Plot.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.]
*
* ---------
* Plot.java
* ---------
* (C) Copyright 2000-2022, by David Gilbert and Contributors.
*
* Original Author: David Gilbert;
* Contributor(s): Sylvain Vieujot;
* Jeremy Bowman;
* Andreas Schneider;
* Gideon Krause;
* Nicolas Brodu;
* Michal Krause;
* Richard West, Advanced Micro Devices, Inc.;
* Peter Kolb - patches 2603321, 2809117;
*
*/
package org.jfree.chart.plot;
import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Font;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Paint;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Point2D;
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 javax.swing.event.EventListenerList;
import org.jfree.chart.ChartElement;
import org.jfree.chart.ChartElementVisitor;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.legend.LegendItemCollection;
import org.jfree.chart.legend.LegendItemSource;
import org.jfree.chart.annotations.Annotation;
import org.jfree.chart.axis.AxisLocation;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.entity.PlotEntity;
import org.jfree.chart.event.AnnotationChangeEvent;
import org.jfree.chart.event.AnnotationChangeListener;
import org.jfree.chart.event.AxisChangeEvent;
import org.jfree.chart.event.AxisChangeListener;
import org.jfree.chart.event.ChartChangeEventType;
import org.jfree.chart.event.MarkerChangeEvent;
import org.jfree.chart.event.MarkerChangeListener;
import org.jfree.chart.event.PlotChangeEvent;
import org.jfree.chart.event.PlotChangeListener;
import org.jfree.chart.text.G2TextMeasurer;
import org.jfree.chart.text.TextBlock;
import org.jfree.chart.text.TextBlockAnchor;
import org.jfree.chart.text.TextUtils;
import org.jfree.chart.api.RectangleEdge;
import org.jfree.chart.api.RectangleInsets;
import org.jfree.chart.internal.Args;
import org.jfree.chart.internal.CloneUtils;
import org.jfree.chart.internal.PaintUtils;
import org.jfree.chart.api.PublicCloneable;
import org.jfree.chart.api.RectangleAlignment;
import org.jfree.chart.internal.SerialUtils;
import org.jfree.data.general.DatasetChangeEvent;
import org.jfree.data.general.DatasetChangeListener;
/**
* The base class for all plots in JFreeChart. The {@link JFreeChart} class
* delegates the drawing of axes and data to the plot. This base class
* provides facilities common to most plot types.
*/
public abstract class Plot implements ChartElement, AxisChangeListener,
DatasetChangeListener, AnnotationChangeListener, MarkerChangeListener,
LegendItemSource, PublicCloneable, Cloneable, Serializable {
/** For serialization. */
private static final long serialVersionUID = -8831571430103671324L;
/** Useful constant representing zero. */
public static final Number ZERO = 0;
/** The default insets. */
public static final RectangleInsets DEFAULT_INSETS
= new RectangleInsets(4.0, 8.0, 4.0, 8.0);
/** The default outline stroke. */
public static final Stroke DEFAULT_OUTLINE_STROKE = new BasicStroke(0.5f,
BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
/** The default outline color. */
public static final Paint DEFAULT_OUTLINE_PAINT = Color.GRAY;
/** The default foreground alpha transparency. */
public static final float DEFAULT_FOREGROUND_ALPHA = 1.0f;
/** The default background alpha transparency. */
public static final float DEFAULT_BACKGROUND_ALPHA = 1.0f;
/** The default background color. */
public static final Paint DEFAULT_BACKGROUND_PAINT = Color.WHITE;
/** The minimum width at which the plot should be drawn. */
public static final int MINIMUM_WIDTH_TO_DRAW = 10;
/** The minimum height at which the plot should be drawn. */
public static final int MINIMUM_HEIGHT_TO_DRAW = 10;
/** A default box shape for legend items. */
public static final Shape DEFAULT_LEGEND_ITEM_BOX
= new Rectangle2D.Double(-4.0, -4.0, 8.0, 8.0);
/** A default circle shape for legend items. */
public static final Shape DEFAULT_LEGEND_ITEM_CIRCLE
= new Ellipse2D.Double(-4.0, -4.0, 8.0, 8.0);
/**
* The chart that the plot is assigned to. It can be {@code null} if the
* plot is not assigned to a chart yet, or if the plot is a subplot of a
* another plot.
*/
private JFreeChart chart;
/** The parent plot ({@code null} if this is the root plot). */
private Plot parent;
/** The message to display if no data is available. */
private String noDataMessage;
/** The font used to display the 'no data' message. */
private Font noDataMessageFont;
/** The paint used to draw the 'no data' message. */
private transient Paint noDataMessagePaint;
/** Amount of blank space around the plot area. */
private RectangleInsets insets;
/**
* A flag that controls whether or not the plot outline is drawn.
*/
private boolean outlineVisible;
/** The Stroke used to draw an outline around the plot. */
private transient Stroke outlineStroke;
/** The Paint used to draw an outline around the plot. */
private transient Paint outlinePaint;
/** An optional color used to fill the plot background. */
private transient Paint backgroundPaint;
/** An optional image for the plot background. */
private transient Image backgroundImage; // not currently serialized
/** The alignment for the background image. */
private RectangleAlignment backgroundImageAlignment = RectangleAlignment.FILL;
/** The alpha value used to draw the background image. */
private float backgroundImageAlpha = 0.5f;
/** The alpha-transparency for the plot. */
private float foregroundAlpha;
/** The alpha transparency for the background paint. */
private float backgroundAlpha;
/** The drawing supplier. */
private DrawingSupplier drawingSupplier;
/** Storage for registered change listeners. */
private transient EventListenerList listenerList;
/**
* A flag that controls whether or not the plot will notify listeners
* of changes (defaults to true, but sometimes it is useful to disable
* this).
*/
private boolean notify;
/**
* Creates a new plot.
*/
protected Plot() {
this.chart = null;
this.parent = null;
this.insets = DEFAULT_INSETS;
this.backgroundPaint = DEFAULT_BACKGROUND_PAINT;
this.backgroundAlpha = DEFAULT_BACKGROUND_ALPHA;
this.backgroundImage = null;
this.outlineVisible = true;
this.outlineStroke = DEFAULT_OUTLINE_STROKE;
this.outlinePaint = DEFAULT_OUTLINE_PAINT;
this.foregroundAlpha = DEFAULT_FOREGROUND_ALPHA;
this.noDataMessage = null;
this.noDataMessageFont = new Font("SansSerif", Font.PLAIN, 12);
this.noDataMessagePaint = Color.BLACK;
this.drawingSupplier = new DefaultDrawingSupplier();
this.notify = true;
this.listenerList = new EventListenerList();
}
/**
* Returns the chart that this plot is assigned to. This method can
* return {@code null} if the plot is not yet assigned to a plot, or if the
* plot is a subplot of another plot.
*
* @return The chart (possibly {@code null}).
*/
public JFreeChart getChart() {
return this.chart;
}
/**
* Sets the chart that the plot is assigned to. This method is not
* intended for external use.
*
* @param chart the chart ({@code null} permitted).
*/
public void setChart(JFreeChart chart) {
this.chart = chart;
}
/**
* Fetches the element hinting flag from the chart that this plot is
* assigned to. If the plot is not assigned (directly or indirectly) to
* a chart instance, this method will return {@code false}.
*
* @return A boolean.
*/
public boolean fetchElementHintingFlag() {
if (this.parent != null) {
return this.parent.fetchElementHintingFlag();
}
if (this.chart != null) {
return this.chart.getElementHinting();
}
return false;
}
/**
* Returns the string that is displayed when the dataset is empty or
* {@code null}.
*
* @return The 'no data' message ({@code null} possible).
*
* @see #setNoDataMessage(String)
* @see #getNoDataMessageFont()
* @see #getNoDataMessagePaint()
*/
public String getNoDataMessage() {
return this.noDataMessage;
}
/**
* Sets the message that is displayed when the dataset is empty or
* {@code null}, and sends a {@link PlotChangeEvent} to all registered
* listeners.
*
* @param message the message ({@code null} permitted).
*
* @see #getNoDataMessage()
*/
public void setNoDataMessage(String message) {
this.noDataMessage = message;
fireChangeEvent();
}
/**
* Returns the font used to display the 'no data' message.
*
* @return The font (never {@code null}).
*
* @see #setNoDataMessageFont(Font)
* @see #getNoDataMessage()
*/
public Font getNoDataMessageFont() {
return this.noDataMessageFont;
}
/**
* Sets the font used to display the 'no data' message and sends a
* {@link PlotChangeEvent} to all registered listeners.
*
* @param font the font ({@code null} not permitted).
*
* @see #getNoDataMessageFont()
*/
public void setNoDataMessageFont(Font font) {
Args.nullNotPermitted(font, "font");
this.noDataMessageFont = font;
fireChangeEvent();
}
/**
* Returns the paint used to display the 'no data' message.
*
* @return The paint (never {@code null}).
*
* @see #setNoDataMessagePaint(Paint)
* @see #getNoDataMessage()
*/
public Paint getNoDataMessagePaint() {
return this.noDataMessagePaint;
}
/**
* Sets the paint used to display the 'no data' message and sends a
* {@link PlotChangeEvent} to all registered listeners.
*
* @param paint the paint ({@code null} not permitted).
