jfreechart example source code file (MeterPlot.java)
The jfreechart MeterPlot.java source code
/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2008, 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.]
*
* --------------
* MeterPlot.java
* --------------
* (C) Copyright 2000-2008, by Hari and Contributors.
*
* Original Author: Hari (ourhari@hotmail.com);
* Contributor(s): David Gilbert (for Object Refinery Limited);
* Bob Orchard;
* Arnaud Lelievre;
* Nicolas Brodu;
* David Bastend;
*
* Changes
* -------
* 01-Apr-2002 : Version 1, contributed by Hari (DG);
* 23-Apr-2002 : Moved dataset from JFreeChart to Plot (DG);
* 22-Aug-2002 : Added changes suggest by Bob Orchard, changed Color to Paint
* for consistency, plus added Javadoc comments (DG);
* 01-Oct-2002 : Fixed errors reported by Checkstyle (DG);
* 23-Jan-2003 : Removed one constructor (DG);
* 26-Mar-2003 : Implemented Serializable (DG);
* 20-Aug-2003 : Changed dataset from MeterDataset --> ValueDataset, added
* equals() method,
* 08-Sep-2003 : Added internationalization via use of properties
* resourceBundle (RFE 690236) (AL);
* implemented Cloneable, and various other changes (DG);
* 08-Sep-2003 : Added serialization methods (NB);
* 11-Sep-2003 : Added cloning support (NB);
* 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
* 25-Sep-2003 : Fix useless cloning. Correct dataset listener registration in
* constructor. (NB)
* 29-Oct-2003 : Added workaround for font alignment in PDF output (DG);
* 17-Jan-2004 : Changed to allow dialBackgroundPaint to be set to null - see
* bug 823628 (DG);
* 07-Apr-2004 : Changed string bounds calculation (DG);
* 12-May-2004 : Added tickLabelFormat attribute - see RFE 949566. Also
* updated the equals() method (DG);
* 02-Nov-2004 : Added sanity checks for range, and only draw the needle if the
* value is contained within the overall range - see bug report
* 1056047 (DG);
* 11-Jan-2005 : Removed deprecated code in preparation for the 1.0.0
* release (DG);
* 02-Feb-2005 : Added optional background paint for each region (DG);
* 22-Mar-2005 : Removed 'normal', 'warning' and 'critical' regions and put in
* facility to define an arbitrary number of MeterIntervals,
* based on a contribution by David Bastend (DG);
* 20-Apr-2005 : Small update for change to LegendItem constructors (DG);
* 05-May-2005 : Updated draw() method parameters (DG);
* 08-Jun-2005 : Fixed equals() method to handle GradientPaint (DG);
* 10-Nov-2005 : Added tickPaint, tickSize and valuePaint attributes, and
* put value label drawing code into a separate method (DG);
* ------------- JFREECHART 1.0.x ---------------------------------------------
* 05-Mar-2007 : Restore clip region correctly (see bug 1667750) (DG);
* 18-May-2007 : Set dataset for LegendItem (DG);
* 29-Nov-2007 : Fixed serialization bug with dialOutlinePaint (DG);
* 18-Dec-2008 : Use ResourceBundleWrapper - see patch 1607918 by
* Jess Thrysoee (DG);
*
*/
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.FontMetrics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Polygon;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Arc2D;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
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.text.NumberFormat;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.ResourceBundle;
import org.jfree.chart.LegendItem;
import org.jfree.chart.LegendItemCollection;
import org.jfree.chart.event.PlotChangeEvent;
import org.jfree.chart.util.ResourceBundleWrapper;
import org.jfree.data.Range;
import org.jfree.data.general.DatasetChangeEvent;
import org.jfree.data.general.ValueDataset;
import org.jfree.io.SerialUtilities;
import org.jfree.text.TextUtilities;
import org.jfree.ui.RectangleInsets;
import org.jfree.ui.TextAnchor;
import org.jfree.util.ObjectUtilities;
import org.jfree.util.PaintUtilities;
/**
* A plot that displays a single value in the form of a needle on a dial.
* Defined ranges (for example, 'normal', 'warning' and 'critical') can be
* highlighted on the dial.
*/
public class MeterPlot extends Plot implements Serializable, Cloneable {
/** For serialization. */
private static final long serialVersionUID = 2987472457734470962L;
/** The default background paint. */
static final Paint DEFAULT_DIAL_BACKGROUND_PAINT = Color.black;
/** The default needle paint. */
static final Paint DEFAULT_NEEDLE_PAINT = Color.green;
/** The default value font. */
static final Font DEFAULT_VALUE_FONT = new Font("SansSerif", Font.BOLD, 12);
/** The default value paint. */
static final Paint DEFAULT_VALUE_PAINT = Color.yellow;
/** The default meter angle. */
public static final int DEFAULT_METER_ANGLE = 270;
/** The default border size. */
public static final float DEFAULT_BORDER_SIZE = 3f;
/** The default circle size. */
public static final float DEFAULT_CIRCLE_SIZE = 10f;
/** The default label font. */
public static final Font DEFAULT_LABEL_FONT = new Font("SansSerif",
Font.BOLD, 10);
/** The dataset (contains a single value). */
private ValueDataset dataset;
/** The dial shape (background shape). */
private DialShape shape;
/** The dial extent (measured in degrees). */
private int meterAngle;
/** The overall range of data values on the dial. */
private Range range;
/** The tick size. */
private double tickSize;
/** The paint used to draw the ticks. */
private transient Paint tickPaint;
/** The units displayed on the dial. */
private String units;
/** The font for the value displayed in the center of the dial. */
private Font valueFont;
/** The paint for the value displayed in the center of the dial. */
private transient Paint valuePaint;
/** A flag that controls whether or not the border is drawn. */
private boolean drawBorder;
/** The outline paint. */
private transient Paint dialOutlinePaint;
/** The paint for the dial background. */
private transient Paint dialBackgroundPaint;
/** The paint for the needle. */
private transient Paint needlePaint;
/** A flag that controls whether or not the tick labels are visible. */
private boolean tickLabelsVisible;
/** The tick label font. */
private Font tickLabelFont;
/** The tick label paint. */
private transient Paint tickLabelPaint;
/** The tick label format. */
private NumberFormat tickLabelFormat;
/** The resourceBundle for the localization. */
protected static ResourceBundle localizationResources
= ResourceBundleWrapper.getBundle(
"org.jfree.chart.plot.LocalizationBundle");
/**
* A (possibly empty) list of the {@link MeterInterval}s to be highlighted
* on the dial.
*/
private List intervals;
/**
* Creates a new plot with a default range of <code>0 to
* <code>100 and no value to display.
*/
public MeterPlot() {
this(null);
}
/**
* Creates a new plot that displays the value from the supplied dataset.
*
* @param dataset the dataset (<code>null permitted).
*/
public MeterPlot(ValueDataset dataset) {
super();
this.shape = DialShape.CIRCLE;
this.meterAngle = DEFAULT_METER_ANGLE;
this.range = new Range(0.0, 100.0);
this.tickSize = 10.0;
this.tickPaint = Color.white;
this.units = "Units";
this.needlePaint = MeterPlot.DEFAULT_NEEDLE_PAINT;
this.tickLabelsVisible = true;
this.tickLabelFont = MeterPlot.DEFAULT_LABEL_FONT;
this.tickLabelPaint = Color.black;
this.tickLabelFormat = NumberFormat.getInstance();
this.valueFont = MeterPlot.DEFAULT_VALUE_FONT;
this.valuePaint = MeterPlot.DEFAULT_VALUE_PAINT;
this.dialBackgroundPaint = MeterPlot.DEFAULT_DIAL_BACKGROUND_PAINT;
this.intervals = new java.util.ArrayList();
setDataset(dataset);
}
/**
* Returns the dial shape. The default is {@link DialShape#CIRCLE}).
*
* @return The dial shape (never <code>null).
*
* @see #setDialShape(DialShape)
*/
public DialShape getDialShape() {
return this.shape;
}
/**
* Sets the dial shape and sends a {@link PlotChangeEvent} to all
* registered listeners.
*
* @param shape the shape (<code>null not permitted).
*
* @see #getDialShape()
*/
public void setDialShape(DialShape shape) {
if (shape == null) {
throw new IllegalArgumentException("Null 'shape' argument.");
}
this.shape = shape;
fireChangeEvent();
}
/**
* Returns the meter angle in degrees. This defines, in part, the shape
* of the dial. The default is 270 degrees.
*
* @return The meter angle (in degrees).
*
* @see #setMeterAngle(int)
*/
public int getMeterAngle() {
return this.meterAngle;
}
/**
* Sets the angle (in degrees) for the whole range of the dial and sends
* a {@link PlotChangeEvent} to all registered listeners.
*
* @param angle the angle (in degrees, in the range 1-360).
*
* @see #getMeterAngle()
*/
public void setMeterAngle(int angle) {
if (angle < 1 || angle > 360) {
throw new IllegalArgumentException("Invalid 'angle' (" + angle
+ ")");
}
this.meterAngle = angle;
fireChangeEvent();
}
/**
* Returns the overall range for the dial.
