Mercurial > dive4elements > gnv-client
comparison gnv-artifacts/src/main/java/de/intevation/gnv/raster/PolygonDatasetProducer.java @ 436:6642ab6c583c
Added vectorizer rings callback which generates polygon datasets suitable
for polygon plots.
gnv-artifacts/trunk@484 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Sat, 26 Dec 2009 15:32:08 +0000 |
| parents | |
| children | b624879d2902 |
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| 435:67091b17462d | 436:6642ab6c583c |
|---|---|
| 1 package de.intevation.gnv.raster; | |
| 2 | |
| 3 import java.util.List; | |
| 4 import java.util.HashMap; | |
| 5 | |
| 6 import gnu.trove.TDoubleArrayList; | |
| 7 | |
| 8 import de.intevation.gnv.raster.Vectorizer.RingsHandler; | |
| 9 import de.intevation.gnv.raster.Vectorizer.Edge; | |
| 10 | |
| 11 import de.intevation.gnv.jfreechart.PolygonSeries; | |
| 12 import de.intevation.gnv.jfreechart.PolygonDataset; | |
| 13 import de.intevation.gnv.jfreechart.CompactXYItems; | |
| 14 | |
| 15 public class PolygonDatasetProducer | |
| 16 implements RingsHandler | |
| 17 { | |
| 18 protected double minX; | |
| 19 protected double minY; | |
| 20 | |
| 21 protected double maxX; | |
| 22 protected double maxY; | |
| 23 | |
| 24 protected HashMap<Integer, PolygonSeries> polygonSeries; | |
| 25 | |
| 26 protected PolygonDatasetProducer() { | |
| 27 } | |
| 28 | |
| 29 public PolygonDatasetProducer( | |
| 30 double minX, double minY, | |
| 31 double maxX, double maxY | |
| 32 | |
| 33 ) { | |
| 34 this.minX = minX; | |
| 35 this.minY = minY; | |
| 36 this.maxX = maxX; | |
| 37 this.maxY = maxY; | |
| 38 | |
| 39 polygonSeries = new HashMap<Integer, PolygonSeries>(); | |
| 40 } | |
| 41 | |
| 42 public void handleRings( | |
| 43 List<Edge> rings, | |
| 44 int value, | |
| 45 int width, | |
| 46 int height | |
| 47 ) { | |
| 48 if (value == -1) { | |
| 49 return; | |
| 50 } | |
| 51 | |
| 52 Integer v = Integer.valueOf(value); | |
| 53 | |
| 54 PolygonSeries ps = (PolygonSeries)polygonSeries.get(v); | |
| 55 | |
| 56 if (ps == null) { | |
| 57 polygonSeries.put(v, ps = new PolygonSeries()); | |
| 58 ps.setAttribute("fill", v); | |
| 59 } | |
| 60 | |
| 61 TDoubleArrayList vertices = new TDoubleArrayList(); | |
| 62 | |
| 63 /* minX = 0*m1 + b1 <=> b1 = minX | |
| 64 * maxX = (width-1)*m1 + b1 | |
| 65 * m1 = (maxX - minX)/(width-1) | |
| 66 */ | |
| 67 | |
| 68 double b1 = minX; | |
| 69 double m1 = width != 1 | |
| 70 ? (maxX - minX)/(width-1) | |
| 71 : 0d; | |
| 72 | |
| 73 double b2 = minY; | |
| 74 double m2 = height != 1 | |
| 75 ? (maxY - minY)/(height-1) | |
| 76 : 0d; | |
| 77 | |
| 78 for (Edge head: rings) { | |
| 79 Edge current = head; | |
| 80 do { | |
| 81 double x = m1*(current.a % width) + b1; | |
| 82 double y = m2*(current.a / width) + b2; | |
| 83 vertices.add(x); | |
| 84 vertices.add(y); | |
| 85 current = current.next; | |
| 86 } | |
| 87 while (current != head); | |
| 88 ps.addRing(new CompactXYItems(vertices.toNativeArray())); | |
| 89 vertices.clear(); | |
| 90 } | |
| 91 } | |
| 92 | |
| 93 public PolygonDataset getPolygonDataset() { | |
| 94 return new PolygonDataset(polygonSeries.values()); | |
| 95 } | |
| 96 } | |
| 97 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: |