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 |
comparison
equal
deleted
inserted
replaced
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: |