*
* @return The overall range (never <code>null).
*
* @see #setRange(Range)
*/
public Range getRange() {
return this.range;
}
/**
* Sets the range for the dial and sends a {@link PlotChangeEvent} to all
* registered listeners.
*
* @param range the range (<code>null not permitted and zero-length
* ranges not permitted).
*
* @see #getRange()
*/
public void setRange(Range range) {
if (range == null) {
throw new IllegalArgumentException("Null 'range' argument.");
}
if (!(range.getLength() > 0.0)) {
throw new IllegalArgumentException(
"Range length must be positive.");
}
this.range = range;
fireChangeEvent();
}
/**
* Returns the tick size (the interval between ticks on the dial).
*
* @return The tick size.
*
* @see #setTickSize(double)
*/
public double getTickSize() {
return this.tickSize;
}
/**
* Sets the tick size and sends a {@link PlotChangeEvent} to all
* registered listeners.
*
* @param size the tick size (must be > 0).
*
* @see #getTickSize()
*/
public void setTickSize(double size) {
if (size <= 0) {
throw new IllegalArgumentException("Requires 'size' > 0.");
}
this.tickSize = size;
fireChangeEvent();
}
/**
* Returns the paint used to draw the ticks around the dial.
*
* @return The paint used to draw the ticks around the dial (never
* <code>null).
*
* @see #setTickPaint(Paint)
*/
public Paint getTickPaint() {
return this.tickPaint;
}
/**
* Sets the paint used to draw the tick labels around the dial and sends
* a {@link PlotChangeEvent} to all registered listeners.
*
* @param paint the paint (<code>null not permitted).
*
* @see #getTickPaint()
*/
public void setTickPaint(Paint paint) {
if (paint == null) {
throw new IllegalArgumentException("Null 'paint' argument.");
}
this.tickPaint = paint;
fireChangeEvent();
}
/**
* Returns a string describing the units for the dial.
*
* @return The units (possibly <code>null).
*
* @see #setUnits(String)
*/
public String getUnits() {
return this.units;
}
/**
* Sets the units for the dial and sends a {@link PlotChangeEvent} to all
* registered listeners.
*
* @param units the units (<code>null permitted).
*
* @see #getUnits()
*/
public void setUnits(String units) {
this.units = units;
fireChangeEvent();
}
/**
* Returns the paint for the needle.
*
* @return The paint (never <code>null).
*
* @see #setNeedlePaint(Paint)
*/
public Paint getNeedlePaint() {
return this.needlePaint;
}
/**
* Sets the paint used to display the needle and sends a
* {@link PlotChangeEvent} to all registered listeners.
*
* @param paint the paint (<code>null not permitted).
*
* @see #getNeedlePaint()
*/
public void setNeedlePaint(Paint paint) {
if (paint == null) {
throw new IllegalArgumentException("Null 'paint' argument.");
}
this.needlePaint = paint;
fireChangeEvent();
}
/**
* Returns the flag that determines whether or not tick labels are visible.
*
* @return The flag.
*
* @see #setTickLabelsVisible(boolean)
*/
public boolean getTickLabelsVisible() {
return this.tickLabelsVisible;
}
/**
* Sets the flag that controls whether or not the tick labels are visible
* and sends a {@link PlotChangeEvent} to all registered listeners.
*
* @param visible the flag.
*
* @see #getTickLabelsVisible()
*/
public void setTickLabelsVisible(boolean visible) {
if (this.tickLabelsVisible != visible) {
this.tickLabelsVisible = visible;
fireChangeEvent();
}
}
/**
* Returns the tick label font.
*
* @return The font (never <code>null).
*
* @see #setTickLabelFont(Font)
*/
public Font getTickLabelFont() {
return this.tickLabelFont;
}
/**
* Sets the tick label font and sends a {@link PlotChangeEvent} to all
* registered listeners.
*
* @param font the font (<code>null not permitted).
*
* @see #getTickLabelFont()
*/
public void setTickLabelFont(Font font) {
if (font == null) {
throw new IllegalArgumentException("Null 'font' argument.");
}
if (!this.tickLabelFont.equals(font)) {
this.tickLabelFont = font;
fireChangeEvent();
}
}
/**
* Returns the tick label paint.
*
* @return The paint (never <code>null).
*
* @see #setTickLabelPaint(Paint)
*/
public Paint getTickLabelPaint() {
return this.tickLabelPaint;
}
/**
* Sets the tick label paint and sends a {@link PlotChangeEvent} to all
* registered listeners.
*
* @param paint the paint (<code>null not permitted).
*
* @see #getTickLabelPaint()
*/
public void setTickLabelPaint(Paint paint) {
if (paint == null) {
throw new IllegalArgumentException("Null 'paint' argument.");
}
if (!this.tickLabelPaint.equals(paint)) {
this.tickLabelPaint = paint;
fireChangeEvent();
}
}
/**
* Returns the tick label format.
*
* @return The tick label format (never <code>null).
*
* @see #setTickLabelFormat(NumberFormat)
*/
public NumberFormat getTickLabelFormat() {
return this.tickLabelFormat;
}
/**
* Sets the format for the tick labels and sends a {@link PlotChangeEvent}
* to all registered listeners.
*
* @param format the format (<code>null not permitted).
*
* @see #getTickLabelFormat()
*/
public void setTickLabelFormat(NumberFormat format) {
if (format == null) {
throw new IllegalArgumentException("Null 'format' argument.");
}
this.tickLabelFormat = format;
fireChangeEvent();
}
/**
* Returns the font for the value label.
*
* @return The font (never <code>null).
*
* @see #setValueFont(Font)
*/
public Font getValueFont() {
return this.valueFont;
}
/**
* Sets the font used to display the value label and sends a
* {@link PlotChangeEvent} to all registered listeners.
*
* @param font the font (<code>null not permitted).
*
* @see #getValueFont()
*/
public void setValueFont(Font font) {
if (font == null) {
throw new IllegalArgumentException("Null 'font' argument.");
}
this.valueFont = font;
fireChangeEvent();
}
/**
* Returns the paint for the value label.
*
* @return The paint (never <code>null).
*
* @see #setValuePaint(Paint)
*/
public Paint getValuePaint() {
return this.valuePaint;
}
/**
* Sets the paint used to display the value label and sends a
* {@link PlotChangeEvent} to all registered listeners.
*
* @param paint the paint (<code>null not permitted).
*
* @see #getValuePaint()
*/
public void setValuePaint(Paint paint) {
if (paint == null) {
throw new IllegalArgumentException("Null 'paint' argument.");
}
this.valuePaint = paint;
fireChangeEvent();
}
/**
* Returns the paint for the dial background.
*
* @return The paint (possibly <code>null).
*
* @see #setDialBackgroundPaint(Paint)
*/
public Paint getDialBackgroundPaint() {
return this.dialBackgroundPaint;
}
/**
* Sets the paint used to fill the dial background. Set this to
* <code>null for no background.
*
* @param paint the paint (<code>null permitted).
*
* @see #getDialBackgroundPaint()
*/
public void setDialBackgroundPaint(Paint paint) {
this.dialBackgroundPaint = paint;
fireChangeEvent();
}
/**
* Returns a flag that controls whether or not a rectangular border is
* drawn around the plot area.
*
* @return A flag.
*
* @see #setDrawBorder(boolean)
*/
public boolean getDrawBorder() {
return this.drawBorder;
}
/**
* Sets the flag that controls whether or not a rectangular border is drawn
* around the plot area and sends a {@link PlotChangeEvent} to all
* registered listeners.
*
* @param draw the flag.
*
* @see #getDrawBorder()
*/
public void setDrawBorder(boolean draw) {
// TODO: fix output when this flag is set to true
this.drawBorder = draw;
fireChangeEvent();
}
/**
* Returns the dial outline paint.
*
* @return The paint.
*
* @see #setDialOutlinePaint(Paint)
*/
public Paint getDialOutlinePaint() {
return this.dialOutlinePaint;
}
/**
* Sets the dial outline paint and sends a {@link PlotChangeEvent} to all
* registered listeners.
*
* @param paint the paint.
*
* @see #getDialOutlinePaint()
*/
public void setDialOutlinePaint(Paint paint) {
this.dialOutlinePaint = paint;
fireChangeEvent();
}
/**
* Returns the dataset for the plot.
*
* @return The dataset (possibly <code>null).
*
* @see #setDataset(ValueDataset)
*/
public ValueDataset getDataset() {
return this.dataset;
}
/**
* Sets the dataset for the plot, replacing the existing dataset if there
* is one, and triggers a {@link PlotChangeEvent}.
*
* @param dataset the dataset (<code>null permitted).
*
* @see #getDataset()
*/
public void setDataset(ValueDataset dataset) {
// if there is an existing dataset, remove the plot from the list of
// change listeners...
