Mercurial > dive4elements > gnv-client
view gnv-artifacts/src/main/java/de/intevation/gnv/raster/PolygonDatasetProducer.java @ 1034:50a5ce7a47b7
Implemented an odv exporter for product type 'Horizontales Schnittprofil' (issue260).
gnv-artifacts/trunk@1082 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Mon, 10 May 2010 10:29:55 +0000 |
parents | feae2f9d6c6f |
children | f953c9a559d8 |
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package de.intevation.gnv.raster; import de.intevation.gnv.jfreechart.CompactXYItems; import de.intevation.gnv.jfreechart.PolygonDataset; import de.intevation.gnv.jfreechart.PolygonSeries; import de.intevation.gnv.raster.Vectorizer.Edge; import gnu.trove.TDoubleArrayList; import java.util.HashMap; import java.util.List; /** * Vectorizer backend to produce polygon datasets suitable to being * displayed with {@link de.intevation.gnv.jfreechart.PolygonPlot}. * * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> */ public class PolygonDatasetProducer extends AbstractProducer { /** * Maps value integers to series of polygons to group * them by value. */ protected HashMap<Integer, PolygonSeries> polygonSeries; /** * Default constructor. */ protected PolygonDatasetProducer() { } /** * Constructor to create a PolygonDatasetProducer with * a given world bound box. * @param minX Min x coord of the world. * @param minY Min y coord of the world. * @param maxX Max x coord of the world. * @param maxY Max y coord of the world. */ public PolygonDatasetProducer( double minX, double minY, double maxX, double maxY ) { super(minX, minY, maxX, maxY); polygonSeries = new HashMap<Integer, PolygonSeries>(); } public void handleRings( List<Edge> rings, int value, int width, int height ) { if (value == -1) { return; } Integer v = Integer.valueOf(value); PolygonSeries ps = polygonSeries.get(v); if (ps == null) { polygonSeries.put(v, ps = new PolygonSeries()); ps.setAttribute("fill", v); } TDoubleArrayList vertices = new TDoubleArrayList(); /* minX = 0*m1 + b1 <=> b1 = minX * maxX = (width-1)*m1 + b1 * m1 = (maxX - minX)/(width-1) */ double b1 = minX; double m1 = width != 1 ? (maxX - minX)/(width-1) : 0d; double b2 = minY; double m2 = height != 1 ? (maxY - minY)/(height-1) : 0d; for (Edge head: rings) { Edge current = head; do { vertices.add(m1*(current.a % width) + b1); vertices.add(m2*(current.a / width) + b2); } while ((current = current.next) != head); ps.addRing(new CompactXYItems(vertices.toNativeArray())); vertices.reset(); } } /** * Creates a new PolygonDataset from the polygons build by this * backend. * @return the new PolygonDataset */ public PolygonDataset getPolygonDataset() { return new PolygonDataset(polygonSeries.values()); } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :