Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/exports/ChartHelper.java @ 2237:60615235e951
Added a ChartHelper class that currently contains a method to compute the xy ranges of an XYDataset.
flys-artifacts/trunk@3884 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
|---|---|
| date | Thu, 02 Feb 2012 15:39:28 +0000 |
| parents | |
| children | 2b232871ba28 |
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| 2236:c2b15d9c0f43 | 2237:60615235e951 |
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| 1 package de.intevation.flys.exports; | |
| 2 | |
| 3 import org.jfree.data.Range; | |
| 4 import org.jfree.data.xy.XYDataset; | |
| 5 | |
| 6 | |
| 7 /** | |
| 8 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> | |
| 9 */ | |
| 10 public class ChartHelper { | |
| 11 | |
| 12 /** | |
| 13 * This method returns the ranges of the XYDataset <i>dataset</i> as array | |
| 14 * with [xrange, yrange]. | |
| 15 * | |
| 16 * @param dataset The dataset which should be evaluated. | |
| 17 * | |
| 18 * @return an array with x and y ranges. | |
| 19 */ | |
| 20 public static Range[] getRanges(XYDataset dataset) { | |
| 21 if (dataset == null) { | |
| 22 return null; | |
| 23 } | |
| 24 | |
| 25 double minX = Double.MAX_VALUE; | |
| 26 double maxX = -Double.MAX_VALUE; | |
| 27 double minY = Double.MAX_VALUE; | |
| 28 double maxY = -Double.MAX_VALUE; | |
| 29 | |
| 30 for (int i = 0, m = dataset.getSeriesCount(); i < m; i++) { | |
| 31 for (int j = 0, n = dataset.getItemCount(i); j < n; j++) { | |
| 32 double x = dataset.getXValue(i, j); | |
| 33 double y = dataset.getYValue(i, j); | |
| 34 | |
| 35 if (x < minX) { | |
| 36 minX = x; | |
| 37 } | |
| 38 | |
| 39 if (x > maxX) { | |
| 40 maxX = x; | |
| 41 } | |
| 42 | |
| 43 if (y < minY) { | |
| 44 minY = y; | |
| 45 } | |
| 46 | |
| 47 if (y > maxY) { | |
| 48 maxY = y; | |
| 49 } | |
| 50 } | |
| 51 } | |
| 52 | |
| 53 return new Range[] { new Range(minX, maxX), new Range(minY, maxY) }; | |
| 54 } | |
| 55 } | |
| 56 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |