Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/exports/ChartHelper.java @ 3313:1a9ab048573a
Prevent nasty NPE.
flys-artifacts/trunk@5002 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Fri, 13 Jul 2012 19:01:03 +0000 |
parents | b2ea89a665bc |
children |
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package de.intevation.flys.exports; import org.jfree.data.Range; import org.jfree.data.xy.XYDataset; import org.jfree.data.xy.XYSeriesCollection; import org.jfree.data.time.RegularTimePeriod; import org.jfree.data.time.TimeSeriesCollection; import org.jfree.data.time.TimeSeries; import org.apache.log4j.Logger; import de.intevation.flys.jfree.Bounds; import de.intevation.flys.jfree.DoubleBounds; import de.intevation.flys.jfree.TimeBounds; /** * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> */ public class ChartHelper { private static final Logger logger = Logger.getLogger(ChartHelper.class); /** * This method returns the ranges of the XYDataset <i>dataset</i> as array * with [xrange, yrange]. * * @param dataset The dataset which should be evaluated. * * @return an array with x and y ranges. */ public static Bounds[] getBounds(XYSeriesCollection dataset) { int seriesCount = dataset != null ? dataset.getSeriesCount() : 0; if (seriesCount == 0) { logger.warn("Dataset is empty or has no Series set."); return null; } boolean foundValue = false; double minX = Double.MAX_VALUE; double maxX = -Double.MAX_VALUE; double minY = Double.MAX_VALUE; double maxY = -Double.MAX_VALUE; for (int i = 0, m = seriesCount; i < m; i++) { for (int j = 0, n = dataset.getItemCount(i); j < n; j++) { double x = dataset.getXValue(i, j); double y = dataset.getYValue(i, j); if (Double.isNaN(x) || Double.isNaN(y)) { logger.warn("Item " + j + " in Series " + i + " is broken"); continue; } foundValue = true; if (x < minX) { minX = x; } if (x > maxX) { maxX = x; } if (y < minY) { minY = y; } if (y > maxY) { maxY = y; } } } return foundValue ? new Bounds[] { new DoubleBounds(minX, maxX), new DoubleBounds(minY, maxY) } : null; } public static Bounds[] getBounds(XYDataset dataset) { if (dataset instanceof XYSeriesCollection) { return getBounds((XYSeriesCollection) dataset); } else if(dataset instanceof TimeSeriesCollection) { return getBounds((TimeSeriesCollection) dataset); } else { logger.warn("Unknown XYDataset instance: " + dataset.getClass()); return null; } } public static Bounds[] getBounds(TimeSeriesCollection collection) { int seriesCount = collection != null ? collection.getSeriesCount() : 0; if (seriesCount == 0) { logger.warn("TimeSeriesCollection is empty or has no Series set."); return null; } boolean foundValue = false; long lowerX = Long.MAX_VALUE; long upperX = -Long.MAX_VALUE; double lowerY = Double.MAX_VALUE; double upperY = -Double.MAX_VALUE; for (int i = 0, m = seriesCount; i < m; i++) { TimeSeries series = collection.getSeries(i); for (int j = 0, n = collection.getItemCount(i); j < n; j++) { RegularTimePeriod rtp = series.getTimePeriod(j); if (rtp == null) { continue; } foundValue = true; long start = rtp.getFirstMillisecond(); long end = rtp.getLastMillisecond(); if (start < lowerX) { lowerX = start; } if (end > upperX) { upperX = end; } double y = series.getValue(j).doubleValue(); lowerY = Math.min(lowerY, y); upperY = Math.max(upperY, y); } } if (foundValue) { return new Bounds[] { new TimeBounds(lowerX, upperX), new DoubleBounds(lowerY, upperY) }; } return null; } /** * Expand bounds by percent. * * @param bounds The bounds to expand. * @param percent The percentage to expand. * * @return a new, expanded bounds. */ public static Bounds expandBounds(Bounds bounds, double percent) { if (bounds == null) { return null; } double value = (Double) bounds.getLower(); double expand = Math.abs(value / 100 * percent); return expand != 0 ? new DoubleBounds(value-expand, value+expand) : new DoubleBounds(-0.01 * percent, 0.01 * percent); } /** * Expand range by percent. * * @param range The range to expand. * @param percent The percentage to expand. * * @return a new, expanded range. */ public static Range expandRange(Range range, double percent) { if (range == null) { return null; } double value = range.getLowerBound(); double expand = Math.abs(value / 100 * percent); return expand != 0 ? new Range(value-expand, value+expand) : new Range(-0.01 * percent, 0.01 * percent); } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :