在JChart2D中获取光标的坐标 [英] Get coordinates of cursor in JChart2D

问题描述

我正在使用JChart2D跟踪双精度数组的值.我正在使用ZoomableChart，并且当光标停留在代码中的ZoomableChart上时，我想获取光标的坐标(x，y)，以在JLabel中显示它们并画一条垂直线.

I'm using JChart2D for trace a values of a double array. I'm using ZoomableChart and I want get coordinates (x, y) of cursor when this stay over ZoomableChart in my code to show them in a JLabel and draw a vertical line.

• 如何获取光标的坐标?
• 我怎么画这条线?

推荐答案

很简单.将 MouseMotionListener 添加到 ZoomableChart .

To get a point is easy. Add a MouseMotionListener to the ZoomableChart.

我猜您希望此信息表示图表中数据中的点，而不是可能缩放的ZoomableChart组件本身中的点.为此，您需要查找类似的内容(浏览我今天听说过的今天"课程的文档.)

I'm guessing you want this information to represent a point in the data in the chart, rather than in the potentially zoomed ZoomableChart component itself. For that you'll need to look to something like (trawling through the docs for a class I heard of 'today'..) Chart2D.getPointFinder(), the finder apparently offers getNearestPoint(MouseEvent,Chart2D) to map a MouseEvent back to the underlying structure.

去吧！ :)

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