jfreechart example source code file (PaintScaleLegend.java)
The jfreechart PaintScaleLegend.java source code/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2009, 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.]
*
* ---------------------
* PaintScaleLegend.java
* ---------------------
* (C) Copyright 2007-2009, by Object Refinery Limited.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): Peter Kolb - see patch 2686872;
*
* Changes
* -------
* 22-Jan-2007 : Version 1 (DG);
* 18-Jun-2008 : Fixed bug drawing scale with log axis (DG);
* 16-Apr-2009 : Patch 2686872 implementing AxisChangeListener, and fix for
* ignored stripOutlineVisible flag (DG);
*
*/
package org.jfree.chart.title;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Stroke;
import java.awt.geom.Rectangle2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import org.jfree.chart.axis.AxisLocation;
import org.jfree.chart.axis.AxisSpace;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.block.LengthConstraintType;
import org.jfree.chart.block.RectangleConstraint;
import org.jfree.chart.event.AxisChangeEvent;
import org.jfree.chart.event.AxisChangeListener;
import org.jfree.chart.event.TitleChangeEvent;
import org.jfree.chart.plot.Plot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.PaintScale;
import org.jfree.data.Range;
import org.jfree.io.SerialUtilities;
import org.jfree.ui.RectangleEdge;
import org.jfree.ui.Size2D;
import org.jfree.util.PaintUtilities;
import org.jfree.util.PublicCloneable;
/**
* A legend that shows a range of values and their associated colors, driven
* by an underlying {@link PaintScale} implementation.
*
* @since 1.0.4
*/
public class PaintScaleLegend extends Title implements AxisChangeListener,
PublicCloneable {
/** For serialization. */
static final long serialVersionUID = -1365146490993227503L;
/** The paint scale (never <code>null). */
private PaintScale scale;
/** The value axis (never <code>null). */
private ValueAxis axis;
/**
* The axis location (handles both orientations, never
* <code>null).
*/
private AxisLocation axisLocation;
/** The offset between the axis and the paint strip (in Java2D units). */
private double axisOffset;
/** The thickness of the paint strip (in Java2D units). */
private double stripWidth;
/**
* A flag that controls whether or not an outline is drawn around the
* paint strip.
*/
private boolean stripOutlineVisible;
/** The paint used to draw an outline around the paint strip. */
private transient Paint stripOutlinePaint;
/** The stroke used to draw an outline around the paint strip. */
private transient Stroke stripOutlineStroke;
/** The background paint (never <code>null). */
private transient Paint backgroundPaint;
/**
* The number of subdivisions for the scale when rendering.
*
* @since 1.0.11
*/
private int subdivisions;
/**
* Creates a new instance.
*
* @param scale the scale (<code>null not permitted).
* @param axis the axis (<code>null not permitted).
*/
public PaintScaleLegend(PaintScale scale, ValueAxis axis) {
if (axis == null) {
throw new IllegalArgumentException("Null 'axis' argument.");
}
this.scale = scale;
this.axis = axis;
this.axis.addChangeListener(this);
this.axisLocation = AxisLocation.BOTTOM_OR_LEFT;
this.axisOffset = 0.0;
this.axis.setRange(scale.getLowerBound(), scale.getUpperBound());
this.stripWidth = 15.0;
this.stripOutlineVisible = true;
this.stripOutlinePaint = Color.gray;
this.stripOutlineStroke = new BasicStroke(0.5f);
this.backgroundPaint = Color.white;
this.subdivisions = 100;
}
/**
* Returns the scale used to convert values to colors.
*
* @return The scale (never <code>null).
*
* @see #setScale(PaintScale)
*/
public PaintScale getScale() {
return this.scale;
}
/**
* Sets the scale and sends a {@link TitleChangeEvent} to all registered
* listeners.
*
* @param scale the scale (<code>null not permitted).
*
* @see #getScale()
*/
public void setScale(PaintScale scale) {
if (scale == null) {
throw new IllegalArgumentException("Null 'scale' argument.");
}
this.scale = scale;
notifyListeners(new TitleChangeEvent(this));
}
/**
* Returns the axis for the paint scale.
