使用JFreeChart上下拖动点后获取值
下面的代码绘制了可以向下拖动的点。但是现在我想在拖动后获得每个点的Y轴（速度）的更新值，并再次使用这些更新的值绘制。最初在Y轴上的速度设置为4，但在拖动之后我想获得更新的速度值。
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import org.jfree.chart.*;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.ChartEntity;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.entity.XYItemEntity;
import org.jfree.chart.labels.StandardXYSeriesLabelGenerator;
import org.jfree.chart.plot.PlotOrientation;
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.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
/**
* @see http://stackoverflow.com/a/38711095/230513
* @see http://www.jfree.org/forum/viewtopic.php?f=3&t=30569
*/
public class SeriesAndPointDragAndMove extends ApplicationFrame
implements ChartMouseListener, MouseListener, MouseMotionListener {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
SeriesAndPointDragAndMove app = new SeriesAndPointDragAndMove("Plot");
app.pack();
RefineryUtilities.centerFrameOnScreen(app);
app.setVisible(true);
}
});
}
private boolean canMove = false;
private double finalMovePointY = 0;
private ChartRenderingInfo info = null;
private double initialMovePointY = 0;
private JFreeChart jFreeChart = null;
private ChartPanel chartPanel = null;
private XYSeries series = new XYSeries("Series");
private XYSeriesCollection collection = new XYSeriesCollection();
private XYItemEntity xyItemEntity = null;
public SeriesAndPointDragAndMove(String paramString) {
super(paramString);
jFreeChart = ChartFactory.createXYLineChart(
"Drag Point", "Points (Index)", "Velocity (m/s)",
createDataset(), PlotOrientation.VERTICAL, true, true, false);
chartPanel = new ChartPanel(jFreeChart) {
@Override
public Dimension getPreferredSize() {
return new Dimension(640, 480);
}
};
chartPanel.addChartMouseListener(this);
chartPanel.addMouseMotionListener(this);
chartPanel.addMouseListener(this);
chartPanel.setAutoscrolls(false);
chartPanel.setMouseZoomable(false);
this.info = chartPanel.getChartRenderingInfo();
XYPlot localXYPlot = (XYPlot) jFreeChart.getPlot();
XYItemRenderer localXYItemRenderer = localXYPlot.getRenderer();
localXYItemRenderer.setSeriesStroke(0, new BasicStroke(2.0F));
XYLineAndShapeRenderer localXYLineAndShapeRenderer
= (XYLineAndShapeRenderer) localXYPlot.getRenderer();
localXYLineAndShapeRenderer.setBaseShapesVisible(true);
localXYLineAndShapeRenderer.setSeriesFillPaint(0, Color.white);
localXYLineAndShapeRenderer.setUseFillPaint(true);
localXYLineAndShapeRenderer.setLegendItemToolTipGenerator(
new StandardXYSeriesLabelGenerator("Tooltip {0}"));
ValueAxis range = localXYPlot.getRangeAxis();
range.setLowerBound(0);
range.setUpperBound(20);
setContentPane(chartPanel);
}
@Override
public void chartMouseClicked(ChartMouseEvent paramChartMouseEvent) {
}
@Override
public void chartMouseMoved(ChartMouseEvent paramChartMouseEvent) {
}
public XYDataset createDataset() {
for (int i = 0; i < 8; i++) {
series.add(i, 4);
}
collection.addSeries(series);
return collection;
}
@Override
public void mouseClicked(MouseEvent e) {
}
@Override
public void mouseDragged(MouseEvent e) {
movePoint(e);
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
canMove = false; // stop movement if cursor is out from the chart area
initialMovePointY = 0;
chartPanel.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
}
public void mouseMoved(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
int x = e.getX(); // initialized point whenenver mouse is pressed
int y = e.getY();
EntityCollection entities = this.info.getEntityCollection();
ChartMouseEvent cme = new ChartMouseEvent(jFreeChart, e, entities
.getEntity(x, y));
ChartEntity entity = cme.getEntity();
if ((entity != null) && (entity instanceof XYItemEntity)) {
xyItemEntity = (XYItemEntity) entity;
} else if (!(entity instanceof XYItemEntity)) {
xyItemEntity = null;
return;
}
if (xyItemEntity == null) {
return; // return if not pressed on any series point
}
Point pt = e.getPoint();
XYPlot xy = jFreeChart.getXYPlot();
Rectangle2D dataArea = chartPanel.getChartRenderingInfo()
.getPlotInfo().getDataArea();
Point2D p = chartPanel.translateScreenToJava2D(pt);
initialMovePointY = xy.getRangeAxis().java2DToValue(p.getY(), dataArea,
xy.getRangeAxisEdge());
canMove = true;
chartPanel.setCursor(new Cursor(Cursor.HAND_CURSOR));
}
@Override
public void mouseReleased(MouseEvent e) {
// stop dragging on mouse released
canMove = false;
initialMovePointY = 0;
chartPanel.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
}
public void movePoint(MouseEvent me) {
if (canMove) {
int itemIndex = xyItemEntity.getItem();
Point pt = me.getPoint();
XYPlot xy = jFreeChart.getXYPlot();
