/*
* RangePolicyMinimumViewport.java of project jchart2d. Shows all points given
* but not any additional void space.
* Copyright (C) 2005 - 2011 Achim Westermann, created on 20.04.2005, 11:12:12
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* 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. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* If you modify or optimize the code in a useful way please let me know.
* Achim.Westermann@gmx.de
*/
package info.monitorenter.gui.chart.rangepolicies;
import info.monitorenter.util.Range;
/**
* A <code>{@link info.monitorenter.gui.chart.IRangePolicy}</code> implementation that
* guarantees a minimum displayed range (viewport) but will stretch if values of
* the corresponding <code>{@link info.monitorenter.gui.chart.Chart2D}</code> exceeds these
* constructor given bounds.
* <p>
* To sum up the policy of this implementation this
* <code>{@link info.monitorenter.gui.chart.IRangePolicy}</code>
* <ol>
* <li>Guarantees to always display the constructor given range.
* <li>Guarantees to always display every value within the
* <code>{@link info.monitorenter.gui.chart.Chart2D}</code> (every
* <code>{@link info.monitorenter.gui.chart.TracePoint2D}</code> of the chart's
* <code>{@link info.monitorenter.gui.chart.ITrace2D}</code> instances).
* </ol>
* <p>
*
* @author <a href="mailto:Achim.Westermann@gmx.de">Achim Westermann </a>
*
* @version $Revision: 1.6 $
*/
public class RangePolicyMinimumViewport extends ARangePolicy {
/** Generated <code>serialVersionUID</code>. */
private static final long serialVersionUID = 6561375203121878786L;
/**
* <p>
* Constructs an instance that will always ensure that the given range will be
* displayed.
* </p>
*
* @param range
* the range that always should be visible.
*/
public RangePolicyMinimumViewport(final Range range) {
super(range);
}
/**
* Returns the maximum of the chart or of the internal range if greater.
* <p>
*
* @param chartMin
* ignored.
*
* @param chartMax
* returned if greater than the value of the internal range.
*
* @return Math.max(this.range.getMax(), chartMax).
*
* @see info.monitorenter.gui.chart.IRangePolicy#getMax(double, double)
*/
public double getMax(final double chartMin, final double chartMax) {
return Math.max(this.getRange().getMax(), chartMax);
}
/**
* @see info.monitorenter.gui.chart.IRangePolicy#getMin(double, double)
*/
public double getMin(final double chartMin, final double chartMax) {
return Math.min(this.getRange().getMin(), chartMin);
}
}