ValueDataset existing = this.dataset;
if (existing != null) {
existing.removeChangeListener(this);
}
// set the new dataset, and register the chart as a change listener...
this.dataset = dataset;
if (dataset != null) {
setDatasetGroup(dataset.getGroup());
dataset.addChangeListener(this);
}
// send a dataset change event to self...
DatasetChangeEvent event = new DatasetChangeEvent(this, dataset);
datasetChanged(event);
}
/**
* Returns an unmodifiable list of the intervals for the plot.
*
* @return A list.
*
* @see #addInterval(MeterInterval)
*/
public List getIntervals() {
return Collections.unmodifiableList(this.intervals);
}
/**
* Adds an interval and sends a {@link PlotChangeEvent} to all registered
* listeners.
*
* @param interval the interval (<code>null not permitted).
*
* @see #getIntervals()
* @see #clearIntervals()
*/
public void addInterval(MeterInterval interval) {
if (interval == null) {
throw new IllegalArgumentException("Null 'interval' argument.");
}
this.intervals.add(interval);
fireChangeEvent();
}
/**
* Clears the intervals for the plot and sends a {@link PlotChangeEvent} to
* all registered listeners.
*
* @see #addInterval(MeterInterval)
*/
public void clearIntervals() {
this.intervals.clear();
fireChangeEvent();
}
/**
* Returns an item for each interval.
*
* @return A collection of legend items.
*/
public LegendItemCollection getLegendItems() {
LegendItemCollection result = new LegendItemCollection();
Iterator iterator = this.intervals.iterator();
while (iterator.hasNext()) {
MeterInterval mi = (MeterInterval) iterator.next();
Paint color = mi.getBackgroundPaint();
if (color == null) {
color = mi.getOutlinePaint();
}
LegendItem item = new LegendItem(mi.getLabel(), mi.getLabel(),
null, null, new Rectangle2D.Double(-4.0, -4.0, 8.0, 8.0),
color);
item.setDataset(getDataset());
result.add(item);
}
return result;
}
/**
* Draws the plot on a Java 2D graphics device (such as the screen or a
* printer).
*
* @param g2 the graphics device.
* @param area the area within which the plot should be drawn.
* @param anchor the anchor point (<code>null permitted).
* @param parentState the state from the parent plot, if there is one.
* @param info collects info about the drawing.
*/
public void draw(Graphics2D g2, Rectangle2D area, Point2D anchor,
PlotState parentState,
PlotRenderingInfo info) {
if (info != null) {
info.setPlotArea(area);
}
// adjust for insets...
RectangleInsets insets = getInsets();
insets.trim(area);
area.setRect(area.getX() + 4, area.getY() + 4, area.getWidth() - 8,
area.getHeight() - 8);
// draw the background
if (this.drawBorder) {
drawBackground(g2, area);
}
// adjust the plot area by the interior spacing value
double gapHorizontal = (2 * DEFAULT_BORDER_SIZE);
double gapVertical = (2 * DEFAULT_BORDER_SIZE);
double meterX = area.getX() + gapHorizontal / 2;
double meterY = area.getY() + gapVertical / 2;
double meterW = area.getWidth() - gapHorizontal;
double meterH = area.getHeight() - gapVertical
+ ((this.meterAngle <= 180) && (this.shape != DialShape.CIRCLE)
? area.getHeight() / 1.25 : 0);
double min = Math.min(meterW, meterH) / 2;
meterX = (meterX + meterX + meterW) / 2 - min;
meterY = (meterY + meterY + meterH) / 2 - min;
meterW = 2 * min;
meterH = 2 * min;
Rectangle2D meterArea = new Rectangle2D.Double(meterX, meterY, meterW,
meterH);
Rectangle2D.Double originalArea = new Rectangle2D.Double(
meterArea.getX() - 4, meterArea.getY() - 4,
meterArea.getWidth() + 8, meterArea.getHeight() + 8);
double meterMiddleX = meterArea.getCenterX();
double meterMiddleY = meterArea.getCenterY();
// plot the data (unless the dataset is null)...
