Winform中设置ZedGraph鼠标悬浮显示线上的点的坐标并自定义显示的内容

不念不忘少年蓝@ 2023-10-06 10:23 24阅读 0赞

## 场景 ##

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：

[https://blog.csdn.net/BADAO\_LIUMANG\_QIZHI/article/details/103140781][https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_103140781]

在上面已经实现鼠标悬浮显示最近曲线上点的基础上，还有一种方式是鼠标经过曲线上的点是悬浮显示。

注：

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## 实现 ##

### 鼠标经过线上的点时显示坐标 ###

首先设置IsShowPointValues的属性为true

zgc.IsShowPointValues = true;

其中

ZedGraphControl zgc

为了定制鼠标悬浮显示的内容，还可以重写其PointValueEvent事件

zgc.PointValueEvent -= zgc_PointValueEvent;
    zgc.PointValueEvent += zgc_PointValueEvent;

在事件的具体方法中

private static string zgc_PointValueEvent(ZedGraphControl sender, GraphPane pane, CurveItem curve, int iPt)
            {
                //获取点
                PointPair pt = curve[iPt];
                //获取ZedGraphControl对象
                ZedGraphControl zgc = sender as ZedGraphControl;
                if (zgc != null)
                {
                   
                    Double y = 0.0;
                    string z = String.Empty;
                    string xTitle = String.Empty;
                    string yTtile = String.Empty;
                    try
                    {
    
                        //点的Tag，在生成曲线时使用Tag存储的X轴的信息
                        z = pt.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
                        yTtile = curve.Label.Text;
                        y = pt.Y;
    
                    }
                    catch (Exception ex)
                    {
                        return "";
                    }
                    return "X-" + xTitle + ": " + z + "  Y-" + yTtile + ": " + y.ToString();
    
                }
                else
                {
                    return String.Empty;
                }
               
            }

注：

可以通过PointPair pt = curve\[iPt\];获取点对象

可以通过ZedGraphControl zgc = sender as ZedGraphControl;获取ZedGraphControl对象

### 效果 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70][]

[https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_103140781]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/103140781
[https_blog.csdn.net_badao_liumang_qizhi]: https://blog.csdn.net/badao_liumang_qizhi
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200605121052899.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JBREFPX0xJVU1BTkdfUUlaSEk=,size_16,color_FFFFFF,t_70