Winform中设置ZedGraph鼠标焦点位置画出十字线并在鼠标移出时十字线消失

╰+哭是因爲堅強的太久メ 2023-10-11 13:41 7阅读 0赞

## 场景 ##

Winforn中设置ZedGraph曲线图的属性、坐标轴属性、刻度属性：

[https://blog.csdn.net/BADAO\_LIUMANG\_QIZHI/article/details/100112573][https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_100112573]

在鼠标经过曲线附近时获取最近曲线以及曲线上点的坐标，并以此坐标表示一条十字线。

### 效果 ###

![20190930160444947.gif][]

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## 实现 ##

绑定鼠标移动事件

zgc.MouseMove += zgc_MouseMove;

其中zgc是 ZedGraphControl zgc

private static void zgc_MouseMove(object sender, MouseEventArgs e)
            {
                using (Graphics gc = Global.zedGraphControl1.CreateGraphics())
                using (Pen pen = new Pen(Color.Green))
                {
                    //设置画笔的宽度
                    pen.Width = 1;
                    pen.DashStyle = System.Drawing.Drawing2D.DashStyle.DashDot;
                    RectangleF rect = Global.zedGraphControl1.GraphPane.Chart.Rect;
                    //确保在画图区域
                    if (rect.Contains(e.Location))
                    {
                        Global.zedGraphControl1.Refresh();
                        //画竖线
                        gc.DrawLine(pen, e.X, rect.Top, e.X, rect.Bottom);
                        //画横线
                        gc.DrawLine(pen, rect.Left, e.Y, rect.Right, e.Y);
    
    
                    }
                }
            }

注：

Global.zedGraphControl1是全局域的zedGraphControl对象。

这样后会随着鼠标的移动产生十字线，但是在离开pane时怎样将画好的十字线删除掉。

绑定其鼠标移除事件

zgc.MouseLeave += zgc_MouseLeave;

实现方法

private static void zgc_MouseLeave(object sender, EventArgs e)
            {
                using (Graphics gc = Global.zedGraphControl1.CreateGraphics())
                using (Pen pen = new Pen(Color.Green))
                {
                    //设置画笔的宽度
                    pen.Width = 1;
                    pen.DashStyle = System.Drawing.Drawing2D.DashStyle.DashDot;
                    RectangleF rect = Global.zedGraphControl1.GraphPane.Chart.Rect;
                    //确保在画图区域
                    Global.zedGraphControl1.Refresh();
                    //画竖线
                    gc.DrawLine(pen, 0, 0, 0, 0);
                    //画横线
                    gc.DrawLine(pen, 0, 0, 0, 0);
                }
            }

这里采取的方法是采用将线画到原点的方式使其消失。

[https_blog.csdn.net_BADAO_LIUMANG_QIZHI_article_details_100112573]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/100112573
[20190930160444947.gif]: https://img-blog.csdnimg.cn/20190930160444947.gif
[https_blog.csdn.net_badao_liumang_qizhi]: https://blog.csdn.net/badao_liumang_qizhi