1.显示节点值

XYLineAndShapeRenderer renderer = new

XYLineAndShapeRenderer();​

// 显示节点的值

renderer.setBaseItemLabelsVisible(true);

renderer.setBasePositiveItemLabelPosition(new

ItemLabelPosition(

ItemLabelAnchor.OUTSIDE12, TextAnchor.BASELINE_CENTER));

renderer.setBaseItemLabelGenerator(new

StandardXYItemLabelGenerator());

renderer.setBaseItemLabelPaint(new Color(102, 102, 102));//

显示折点数值字体的颜色

2.当双击鼠标时，显示标尺，再双击消失。

boolean

domainCrosshairState​

= false；

chartPanel.addChartMouseListener(new ChartMouseListener() {

public void chartMouseMoved(ChartMouseEvent arg0) {}

public void chartMouseClicked(ChartMouseEvent e) {

if(e.getTrigger().getClickCount() == 2){

chartPanel.setHorizontalAxisTrace(domainCrosshairState);

// 双击竖线

domainCrosshairState =

!domainCrosshairState;​

}...

3.在一条折线图上，实现新增两条竖线，双击显示标尺，单击时，竖线移动到鼠标位置

chartPanel.addChartMouseListener(new ChartMouseListener()

{

public void chartMouseMoved(ChartMouseEvent arg0) {}

public void chartMouseClicked(ChartMouseEvent e) {

if(e.getTrigger().getClickCount() == 2){

domainCrosshairState =

!domainCrosshairState;

chartPanel.setHorizontalAxisTrace(domainCrosshairState); //

双击竖线

//数据点可见

XYSeriesCollection tsc = seriesInfo;//总的

@SuppressWarnings("unchecked")

List seri = tsc.getSeries();

XYPlot plot = (XYPlot)jfreechart.getPlot();

XYLineAndShapeRenderer xyLineAndShapeRenderer =

(XYLineAndShapeRenderer)plot.getRenderer();

if(domainCrosshairState){

xyLineAndShapeRenderer.setSeriesShapesVisible(0,

true); // 数据点可见

}else{

//数据点不可见

xyLineAndShapeRenderer.setSeriesShapesVisible(0,

false); // 数据点可见

}

}else

if(e.getTrigger().getClickCount() == 1

&&

domainCrosshairState){//选择好位置

//释放时显示最终的线

XYSeriesCollection tsc = seriesInfo;//总的

@SuppressWarnings("unchecked")

List

seri = tsc.getSeries();

for(int

i = 0; i < seri.size(); i++){

//根据X轴判断是哪一条线

String key =

seri.get(i).getKey().toString();

if(select.equals(key)){

tsc.removeSeries(seri.get(i));

XYSeries a = new

XYSeries(select);

a.add(XValue, 0);

a.add(XValue,

yMaxValue);

tsc.addSeries(a);

seriesInfo = tsc;//赋值

}

}

}

}

});

chartPanel.addMouseListener(new MouseListener()

{

public void mouseReleased(MouseEvent e) {

//获取鼠标点击的位置与图的关系​

Point2D p =

chartPanel.translateScreenToJava2D(e.getPoint());

Rectangle2D plotArea =

chartPanel.getScreenDataArea();

XYPlot plot = (XYPlot)

jfreechart.getPlot(); // your plot

XValue =

plot.getDomainAxis().java2DToValue(p.getX(), plotArea,

plot.getDomainAxisEdge());

}

public void mousePressed(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mouseEntered(MouseEvent e) {}

public void mouseClicked(MouseEvent e) {}

});

chartPanel.addMouseMotionListener(new

MouseMotionListener() {

public void mouseMoved(MouseEvent arg0) {}

public void mouseDragged(MouseEvent e) {}

});

​