*
* @return The axis (never <code>null).
*
* @see #setAxis(ValueAxis)
*/
public ValueAxis getAxis() {
return this.axis;
}
/**
* Sets the axis for the paint scale and sends a {@link TitleChangeEvent}
* to all registered listeners.
*
* @param axis the axis (<code>null not permitted).
*
* @see #getAxis()
*/
public void setAxis(ValueAxis axis) {
if (axis == null) {
throw new IllegalArgumentException("Null 'axis' argument.");
}
this.axis.removeChangeListener(this);
this.axis = axis;
this.axis.addChangeListener(this);
notifyListeners(new TitleChangeEvent(this));
}
/**
* Returns the axis location.
*
* @return The axis location (never <code>null).
*
* @see #setAxisLocation(AxisLocation)
*/
public AxisLocation getAxisLocation() {
return this.axisLocation;
}
/**
* Sets the axis location and sends a {@link TitleChangeEvent} to all
* registered listeners.
*
* @param location the location (<code>null not permitted).
*
* @see #getAxisLocation()
*/
public void setAxisLocation(AxisLocation location) {
if (location == null) {
throw new IllegalArgumentException("Null 'location' argument.");
}
this.axisLocation = location;
notifyListeners(new TitleChangeEvent(this));
}
/**
* Returns the offset between the axis and the paint strip.
*
* @return The offset between the axis and the paint strip.
*
* @see #setAxisOffset(double)
*/
public double getAxisOffset() {
return this.axisOffset;
}
/**
* Sets the offset between the axis and the paint strip and sends a
* {@link TitleChangeEvent} to all registered listeners.
*
* @param offset the offset.
*/
public void setAxisOffset(double offset) {
this.axisOffset = offset;
notifyListeners(new TitleChangeEvent(this));
}
/**
* Returns the width of the paint strip, in Java2D units.
*
* @return The width of the paint strip.
*
* @see #setStripWidth(double)
*/
public double getStripWidth() {
return this.stripWidth;
}
/**
* Sets the width of the paint strip and sends a {@link TitleChangeEvent}
* to all registered listeners.
*
* @param width the width.
*
* @see #getStripWidth()
*/
public void setStripWidth(double width) {
this.stripWidth = width;
notifyListeners(new TitleChangeEvent(this));
}
/**
* Returns the flag that controls whether or not an outline is drawn
* around the paint strip.
*
* @return A boolean.
*
* @see #setStripOutlineVisible(boolean)
*/
public boolean isStripOutlineVisible() {
return this.stripOutlineVisible;
}
/**
* Sets the flag that controls whether or not an outline is drawn around
* the paint strip, and sends a {@link TitleChangeEvent} to all registered
* listeners.
*
* @param visible the flag.
*
* @see #isStripOutlineVisible()
*/
public void setStripOutlineVisible(boolean visible) {
this.stripOutlineVisible = visible;
notifyListeners(new TitleChangeEvent(this));
}
/**
* Returns the paint used to draw the outline of the paint strip.
*
* @return The paint (never <code>null).
*
* @see #setStripOutlinePaint(Paint)
*/
public Paint getStripOutlinePaint() {
return this.stripOutlinePaint;
}
/**
* Sets the paint used to draw the outline of the paint strip, and sends
* a {@link TitleChangeEvent} to all registered listeners.
*
* @param paint the paint (<code>null not permitted).
*
* @see #getStripOutlinePaint()
*/
public void setStripOutlinePaint(Paint paint) {
if (paint == null) {
throw new IllegalArgumentException("Null 'paint' argument.");
}
this.stripOutlinePaint = paint;
notifyListeners(new TitleChangeEvent(this));
}
/**
* Returns the stroke used to draw the outline around the paint strip.
*
* @return The stroke (never <code>null).
*
* @see #setStripOutlineStroke(Stroke)
*/
public Stroke getStripOutlineStroke() {
return this.stripOutlineStroke;
}
/**
* Sets the stroke used to draw the outline around the paint strip and
* sends a {@link TitleChangeEvent} to all registered listeners.
