JFreeChart获取鼠标坐标

Question

在JFreeChart中有没有办法从ChartMouseEvent确定鼠标结束的x,y坐标(在绘图空间中)？我尝试使用域十字准线值,但这看起来不准确,并且滞后于实际的鼠标事件.

谢谢,

杰夫

Answer 1

鼠标坐标getTrigger()相对于ChartPanel,因此您需要转换它们:

Point2D p = chartPanel.translateScreenToJava2D(mouseChartEvent.getTrigger().getPoint());
Rectangle2D plotArea = chartPanel.getScreenDataArea();
XYPlot plot = (XYPlot) chart.getPlot(); // your plot
double chartX = plot.getDomainAxis().java2DToValue(p.getX(), plotArea, plot.getDomainAxisEdge());
double chartY = plot.getRangeAxis().java2DToValue(p.getY(), plotArea, plot.getRangeAxisEdge());