Rectangle2D dataArea = chartPanel.getChartRenderingInfo()
.getPlotInfo().getDataArea();
Point2D p = chartPanel.translateScreenToJava2D(pt);
finalMovePointY = xy.getRangeAxis().java2DToValue(p.getY(),
dataArea, xy.getRangeAxisEdge());
double difference = finalMovePointY - initialMovePointY;
if (series.getY(itemIndex).doubleValue()
+ difference > xy.getRangeAxis().getRange().getLength()
|| series.getY(itemIndex).doubleValue()
+ difference < 0.0D) {
initialMovePointY = finalMovePointY;
}
// retrict movement for upper and lower limit (upper limit
// should be as per application needs)
double targetPoint = series.getY(itemIndex).doubleValue() + difference;
if (targetPoint > 15 || targetPoint < 0) {
return;
} else {
series.update(Integer.valueOf(itemIndex), Double.valueOf(targetPoint));
}
jFreeChart.fireChartChanged();
chartPanel.updateUI();
initialMovePointY = finalMovePointY;
}
}
public void moveSeries(MouseEvent me) {
if (canMove) {
Point pt = me.getPoint();
XYPlot xy = jFreeChart.getXYPlot();
Rectangle2D dataArea = chartPanel.getChartRenderingInfo()
.getPlotInfo().getDataArea();
Point2D p = chartPanel.translateScreenToJava2D(pt);
finalMovePointY = xy.getRangeAxis().java2DToValue(p.getY(),
dataArea, xy.getRangeAxisEdge());
double difference = finalMovePointY - initialMovePointY;
for (int i = 0; i < series.getItemCount(); i++) {
System.out.println(series.getItemCount());
if (series.getY(i).doubleValue() + difference > xy.getRangeAxis().getRange().getLength()
|| series.getY(i).doubleValue()
+ difference < 0.0D) {
initialMovePointY = finalMovePointY;
}
}
// retrict movement for upper and lower limit (upper limit
// should be as per application needs)
for (int i = 0; i < series.getItemCount(); i++) {
double targetPoint = series.getY(i)
.doubleValue()
+ difference;
if (targetPoint > 50 || targetPoint < 0) {
return;
}
}
for (int i = 0; i < series.getItemCount(); i++) {
double targetPoint = series.getY(i)
.doubleValue()
+ difference;
series.update(Integer.valueOf(i), Double.valueOf(targetPoint));
}
jFreeChart.fireChartChanged();
chartPanel.updateUI();
initialMovePointY = finalMovePointY;
}
}
}
1 个答案:
答案 0 :(得分：1)
要接收XYSeries更改通知，请添加SeriesChangeListener，如下所示：
public SeriesAndPointDragAndMove(String paramString) {
…
series.addChangeListener(new SeriesChangeListener() {
@Override
public void seriesChanged(SeriesChangeEvent e) {
XYSeries series = (XYSeries) e.getSource();
System.out.println(series.getItems());
}
});
}
输出为横坐标为3.0的点从速度4.0移动到5.0：
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.053908355795149], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]]
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.107816711590297], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]]
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.161725067385444], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]]
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.215633423180593], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]]
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.323450134770890], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]]
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.431266846361186], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]]
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.485175202156334], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]]
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.539083557951483], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]]
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.592991913746631], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]]
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.646900269541780], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]]
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.700808625336927], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]]
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.754716981132076], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]]
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.862533692722372], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]]
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.916442048517521], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]]
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.9703504043126685], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]]
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 4.9703504043126685], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]]
[[0.0, 4.0], [1.0, 4.0], [2.0, 4.0], [3.0, 5.0242587601078160], [4.0, 4.0], [5.0, 4.0], [6.0, 4.0], [7.0, 4.0]]
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