org.mwc.debrief.track_shift.views.CachedTickDateAxis.java Source code

Introduction

Here is the source code for org.mwc.debrief.track_shift.views.CachedTickDateAxis.java

Source

/*
 *    Debrief - the Open Source Maritime Analysis Application
 *    http://debrief.info
 *
 *    (C) 2000-2014, PlanetMayo Ltd
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the Eclipse Public License v1.0
 *    (http://www.eclipse.org/legal/epl-v10.html)
 *
 *    This library 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. 
 */
package org.mwc.debrief.track_shift.views;

import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import java.util.List;

import org.jfree.chart.axis.DateAxis;
import org.jfree.ui.RectangleEdge;

public class CachedTickDateAxis extends DateAxis {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    private Double _lastHeight = null;

    /** pass the constructor args back to the parent
     * 
     * @param string
     */
    public CachedTickDateAxis(final String string) {
        super(string);
    }

    @SuppressWarnings("rawtypes")
    private List _myTicks;

    /** utility method to clear our cached list (when we know dates have changed)
     * 
     */
    public void clearTicks() {
        _myTicks = null;
    }

    @SuppressWarnings("rawtypes")
    @Override
    protected List refreshTicksVertical(final Graphics2D g2, final Rectangle2D dataArea, final RectangleEdge edge) {
        // do we have a height?
        if (_lastHeight != null) {
            // is the new height different to our last one?
            if (Math.abs(dataArea.getHeight() - _lastHeight.doubleValue()) > 60) {
                // yes - ditch the ticks
                _myTicks = null;
            }
        }

        // do we have any ticks?
        if (_myTicks == null) {
            // nope, better create some
            _myTicks = super.refreshTicksVertical(g2, dataArea, edge);
            _lastHeight = dataArea.getHeight();
        }

        return _myTicks;
    }

}