/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2007, by Object Refinery Limited 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.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* -----------------
* AreaRenderer.java
* -----------------
* (C) Copyright 2002-2007, by Jon Iles and Contributors.
*
* Original Author: Jon Iles;
* Contributor(s): David Gilbert (for Object Refinery Limited);
* Christian W. Zuckschwerdt;
*
* Changes:
* --------
* 21-May-2002 : Version 1, contributed by John Iles (DG);
* 29-May-2002 : Now extends AbstractCategoryItemRenderer (DG);
* 11-Jun-2002 : Updated Javadoc comments (DG);
* 25-Jun-2002 : Removed unnecessary imports (DG);
* 01-Oct-2002 : Fixed errors reported by Checkstyle (DG);
* 10-Oct-2002 : Added constructors and basic entity support (DG);
* 24-Oct-2002 : Amendments for changes in CategoryDataset interface and
* CategoryToolTipGenerator interface (DG);
* 05-Nov-2002 : Replaced references to CategoryDataset with TableDataset (DG);
* 06-Nov-2002 : Renamed drawCategoryItem() --> drawItem() and now using axis
* for category spacing. Renamed AreaCategoryItemRenderer
* --> AreaRenderer (DG);
* 17-Jan-2003 : Moved plot classes into a separate package (DG);
* 25-Mar-2003 : Implemented Serializable (DG);
* 10-Apr-2003 : Changed CategoryDataset to KeyedValues2DDataset in
* drawItem() method (DG);
* 12-May-2003 : Modified to take into account the plot orientation (DG);
* 30-Jul-2003 : Modified entity constructor (CZ);
* 13-Aug-2003 : Implemented Cloneable (DG);
* 07-Oct-2003 : Added renderer state (DG);
* 05-Nov-2004 : Modified drawItem() signature (DG);
* 20-Apr-2005 : Apply tooltips and URLs to legend items (DG);
* 09-Jun-2005 : Use addItemEntity() method from superclass (DG);
* ------------- JFREECHART 1.0.x ---------------------------------------------
* 11-Oct-2006 : Fixed bug in equals() method (DG);
* 30-Nov-2006 : Added checks for series visibility (DG);
* 20-Apr-2007 : Updated getLegendItem() for renderer change (DG);
* 17-May-2007 : Set datasetIndex and seriesIndex in getLegendItem() (DG);
* 18-May-2007 : Set dataset and seriesKey for LegendItem (DG);
*
*/
package org.jfree.chart.renderer.category;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.GeneralPath;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
import org.jfree.chart.LegendItem;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.AreaRendererEndType;
import org.jfree.data.category.CategoryDataset;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.PublicCloneable;
/**
* A category item renderer that draws area charts. You can use this renderer
* with the {@link org.jfree.chart.plot.CategoryPlot} class.
*/
public class AreaRenderer extends AbstractCategoryItemRenderer
implements Cloneable, PublicCloneable, Serializable {
/** For serialization. */
private static final long serialVersionUID = -4231878281385812757L;
/** A flag that controls how the ends of the areas are drawn. */
private AreaRendererEndType endType;
/**
* Creates a new renderer.
*/
public AreaRenderer() {
super();
this.endType = AreaRendererEndType.TAPER;
}
/**
* Returns a token that controls how the renderer draws the end points.
* The default value is {@link AreaRendererEndType#TAPER}.
*
* @return The end type (never <code>null</code>).
*
* @see #setEndType
*/
public AreaRendererEndType getEndType() {
return this.endType;
}
/**
* Sets a token that controls how the renderer draws the end points, and
* sends a {@link RendererChangeEvent} to all registered listeners.
*
* @param type the end type (<code>null</code> not permitted).
*
* @see #getEndType()
*/
public void setEndType(AreaRendererEndType type) {
if (type == null) {
throw new IllegalArgumentException("Null 'type' argument.");
}
this.endType = type;
fireChangeEvent();
}
/**
* Returns a legend item for a series.
*
* @param datasetIndex the dataset index (zero-based).
* @param series the series index (zero-based).
*
* @return The legend item.
*/
public LegendItem getLegendItem(int datasetIndex, int series) {
// if there is no plot, there is no dataset to access...
