/* ===========================================================
* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2011, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
* Other names may be trademarks of their respective owners.]
*
* ---------------------------
* ClusteredXYBarRenderer.java
* ---------------------------
* (C) Copyright 2003-2008, by Paolo Cova and Contributors.
*
* Original Author: Paolo Cova;
* Contributor(s): David Gilbert (for Object Refinery Limited);
* Christian W. Zuckschwerdt;
* Matthias Rose;
*
* Changes
* -------
* 24-Jan-2003 : Version 1, contributed by Paolo Cova (DG);
* 25-Mar-2003 : Implemented Serializable (DG);
* 01-May-2003 : Modified drawItem() method signature (DG);
* 30-Jul-2003 : Modified entity constructor (CZ);
* 20-Aug-2003 : Implemented Cloneable and PublicCloneable (DG);
* 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
* 07-Oct-2003 : Added renderer state (DG);
* 03-Nov-2003 : In draw method added state parameter and y==null value
* handling (MR);
* 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState (DG);
* 15-Jul-2004 : Switched getX() with getXValue() and getY() with
* getYValue() (DG);
* 01-Oct-2004 : Fixed bug where 'drawBarOutline' flag is ignored (DG);
* 16-May-2005 : Fixed to used outline stroke for bar outlines. Removed some
* redundant code with the result that the renderer now respects
* the 'base' setting from the super-class. Added an equals()
* method (DG);
* 19-May-2005 : Added minimal item label implementation - needs improving (DG);
* ------------- JFREECHART 1.0.x ---------------------------------------------
* 11-Dec-2006 : Added support for GradientPaint (DG);
* 12-Jun-2007 : Added override to findDomainBounds() to handle cluster offset,
* fixed rendering to handle inverted axes, and simplified
* entity generation code (DG);
* 24-Jun-2008 : Added new barPainter mechanism (DG);
*
*/
package org.jfree.chart.renderer.xy;
import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import java.io.Serializable;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.labels.XYItemLabelGenerator;
import org.jfree.chart.plot.CrosshairState;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.Range;
import org.jfree.data.xy.IntervalXYDataset;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.PublicCloneable;
/**
* An extension of {@link XYBarRenderer} that displays bars for different
* series values at the same x next to each other. The assumption here is
* that for each x (time or else) there is a y value for each series. If
* this is not the case, there will be spaces between bars for a given x.
* The example shown here is generated by the
* <code>ClusteredXYBarRendererDemo1.java</code> program included in the
* JFreeChart demo collection:
* <br><br>
* <img src="../../../../../images/ClusteredXYBarRendererSample.png"
* alt="ClusteredXYBarRendererSample.png" />
* <P>
* This renderer does not include code to calculate the crosshair point for the
* plot.
*/
public class ClusteredXYBarRenderer extends XYBarRenderer
implements Cloneable, PublicCloneable, Serializable {
/** For serialization. */
private static final long serialVersionUID = 5864462149177133147L;
/** Determines whether bar center should be interval start. */
private boolean centerBarAtStartValue;
/**
* Default constructor. Bar margin is set to 0.0.
*/
public ClusteredXYBarRenderer() {
this(0.0, false);
}
/**
* Constructs a new XY clustered bar renderer.
*
* @param margin the percentage amount to trim from the width of each bar.
* @param centerBarAtStartValue if true, bars will be centered on the
* start of the time period.
*/
public ClusteredXYBarRenderer(double margin,
boolean centerBarAtStartValue) {
super(margin);
this.centerBarAtStartValue = centerBarAtStartValue;
}
/**
* Returns the number of passes through the dataset that this renderer
* requires. In this case, two passes are required, the first for drawing
* the shadows (if visible), and the second for drawing the bars.
*
* @return <code>2</code>.
*/
public int getPassCount() {
return 2;
}
/**
* Returns the x-value bounds for the specified dataset.
*
* @param dataset the dataset (<code>null</code> permitted).
*
* @return The bounds (possibly <code>null</code>).
*/
public Range findDomainBounds(XYDataset dataset) {
if (dataset == null) {
return null;
}
// need to handle cluster centering as a special case
if (this.centerBarAtStartValue) {
return findDomainBoundsWithOffset((IntervalXYDataset) dataset);
}
else {
return super.findDomainBounds(dataset);
}
}
/**
* Iterates over the items in an {@link IntervalXYDataset} to find
* the range of x-values including the interval OFFSET so that it centers
* the interval around the start value.
*
* @param dataset the dataset (<code>null</code> not permitted).
*
* @return The range (possibly <code>null</code>).
*/
protected Range findDomainBoundsWithOffset(IntervalXYDataset dataset) {
if (dataset == null) {
throw new IllegalArgumentException("Null 'dataset' argument.");
}
double minimum = Double.POSITIVE_INFINITY;
double maximum = Double.NEGATIVE_INFINITY;
int seriesCount = dataset.getSeriesCount();
double lvalue;
double uvalue;
for (int series = 0; series < seriesCount; series++) {
int itemCount = dataset.getItemCount(series);
for (int item = 0; item < itemCount; item++) {
lvalue = dataset.getStartXValue(series, item);
uvalue = dataset.getEndXValue(series, item);
double offset = (uvalue - lvalue) / 2.0;
lvalue = lvalue - offset;
uvalue = uvalue - offset;
minimum = Math.min(minimum, lvalue);
maximum = Math.max(maximum, uvalue);
}
}
if (minimum > maximum) {
return null;
}
else {
return new Range(minimum, maximum);
}
}
/**
* Draws the visual representation of a single data item. This method
* is mostly copied from the superclass, the change is that in the
* calculated space for a singe bar we draw bars for each series next to
* each other. The width of each bar is the available width divided by
* the number of series. Bars for each series are drawn in order left to
* right.
