sascha@436: package de.intevation.gnv.raster;
sascha@436: 
sascha@436: import java.util.List;
sascha@436: import java.util.HashMap;
sascha@436: 
sascha@436: import gnu.trove.TDoubleArrayList;
sascha@436: 
sascha@436: import de.intevation.gnv.raster.Vectorizer.RingsHandler;
sascha@436: import de.intevation.gnv.raster.Vectorizer.Edge;
sascha@436: 
sascha@436: import de.intevation.gnv.jfreechart.PolygonSeries;
sascha@436: import de.intevation.gnv.jfreechart.PolygonDataset;
sascha@436: import de.intevation.gnv.jfreechart.CompactXYItems;
sascha@436: 
sascha@437: /**
sascha@437:  * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
sascha@437:  */
sascha@436: public class PolygonDatasetProducer
sascha@436: implements   RingsHandler
sascha@436: {
sascha@436:     protected double minX;
sascha@436:     protected double minY;
sascha@436:     protected double maxX;
sascha@436:     protected double maxY;
sascha@436: 
sascha@436:     protected HashMap<Integer, PolygonSeries> polygonSeries;
sascha@436: 
sascha@436:     protected PolygonDatasetProducer() {
sascha@436:     }
sascha@436: 
sascha@436:     public PolygonDatasetProducer(
sascha@436:         double minX, double minY,
sascha@436:         double maxX, double maxY
sascha@436: 
sascha@436:     ) {
sascha@436:         this.minX = minX;
sascha@436:         this.minY = minY;
sascha@436:         this.maxX = maxX;
sascha@436:         this.maxY = maxY;
sascha@436: 
sascha@436:         polygonSeries = new HashMap<Integer, PolygonSeries>();
sascha@436:     }
sascha@436: 
sascha@436:     public void handleRings(
sascha@436:         List<Edge> rings, 
sascha@436:         int        value, 
sascha@436:         int        width,
sascha@436:         int        height
sascha@436:     ) {
sascha@436:         if (value == -1) {
sascha@436:             return;
sascha@436:         }
sascha@436: 
sascha@436:         Integer v = Integer.valueOf(value);
sascha@436: 
sascha@436:         PolygonSeries ps = (PolygonSeries)polygonSeries.get(v);
sascha@436: 
sascha@436:         if (ps == null) {
sascha@436:             polygonSeries.put(v, ps = new PolygonSeries());
sascha@436:             ps.setAttribute("fill", v);
sascha@436:         }
sascha@436: 
sascha@436:         TDoubleArrayList vertices = new TDoubleArrayList();
sascha@436: 
sascha@436:         /* minX = 0*m1 + b1 <=> b1 = minX
sascha@436:          * maxX = (width-1)*m1 + b1
sascha@436:          * m1 = (maxX - minX)/(width-1)
sascha@436:          */
sascha@436: 
sascha@437:         double b1 = minX;
sascha@437:         double m1 = width != 1
sascha@437:            ? (maxX - minX)/(width-1)
sascha@437:            : 0d;
sascha@436: 
sascha@437:         double b2 = minY;
sascha@437:         double m2 = height != 1
sascha@437:            ? (maxY - minY)/(height-1)
sascha@437:            : 0d;
sascha@436: 
sascha@436:         for (Edge head: rings) {
sascha@436:             Edge current = head;
sascha@436:             do {
sascha@437:                 vertices.add(m1*(current.a % width) + b1);
sascha@437:                 vertices.add(m2*(current.a / width) + b2);
sascha@436:             }
sascha@437:             while ((current = current.next) != head);
sascha@436:             ps.addRing(new CompactXYItems(vertices.toNativeArray()));
sascha@436:             vertices.clear();
sascha@436:         }
sascha@436:     }
sascha@436: 
sascha@436:     public PolygonDataset getPolygonDataset() {
sascha@436:         return new PolygonDataset(polygonSeries.values());
sascha@436:     }
sascha@436: }
sascha@436: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: