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JFreeChart is a class library, written in Java, for generating charts.
Utilising the Java2D API, it supports a wide range of chart types including
bar charts, pie charts, line charts, XY-plots, time series plots, Sankey charts
and more.
/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2021, 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.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* ------------------
* XYDotRenderer.java
* ------------------
* (C) Copyright 2002-2021, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): Christian W. Zuckschwerdt;
*
*/
package org.jfree.chart.renderer.xy;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import org.jfree.chart.LegendItem;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.event.RendererChangeEvent;
import org.jfree.chart.plot.CrosshairState;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.ui.RectangleEdge;
import org.jfree.chart.util.Args;
import org.jfree.chart.util.PublicCloneable;
import org.jfree.chart.util.SerialUtils;
import org.jfree.chart.util.ShapeUtils;
import org.jfree.data.xy.XYDataset;
/**
* A renderer that draws a small dot at each data point for an {@link XYPlot}.
* The example shown here is generated by the
* {@code ScatterPlotDemo4.java} program included in the JFreeChart
* demo collection:
*
* 
*/
public class XYDotRenderer extends AbstractXYItemRenderer
implements XYItemRenderer, PublicCloneable {
/** For serialization. */
private static final long serialVersionUID = -2764344339073566425L;
/** The dot width. */
private int dotWidth;
/** The dot height. */
private int dotHeight;
/**
* The shape that is used to represent an item in the legend.
*/
private transient Shape legendShape;
/**
* Constructs a new renderer.
*/
public XYDotRenderer() {
super();
this.dotWidth = 1;
this.dotHeight = 1;
this.legendShape = new Rectangle2D.Double(-3.0, -3.0, 6.0, 6.0);
}
/**
* Returns the dot width (the default value is 1).
*
* @return The dot width.
*
* @see #setDotWidth(int)
*/
public int getDotWidth() {
return this.dotWidth;
}
/**
* Sets the dot width and sends a {@link RendererChangeEvent} to all
* registered listeners.
*
* @param w the new width (must be greater than zero).
*
* @throws IllegalArgumentException if {@code w} is less than one.
*
* @see #getDotWidth()
*/
public void setDotWidth(int w) {
if (w < 1) {
throw new IllegalArgumentException("Requires w > 0.");
}
this.dotWidth = w;
fireChangeEvent();
}
/**
* Returns the dot height (the default value is 1).
*
* @return The dot height.
*
* @see #setDotHeight(int)
*/
public int getDotHeight() {
return this.dotHeight;
}
/**
* Sets the dot height and sends a {@link RendererChangeEvent} to all
* registered listeners.
*
* @param h the new height (must be greater than zero).
*
* @throws IllegalArgumentException if {@code h} is less than one.
*
* @see #getDotHeight()
*/
public void setDotHeight(int h) {
if (h < 1) {
throw new IllegalArgumentException("Requires h > 0.");
}
this.dotHeight = h;
fireChangeEvent();
}
/**
* Returns the shape used to represent an item in the legend.
*
* @return The legend shape (never {@code null}).
*
* @see #setLegendShape(Shape)
*/
public Shape getLegendShape() {
return this.legendShape;
}
/**
* Sets the shape used as a line in each legend item and sends a
* {@link RendererChangeEvent} to all registered listeners.
*
* @param shape the shape ({@code null} not permitted).
*
* @see #getLegendShape()
*/
public void setLegendShape(Shape shape) {
Args.nullNotPermitted(shape, "shape");
this.legendShape = shape;
fireChangeEvent();
}
/**
* Draws the visual representation of a single data item.
*
* @param g2 the graphics device.
* @param state the renderer state.
* @param dataArea the area within which the data is being drawn.
* @param info collects information about the drawing.
* @param plot the plot (can be used to obtain standard color
* information etc).
* @param domainAxis the domain (horizontal) axis.
* @param rangeAxis the range (vertical) axis.
* @param dataset the dataset.
* @param series the series index (zero-based).
* @param item the item index (zero-based).
* @param crosshairState crosshair information for the plot
* ({@code null} permitted).
* @param pass the pass index.
*/
@Override
public void drawItem(Graphics2D g2, XYItemRendererState state,
Rectangle2D dataArea, PlotRenderingInfo info, XYPlot plot,
ValueAxis domainAxis, ValueAxis rangeAxis, XYDataset dataset,
int series, int item, CrosshairState crosshairState, int pass) {
// do nothing if item is not visible
if (!getItemVisible(series, item)) {
return;
}
// get the data point...
double x = dataset.getXValue(series, item);
double y = dataset.getYValue(series, item);
double adjx = (this.dotWidth - 1) / 2.0;
double adjy = (this.dotHeight - 1) / 2.0;
if (!Double.isNaN(y)) {
RectangleEdge xAxisLocation = plot.getDomainAxisEdge();
RectangleEdge yAxisLocation = plot.getRangeAxisEdge();
double transX = domainAxis.valueToJava2D(x, dataArea,
xAxisLocation) - adjx;
double transY = rangeAxis.valueToJava2D(y, dataArea, yAxisLocation)
- adjy;
g2.setPaint(getItemPaint(series, item));
PlotOrientation orientation = plot.getOrientation();
if (orientation == PlotOrientation.HORIZONTAL) {
g2.fillRect((int) transY, (int) transX, this.dotHeight,
this.dotWidth);
}
else if (orientation == PlotOrientation.VERTICAL) {
g2.fillRect((int) transX, (int) transY, this.dotWidth,
this.dotHeight);
}
int datasetIndex = plot.indexOf(dataset);
updateCrosshairValues(crosshairState, x, y, datasetIndex,
transX, transY, orientation);
}
}
/**
* Returns a legend item for the specified series.
*
* @param datasetIndex the dataset index (zero-based).
* @param series the series index (zero-based).
*
* @return A legend item for the series (possibly {@code null}).
*/
@Override
public LegendItem getLegendItem(int datasetIndex, int series) {
// if the renderer isn't assigned to a plot, then we don't have a
// dataset...
XYPlot plot = getPlot();
if (plot == null) {
return null;
}
XYDataset dataset = plot.getDataset(datasetIndex);
if (dataset == null) {
return null;
}
LegendItem result = null;
if (getItemVisible(series, 0)) {
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);
}
Paint fillPaint = lookupSeriesPaint(series);
result = new LegendItem(label, description, toolTipText, urlText,
getLegendShape(), fillPaint);
result.setLabelFont(lookupLegendTextFont(series));
Paint labelPaint = lookupLegendTextPaint(series);
if (labelPaint != null) {
result.setLabelPaint(labelPaint);
}
result.setSeriesKey(dataset.getSeriesKey(series));
result.setSeriesIndex(series);
result.setDataset(dataset);
result.setDatasetIndex(datasetIndex);
}
return result;
}
/**
* Tests this renderer for equality with an arbitrary object. This method
* returns {@code true} if and only if:
*
*
* - {@code obj} is not {@code null};
* - {@code obj} is an instance of {@code XYDotRenderer};
* - both renderers have the same attribute values.
*
*
* @param obj the object ({@code null} permitted).
*
* @return A boolean.
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof XYDotRenderer)) {
return false;
}
XYDotRenderer that = (XYDotRenderer) obj;
if (this.dotWidth != that.dotWidth) {
return false;
}
if (this.dotHeight != that.dotHeight) {
return false;
}
if (!ShapeUtils.equal(this.legendShape, that.legendShape)) {
return false;
}
return super.equals(obj);
}
/**
* Returns a clone of the renderer.
*
* @return A clone.
*
* @throws CloneNotSupportedException if the renderer cannot be cloned.
*/
@Override
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
/**
* 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.legendShape = SerialUtils.readShape(stream);
}
/**
* 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.legendShape, stream);
}
}