*
* @param stroke the stroke (<code>null not permitted).
*
* @see #getStripOutlineStroke()
*/
public void setStripOutlineStroke(Stroke stroke) {
if (stroke == null) {
throw new IllegalArgumentException("Null 'stroke' argument.");
}
this.stripOutlineStroke = stroke;
notifyListeners(new TitleChangeEvent(this));
}
/**
* Returns the background paint.
*
* @return The background paint.
*/
public Paint getBackgroundPaint() {
return this.backgroundPaint;
}
/**
* Sets the background paint and sends a {@link TitleChangeEvent} to all
* registered listeners.
*
* @param paint the paint (<code>null permitted).
*/
public void setBackgroundPaint(Paint paint) {
this.backgroundPaint = paint;
notifyListeners(new TitleChangeEvent(this));
}
/**
* Returns the number of subdivisions used to draw the scale.
*
* @return The subdivision count.
*
* @since 1.0.11
*/
public int getSubdivisionCount() {
return this.subdivisions;
}
/**
* Sets the subdivision count and sends a {@link TitleChangeEvent} to
* all registered listeners.
*
* @param count the count.
*
* @since 1.0.11
*/
public void setSubdivisionCount(int count) {
if (count <= 0) {
throw new IllegalArgumentException("Requires 'count' > 0.");
}
this.subdivisions = count;
notifyListeners(new TitleChangeEvent(this));
}
/**
* Receives notification of an axis change event and responds by firing
* a title change event.
*
* @param event the event.
*
* @since 1.0.13
*/
public void axisChanged(AxisChangeEvent event) {
if (this.axis == event.getAxis()) {
notifyListeners(new TitleChangeEvent(this));
}
}
/**
* Arranges the contents of the block, within the given constraints, and
* returns the block size.
*
* @param g2 the graphics device.
* @param constraint the constraint (<code>null not permitted).
*
* @return The block size (in Java2D units, never <code>null).
*/
public Size2D arrange(Graphics2D g2, RectangleConstraint constraint) {
RectangleConstraint cc = toContentConstraint(constraint);
LengthConstraintType w = cc.getWidthConstraintType();
LengthConstraintType h = cc.getHeightConstraintType();
Size2D contentSize = null;
if (w == LengthConstraintType.NONE) {
if (h == LengthConstraintType.NONE) {
contentSize = new Size2D(getWidth(), getHeight());
}
else if (h == LengthConstraintType.RANGE) {
throw new RuntimeException("Not yet implemented.");
}
else if (h == LengthConstraintType.FIXED) {
throw new RuntimeException("Not yet implemented.");
}
}
else if (w == LengthConstraintType.RANGE) {
if (h == LengthConstraintType.NONE) {
throw new RuntimeException("Not yet implemented.");
}
else if (h == LengthConstraintType.RANGE) {
contentSize = arrangeRR(g2, cc.getWidthRange(),
cc.getHeightRange());
}
else if (h == LengthConstraintType.FIXED) {
throw new RuntimeException("Not yet implemented.");
}
}
else if (w == LengthConstraintType.FIXED) {
if (h == LengthConstraintType.NONE) {
throw new RuntimeException("Not yet implemented.");
}
else if (h == LengthConstraintType.RANGE) {
throw new RuntimeException("Not yet implemented.");
}
else if (h == LengthConstraintType.FIXED) {
throw new RuntimeException("Not yet implemented.");
}
}
return new Size2D(calculateTotalWidth(contentSize.getWidth()),
calculateTotalHeight(contentSize.getHeight()));
}
/**
* Returns the content size for the title. This will reflect the fact that
* a text title positioned on the left or right of a chart will be rotated
* 90 degrees.
*
* @param g2 the graphics device.
* @param widthRange the width range.
* @param heightRange the height range.
*
* @return The content size.
