Mercurial > dive4elements > river

comparison flys-artifacts/src/main/java/de/intevation/flys/exports/ChartHelper.java @ 2241:2b232871ba28

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
New helper functions in ChartHelper and improvements in EnhancedLineAndShapeRenderer. flys-artifacts/trunk@3889 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 03 Feb 2012 09:35:46 +0000
parents 60615235e951
children 594885703687
comparison
equal deleted inserted replaced
2240:e9173de1026c 2241:2b232871ba28
1 package de.intevation.flys.exports; 1 package de.intevation.flys.exports;
2 2
3 import org.jfree.data.Range; 3 import org.jfree.data.Range;
4 import org.jfree.data.xy.XYDataset; 4 import org.jfree.data.xy.XYDataset;
5
6 import org.apache.log4j.Logger;
5 7
6 8
7 /** 9 /**
8 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> 10 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
9 */ 11 */
10 public class ChartHelper { 12 public class ChartHelper {
13
14 private static final Logger logger = Logger.getLogger(ChartHelper.class);
15
11 16
12 /** 17 /**
13 * This method returns the ranges of the XYDataset <i>dataset</i> as array 18 * This method returns the ranges of the XYDataset <i>dataset</i> as array
14 * with [xrange, yrange]. 19 * with [xrange, yrange].
15 * 20 *
16 * @param dataset The dataset which should be evaluated. 21 * @param dataset The dataset which should be evaluated.
17 * 22 *
18 * @return an array with x and y ranges. 23 * @return an array with x and y ranges.
19 */ 24 */
20 public static Range[] getRanges(XYDataset dataset) { 25 public static Range[] getRanges(XYDataset dataset) {
21 if (dataset == null) { 26 int seriesCount = dataset != null ? dataset.getSeriesCount() : 0;
27
28 if (seriesCount == 0) {
29 logger.warn("Dataset is empty or has no Series set.");
22 return null; 30 return null;
23 } 31 }
32
33 boolean foundValue = false;
24 34
25 double minX = Double.MAX_VALUE; 35 double minX = Double.MAX_VALUE;
26 double maxX = -Double.MAX_VALUE; 36 double maxX = -Double.MAX_VALUE;
27 double minY = Double.MAX_VALUE; 37 double minY = Double.MAX_VALUE;
28 double maxY = -Double.MAX_VALUE; 38 double maxY = -Double.MAX_VALUE;
29 39
30 for (int i = 0, m = dataset.getSeriesCount(); i < m; i++) { 40 for (int i = 0, m = seriesCount; i < m; i++) {
31 for (int j = 0, n = dataset.getItemCount(i); j < n; j++) { 41 for (int j = 0, n = dataset.getItemCount(i); j < n; j++) {
32 double x = dataset.getXValue(i, j); 42 double x = dataset.getXValue(i, j);
33 double y = dataset.getYValue(i, j); 43 double y = dataset.getYValue(i, j);
44
45 if (Double.isNaN(x) || Double.isNaN(y)) {
46 logger.warn("Item " + j + " in Series " + i + " is broken");
47 continue;
48 }
49
50 foundValue = true;
34 51
35 if (x < minX) { 52 if (x < minX) {
36 minX = x; 53 minX = x;
37 } 54 }
38 55
48 maxY = y; 65 maxY = y;
49 } 66 }
50 } 67 }
51 } 68 }
52 69
53 return new Range[] { new Range(minX, maxX), new Range(minY, maxY) }; 70 return foundValue
71 ? new Range[] { new Range(minX, maxX), new Range(minY, maxY) }
72 : null;
73 }
74
75
76 /**
77 * Expand range by percent.
78 *
79 * @param range The range to expand.
80 * @param percent The percentage to expand.
81 *
82 * @param an expanded range.
83 */
84 public static Range expandRange(Range range, double percent) {
85 if (range == null) {
86 return null;
87 }
88
89 double value = range.getLowerBound();
90 double expand = Math.abs(value / 100 * percent);
91
92 return expand != 0
93 ? new Range(value-expand, value+expand)
94 : new Range(-0.01 * percent, 0.01 * percent);
54 } 95 }
55 } 96 }
56 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : 97 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org