ValueDataset data = getDataset();
if (data != null) {
double dataMin = this.range.getLowerBound();
double dataMax = this.range.getUpperBound();
Shape savedClip = g2.getClip();
g2.clip(originalArea);
Composite originalComposite = g2.getComposite();
g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,
getForegroundAlpha()));
if (this.dialBackgroundPaint != null) {
fillArc(g2, originalArea, dataMin, dataMax,
this.dialBackgroundPaint, true);
}
drawTicks(g2, meterArea, dataMin, dataMax);
drawArcForInterval(g2, meterArea, new MeterInterval("", this.range,
this.dialOutlinePaint, new BasicStroke(1.0f), null));
Iterator iterator = this.intervals.iterator();
while (iterator.hasNext()) {
MeterInterval interval = (MeterInterval) iterator.next();
drawArcForInterval(g2, meterArea, interval);
}
Number n = data.getValue();
if (n != null) {
double value = n.doubleValue();
drawValueLabel(g2, meterArea);
if (this.range.contains(value)) {
g2.setPaint(this.needlePaint);
g2.setStroke(new BasicStroke(2.0f));
double radius = (meterArea.getWidth() / 2)
+ DEFAULT_BORDER_SIZE + 15;
double valueAngle = valueToAngle(value);
double valueP1 = meterMiddleX
+ (radius * Math.cos(Math.PI * (valueAngle / 180)));
double valueP2 = meterMiddleY
- (radius * Math.sin(Math.PI * (valueAngle / 180)));
Polygon arrow = new Polygon();
if ((valueAngle > 135 && valueAngle < 225)
|| (valueAngle < 45 && valueAngle > -45)) {
double valueP3 = (meterMiddleY
- DEFAULT_CIRCLE_SIZE / 4);
double valueP4 = (meterMiddleY
+ DEFAULT_CIRCLE_SIZE / 4);
arrow.addPoint((int) meterMiddleX, (int) valueP3);
arrow.addPoint((int) meterMiddleX, (int) valueP4);
}
else {
arrow.addPoint((int) (meterMiddleX
- DEFAULT_CIRCLE_SIZE / 4), (int) meterMiddleY);
arrow.addPoint((int) (meterMiddleX
+ DEFAULT_CIRCLE_SIZE / 4), (int) meterMiddleY);
}
arrow.addPoint((int) valueP1, (int) valueP2);
g2.fill(arrow);
Ellipse2D circle = new Ellipse2D.Double(meterMiddleX
- DEFAULT_CIRCLE_SIZE / 2, meterMiddleY
- DEFAULT_CIRCLE_SIZE / 2, DEFAULT_CIRCLE_SIZE,
DEFAULT_CIRCLE_SIZE);
g2.fill(circle);
}
}
g2.setClip(savedClip);
g2.setComposite(originalComposite);
}
if (this.drawBorder) {
drawOutline(g2, area);
}
}
/**
* Draws the arc to represent an interval.
*
* @param g2 the graphics device.
* @param meterArea the drawing area.
* @param interval the interval.
*/
protected void drawArcForInterval(Graphics2D g2, Rectangle2D meterArea,
MeterInterval interval) {
double minValue = interval.getRange().getLowerBound();
double maxValue = interval.getRange().getUpperBound();
Paint outlinePaint = interval.getOutlinePaint();
Stroke outlineStroke = interval.getOutlineStroke();
Paint backgroundPaint = interval.getBackgroundPaint();
if (backgroundPaint != null) {
fillArc(g2, meterArea, minValue, maxValue, backgroundPaint, false);
}
if (outlinePaint != null) {
if (outlineStroke != null) {
drawArc(g2, meterArea, minValue, maxValue, outlinePaint,
outlineStroke);
}
drawTick(g2, meterArea, minValue, true);
drawTick(g2, meterArea, maxValue, true);
}
}
/**
* Draws an arc.
*
* @param g2 the graphics device.
* @param area the plot area.
* @param minValue the minimum value.
* @param maxValue the maximum value.
* @param paint the paint.
* @param stroke the stroke.
*/
protected void drawArc(Graphics2D g2, Rectangle2D area, double minValue,
double maxValue, Paint paint, Stroke stroke) {
double startAngle = valueToAngle(maxValue);
double endAngle = valueToAngle(minValue);
double extent = endAngle - startAngle;
double x = area.getX();
double y = area.getY();
double w = area.getWidth();
double h = area.getHeight();
g2.setPaint(paint);
g2.setStroke(stroke);
if (paint != null && stroke != null) {
Arc2D.Double arc = new Arc2D.Double(x, y, w, h, startAngle,
extent, Arc2D.OPEN);
g2.setPaint(paint);
g2.setStroke(stroke);
g2.draw(arc);
}
}
/**
* Fills an arc on the dial between the given values.
*
* @param g2 the graphics device.
* @param area the plot area.
* @param minValue the minimum data value.
* @param maxValue the maximum data value.
* @param paint the background paint (<code>null not permitted).
* @param dial a flag that indicates whether the arc represents the whole
* dial.
