问题描述
考虑使用较小版本的@L_404_0@：
public class layeredBarChartDemo2 extends ApplicationFrame {
public layeredBarChartDemo2(final String title) {
super(title);
final double[][] data = new double[][] { { 55,60 },{ 25.0,13.0 } };
final CategoryDataset dataset = DatasetUtils.createCategoryDataset("Series ","Factor ",data);
// create the chart...
final CategoryAxis categoryAxis = new CategoryAxis("Category");
final ValueAxis valueAxis = new NumberAxis("score (%)");
final CategoryPlot plot = new CategoryPlot(dataset,categoryAxis,valueAxis,new layeredBarRenderer());
final JFreeChart chart = new JFreeChart("layered Bar Chart Demo 2",JFreeChart.DEFAULT_TITLE_FONT,plot,true);
final layeredBarRenderer renderer = (layeredBarRenderer) plot.getRenderer();
// add the chart to a panel...
final ChartPanel chartPanel = new ChartPanel(chart);
chartPanel.setPreferredSize(new java.awt.Dimension(500,270));
setContentPane(chartPanel);
}
public static void main(final String[] args) {
final layeredBarChartDemo2 demo = new layeredBarChartDemo2("layered Bar Chart Demo 2");
demo.pack();
demo.setVisible(true);
}
}
它产生：
我尝试了对其他渲染器有效的方法：
renderer.setDefaultItemLabelsVisible(true);
或者：
renderer.setSeriesItemLabelsVisible(0,true);
renderer.setSeriesItemLabelsVisible(1,true);
我还试图明确声明一个CategoryItemLabelGenerator：
renderer.setDefaultItemLabelGenerator(new CategoryItemLabelGenerator() {
@Override
public String generateRowLabel(CategoryDataset dataset,int row) {
return "sasa";
}
@Override
public String generateLabel(CategoryDataset dataset,int row,int column) {
return "lalal";
}
@Override
public String generateColumnLabel(CategoryDataset dataset,int column) {
return "ababa";
}
});
（我也尝试过使用setSeriesItemLabelGenerator(series,CategoryLabelGenerator)）。
我更改了字体和油漆，以防它们出现，但我只是看不到它们。
我使用JFreeChart 1.5.0。
解决方法
由@George Z识别为bug的明显here取决于LayeredBarRenderer的drawVerticalItem()实现将drawItemLabel()调用为here时得出的不正确值显示为
。谓词transX1 > transX2应该被反转。
作为使用v1.5时的解决方法，可以指定负 ItemLabelPosition，如下所示。
ItemLabelPosition position = new ItemLabelPosition(
ItemLabelAnchor.OUTSIDE12,TextAnchor.BASELINE_CENTER);
renderer.setDefaultNegativeItemLabelPosition(position);
PlotOrientation.VERTICAL：
当drawHorizontalItem()的实现看似正确时，肯定 ItemLabelPosition会按预期工作。
ItemLabelPosition position = new ItemLabelPosition(
ItemLabelAnchor.OUTSIDE3,TextAnchor.CENTER_LEFT);
renderer.setDefaultPositiveItemLabelPosition(position);
PlotOrientation.HORIZONTAL：
StandardCategoryToolTipGenerator
此外，here可以正常工作。您可以自定义DEFAULT_TOOL_TIP_FORMAT_STRING，如here和{{3}}所示。
renderer.setDefaultToolTipGenerator(new StandardCategoryToolTipGenerator());
代码：
import java.awt.Dimension;
import java.awt.EventQueue;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.ChartUtils;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.CategoryAxis;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.labels.ItemLabelAnchor;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.labels.StandardCategoryItemLabelGenerator;
import org.jfree.chart.labels.StandardCategoryToolTipGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.renderer.category.LayeredBarRenderer;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtils;
import org.jfree.chart.ui.ApplicationFrame;
import org.jfree.chart.ui.TextAnchor;
/** @see https://stackoverflow.com/a/63464855/230513 */
public class LayeredBarChartDemo2 extends ApplicationFrame {
private static final String TITLE = "Layered Bar Chart Demo 2";
public LayeredBarChartDemo2(final String title) {
super(title);
final double[][] data = new double[][]{{55,60},{25,13}};
final CategoryDataset dataset = DatasetUtils.createCategoryDataset("Series ","Factor ",data);
final CategoryAxis categoryAxis = new CategoryAxis("Category");
final ValueAxis valueAxis = new NumberAxis("Score (%)");
final LayeredBarRenderer renderer = new LayeredBarRenderer();
renderer.setDefaultToolTipGenerator(new StandardCategoryToolTipGenerator());
renderer.setDefaultItemLabelGenerator(new StandardCategoryItemLabelGenerator());
renderer.setDefaultItemLabelsVisible(true);
ItemLabelPosition position = new ItemLabelPosition(
ItemLabelAnchor.OUTSIDE12,TextAnchor.BASELINE_CENTER);
renderer.setDefaultNegativeItemLabelPosition(position);
final CategoryPlot plot = new CategoryPlot(dataset,categoryAxis,valueAxis,renderer);
plot.setOrientation(PlotOrientation.VERTICAL);
final JFreeChart chart = new JFreeChart(TITLE,JFreeChart.DEFAULT_TITLE_FONT,plot,true);
ChartUtils.applyCurrentTheme(chart);
add(new ChartPanel(chart) {
@Override
public Dimension getPreferredSize() {
return new Dimension(640,480);
}
});
}
public static void main(final String[] args) {
EventQueue.invokeLater(() -> {
final LayeredBarChartDemo2 demo = new LayeredBarChartDemo2(TITLE);
demo.pack();
demo.setLocationRelativeTo(null);
demo.setVisible(true);
});
}
}
我自己找到了解决方案，这是一个非传统的解决方案，但至少它似乎可以满足我的要求。
在LayeredBarRenderer#drawVerticalItem中有这部分：
// draw the item labels if there are any...
CategoryItemLabelGenerator generator = getItemLabelGenerator(row,column);
if (generator != null && isItemLabelVisible(row,column)) {
double transX1 = rangeAxis.valueToJava2D(base,dataArea,edge);
double transX2 = rangeAxis.valueToJava2D(value,edge);
drawItemLabel(g2,dataset,row,column,generator,bar,(transX1 > transX2));
}
我将LayeredBarRenderer倒置为@Override的情况下扩展了transX1>transX2和transX1<=transX2的方法：
//....
// draw the item labels if there are any...
CategoryItemLabelGenerator generator = getItemLabelGenerator(row,!(transX1 > transX2)); //here
}
//....
这与排他的CategoryItemLabelGenerator相结合，给了我想要的结果：
renderer.setDefaultItemLabelGenerator(new StandardCategoryItemLabelGenerator());
renderer.setSeriesItemLabelsVisible(0,true);
renderer.setSeriesItemLabelsVisible(1,true);
结果：
完整的替代类：
@SuppressWarnings("serial")
public class LabelFixedLayeredBarRenderer extends LayeredBarRenderer {
@Override
protected void drawVerticalItem(Graphics2D g2,CategoryItemRendererState state,Rectangle2D dataArea,CategoryPlot plot,CategoryAxis domainAxis,ValueAxis rangeAxis,CategoryDataset dataset,int row,int column) {
// nothing is drawn for null values...
Number dataValue = dataset.getValue(row,column);
if (dataValue == null) {
return;
}
// BAR X
double rectX = domainAxis.getCategoryMiddle(column,getColumnCount(),plot.getDomainAxisEdge())
- state.getBarWidth() / 2.0;
int seriesCount = getRowCount();
// BAR Y
double value = dataValue.doubleValue();
double base = 0.0;
double lclip = getLowerClip();
double uclip = getUpperClip();
if (uclip <= 0.0) { // cases 1,2,3 and 4
if (value >= uclip) {
return; // bar is not visible
}
base = uclip;
if (value <= lclip) {
value = lclip;
}
} else if (lclip <= 0.0) { // cases 5,6,7 and 8
if (value >= uclip) {
value = uclip;
} else {
if (value <= lclip) {
value = lclip;
}
}
} else { // cases 9,10,11 and 12
if (value <= lclip) {
return; // bar is not visible
}
base = getLowerClip();
if (value >= uclip) {
value = uclip;
}
}
RectangleEdge edge = plot.getRangeAxisEdge();
double transY1 = rangeAxis.valueToJava2D(base,edge);
double transY2 = rangeAxis.valueToJava2D(value,edge);
double rectY = Math.min(transY2,transY1);
double rectWidth;
double rectHeight = Math.abs(transY2 - transY1);
// draw the bar...
double shift = 0.0;
double widthFactor = 1.0;
double seriesBarWidth = getSeriesBarWidth(row);
if (!Double.isNaN(seriesBarWidth)) {
widthFactor = seriesBarWidth;
}
rectWidth = widthFactor * state.getBarWidth();
rectX = rectX + (1 - widthFactor) * state.getBarWidth() / 2.0;
if (seriesCount > 1) {
// needs to be improved !!!
shift = rectWidth * 0.20 / (seriesCount - 1);
}
Rectangle2D bar = new Rectangle2D.Double((rectX + ((seriesCount - 1 - row) * shift)),rectY,(rectWidth - (seriesCount - 1 - row) * shift * 2),rectHeight);
if (state.getElementHinting()) {
beginElementGroup(g2,dataset.getRowKey(row),dataset.getColumnKey(column));
}
Paint itemPaint = getItemPaint(row,column);
GradientPaintTransformer t = getGradientPaintTransformer();
if (t != null && itemPaint instanceof GradientPaint) {
itemPaint = t.transform((GradientPaint) itemPaint,bar);
}
g2.setPaint(itemPaint);
g2.fill(bar);
if (isDrawBarOutline() && state.getBarWidth() > BAR_OUTLINE_WIDTH_THRESHOLD) {
g2.setStroke(getItemOutlineStroke(row,column));
g2.setPaint(getItemOutlinePaint(row,column));
g2.draw(bar);
}
if (state.getElementHinting()) {
endElementGroup(g2);
}
// draw the item labels if there are any...
CategoryItemLabelGenerator generator = getItemLabelGenerator(row,column);
if (generator != null && isItemLabelVisible(row,column)) {
double transX1 = rangeAxis.valueToJava2D(base,edge);
double transX2 = rangeAxis.valueToJava2D(value,edge);
drawItemLabel(g2,!(transX1 > transX2));
}
// collect entity and tool tip information...
EntityCollection entities = state.getEntityCollection();
if (entities != null) {
addItemEntity(entities,bar);
}
}
}
P.S：我没有测试当绘图水平放置时默认情况下是否可以工作以及是否需要对drawHorizontalItem做同样的事情。