Winform中设置ZedGraph鼠标悬浮显示距离最近曲线上的点的坐标值和X轴与Y轴的标题

本是古典何须时尚 2023-10-08 09:48 55阅读 0赞

## 场景 ##

Winform中设置ZedGraph鼠标双击获取距离最近曲线上的点的坐标值：

[https://blog.csdn.net/BADAO\_LIUMANG\_QIZHI/article/details/102466406][https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_102466406]

现在要实现鼠标悬浮时显示距离最近曲线上的点的横纵坐标和X轴和Y轴的标题。

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70][]

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## 实现 ##

在包含ZedGraph控件的窗体的load方法中执行初始化zedGraph的方法，在初始化的方法中对鼠标悬浮事件重新绑定。

zgc.CursorValueEvent -= zgc_CursorValueEvent;       //显示焦点值事件
    zgc.CursorValueEvent += zgc_CursorValueEvent;       //显示焦点值事件

然后在显示焦点值事件中

private static string zgc_CursorValueEvent(ZedGraphControl sender, GraphPane pane, Point mousePt)
            {
                //获取ZedGraphControl对象
                ZedGraphControl zgc = sender as ZedGraphControl;
                if (zgc != null)
                {
                    //声明曲线对象
                    CurveItem nearstCurve;
                    int i;
                    Double y = 0.0;
                    string z = String.Empty;
                    string xTitle = String.Empty;
                    string yTtile = String.Empty;
                    try
                    {
                        //获取距离最近的曲线
                        zgc.GraphPane.FindNearestPoint(mousePt, out nearstCurve, out i);
                        if (nearstCurve != null && nearstCurve.Points.Count > i && nearstCurve.Points[i] != null)
                        {
                            //获取举例最近的点的Tag，在生成曲线时使用Tag存储的X轴的信息
                            z = nearstCurve.Points[i].Tag.ToString();
                            //获取当前pane面板的XAxis的标题的文本内容
                            xTitle = zgc.GraphPane.XAxis.Title.Text;
                            //获取当前pane面板的YAxis的标题的文本内容,通过nearstCurve.YAxisIndex获取当前举例最近的曲线所对应的Y轴的Index
                            yTtile = zgc.GraphPane.YAxisList[nearstCurve.YAxisIndex].Title.Text;
                            y = nearstCurve.Points[i].Y;
                        }
                    }
                    catch(Exception ex)
                    {
    
                    }
                    return "X-" + xTitle + ": " + z + "  Y-" + yTtile +": "+ y.ToString();
                }
                else
                {
                    return String.Empty;
                }
            }

[https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_102466406]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/102466406
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191119135427988.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70
[https_blog.csdn.net_badao_liumang_qizhi]: https://blog.csdn.net/badao_liumang_qizhi