*
* @see #getNoDataMessagePaint()
*/
public void setNoDataMessagePaint(Paint paint) {
Args.nullNotPermitted(paint, "paint");
this.noDataMessagePaint = paint;
fireChangeEvent();
}
/**
* Returns a short string describing the plot type.
* <P>
* Note: this gets used in the chart property editing user interface,
* but there needs to be a better mechanism for identifying the plot type.
*
* @return A short string describing the plot type (never
* {@code null}).
*/
public abstract String getPlotType();
/**
* Returns the parent plot (or {@code null} if this plot is not part
* of a combined plot).
*
* @return The parent plot.
*
* @see #setParent(Plot)
* @see #getRootPlot()
*/
public Plot getParent() {
return this.parent;
}
/**
* Sets the parent plot. This method is intended for internal use, you
* shouldn't need to call it directly.
*
* @param parent the parent plot ({@code null} permitted).
*
* @see #getParent()
*/
public void setParent(Plot parent) {
this.parent = parent;
}
/**
* Returns the root plot.
*
* @return The root plot.
*
* @see #getParent()
*/
public Plot getRootPlot() {
Plot p = getParent();
if (p == null) {
return this;
}
return p.getRootPlot();
}
/**
* Returns {@code true} if this plot is part of a combined plot
* structure (that is, {@link #getParent()} returns a non-{@code null}
* value), and {@code false} otherwise.
*
* @return {@code true} if this plot is part of a combined plot
* structure.
*
* @see #getParent()
*/
public boolean isSubplot() {
return (getParent() != null);
}
/**
* Returns the insets for the plot area.
*
* @return The insets (never {@code null}).
*
* @see #setInsets(RectangleInsets)
*/
public RectangleInsets getInsets() {
return this.insets;
}
/**
* Sets the insets for the plot and sends a {@link PlotChangeEvent} to
* all registered listeners.
*
* @param insets the new insets ({@code null} not permitted).
*
* @see #getInsets()
* @see #setInsets(RectangleInsets, boolean)
*/
public void setInsets(RectangleInsets insets) {
setInsets(insets, true);
}
/**
* Sets the insets for the plot and, if requested, and sends a
* {@link PlotChangeEvent} to all registered listeners.
*
* @param insets the new insets ({@code null} not permitted).
* @param notify a flag that controls whether the registered listeners are
* notified.
*
* @see #getInsets()
* @see #setInsets(RectangleInsets)
*/
public void setInsets(RectangleInsets insets, boolean notify) {
Args.nullNotPermitted(insets, "insets");
if (!this.insets.equals(insets)) {
this.insets = insets;
if (notify) {
fireChangeEvent();
}
}
}
/**
* Returns the background color of the plot area.
*
* @return The paint (possibly {@code null}).
*
* @see #setBackgroundPaint(Paint)
*/
public Paint getBackgroundPaint() {
return this.backgroundPaint;
}
/**
* Sets the background color of the plot area and sends a
* {@link PlotChangeEvent} to all registered listeners.
*
* @param paint the paint ({@code null} permitted).
*
* @see #getBackgroundPaint()
*/
public void setBackgroundPaint(Paint paint) {
if (paint == null) {
if (this.backgroundPaint != null) {
this.backgroundPaint = null;
fireChangeEvent();
}
}
else {
if (this.backgroundPaint != null) {
if (this.backgroundPaint.equals(paint)) {
return; // nothing to do
}
}
this.backgroundPaint = paint;
fireChangeEvent();
}
}
/**
* Returns the alpha transparency of the plot area background.
*
* @return The alpha transparency.
*
* @see #setBackgroundAlpha(float)
*/
public float getBackgroundAlpha() {
return this.backgroundAlpha;
}
/**
* Sets the alpha transparency of the plot area background, and notifies
* registered listeners that the plot has been modified.
*
* @param alpha the new alpha value (in the range 0.0f to 1.0f).
*
* @see #getBackgroundAlpha()
*/
public void setBackgroundAlpha(float alpha) {
if (this.backgroundAlpha != alpha) {
this.backgroundAlpha = alpha;
fireChangeEvent();
}
}
/**
* Returns the drawing supplier for the plot.
*
* @return The drawing supplier (possibly {@code null}).
*
* @see #setDrawingSupplier(DrawingSupplier)
*/
public DrawingSupplier getDrawingSupplier() {
DrawingSupplier result;
Plot p = getParent();
if (p != null) {
result = p.getDrawingSupplier();
}
else {
result = this.drawingSupplier;
}
return result;
}
/**
* Sets the drawing supplier for the plot and sends a
* {@link PlotChangeEvent} to all registered listeners. The drawing
* supplier is responsible for supplying a limitless (possibly repeating)
* sequence of {@code Paint}, {@code Stroke} and
* {@code Shape} objects that the plot's renderer(s) can use to
* populate its (their) tables.
*
* @param supplier the new supplier.
