JFreeChart line chart with text at each point
The StandardXYItemLabelGenerator
should work; there's an example here.
Addendum: The labels you can see in the picture are in a separate string array.
Such labels may be incorporated in the XYDataset
, as shown in LabeledXYDataset
below. Because none of the features of StandardXYItemLabelGenerator
are used, a custom implementation of XYItemLabelGenerator
is sufficient. The XYItemRenderer
controls the color, size and relative position of the labels.
Addendum: How can I add tooltips?
Guided by ChartFactory.createXYLineChart()
, simply specify a XYToolTipGenerator
to the renderer. The default format, seen here, is Series: (x, y)
.
renderer.setBaseToolTipGenerator(new StandardXYToolTipGenerator());
import java.awt.Color;
import java.awt.Dimension;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import org.jfree.chart.*;
import org.jfree.chart.axis.NumberAxis;
import org.jfree.chart.labels.ItemLabelAnchor;
import org.jfree.chart.labels.ItemLabelPosition;
import org.jfree.chart.labels.XYItemLabelGenerator;
import org.jfree.chart.labels.StandardXYToolTipGenerator;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer;
import org.jfree.data.xy.AbstractXYDataset;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.TextAnchor;
/** @see https://stackoverflow.com/a/14459322/230513 */
public class UnitPrice {
private static XYDataset createDataset() {
LabeledXYDataset ds = new LabeledXYDataset();
ds.add(11, 0, "");
ds.add(12, 68, "A");
ds.add(13, 65, "B");
ds.add(14, 67, "C");
ds.add(15, 69, "D");
ds.add(16, 60, "F");
ds.add(17, 83, "G");
ds.add(18, 86, "H");
ds.add(19, 70, "I");
ds.add(20, 60, "J");
ds.add(21, 55, "K");
ds.add(22, 54, "L");
ds.add(23, 50, "M");
return ds;
}
private static class LabeledXYDataset extends AbstractXYDataset {
private static final int N = 26;
private List<Number> x = new ArrayList<Number>(N);
private List<Number> y = new ArrayList<Number>(N);
private List<String> label = new ArrayList<String>(N);
public void add(double x, double y, String label){
this.x.add(x);
this.y.add(y);
this.label.add(label);
}
public String getLabel(int series, int item) {
return label.get(item);
}
@Override
public int getSeriesCount() {
return 1;
}
@Override
public Comparable getSeriesKey(int series) {
return "Unit";
}
@Override
public int getItemCount(int series) {
return label.size();
}
@Override
public Number getX(int series, int item) {
return x.get(item);
}
@Override
public Number getY(int series, int item) {
return y.get(item);
}
}
private static class LabelGenerator implements XYItemLabelGenerator {
@Override
public String generateLabel(XYDataset dataset, int series, int item) {
LabeledXYDataset labelSource = (LabeledXYDataset) dataset;
return labelSource.getLabel(series, item);
}
}
private static JFreeChart createChart(final XYDataset dataset) {
NumberAxis domain = new NumberAxis("Unit");
NumberAxis range = new NumberAxis("Price");
domain.setAutoRangeIncludesZero(false);
XYItemRenderer renderer = new XYLineAndShapeRenderer(true, false);
renderer.setBaseItemLabelGenerator(new LabelGenerator());
renderer.setBaseItemLabelPaint(Color.green.darker());
renderer.setBasePositiveItemLabelPosition(
new ItemLabelPosition(ItemLabelAnchor.CENTER, TextAnchor.CENTER));
renderer.setBaseItemLabelFont(
renderer.getBaseItemLabelFont().deriveFont(14f));
renderer.setBaseItemLabelsVisible(true);
renderer.setBaseToolTipGenerator(new StandardXYToolTipGenerator());
XYPlot plot = new XYPlot(dataset, domain, range, renderer);
JFreeChart chart = new JFreeChart(
"Unit Price", JFreeChart.DEFAULT_TITLE_FONT, plot, false);
return chart;
}
public static void main(String[] args) {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
XYDataset dataset = createDataset();
JFreeChart chart = createChart(dataset);
ChartPanel chartPanel = new ChartPanel(chart) {
@Override
public Dimension getPreferredSize() {
return new Dimension(400, 320);
}
};
f.add(chartPanel);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}
Use XYTextAnnotation
:
for(int i = 0; i < data.length; i++){
XYTextAnnotation textAnnotaion = new XYTextAnnotation(
"" + data[i][anotation], data[i][X], data[i][Y]);
plot.addAnnotation(textAnnotaion);
}