Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/exports/ChartHelper.java @ 2315:c0dfa36add96

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Some bugfixes and improvements in the calculation of historical discharge curves. flys-artifacts/trunk@3996 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Thu, 09 Feb 2012 11:47:25 +0000
parents 2b232871ba28
children 594885703687
rev   line source
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60615235e951 Added a ChartHelper class that currently contains a method to compute the xy ranges of an XYDataset.
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1 package de.intevation.flys.exports;
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2
60615235e951 Added a ChartHelper class that currently contains a method to compute the xy ranges of an XYDataset.
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3 import org.jfree.data.Range;
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4 import org.jfree.data.xy.XYDataset;
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5
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6 import org.apache.log4j.Logger;
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7
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8
60615235e951 Added a ChartHelper class that currently contains a method to compute the xy ranges of an XYDataset.
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9 /**
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10 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
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11 */
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12 public class ChartHelper {
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13
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14 private static final Logger logger = Logger.getLogger(ChartHelper.class);
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15
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16
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17 /**
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18 * This method returns the ranges of the XYDataset <i>dataset</i> as array
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19 * with [xrange, yrange].
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20 *
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21 * @param dataset The dataset which should be evaluated.
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22 *
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23 * @return an array with x and y ranges.
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24 */
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25 public static Range[] getRanges(XYDataset dataset) {
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26 int seriesCount = dataset != null ? dataset.getSeriesCount() : 0;
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27
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28 if (seriesCount == 0) {
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29 logger.warn("Dataset is empty or has no Series set.");
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30 return null;
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31 }
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32
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33 boolean foundValue = false;
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34
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35 double minX = Double.MAX_VALUE;
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36 double maxX = -Double.MAX_VALUE;
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37 double minY = Double.MAX_VALUE;
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38 double maxY = -Double.MAX_VALUE;
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39
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40 for (int i = 0, m = seriesCount; i < m; i++) {
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41 for (int j = 0, n = dataset.getItemCount(i); j < n; j++) {
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42 double x = dataset.getXValue(i, j);
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43 double y = dataset.getYValue(i, j);
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44
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45 if (Double.isNaN(x) || Double.isNaN(y)) {
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46 logger.warn("Item " + j + " in Series " + i + " is broken");
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47 continue;
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48 }
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49
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50 foundValue = true;
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51
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52 if (x < minX) {
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53 minX = x;
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54 }
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55
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56 if (x > maxX) {
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57 maxX = x;
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58 }
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59
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60 if (y < minY) {
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61 minY = y;
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62 }
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63
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64 if (y > maxY) {
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65 maxY = y;
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66 }
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67 }
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68 }
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69
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70 return foundValue
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71 ? new Range[] { new Range(minX, maxX), new Range(minY, maxY) }
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72 : null;
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73 }
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74
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75
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76 /**
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77 * Expand range by percent.
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78 *
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79 * @param range The range to expand.
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80 * @param percent The percentage to expand.
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81 *
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82 * @param an expanded range.
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83 */
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84 public static Range expandRange(Range range, double percent) {
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85 if (range == null) {
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86 return null;
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87 }
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88
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89 double value = range.getLowerBound();
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90 double expand = Math.abs(value / 100 * percent);
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91
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92 return expand != 0
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93 ? new Range(value-expand, value+expand)
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94 : new Range(-0.01 * percent, 0.01 * percent);
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95 }
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96 }
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97 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org