*
* @see #getDrawingSupplier()
*/
public void setDrawingSupplier(DrawingSupplier supplier) {
this.drawingSupplier = supplier;
fireChangeEvent();
}
/**
* Sets the drawing supplier for the plot and, if requested, sends a
* {@link PlotChangeEvent} to all registered listeners. The drawing
* supplier is responsible for supplying a limitless (possibly repeating)
* sequence of {@code Paint}, {@code Stroke} and
* {@code Shape} objects that the plot's renderer(s) can use to
* populate its (their) tables.
*
* @param supplier the new supplier.
* @param notify notify listeners?
*
* @see #getDrawingSupplier()
*/
public void setDrawingSupplier(DrawingSupplier supplier, boolean notify) {
this.drawingSupplier = supplier;
if (notify) {
fireChangeEvent();
}
}
/**
* Returns the background image that is used to fill the plot's background
* area.
*
* @return The image (possibly {@code null}).
*
* @see #setBackgroundImage(Image)
*/
public Image getBackgroundImage() {
return this.backgroundImage;
}
/**
* Sets the background image for the plot and sends a
* {@link PlotChangeEvent} to all registered listeners.
*
* @param image the image ({@code null} permitted).
*
* @see #getBackgroundImage()
*/
public void setBackgroundImage(Image image) {
this.backgroundImage = image;
fireChangeEvent();
}
/**
* Returns the background image alignment. The default value is
* {@code RectangleAlignment.FILL}.
*
* @return The alignment (never {@code null}).
*
* @see #setBackgroundImageAlignment(RectangleAlignment)
*/
public RectangleAlignment getBackgroundImageAlignment() {
return this.backgroundImageAlignment;
}
/**
* Sets the alignment for the background image and sends a
* {@link PlotChangeEvent} to all registered listeners.
*
* @param alignment the alignment ({@code null} not permitted).
*
* @see #getBackgroundImageAlignment()
*/
public void setBackgroundImageAlignment(RectangleAlignment alignment) {
Args.nullNotPermitted(alignment, "alignment");
if (this.backgroundImageAlignment != alignment) {
this.backgroundImageAlignment = alignment;
fireChangeEvent();
}
}
/**
* Returns the alpha transparency used to draw the background image. This
* is a value in the range 0.0f to 1.0f, where 0.0f is fully transparent
* and 1.0f is fully opaque.
*
* @return The alpha transparency.
*
* @see #setBackgroundImageAlpha(float)
*/
public float getBackgroundImageAlpha() {
return this.backgroundImageAlpha;
}
/**
* Sets the alpha transparency used when drawing the background image.
*
* @param alpha the alpha transparency (in the range 0.0f to 1.0f, where
* 0.0f is fully transparent, and 1.0f is fully opaque).
*
* @throws IllegalArgumentException if {@code alpha} is not within
* the specified range.
*
* @see #getBackgroundImageAlpha()
*/
public void setBackgroundImageAlpha(float alpha) {
if (alpha < 0.0f || alpha > 1.0f) {
throw new IllegalArgumentException(
"The 'alpha' value must be in the range 0.0f to 1.0f.");
}
if (this.backgroundImageAlpha != alpha) {
this.backgroundImageAlpha = alpha;
fireChangeEvent();
}
}
/**
* Returns the flag that controls whether or not the plot outline is
* drawn. The default value is {@code true}. Note that for
* historical reasons, the plot's outline paint and stroke can take on
* {@code null} values, in which case the outline will not be drawn
* even if this flag is set to {@code true}.
*
* @return The outline visibility flag.
*
* @see #setOutlineVisible(boolean)
*/
public boolean isOutlineVisible() {
return this.outlineVisible;
}
/**
* Sets the flag that controls whether or not the plot's outline is
* drawn, and sends a {@link PlotChangeEvent} to all registered listeners.
*
* @param visible the new flag value.
*
* @see #isOutlineVisible()
*/
public void setOutlineVisible(boolean visible) {
this.outlineVisible = visible;
fireChangeEvent();
}
/**
* Returns the stroke used to outline the plot area.
*
* @return The stroke (possibly {@code null}).
*
* @see #setOutlineStroke(Stroke)
*/
public Stroke getOutlineStroke() {
return this.outlineStroke;
}
/**
* Sets the stroke used to outline the plot area and sends a
* {@link PlotChangeEvent} to all registered listeners. If you set this
* attribute to {@code null}, no outline will be drawn.
*
* @param stroke the stroke ({@code null} permitted).
*
* @see #getOutlineStroke()
*/
public void setOutlineStroke(Stroke stroke) {
if (stroke == null) {
if (this.outlineStroke != null) {
this.outlineStroke = null;
fireChangeEvent();
}
}
else {
if (this.outlineStroke != null) {
if (this.outlineStroke.equals(stroke)) {
return; // nothing to do
}
}
this.outlineStroke = stroke;
fireChangeEvent();
}
}
/**
* Returns the color used to draw the outline of the plot area.
