Mercurial > dive4elements > river

comparison flys-artifacts/src/main/java/de/intevation/flys/exports/ChartHelper.java @ 2424:092e519ff461

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merged flys-artifacts/2.6.1
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:26 +0200
parents 02ac373b6d69
children bece6f604899
comparison
equal deleted inserted replaced
2392:8112ec686a9a 2424:092e519ff461
1 package de.intevation.flys.exports;
2
3 import org.jfree.data.Range;
4 import org.jfree.data.xy.XYDataset;
5 import org.jfree.data.time.RegularTimePeriod;
6 import org.jfree.data.time.TimeSeriesCollection;
7 import org.jfree.data.time.TimeSeries;
8
9 import org.apache.log4j.Logger;
10
11 import de.intevation.flys.jfree.Bounds;
12 import de.intevation.flys.jfree.DoubleBounds;
13 import de.intevation.flys.jfree.TimeBounds;
14
15
16 /**
17 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
18 */
19 public class ChartHelper {
20
21 private static final Logger logger = Logger.getLogger(ChartHelper.class);
22
23
24 /**
25 * This method returns the ranges of the XYDataset <i>dataset</i> as array
26 * with [xrange, yrange].
27 *
28 * @param dataset The dataset which should be evaluated.
29 *
30 * @return an array with x and y ranges.
31 */
32 public static Range[] getRanges(XYDataset dataset) {
33 int seriesCount = dataset != null ? dataset.getSeriesCount() : 0;
34
35 if (seriesCount == 0) {
36 logger.warn("Dataset is empty or has no Series set.");
37 return null;
38 }
39
40 boolean foundValue = false;
41
42 double minX = Double.MAX_VALUE;
43 double maxX = -Double.MAX_VALUE;
44 double minY = Double.MAX_VALUE;
45 double maxY = -Double.MAX_VALUE;
46
47 for (int i = 0, m = seriesCount; i < m; i++) {
48 for (int j = 0, n = dataset.getItemCount(i); j < n; j++) {
49 double x = dataset.getXValue(i, j);
50 double y = dataset.getYValue(i, j);
51
52 if (Double.isNaN(x) || Double.isNaN(y)) {
53 logger.warn("Item " + j + " in Series " + i + " is broken");
54 continue;
55 }
56
57 foundValue = true;
58
59 if (x < minX) {
60 minX = x;
61 }
62
63 if (x > maxX) {
64 maxX = x;
65 }
66
67 if (y < minY) {
68 minY = y;
69 }
70
71 if (y > maxY) {
72 maxY = y;
73 }
74 }
75 }
76
77 return foundValue
78 ? new Range[] { new Range(minX, maxX), new Range(minY, maxY) }
79 : null;
80 }
81
82
83 public static Bounds[] getBounds(TimeSeriesCollection collection) {
84 int seriesCount = collection != null ? collection.getSeriesCount() : 0;
85
86 if (seriesCount == 0) {
87 logger.warn("TimeSeriesCollection is empty or has no Series set.");
88 return null;
89 }
90
91 boolean foundValue = false;
92
93 long lowerX = Long.MAX_VALUE;
94 long upperX = -Long.MAX_VALUE;
95
96 double lowerY = Double.MAX_VALUE;
97 double upperY = -Double.MAX_VALUE;
98
99 for (int i = 0, m = seriesCount; i < m; i++) {
100 TimeSeries series = collection.getSeries(i);
101
102 for (int j = 0, n = collection.getItemCount(i); j < n; j++) {
103 RegularTimePeriod rtp = series.getTimePeriod(j);
104
105 if (rtp == null) {
106 continue;
107 }
108
109 foundValue = true;
110
111 long start = rtp.getFirstMillisecond();
112 long end = rtp.getLastMillisecond();
113
114 if (start < lowerX) {
115 lowerX = start;
116 }
117
118 if (end > upperX) {
119 upperX = end;
120 }
121
122 double y = series.getValue(j).doubleValue();
123
124 lowerY = Math.min(lowerY, y);
125 upperY = Math.max(upperY, y);
126 }
127 }
128
129 if (foundValue) {
130 return new Bounds[] {
131 new TimeBounds(lowerX, upperX),
132 new DoubleBounds(lowerY, upperY)
133 };
134 }
135
136 return null;
137 }
138
139
140 /**
141 * Expand range by percent.
142 *
143 * @param range The range to expand.
144 * @param percent The percentage to expand.
145 *
146 * @param an expanded range.
147 */
148 public static Range expandRange(Range range, double percent) {
149 if (range == null) {
150 return null;
151 }
152
153 double value = range.getLowerBound();
154 double expand = Math.abs(value / 100 * percent);
155
156 return expand != 0
157 ? new Range(value-expand, value+expand)
158 : new Range(-0.01 * percent, 0.01 * percent);
159 }
160 }
161 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
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