*/
protected void fillArc(Graphics2D g2, Rectangle2D area,
double minValue, double maxValue, Paint paint,
boolean dial) {
if (paint == null) {
throw new IllegalArgumentException("Null 'paint' argument");
}
double startAngle = valueToAngle(maxValue);
double endAngle = valueToAngle(minValue);
double extent = endAngle - startAngle;
double x = area.getX();
double y = area.getY();
double w = area.getWidth();
double h = area.getHeight();
int joinType = Arc2D.OPEN;
if (this.shape == DialShape.PIE) {
joinType = Arc2D.PIE;
}
else if (this.shape == DialShape.CHORD) {
if (dial && this.meterAngle > 180) {
joinType = Arc2D.CHORD;
}
else {
joinType = Arc2D.PIE;
}
}
else if (this.shape == DialShape.CIRCLE) {
joinType = Arc2D.PIE;
if (dial) {
extent = 360;
}
}
else {
throw new IllegalStateException("DialShape not recognised.");
}
g2.setPaint(paint);
Arc2D.Double arc = new Arc2D.Double(x, y, w, h, startAngle, extent,
joinType);
g2.fill(arc);
}
/**
* Translates a data value to an angle on the dial.
*
* @param value the value.
*
* @return The angle on the dial.
*/
public double valueToAngle(double value) {
value = value - this.range.getLowerBound();
double baseAngle = 180 + ((this.meterAngle - 180) / 2);
return baseAngle - ((value / this.range.getLength()) * this.meterAngle);
}
/**
* Draws the ticks that subdivide the overall range.
*
* @param g2 the graphics device.
* @param meterArea the meter area.
* @param minValue the minimum value.
* @param maxValue the maximum value.
*/
protected void drawTicks(Graphics2D g2, Rectangle2D meterArea,
double minValue, double maxValue) {
for (double v = minValue; v <= maxValue; v += this.tickSize) {
drawTick(g2, meterArea, v);
}
}
/**
* Draws a tick.
*
* @param g2 the graphics device.
* @param meterArea the meter area.
* @param value the value.
*/
protected void drawTick(Graphics2D g2, Rectangle2D meterArea,
double value) {
drawTick(g2, meterArea, value, false);
}
/**
* Draws a tick on the dial.
*
* @param g2 the graphics device.
* @param meterArea the meter area.
* @param value the tick value.
* @param label a flag that controls whether or not a value label is drawn.
*/
protected void drawTick(Graphics2D g2, Rectangle2D meterArea,
double value, boolean label) {
double valueAngle = valueToAngle(value);
double meterMiddleX = meterArea.getCenterX();
double meterMiddleY = meterArea.getCenterY();
g2.setPaint(this.tickPaint);
g2.setStroke(new BasicStroke(2.0f));
double valueP2X = 0;
double valueP2Y = 0;
double radius = (meterArea.getWidth() / 2) + DEFAULT_BORDER_SIZE;
double radius1 = radius - 15;
double valueP1X = meterMiddleX
+ (radius * Math.cos(Math.PI * (valueAngle / 180)));
double valueP1Y = meterMiddleY
- (radius * Math.sin(Math.PI * (valueAngle / 180)));
valueP2X = meterMiddleX
+ (radius1 * Math.cos(Math.PI * (valueAngle / 180)));
valueP2Y = meterMiddleY
- (radius1 * Math.sin(Math.PI * (valueAngle / 180)));
Line2D.Double line = new Line2D.Double(valueP1X, valueP1Y, valueP2X,
valueP2Y);
g2.draw(line);
if (this.tickLabelsVisible && label) {
String tickLabel = this.tickLabelFormat.format(value);
g2.setFont(this.tickLabelFont);
g2.setPaint(this.tickLabelPaint);
FontMetrics fm = g2.getFontMetrics();
Rectangle2D tickLabelBounds
= TextUtilities.getTextBounds(tickLabel, g2, fm);
double x = valueP2X;
double y = valueP2Y;
if (valueAngle == 90 || valueAngle == 270) {
x = x - tickLabelBounds.getWidth() / 2;
}
else if (valueAngle < 90 || valueAngle > 270) {
x = x - tickLabelBounds.getWidth();
}
if ((valueAngle > 135 && valueAngle < 225)
|| valueAngle > 315 || valueAngle < 45) {
y = y - tickLabelBounds.getHeight() / 2;
}
else {
y = y + tickLabelBounds.getHeight() / 2;
}
g2.drawString(tickLabel, (float) x, (float) y);
}
}
/**
* Draws the value label just below the center of the dial.
*
* @param g2 the graphics device.