*
* @return The color (possibly {@code null}).
*
* @see #setOutlinePaint(Paint)
*/
public Paint getOutlinePaint() {
return this.outlinePaint;
}
/**
* Sets the paint used to draw the outline of the plot area and sends a
* {@link PlotChangeEvent} to all registered listeners. If you set this
* attribute to {@code null}, no outline will be drawn.
*
* @param paint the paint ({@code null} permitted).
*
* @see #getOutlinePaint()
*/
public void setOutlinePaint(Paint paint) {
if (paint == null) {
if (this.outlinePaint != null) {
this.outlinePaint = null;
fireChangeEvent();
}
}
else {
if (this.outlinePaint != null) {
if (this.outlinePaint.equals(paint)) {
return; // nothing to do
}
}
this.outlinePaint = paint;
fireChangeEvent();
}
}
/**
* Returns the alpha-transparency for the plot foreground.
*
* @return The alpha-transparency.
*
* @see #setForegroundAlpha(float)
*/
public float getForegroundAlpha() {
return this.foregroundAlpha;
}
/**
* Sets the alpha-transparency for the plot and sends a
* {@link PlotChangeEvent} to all registered listeners.
*
* @param alpha the new alpha transparency.
*
* @see #getForegroundAlpha()
*/
public void setForegroundAlpha(float alpha) {
if (this.foregroundAlpha != alpha) {
this.foregroundAlpha = alpha;
fireChangeEvent();
}
}
/**
* Returns the legend items for the plot. By default, this method returns
* {@code null}. Subclasses should override to return a
* {@link LegendItemCollection}.
*
* @return The legend items for the plot (possibly {@code null}).
*/
@Override
public LegendItemCollection getLegendItems() {
return null;
}
/**
* Returns a flag that controls whether or not change events are sent to
* registered listeners.
*
* @return A boolean.
*
* @see #setNotify(boolean)
*/
public boolean isNotify() {
return this.notify;
}
/**
* Sets a flag that controls whether or not listeners receive
* {@link PlotChangeEvent} notifications.
*
* @param notify a boolean.
*
* @see #isNotify()
*/
public void setNotify(boolean notify) {
this.notify = notify;
// if the flag is being set to true, there may be queued up changes...
if (notify) {
notifyListeners(new PlotChangeEvent(this));
}
}
/**
* Registers an object for notification of changes to the plot.
*
* @param listener the object to be registered.
*
* @see #removeChangeListener(PlotChangeListener)
*/
public void addChangeListener(PlotChangeListener listener) {
this.listenerList.add(PlotChangeListener.class, listener);
}
/**
* Unregisters an object for notification of changes to the plot.
*
* @param listener the object to be unregistered.
*
* @see #addChangeListener(PlotChangeListener)
*/
public void removeChangeListener(PlotChangeListener listener) {
this.listenerList.remove(PlotChangeListener.class, listener);
}
/**
* Notifies all registered listeners that the plot has been modified.
*
* @param event information about the change event.
*/
public void notifyListeners(PlotChangeEvent event) {
// if the 'notify' flag has been switched to false, we don't notify
// the listeners
if (!this.notify) {
return;
}
Object[] listeners = this.listenerList.getListenerList();
for (int i = listeners.length - 2; i >= 0; i -= 2) {
if (listeners[i] == PlotChangeListener.class) {
((PlotChangeListener) listeners[i + 1]).plotChanged(event);
}
}
}
/**
* Sends a {@link PlotChangeEvent} to all registered listeners.
*/
protected void fireChangeEvent() {
notifyListeners(new PlotChangeEvent(this));
}
/**
* Receives a chart element visitor. Many plot subclasses will override
* this method to handle their subcomponents.
*
* @param visitor the visitor ({@code null} not permitted).
*/
@Override
public void receive(ChartElementVisitor visitor) {
visitor.visit(this);
}
/**
* Draws the plot within the specified area. The anchor is a point on the
* chart that is specified externally (for instance, it may be the last
* point of the last mouse click performed by the user) - plots can use or
* ignore this value as they see fit.
* <br><br>
* Subclasses need to provide an implementation of this method, obviously.
*
* @param g2 the graphics device.
* @param area the plot area.
* @param anchor the anchor point ({@code null} permitted).
* @param parentState the parent state (if any, {@code null} permitted).
* @param info carries back plot rendering info.
*/
public abstract void draw(Graphics2D g2, Rectangle2D area, Point2D anchor,
PlotState parentState, PlotRenderingInfo info);
/**
* Draws the plot background (the background color and/or image).