*
* @param g2 the graphics device.
* @param state the renderer state.
* @param dataArea the area within which the plot is being drawn.
* @param info collects information about the drawing.
* @param plot the plot (can be used to obtain standard color
* information etc).
* @param domainAxis the domain axis.
* @param rangeAxis the range axis.
* @param dataset the dataset.
* @param series the series index.
* @param item the item index.
* @param crosshairState crosshair information for the plot
* (<code>null</code> permitted).
* @param pass the pass index.
*/
public void drawItem(Graphics2D g2,
XYItemRendererState state,
Rectangle2D dataArea,
PlotRenderingInfo info,
XYPlot plot,
ValueAxis domainAxis,
ValueAxis rangeAxis,
XYDataset dataset, int series, int item,
CrosshairState crosshairState,
int pass) {
IntervalXYDataset intervalDataset = (IntervalXYDataset) dataset;
double y0;
double y1;
if (getUseYInterval()) {
y0 = intervalDataset.getStartYValue(series, item);
y1 = intervalDataset.getEndYValue(series, item);
}
else {
y0 = getBase();
y1 = intervalDataset.getYValue(series, item);
}
if (Double.isNaN(y0) || Double.isNaN(y1)) {
return;
}
double yy0 = rangeAxis.valueToJava2D(y0, dataArea,
plot.getRangeAxisEdge());
double yy1 = rangeAxis.valueToJava2D(y1, dataArea,
plot.getRangeAxisEdge());
RectangleEdge xAxisLocation = plot.getDomainAxisEdge();
double x0 = intervalDataset.getStartXValue(series, item);
double xx0 = domainAxis.valueToJava2D(x0, dataArea, xAxisLocation);
double x1 = intervalDataset.getEndXValue(series, item);
double xx1 = domainAxis.valueToJava2D(x1, dataArea, xAxisLocation);
double intervalW = xx1 - xx0; // this may be negative
double baseX = xx0;
if (this.centerBarAtStartValue) {
baseX = baseX - intervalW / 2.0;
}
double m = getMargin();
if (m > 0.0) {
double cut = intervalW * getMargin();
intervalW = intervalW - cut;
baseX = baseX + (cut / 2);
}
double intervalH = Math.abs(yy0 - yy1); // we don't need the sign
PlotOrientation orientation = plot.getOrientation();
int numSeries = dataset.getSeriesCount();
double seriesBarWidth = intervalW / numSeries; // may be negative
Rectangle2D bar = null;
if (orientation == PlotOrientation.HORIZONTAL) {
double barY0 = baseX + (seriesBarWidth * series);
double barY1 = barY0 + seriesBarWidth;
double rx = Math.min(yy0, yy1);
double rw = intervalH;
double ry = Math.min(barY0, barY1);
double rh = Math.abs(barY1 - barY0);
bar = new Rectangle2D.Double(rx, ry, rw, rh);
}
else if (orientation == PlotOrientation.VERTICAL) {
double barX0 = baseX + (seriesBarWidth * series);
double barX1 = barX0 + seriesBarWidth;
double rx = Math.min(barX0, barX1);
double rw = Math.abs(barX1 - barX0);
double ry = Math.min(yy0, yy1);
double rh = intervalH;
bar = new Rectangle2D.Double(rx, ry, rw, rh);
}
boolean positive = (y1 > 0.0);
boolean inverted = rangeAxis.isInverted();
RectangleEdge barBase;
if (orientation == PlotOrientation.HORIZONTAL) {
if (positive && inverted || !positive && !inverted) {
barBase = RectangleEdge.RIGHT;
}
else {
barBase = RectangleEdge.LEFT;
}
}
else {
if (positive && !inverted || !positive && inverted) {
barBase = RectangleEdge.BOTTOM;
}
else {
barBase = RectangleEdge.TOP;
}
}
if (pass == 0 && getShadowsVisible()) {
getBarPainter().paintBarShadow(g2, this, series, item, bar, barBase,
!getUseYInterval());
}
if (pass == 1) {
getBarPainter().paintBar(g2, this, series, item, bar, barBase);
if (isItemLabelVisible(series, item)) {
XYItemLabelGenerator generator = getItemLabelGenerator(series,
item);
drawItemLabel(g2, dataset, series, item, plot, generator, bar,
y1 < 0.0);
}
// add an entity for the item...
if (info != null) {
EntityCollection entities
= info.getOwner().getEntityCollection();
if (entities != null) {
addEntity(entities, bar, dataset, series, item,
bar.getCenterX(), bar.getCenterY());
}
}
}
}
/**
* Tests this renderer for equality with an arbitrary object, returning
* <code>true</code> if <code>obj</code> is a
* <code>ClusteredXYBarRenderer</code> with the same settings as this
* renderer, and <code>false</code> otherwise.
*
* @param obj the object (<code>null</code> permitted).
*
* @return A boolean.
*/
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof ClusteredXYBarRenderer)) {
return false;
}
ClusteredXYBarRenderer that = (ClusteredXYBarRenderer) obj;
if (this.centerBarAtStartValue != that.centerBarAtStartValue) {
return false;
}
return super.equals(obj);
}
/**
* Returns a clone of the renderer.
*
* @return A clone.
*
* @throws CloneNotSupportedException if the renderer cannot be cloned.
*/
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
}
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