CategoryPlot cp = getPlot();
if (cp == null) {
return null;
}
// check that a legend item needs to be displayed...
if (!isSeriesVisible(series) || !isSeriesVisibleInLegend(series)) {
return null;
}
CategoryDataset dataset = cp.getDataset(datasetIndex);
String label = getLegendItemLabelGenerator().generateLabel(dataset,
series);
String description = label;
String toolTipText = null;
if (getLegendItemToolTipGenerator() != null) {
toolTipText = getLegendItemToolTipGenerator().generateLabel(
dataset, series);
}
String urlText = null;
if (getLegendItemURLGenerator() != null) {
urlText = getLegendItemURLGenerator().generateLabel(dataset,
series);
}
Shape shape = new Rectangle2D.Double(-4.0, -4.0, 8.0, 8.0);
Paint paint = lookupSeriesPaint(series);
Paint outlinePaint = lookupSeriesOutlinePaint(series);
Stroke outlineStroke = lookupSeriesOutlineStroke(series);
LegendItem result = new LegendItem(label, description, toolTipText,
urlText, shape, paint, outlineStroke, outlinePaint);
result.setDataset(dataset);
result.setDatasetIndex(datasetIndex);
result.setSeriesKey(dataset.getRowKey(series));
result.setSeriesIndex(series);
return result;
}
/**
* Draw a single data item.
*
* @param g2 the graphics device.
* @param state the renderer state.
* @param dataArea the data plot area.
* @param plot the plot.
* @param domainAxis the domain axis.
* @param rangeAxis the range axis.
* @param dataset the dataset.
* @param row the row index (zero-based).
* @param column the column index (zero-based).
* @param pass the pass index.
*/
public void drawItem(Graphics2D g2,
CategoryItemRendererState state,
Rectangle2D dataArea,
CategoryPlot plot,
CategoryAxis domainAxis,
ValueAxis rangeAxis,
CategoryDataset dataset,
int row,
int column,
int pass) {
// do nothing if item is not visible
if (!getItemVisible(row, column)) {
return;
}
// plot non-null values only...
Number value = dataset.getValue(row, column);
if (value != null) {
PlotOrientation orientation = plot.getOrientation();
RectangleEdge axisEdge = plot.getDomainAxisEdge();
int count = dataset.getColumnCount();
float x0 = (float) domainAxis.getCategoryStart(column, count,
dataArea, axisEdge);
float x1 = (float) domainAxis.getCategoryMiddle(column, count,
dataArea, axisEdge);
float x2 = (float) domainAxis.getCategoryEnd(column, count,
dataArea, axisEdge);
x0 = Math.round(x0);
x1 = Math.round(x1);
x2 = Math.round(x2);
if (this.endType == AreaRendererEndType.TRUNCATE) {
if (column == 0) {
x0 = x1;
}
else if (column == getColumnCount() - 1) {
x2 = x1;
}
}
double yy1 = value.doubleValue();
double yy0 = 0.0;
if (column > 0) {
Number n0 = dataset.getValue(row, column - 1);
if (n0 != null) {
yy0 = (n0.doubleValue() + yy1) / 2.0;
}
}
double yy2 = 0.0;
if (column < dataset.getColumnCount() - 1) {
Number n2 = dataset.getValue(row, column + 1);
if (n2 != null) {
yy2 = (n2.doubleValue() + yy1) / 2.0;
}
}
RectangleEdge edge = plot.getRangeAxisEdge();
float y0 = (float) rangeAxis.valueToJava2D(yy0, dataArea, edge);
float y1 = (float) rangeAxis.valueToJava2D(yy1, dataArea, edge);
float y2 = (float) rangeAxis.valueToJava2D(yy2, dataArea, edge);
float yz = (float) rangeAxis.valueToJava2D(0.0, dataArea, edge);
g2.setPaint(getItemPaint(row, column));
g2.setStroke(getItemStroke(row, column));
GeneralPath area = new GeneralPath();
if (orientation == PlotOrientation.VERTICAL) {
area.moveTo(x0, yz);
area.lineTo(x0, y0);
area.lineTo(x1, y1);
area.lineTo(x2, y2);
area.lineTo(x2, yz);
}
else if (orientation == PlotOrientation.HORIZONTAL) {
area.moveTo(yz, x0);
area.lineTo(y0, x0);
area.lineTo(y1, x1);
area.lineTo(y2, x2);
area.lineTo(yz, x2);
}
area.closePath();
g2.setPaint(getItemPaint(row, column));
g2.fill(area);
// draw the item labels if there are any...
if (isItemLabelVisible(row, column)) {
drawItemLabel(g2, orientation, dataset, row, column, x1, y1,
(value.doubleValue() < 0.0));
}
// add an item entity, if this information is being collected
EntityCollection entities = state.getEntityCollection();
if (entities != null) {
addItemEntity(entities, dataset, row, column, area);
}
}
}
/**
* Tests this instance for equality with an arbitrary object.
*
* @param obj the object to test (<code>null</code> permitted).
*
* @return A boolean.
*/
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof AreaRenderer)) {
return false;
}
AreaRenderer that = (AreaRenderer) obj;
if (!this.endType.equals(that.endType)) {
return false;
}
return super.equals(obj);
}
/**
* Returns an independent copy of the renderer.
*
* @return A clone.
*
* @throws CloneNotSupportedException should not happen.
*/
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
}
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