* <P>
* This method will be called during the chart drawing process and is
* declared public so that it can be accessed by the renderers used by
* certain subclasses. You shouldn't need to call this method directly.
*
* @param g2 the graphics device.
* @param area the area within which the plot should be drawn.
*/
public void drawBackground(Graphics2D g2, Rectangle2D area) {
// some subclasses override this method completely, so don't put
// anything here that *must* be done
fillBackground(g2, area);
drawBackgroundImage(g2, area);
}
/**
* Fills the specified area with the background paint.
*
* @param g2 the graphics device.
* @param area the area.
*
* @see #getBackgroundPaint()
* @see #getBackgroundAlpha()
* @see #fillBackground(Graphics2D, Rectangle2D, PlotOrientation)
*/
protected void fillBackground(Graphics2D g2, Rectangle2D area) {
fillBackground(g2, area, PlotOrientation.VERTICAL);
}
/**
* Fills the specified area with the background paint. If the background
* paint is an instance of {@code GradientPaint}, the gradient will
* run in the direction suggested by the plot's orientation.
*
* @param g2 the graphics target.
* @param area the plot area.
* @param orientation the plot orientation ({@code null} not permitted).
*/
protected void fillBackground(Graphics2D g2, Rectangle2D area,
PlotOrientation orientation) {
Args.nullNotPermitted(orientation, "orientation");
if (this.backgroundPaint == null) {
return;
}
Paint p = this.backgroundPaint;
if (p instanceof GradientPaint) {
GradientPaint gp = (GradientPaint) p;
if (orientation == PlotOrientation.VERTICAL) {
p = new GradientPaint((float) area.getCenterX(),
(float) area.getMaxY(), gp.getColor1(),
(float) area.getCenterX(), (float) area.getMinY(),
gp.getColor2());
}
else if (orientation == PlotOrientation.HORIZONTAL) {
p = new GradientPaint((float) area.getMinX(),
(float) area.getCenterY(), gp.getColor1(),
(float) area.getMaxX(), (float) area.getCenterY(),
gp.getColor2());
}
}
Composite originalComposite = g2.getComposite();
g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,
this.backgroundAlpha));
g2.setPaint(p);
g2.fill(area);
g2.setComposite(originalComposite);
}
/**
* Draws the background image (if there is one) aligned within the
* specified area.
*
* @param g2 the graphics device.
* @param area the area.
*
* @see #getBackgroundImage()
* @see #getBackgroundImageAlignment()
* @see #getBackgroundImageAlpha()
*/
public void drawBackgroundImage(Graphics2D g2, Rectangle2D area) {
if (this.backgroundImage == null) {
return; // nothing to do
}
Composite savedComposite = g2.getComposite();
g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,
this.backgroundImageAlpha));
Rectangle2D dest = new Rectangle2D.Double(0.0, 0.0,
this.backgroundImage.getWidth(null),
this.backgroundImage.getHeight(null));
this.backgroundImageAlignment.align(dest, area);
Shape savedClip = g2.getClip();
g2.clip(area);
g2.drawImage(this.backgroundImage, (int) dest.getX(),
(int) dest.getY(), (int) dest.getWidth() + 1,
(int) dest.getHeight() + 1, null);
g2.setClip(savedClip);
g2.setComposite(savedComposite);
}
/**
* Draws the plot outline. This method will be called during the chart
* drawing process and is declared public so that it can be accessed by the
* renderers used by certain subclasses. You shouldn't need to call this
* method directly.
*
* @param g2 the graphics device.
* @param area the area within which the plot should be drawn.
*/
public void drawOutline(Graphics2D g2, Rectangle2D area) {
if (!this.outlineVisible) {
return;
}
if ((this.outlineStroke != null) && (this.outlinePaint != null)) {
g2.setStroke(this.outlineStroke);
g2.setPaint(this.outlinePaint);
Object saved = g2.getRenderingHint(RenderingHints.KEY_STROKE_CONTROL);
g2.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_NORMALIZE);
g2.draw(area);
g2.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, saved);
}
}
/**
* Draws a message to state that there is no data to plot.
*
* @param g2 the graphics device.
* @param area the area within which the plot should be drawn.
*/
protected void drawNoDataMessage(Graphics2D g2, Rectangle2D area) {
Shape savedClip = g2.getClip();
g2.clip(area);
String message = this.noDataMessage;
if (message != null) {
g2.setFont(this.noDataMessageFont);
g2.setPaint(this.noDataMessagePaint);
TextBlock block = TextUtils.createTextBlock(
this.noDataMessage, this.noDataMessageFont,
this.noDataMessagePaint, 0.9f * (float) area.getWidth(),
new G2TextMeasurer(g2));
block.draw(g2, (float) area.getCenterX(),
(float) area.getCenterY(), TextBlockAnchor.CENTER);
}
g2.setClip(savedClip);
}
/**
* Creates a plot entity that contains a reference to the plot and the
* data area as shape.
