +0000 @@ -0,0 +1,79 @@ +/** + * + */ +package de.intevation.gnv.geobackend.sde.datasources; + +import com.vividsolutions.jts.geom.Coordinate; +import com.vividsolutions.jts.geom.Envelope; + +/** + * @author Tim Englich <tim.englich@intevation.de> + * + */ +public class RasterObject { + + private int rasterSize; + private int rowIndex; + private int columnIndex; + private int rasterWidth; + private int rasterHeight; + private Envelope envelope = null; + private Envelope rasterEnvelope = null; + + private double[] rasterData = null; + /** + * Constructor + */ + public RasterObject(Envelope envelope , double[] rasterData, + int rasterSize, int rowIndex, + int columnIndex, int rasterWidth, int rasterHeight ){ + this.envelope = envelope; + this.rasterData = rasterData; + this.rasterSize = rasterSize; + this.rowIndex = rowIndex; + this.columnIndex = columnIndex; + this.rasterHeight = rasterHeight; + this.rasterWidth = rasterWidth; + } + public synchronized Envelope getEnvelope() { + if (this.rasterEnvelope == null){ + double minX = (columnIndex* rasterSize * + (envelope.getWidth() / rasterWidth)+ envelope.getMinX()); + double maxX = minX + (rasterSize * (envelope.getWidth() / rasterWidth)); + + double maxY = envelope.getMaxY() - + (rowIndex * rasterSize * + (envelope.getHeight() / rasterHeight)); + double minY = maxY - + (rasterSize * (envelope.getHeight() / rasterHeight)); + this.rasterEnvelope = new Envelope( + new Coordinate(minX, minY), + new Coordinate(maxX, maxY)); + } + return this.rasterEnvelope; + } + + public synchronized double getValue(Coordinate coordinate){ + double dxNature = coordinate.x - envelope.getMinX(); + double dyNature = envelope.getMaxY() - coordinate.y; + double widthNature = envelope.getMaxX()-envelope.getMinX(); + double heightNature = envelope.getMaxY()-envelope.getMinY(); + + int pixelX = (int)Math.round(dxNature * rasterWidth / widthNature); + int pixelY = (int)Math.round(dyNature * rasterHeight/ heightNature); + + + int localPixelX = pixelX - (columnIndex*rasterSize); + int localPixelY = pixelY - (rowIndex*rasterSize); + + int pos = localPixelY * rasterSize + localPixelX; + + + if (pos < rasterData.length){ + return this.rasterData[pos]; + } + + return Double.NaN; + } + +}