view flys-artifacts/src/main/java/de/intevation/flys/exports/ChartHelper.java @ 5645:696d710470f5

flys/issue1077: Show loads as step line, therefore transform data in SedimentLoadFacet to stretch as in the measurement stations bounds. Deal with this new kind of data in the Generator.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 10 Apr 2013 09:35:07 +0200
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);
    }
}
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