*
* @param dataArea the data area used as hot spot for the entity.
* @param plotState the plot rendering info containing a reference to the
* EntityCollection.
* @param toolTip the tool tip (defined in the respective Plot
* subclass) ({@code null} permitted).
* @param urlText the url (defined in the respective Plot subclass)
* ({@code null} permitted).
*/
protected void createAndAddEntity(Rectangle2D dataArea,
PlotRenderingInfo plotState, String toolTip, String urlText) {
if (plotState != null && plotState.getOwner() != null) {
EntityCollection e = plotState.getOwner().getEntityCollection();
if (e != null) {
e.add(new PlotEntity(dataArea, this, toolTip, urlText));
}
}
}
/**
* Handles a 'click' on the plot. Since the plot does not maintain any
* information about where it has been drawn, the plot rendering info is
* supplied as an argument so that the plot dimensions can be determined.
*
* @param x the x coordinate (in Java2D space).
* @param y the y coordinate (in Java2D space).
* @param info an object containing information about the dimensions of
* the plot.
*/
public void handleClick(int x, int y, PlotRenderingInfo info) {
// provides a 'no action' default
}
/**
* Performs a zoom on the plot. Subclasses should override if zooming is
* appropriate for the type of plot.
*
* @param percent the zoom percentage.
*/
public void zoom(double percent) {
// do nothing by default.
}
/**
* Receives notification of a change to an {@link Annotation} added to
* this plot.
*
* @param event information about the event (not used here).
*/
@Override
public void annotationChanged(AnnotationChangeEvent event) {
fireChangeEvent();
}
/**
* Receives notification of a change to one of the plot's axes.
*
* @param event information about the event (not used here).
*/
@Override
public void axisChanged(AxisChangeEvent event) {
fireChangeEvent();
}
/**
* Receives notification of a change to the plot's dataset.
* <P>
* The plot reacts by passing on a plot change event to all registered
* listeners.
*
* @param event information about the event (not used here).
*/
@Override
public void datasetChanged(DatasetChangeEvent event) {
PlotChangeEvent newEvent = new PlotChangeEvent(this);
newEvent.setType(ChartChangeEventType.DATASET_UPDATED);
notifyListeners(newEvent);
}
/**
* Receives notification of a change to a marker that is assigned to the
* plot.
*
* @param event the event.
*/
@Override
public void markerChanged(MarkerChangeEvent event) {
fireChangeEvent();
}
/**
* Adjusts the supplied x-value.
*
* @param x the x-value.
* @param w1 width 1.
* @param w2 width 2.
* @param edge the edge (left or right).
*
* @return The adjusted x-value.
*/
protected double getRectX(double x, double w1, double w2,
RectangleEdge edge) {
double result = x;
if (edge == RectangleEdge.LEFT) {
result = result + w1;
}
else if (edge == RectangleEdge.RIGHT) {
result = result + w2;
}
return result;
}
/**
* Adjusts the supplied y-value.
*
* @param y the x-value.
* @param h1 height 1.
* @param h2 height 2.
* @param edge the edge (top or bottom).
*
* @return The adjusted y-value.
*/
protected double getRectY(double y, double h1, double h2,
RectangleEdge edge) {
double result = y;
if (edge == RectangleEdge.TOP) {
result = result + h1;
}
else if (edge == RectangleEdge.BOTTOM) {
result = result + h2;
}
return result;
}
/**
* Tests this plot for equality with another object.
*
* @param obj the object ({@code null} permitted).
*
* @return {@code true} or {@code false}.
*/
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof Plot)) {
return false;
}
Plot that = (Plot) obj;
if (!Objects.equals(this.noDataMessage, that.noDataMessage)) {
return false;
}
if (!Objects.equals(this.noDataMessageFont, that.noDataMessageFont)) {
return false;
}
if (!PaintUtils.equal(this.noDataMessagePaint,
that.noDataMessagePaint)) {
return false;
}
if (!Objects.equals(this.insets, that.insets)) {
return false;
}
if (this.outlineVisible != that.outlineVisible) {
return false;
}
if (!Objects.equals(this.outlineStroke, that.outlineStroke)) {
return false;
}
if (!PaintUtils.equal(this.outlinePaint, that.outlinePaint)) {
return false;
}
if (!PaintUtils.equal(this.backgroundPaint, that.backgroundPaint)) {
return false;
}
if (!Objects.equals(this.backgroundImage, that.backgroundImage)) {
return false;
}
if (this.backgroundImageAlignment != that.backgroundImageAlignment) {
return false;
}
if (this.backgroundImageAlpha != that.backgroundImageAlpha) {
return false;
}
if (this.foregroundAlpha != that.foregroundAlpha) {
return false;
}
if (this.backgroundAlpha != that.backgroundAlpha) {
return false;
}
if (!this.drawingSupplier.equals(that.drawingSupplier)) {
return false;
}
if (this.notify != that.notify) {
return false;
}
return true;
}
/**
* Creates a clone of the plot.
