net.sf.mzmine.modules.visualization.spectra.renderers.SpectraItemLabelGenerator.java Source code

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Here is the source code for net.sf.mzmine.modules.visualization.spectra.renderers.SpectraItemLabelGenerator.java

Source

/*
 * Copyright 2006-2014 The MZmine 2 Development Team
 * 
 * This file is part of MZmine 2.
 * 
 * MZmine 2 is free software; you can redistribute it and/or modify it under the
 * terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 * 
 * MZmine 2 is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * MZmine 2; if not, write to the Free Software Foundation, Inc., 51 Franklin St,
 * Fifth Floor, Boston, MA 02110-1301 USA
 */

package net.sf.mzmine.modules.visualization.spectra.renderers;

import java.text.NumberFormat;

import net.sf.mzmine.main.MZmineCore;
import net.sf.mzmine.modules.visualization.spectra.SpectraPlot;
import net.sf.mzmine.modules.visualization.spectra.datasets.ScanDataSet;

import org.jfree.chart.labels.XYItemLabelGenerator;
import org.jfree.data.xy.XYDataset;

/**
 * Label generator for spectra visualizer. Only used to generate labels for the
 * raw data (ScanDataSet)
 */
public class SpectraItemLabelGenerator implements XYItemLabelGenerator {

    /*
     * Number of screen pixels to reserve for each label, so that the labels do
     * not overlap
     */
    public static final int POINTS_RESERVE_X = 100;

    private SpectraPlot plot;

    private NumberFormat mzFormat = MZmineCore.getConfiguration().getMZFormat();

    public SpectraItemLabelGenerator(SpectraPlot plot) {
        this.plot = plot;
    }

    /**
     * @see org.jfree.chart.labels.XYItemLabelGenerator#generateLabel(org.jfree.data.xy.XYDataset,
     *      int, int)
     */
    public String generateLabel(XYDataset dataset, int series, int item) {

        // X and Y values of current data point
        double originalX = dataset.getX(series, item).doubleValue();
        double originalY = dataset.getY(series, item).doubleValue();

        // Calculate data size of 1 screen pixel
        double xLength = (double) plot.getXYPlot().getDomainAxis().getRange().getLength();
        double pixelX = xLength / plot.getWidth();

        // Size of data set
        int itemCount = dataset.getItemCount(series);

        // Search for data points higher than this one in the interval
        // from limitLeft to limitRight
        double limitLeft = originalX - ((POINTS_RESERVE_X / 2) * pixelX);
        double limitRight = originalX + ((POINTS_RESERVE_X / 2) * pixelX);

        // Iterate data points to the left and right
        for (int i = 1; (item - i > 0) || (item + i < itemCount); i++) {

            // If we get out of the limit we can stop searching
            if ((item - i > 0) && (dataset.getXValue(series, item - i) < limitLeft)
                    && ((item + i >= itemCount) || (dataset.getXValue(series, item + i) > limitRight)))
                break;

            if ((item + i < itemCount) && (dataset.getXValue(series, item + i) > limitRight)
                    && ((item - i <= 0) || (dataset.getXValue(series, item - i) < limitLeft)))
                break;

            // If we find higher data point, bail out
            if ((item - i > 0) && (originalY <= dataset.getYValue(series, item - i)))
                return null;

            if ((item + i < itemCount) && (originalY <= dataset.getYValue(series, item + i)))
                return null;

        }

        // Create label
        String label = null;
        if (dataset instanceof ScanDataSet) {
            label = ((ScanDataSet) dataset).getAnnotation(item);
        }
        if (label == null) {
            double mzValue = dataset.getXValue(series, item);
            label = mzFormat.format(mzValue);
        }

        return label;

    }

}