*/
protected Size2D arrangeRR(Graphics2D g2, Range widthRange,
Range heightRange) {
RectangleEdge position = getPosition();
if (position == RectangleEdge.TOP || position == RectangleEdge.BOTTOM) {
float maxWidth = (float) widthRange.getUpperBound();
// determine the space required for the axis
AxisSpace space = this.axis.reserveSpace(g2, null,
new Rectangle2D.Double(0, 0, maxWidth, 100),
RectangleEdge.BOTTOM, null);
return new Size2D(maxWidth, this.stripWidth + this.axisOffset
+ space.getTop() + space.getBottom());
}
else if (position == RectangleEdge.LEFT || position
== RectangleEdge.RIGHT) {
float maxHeight = (float) heightRange.getUpperBound();
AxisSpace space = this.axis.reserveSpace(g2, null,
new Rectangle2D.Double(0, 0, 100, maxHeight),
RectangleEdge.RIGHT, null);
return new Size2D(this.stripWidth + this.axisOffset
+ space.getLeft() + space.getRight(), maxHeight);
}
else {
throw new RuntimeException("Unrecognised position.");
}
}
/**
* Draws the legend within the specified area.
*
* @param g2 the graphics target (<code>null not permitted).
* @param area the drawing area (<code>null not permitted).
*/
public void draw(Graphics2D g2, Rectangle2D area) {
draw(g2, area, null);
}
/**
* Draws the legend within the specified area.
*
* @param g2 the graphics target (<code>null not permitted).
* @param area the drawing area (<code>null not permitted).
* @param params drawing parameters (ignored here).
*
* @return <code>null.
*/
public Object draw(Graphics2D g2, Rectangle2D area, Object params) {
Rectangle2D target = (Rectangle2D) area.clone();
target = trimMargin(target);
if (this.backgroundPaint != null) {
g2.setPaint(this.backgroundPaint);
g2.fill(target);
}
getFrame().draw(g2, target);
getFrame().getInsets().trim(target);
target = trimPadding(target);
double base = this.axis.getLowerBound();
double increment = this.axis.getRange().getLength() / this.subdivisions;
Rectangle2D r = new Rectangle2D.Double();
if (RectangleEdge.isTopOrBottom(getPosition())) {
RectangleEdge axisEdge = Plot.resolveRangeAxisLocation(
this.axisLocation, PlotOrientation.HORIZONTAL);
if (axisEdge == RectangleEdge.TOP) {
for (int i = 0; i < this.subdivisions; i++) {
double v = base + (i * increment);
Paint p = this.scale.getPaint(v);
double vv0 = this.axis.valueToJava2D(v, target,
RectangleEdge.TOP);
double vv1 = this.axis.valueToJava2D(v + increment, target,
RectangleEdge.TOP);
double ww = Math.abs(vv1 - vv0) + 1.0;
r.setRect(Math.min(vv0, vv1), target.getMaxY()
- this.stripWidth, ww, this.stripWidth);
g2.setPaint(p);
g2.fill(r);
}
if (isStripOutlineVisible()) {
g2.setPaint(this.stripOutlinePaint);
g2.setStroke(this.stripOutlineStroke);
g2.draw(new Rectangle2D.Double(target.getMinX(),
target.getMaxY() - this.stripWidth,
target.getWidth(), this.stripWidth));
}
this.axis.draw(g2, target.getMaxY() - this.stripWidth
- this.axisOffset, target, target, RectangleEdge.TOP,
null);
}
else if (axisEdge == RectangleEdge.BOTTOM) {
for (int i = 0; i < this.subdivisions; i++) {
double v = base + (i * increment);
Paint p = this.scale.getPaint(v);
double vv0 = this.axis.valueToJava2D(v, target,
RectangleEdge.BOTTOM);
double vv1 = this.axis.valueToJava2D(v + increment, target,
RectangleEdge.BOTTOM);
double ww = Math.abs(vv1 - vv0) + 1.0;
r.setRect(Math.min(vv0, vv1), target.getMinY(), ww,
this.stripWidth);
g2.setPaint(p);
g2.fill(r);
}
if (isStripOutlineVisible()) {
g2.setPaint(this.stripOutlinePaint);
g2.setStroke(this.stripOutlineStroke);
