ChartRenderingInfo.java
/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2022, by David Gilbert and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* -----------------------
* ChartRenderingInfo.java
* -----------------------
* (C) Copyright 2002-2022, by David Gilbert.
*
* Original Author: David Gilbert;
* Contributor(s): -;
*
*/
package org.jfree.chart;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Objects;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.api.PublicCloneable;
import org.jfree.chart.internal.SerialUtils;
/**
* A structure for storing rendering information from one call to the
* JFreeChart.draw() method.
* <P>
* An instance of the {@link JFreeChart} class can draw itself within an
* arbitrary rectangle on any {@code Graphics2D}. It is assumed that
* client code will sometimes render the same chart in more than one view, so
* the {@link JFreeChart} instance does not retain any information about its
* rendered dimensions. This information can be useful sometimes, so you have
* the option to collect the information at each call to
* {@code JFreeChart.draw()}, by passing an instance of this
* {@code ChartRenderingInfo} class.
*/
public class ChartRenderingInfo implements Cloneable, Serializable {
/** For serialization. */
private static final long serialVersionUID = 2751952018173406822L;
/** The area in which the chart is drawn. */
private transient Rectangle2D chartArea;
/** Rendering info for the chart's plot (and subplots, if any). */
private PlotRenderingInfo plotInfo;
/**
* Storage for the chart entities. Since retaining entity information for
* charts with a large number of data points consumes a lot of memory, it
* is intended that you can set this to {@code null} to prevent the
* information being collected.
*/
private EntityCollection entities;
/**
* Constructs a new ChartRenderingInfo structure that can be used to
* collect information about the dimensions of a rendered chart.
*/
public ChartRenderingInfo() {
this(new StandardEntityCollection());
}
/**
* Constructs a new instance. If an entity collection is supplied, it will
* be populated with information about the entities in a chart. If it is
* {@code null}, no entity information (including tool tips) will
* be collected.
*
* @param entities an entity collection ({@code null} permitted).
*/
public ChartRenderingInfo(EntityCollection entities) {
this.chartArea = new Rectangle2D.Double();
this.plotInfo = new PlotRenderingInfo(this);
this.entities = entities;
}
/**
* Returns the area in which the chart was drawn.
*
* @return The area in which the chart was drawn.
*
* @see #setChartArea(Rectangle2D)
*/
public Rectangle2D getChartArea() {
return this.chartArea;
}
/**
* Sets the area in which the chart was drawn.
*
* @param area the chart area.
*
* @see #getChartArea()
*/
public void setChartArea(Rectangle2D area) {
this.chartArea.setRect(area);
}
/**
* Returns the collection of entities maintained by this instance.
*
* @return The entity collection (possibly {@code null}).
*
* @see #setEntityCollection(EntityCollection)
*/
public EntityCollection getEntityCollection() {
return this.entities;
}
/**
* Sets the entity collection.
*
* @param entities the entity collection ({@code null} permitted).
*
* @see #getEntityCollection()
*/
public void setEntityCollection(EntityCollection entities) {
this.entities = entities;
}
/**
* Clears the information recorded by this object.
*/
public void clear() {
this.chartArea.setRect(0.0, 0.0, 0.0, 0.0);
this.plotInfo = new PlotRenderingInfo(this);
if (this.entities != null) {
this.entities.clear();
}
}
/**
* Returns the rendering info for the chart's plot.
*
* @return The rendering info for the plot.
*/
public PlotRenderingInfo getPlotInfo() {
return this.plotInfo;
}
/**
* Tests this object for equality with an arbitrary object.
*
* @param obj the object to test against ({@code null} permitted).
*
* @return A boolean.
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof ChartRenderingInfo)) {
return false;
}
ChartRenderingInfo that = (ChartRenderingInfo) obj;
if (!Objects.equals(this.chartArea, that.chartArea)) {
return false;
}
if (!Objects.equals(this.plotInfo, that.plotInfo)) {
return false;
}
if (!Objects.equals(this.entities, that.entities)) {
return false;
}
return true;
}
@Override
public int hashCode(){
int hash = 7;
hash = 79 * hash + Objects.hashCode(this.chartArea);
hash = 79 * hash + Objects.hashCode(this.entities);
hash = 79 * hash + Objects.hashCode(this.plotInfo);
return hash;
}
/**
* Returns a clone of this object.
*
* @return A clone.
*
* @throws CloneNotSupportedException if the object cannot be cloned.
*/
@Override
public Object clone() throws CloneNotSupportedException {
ChartRenderingInfo clone = (ChartRenderingInfo) super.clone();
if (this.chartArea != null) {
clone.chartArea = (Rectangle2D) this.chartArea.clone();
}
if (this.entities instanceof PublicCloneable) {
PublicCloneable pc = (PublicCloneable) this.entities;
clone.entities = (EntityCollection) pc.clone();
}
return clone;
}
/**
* Provides serialization support.
*
* @param stream the output stream.
*
* @throws IOException if there is an I/O error.
*/
private void writeObject(ObjectOutputStream stream) throws IOException {
stream.defaultWriteObject();
SerialUtils.writeShape(this.chartArea, stream);
}
/**
* Provides serialization support.
*
* @param stream the input stream.
*
* @throws IOException if there is an I/O error.
* @throws ClassNotFoundException if there is a classpath problem.
*/
private void readObject(ObjectInputStream stream)
throws IOException, ClassNotFoundException {
stream.defaultReadObject();
this.chartArea = (Rectangle2D) SerialUtils.readShape(stream);
}
}