* @param area the plot area.
*/
protected void drawValueLabel(Graphics2D g2, Rectangle2D area) {
g2.setFont(this.valueFont);
g2.setPaint(this.valuePaint);
String valueStr = "No value";
if (this.dataset != null) {
Number n = this.dataset.getValue();
if (n != null) {
valueStr = this.tickLabelFormat.format(n.doubleValue()) + " "
+ this.units;
}
}
float x = (float) area.getCenterX();
float y = (float) area.getCenterY() + DEFAULT_CIRCLE_SIZE;
TextUtilities.drawAlignedString(valueStr, g2, x, y,
TextAnchor.TOP_CENTER);
}
/**
* Returns a short string describing the type of plot.
*
* @return A string describing the type of plot.
*/
public String getPlotType() {
return localizationResources.getString("Meter_Plot");
}
/**
* A zoom method that does nothing. Plots are required to support the
* zoom operation. In the case of a meter plot, it doesn't make sense to
* zoom in or out, so the method is empty.
*
* @param percent The zoom percentage.
*/
public void zoom(double percent) {
// intentionally blank
}
/**
* Tests the plot for equality with an arbitrary object. Note that the
* dataset is ignored for the purposes of testing equality.
*
* @param obj the object (<code>null permitted).
*
* @return A boolean.
*/
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof MeterPlot)) {
return false;
}
if (!super.equals(obj)) {
return false;
}
MeterPlot that = (MeterPlot) obj;
if (!ObjectUtilities.equal(this.units, that.units)) {
return false;
}
if (!ObjectUtilities.equal(this.range, that.range)) {
return false;
}
if (!ObjectUtilities.equal(this.intervals, that.intervals)) {
return false;
}
if (!PaintUtilities.equal(this.dialOutlinePaint,
that.dialOutlinePaint)) {
return false;
}
if (this.shape != that.shape) {
return false;
}
if (!PaintUtilities.equal(this.dialBackgroundPaint,
that.dialBackgroundPaint)) {
return false;
}
if (!PaintUtilities.equal(this.needlePaint, that.needlePaint)) {
return false;
}
if (!ObjectUtilities.equal(this.valueFont, that.valueFont)) {
return false;
}
if (!PaintUtilities.equal(this.valuePaint, that.valuePaint)) {
return false;
}
if (!PaintUtilities.equal(this.tickPaint, that.tickPaint)) {
return false;
}
if (this.tickSize != that.tickSize) {
return false;
}
if (this.tickLabelsVisible != that.tickLabelsVisible) {
return false;
}
if (!ObjectUtilities.equal(this.tickLabelFont, that.tickLabelFont)) {
return false;
}
if (!PaintUtilities.equal(this.tickLabelPaint, that.tickLabelPaint)) {
return false;
}
if (!ObjectUtilities.equal(this.tickLabelFormat,
that.tickLabelFormat)) {
return false;
}
if (this.drawBorder != that.drawBorder) {
return false;
}
if (this.meterAngle != that.meterAngle) {
return false;
}
return true;
}
/**
* 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.dialBackgroundPaint, stream);
SerialUtilities.writePaint(this.dialOutlinePaint, stream);
SerialUtilities.writePaint(this.needlePaint, stream);
SerialUtilities.writePaint(this.valuePaint, stream);
SerialUtilities.writePaint(this.tickPaint, stream);
SerialUtilities.writePaint(this.tickLabelPaint, 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.dialBackgroundPaint = SerialUtilities.readPaint(stream);
this.dialOutlinePaint = SerialUtilities.readPaint(stream);
this.needlePaint = SerialUtilities.readPaint(stream);
this.valuePaint = SerialUtilities.readPaint(stream);
this.tickPaint = SerialUtilities.readPaint(stream);
this.tickLabelPaint = SerialUtilities.readPaint(stream);
if (this.dataset != null) {
this.dataset.addChangeListener(this);
}
}
/**
* Returns an independent copy (clone) of the plot. The dataset is NOT
* cloned - both the original and the clone will have a reference to the
* same dataset.
*
* @return A clone.
*
* @throws CloneNotSupportedException if some component of the plot cannot
* be cloned.
*/
public Object clone() throws CloneNotSupportedException {
MeterPlot clone = (MeterPlot) super.clone();
clone.tickLabelFormat = (NumberFormat) this.tickLabelFormat.clone();
// the following relies on the fact that the intervals are immutable
clone.intervals = new java.util.ArrayList(this.intervals);
if (clone.dataset != null) {
clone.dataset.addChangeListener(clone);
}
return clone;
}
}
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