如何在JFreechart中使用xybubblerenderer实现类别图？ 我想要一个类别图，显示每个类别的几个气泡。 使用气泡的x值将这些气泡放置在图的y轴上，并且气泡的y值确定其面积。 所以每个类别都有泡沫。它们在图上的x位置可以是随机的。一个值控制它们在图上的y位置，另一个值控制它们的区域。
答案 0 :(得分：0)
可以使用SymbolAxis和XYBubbleRenderer完成。必须确保气泡的x值在[0，n]和[0，n]范围内，在符号轴中分配了适当的标签。
答案 1 :(得分：0)
否则你必须编写自己的CategoryBubbleRenderer，我已经这样做了，它可以工作，这里是我的代码
/**
* Title: CategoryBubbleRenderer
* Description:
* Copyright: Copyright (c) 2001
* Company:
*
* Based on XYBubbleRenderer and BarRenderer
*
*/
import org.jfree.chart.LegendItem;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.AbstractCategoryItemRenderer;
import org.jfree.chart.renderer.category.CategoryItemRendererState;
import org.jfree.data.category.CategoryDataset;
import org.jfree.ui.RectangleEdge;
import org.jfree.util.PublicCloneable;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;
/**
* A renderer that draws a circle at each data point with a diameter that is
* determined by the z-value in the dataset.
*/
public class CategoryBubbleRenderer extends AbstractCategoryItemRenderer
implements Cloneable, PublicCloneable/*, Serializable*/ {
/** For serialization. */
//public static final long serialVersionUID = -5221991598674249125L;
public CategoryBubbleRenderer() {
super();
setBaseLegendShape(new Ellipse2D.Double(-4.0,-4.0,8.0,8.0));
}
/*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) {*/
public void drawItem(Graphics2D g2,
CategoryItemRendererState state,
Rectangle2D dataArea,
CategoryPlot plot,
CategoryAxis domainAxis,
ValueAxis rangeAxis,
CategoryDataset dataset,
int row,
int column,
int pass) {
// nothing is drawn if the row index is not included in the list with
// the indices of the visible rows...
int visibleRow = state.getVisibleSeriesIndex(row);
if (visibleRow < 0) {
return;
}
// nothing is drawn for null values...
Number dataValue = dataset.getValue(row, column);
if (dataValue == null) {
return;
}
int series = row;
int item = column;
PlotOrientation orientation = plot.getOrientation();
// get the data point...
//double x = dataset.getXValue(series, item);
//double y = dataset.getYValue(series, item);
double y = dataValue.doubleValue();
double z = Double.NaN;
double d1 = rangeAxis.getUpperBound();
double d2 = rangeAxis.getLowerBound();
z = (d2-d1)/10;//just an attempt to calculate a good default value
if (!Double.isNaN(z)) {
RectangleEdge domainAxisLocation = plot.getDomainAxisEdge();
RectangleEdge rangeAxisLocation = plot.getRangeAxisEdge();
//double transX = domainAxis.valueToJava2D(x, dataArea, domainAxisLocation);
//double transX = domainAxis.getCategoryStart(column, getColumnCount(), dataArea, plot.getDomainAxisEdge());
double transX = domainAxis.getCategoryMiddle(column, getColumnCount(),
dataArea, plot.getDomainAxisEdge()) - state.getBarWidth()
/ 2.0;
double transY = rangeAxis.valueToJava2D(y, dataArea, rangeAxisLocation);
double zero2 = rangeAxis.valueToJava2D(0.0, dataArea,
rangeAxisLocation);
double transRange = zero2 - rangeAxis.valueToJava2D(z, dataArea,
rangeAxisLocation);
double transDomain = transRange;
transDomain = Math.abs(transDomain);
transRange = Math.abs(transRange);
Ellipse2D circle = null;
if (orientation == PlotOrientation.VERTICAL) {
circle = new Ellipse2D.Double(transX - transDomain / 2.0,
transY - transRange / 2.0, transDomain, transRange);
}
else if (orientation == PlotOrientation.HORIZONTAL) {
circle = new Ellipse2D.Double(transY - transRange / 2.0,
transX - transDomain / 2.0, transRange, transDomain);
}
g2.setPaint(getItemPaint(series, item));
g2.fill(circle);
g2.setStroke(getItemOutlineStroke(series, item));
g2.setPaint(getItemOutlinePaint(series, item));
g2.draw(circle);
if (isItemLabelVisible(series, item)) {
if (orientation == PlotOrientation.VERTICAL) {
drawItemLabel(g2, orientation, dataset, series, item,
transX, transY, false);
}
else if (orientation == PlotOrientation.HORIZONTAL) {
drawItemLabel(g2, orientation, dataset, series, item,
transY, transX, false);
}
}
// add an entity if this info is being collected
/*EntityCollection entities = null;
if (info != null) {
entities = info.getOwner().getEntityCollection();
if (entities != null && circle.intersects(dataArea)) {
addEntity(entities, circle, dataset, series, item,
circle.getCenterX(), circle.getCenterY());
}
}
int domainAxisIndex = plot.getDomainAxisIndex(domainAxis);
int rangeAxisIndex = plot.getRangeAxisIndex(rangeAxis);
updateCrosshairValues(crosshairState, x, y, domainAxisIndex,
rangeAxisIndex, transX, transY, orientation);
*/
}
}
/**
* Returns a legend item for the specified series. The default method
* is overridden so that the legend displays circles for all series.
*
* @param datasetIndex the dataset index (zero-based).
* @param series the series index (zero-based).
*
* @return A legend item for the series.
*/
public LegendItem getLegendItem(int datasetIndex, int series) {
LegendItem result = null;
CategoryPlot plot = getPlot();
if (plot == null) {
return null;
}
CategoryDataset dataset = plot.getDataset(datasetIndex);
if (dataset != null) {
if (getItemVisible(series, 0)) {
String label = getLegendItemLabelGenerator().generateLabel(
dataset, series);
String description = label;
String toolTipText = null;
if (getLegendItemToolTipGenerator() != null) {
toolTipText = getLegendItemToolTipGenerator().generateLabel(
dataset, series);
}
String urlText = null;
if (getLegendItemURLGenerator() != null) {
urlText = getLegendItemURLGenerator().generateLabel(
dataset, series);
}
Shape shape = lookupLegendShape(series);
Paint paint = lookupSeriesPaint(series);
Paint outlinePaint = lookupSeriesOutlinePaint(series);
Stroke outlineStroke = lookupSeriesOutlineStroke(series);
result = new LegendItem(label, description, toolTipText,
urlText, shape, paint, outlineStroke, outlinePaint);
result.setLabelFont(lookupLegendTextFont(series));
Paint labelPaint = lookupLegendTextPaint(series);
if (labelPaint != null) {
result.setLabelPaint(labelPaint);
}
result.setDataset(dataset);
result.setDatasetIndex(datasetIndex);
//result.setSeriesKey(dataset.getSeriesKey(series));
result.setSeriesKey(dataset.getRowKey(series));
result.setSeriesIndex(series);
}
}
return result;
}
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof CategoryBubbleRenderer)) {
return false;
}
CategoryBubbleRenderer that = (CategoryBubbleRenderer) obj;
return super.equals(obj);
}
public Object clone() throws CloneNotSupportedException {
return super.clone();
}
}