g2.draw(new Rectangle2D.Double(target.getMinX(),
target.getMinY(), target.getWidth(),
this.stripWidth));
}
this.axis.draw(g2, target.getMinY() + this.stripWidth
+ this.axisOffset, target, target,
RectangleEdge.BOTTOM, null);
}
}
else {
RectangleEdge axisEdge = Plot.resolveRangeAxisLocation(
this.axisLocation, PlotOrientation.VERTICAL);
if (axisEdge == RectangleEdge.LEFT) {
for (int i = 0; i < this.subdivisions; i++) {
double v = base + (i * increment);
Paint p = this.scale.getPaint(v);
double vv0 = this.axis.valueToJava2D(v, target,
RectangleEdge.LEFT);
double vv1 = this.axis.valueToJava2D(v + increment, target,
RectangleEdge.LEFT);
double hh = Math.abs(vv1 - vv0) + 1.0;
r.setRect(target.getMaxX() - this.stripWidth,
Math.min(vv0, vv1), this.stripWidth, hh);
g2.setPaint(p);
g2.fill(r);
}
if (isStripOutlineVisible()) {
g2.setPaint(this.stripOutlinePaint);
g2.setStroke(this.stripOutlineStroke);
g2.draw(new Rectangle2D.Double(target.getMaxX()
- this.stripWidth, target.getMinY(), this.stripWidth,
target.getHeight()));
}
this.axis.draw(g2, target.getMaxX() - this.stripWidth
- this.axisOffset, target, target, RectangleEdge.LEFT,
null);
}
else if (axisEdge == RectangleEdge.RIGHT) {
for (int i = 0; i < this.subdivisions; i++) {
double v = base + (i * increment);
Paint p = this.scale.getPaint(v);
double vv0 = this.axis.valueToJava2D(v, target,
RectangleEdge.LEFT);
double vv1 = this.axis.valueToJava2D(v + increment, target,
RectangleEdge.LEFT);
double hh = Math.abs(vv1 - vv0) + 1.0;
r.setRect(target.getMinX(), Math.min(vv0, vv1),
this.stripWidth, hh);
g2.setPaint(p);
g2.fill(r);
}
if (isStripOutlineVisible()) {
g2.setPaint(this.stripOutlinePaint);
g2.setStroke(this.stripOutlineStroke);
g2.draw(new Rectangle2D.Double(target.getMinX(),
target.getMinY(), this.stripWidth,
target.getHeight()));
}
this.axis.draw(g2, target.getMinX() + this.stripWidth
+ this.axisOffset, target, target, RectangleEdge.RIGHT,
null);
}
}
return null;
}
/**
* Tests this legend for equality with an arbitrary object.
*
* @param obj the object (<code>null permitted).
*
* @return A boolean.
*/
public boolean equals(Object obj) {
if (!(obj instanceof PaintScaleLegend)) {
return false;
}
PaintScaleLegend that = (PaintScaleLegend) obj;
if (!this.scale.equals(that.scale)) {
return false;
}
if (!this.axis.equals(that.axis)) {
return false;
}
if (!this.axisLocation.equals(that.axisLocation)) {
return false;
}
if (this.axisOffset != that.axisOffset) {
return false;
}
if (this.stripWidth != that.stripWidth) {
return false;
}
if (this.stripOutlineVisible != that.stripOutlineVisible) {
return false;
}
if (!PaintUtilities.equal(this.stripOutlinePaint,
that.stripOutlinePaint)) {
return false;
}
if (!this.stripOutlineStroke.equals(that.stripOutlineStroke)) {
return false;
}
if (!PaintUtilities.equal(this.backgroundPaint, that.backgroundPaint)) {
return false;
}
if (this.subdivisions != that.subdivisions) {
return false;
}
return super.equals(obj);
}
/**
* 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();
SerialUtilities.writePaint(this.backgroundPaint, stream);
SerialUtilities.writePaint(this.stripOutlinePaint, stream);
SerialUtilities.writeStroke(this.stripOutlineStroke, 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.backgroundPaint = SerialUtilities.readPaint(stream);
this.stripOutlinePaint = SerialUtilities.readPaint(stream);
this.stripOutlineStroke = SerialUtilities.readStroke(stream);
}
}
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