*
* @return A clone.
*
* @throws CloneNotSupportedException if some component of the plot does not
* support cloning.
*/
@Override
public Object clone() throws CloneNotSupportedException {
Plot clone = (Plot) super.clone();
// private Plot parent <-- don't clone the parent plot, but take care
// childs in combined plots instead
clone.drawingSupplier = CloneUtils.clone(this.drawingSupplier);
clone.listenerList = new EventListenerList();
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.writePaint(this.noDataMessagePaint, stream);
SerialUtils.writeStroke(this.outlineStroke, stream);
SerialUtils.writePaint(this.outlinePaint, stream);
// backgroundImage
SerialUtils.writePaint(this.backgroundPaint, 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.noDataMessagePaint = SerialUtils.readPaint(stream);
this.outlineStroke = SerialUtils.readStroke(stream);
this.outlinePaint = SerialUtils.readPaint(stream);
// backgroundImage
this.backgroundPaint = SerialUtils.readPaint(stream);
this.listenerList = new EventListenerList();
}
/**
* Resolves a domain axis location for a given plot orientation.
*
* @param location the location ({@code null} not permitted).
* @param orientation the orientation ({@code null} not permitted).
*
* @return The edge (never {@code null}).
*/
public static RectangleEdge resolveDomainAxisLocation(
AxisLocation location, PlotOrientation orientation) {
Args.nullNotPermitted(location, "location");
Args.nullNotPermitted(orientation, "orientation");
RectangleEdge result = null;
switch (location) {
case TOP_OR_RIGHT:
if (orientation == PlotOrientation.HORIZONTAL) {
result = RectangleEdge.RIGHT;
}
else if (orientation == PlotOrientation.VERTICAL) {
result = RectangleEdge.TOP;
} break;
case TOP_OR_LEFT:
if (orientation == PlotOrientation.HORIZONTAL) {
result = RectangleEdge.LEFT;
}
else if (orientation == PlotOrientation.VERTICAL) {
result = RectangleEdge.TOP;
} break;
case BOTTOM_OR_RIGHT:
if (orientation == PlotOrientation.HORIZONTAL) {
result = RectangleEdge.RIGHT;
}
else if (orientation == PlotOrientation.VERTICAL) {
result = RectangleEdge.BOTTOM;
} break;
case BOTTOM_OR_LEFT:
if (orientation == PlotOrientation.HORIZONTAL) {
result = RectangleEdge.LEFT;
}
else if (orientation == PlotOrientation.VERTICAL) {
result = RectangleEdge.BOTTOM;
} break;
default:
break;
}
// the above should cover all the options...
if (result == null) {
throw new IllegalStateException("resolveDomainAxisLocation()");
}
return result;
}
/**
* Resolves a range axis location for a given plot orientation.
*
* @param location the location ({@code null} not permitted).
* @param orientation the orientation ({@code null} not permitted).
*
* @return The edge (never {@code null}).
*/
public static RectangleEdge resolveRangeAxisLocation(
AxisLocation location, PlotOrientation orientation) {
Args.nullNotPermitted(location, "location");
Args.nullNotPermitted(orientation, "orientation");
RectangleEdge result = null;
switch (location) {
case TOP_OR_RIGHT:
if (orientation == PlotOrientation.HORIZONTAL) {
result = RectangleEdge.TOP;
}
else if (orientation == PlotOrientation.VERTICAL) {
result = RectangleEdge.RIGHT;
} break;
case TOP_OR_LEFT:
if (orientation == PlotOrientation.HORIZONTAL) {
result = RectangleEdge.TOP;
}
else if (orientation == PlotOrientation.VERTICAL) {
result = RectangleEdge.LEFT;
} break;
case BOTTOM_OR_RIGHT:
if (orientation == PlotOrientation.HORIZONTAL) {
result = RectangleEdge.BOTTOM;
}
else if (orientation == PlotOrientation.VERTICAL) {
result = RectangleEdge.RIGHT;
} break;
case BOTTOM_OR_LEFT:
if (orientation == PlotOrientation.HORIZONTAL) {
result = RectangleEdge.BOTTOM;
}
else if (orientation == PlotOrientation.VERTICAL) {
result = RectangleEdge.LEFT;
} break;
default:
break;
}
// the above should cover all the options...
if (result == null) {
throw new IllegalStateException("resolveRangeAxisLocation()");
}
return result;
}
}