如何在Zedgraph中绘制一个扩展的交叉毛线光标，该光标在鼠标不移动时持续存在

本文关键字：光标 鼠标 毛线 移动 存在 绘制 Zedgraph 扩展 一个 | 更新日期: 2023-09-27 18:07:30

我正在使用Zedgraph创建一个股票图表应用程序。该图表有多个显示指标的窗格。我想显示一个扩展到Zedgraph控件范围的十字线光标，包括所有的图形窗格。使用下面的代码和MouseMove事件，我完成了一半的工作。然而，当鼠标停止移动时，准星就会消失。当鼠标静止时，我如何保持它们的显示?我的Zedgraph控件在下面的代码中被命名为'chtOHLC'。

#region Extended Crosshairs
private Point _mousePoint;
private void chtOHLC_MouseMove(object sender, MouseEventArgs e)
{
  _mousePoint = new Point(e.X, e.Y);
  chtOHLC.Refresh();
}
private void chtOHLC_Paint(object sender, PaintEventArgs e)
{
  if (_mousePoint != null)
  {
    Graphics g = chtOHLC.CreateGraphics();
    g.DrawLine(Pens.Black, 0, _mousePoint.Y, chtOHLC.Width, _mousePoint.Y);
    g.DrawLine(Pens.Black, _mousePoint.X, 0, _mousePoint.X, chtOHLC.Height);
    g.Dispose();
  }
} 
#endregion

如何在Zedgraph中绘制一个扩展的交叉毛线光标，该光标在鼠标不移动时持续存在

试试:将它添加到表单类

ZedGraph这是我的库实例

 private double? CrossHairX = null;
 private double? CrossHairY = null;
 LineObj xHairOld = new LineObj();
 LineObj yHairOld = new LineObj();

ZedGraph鼠标移动事件:

private void ZedGraph_MouseMove(object sender, MouseEventArgs e)
        {
            double x, y;
            ZedGraph.GraphPane.ReverseTransform(e.Location, out x, out y);
            #region crosshair
            if (x < ZedGraph.GraphPane.XAxis.Scale.Min ||
                x > ZedGraph.GraphPane.XAxis.Scale.Max ||
                y < ZedGraph.GraphPane.YAxis.Scale.Min ||
                y > ZedGraph.GraphPane.YAxis.Scale.Max
                )//out of the bounds
            {
                ZedGraph_MouseLeave(new object(), new EventArgs());
            }
            else//ok draw
            {
                if (CrossHairX != null && CrossHairY != null)
                {
                    ZedGraph.GraphPane.GraphObjList.Remove(xHairOld);
                    ZedGraph.GraphPane.GraphObjList.Remove(yHairOld);
                }
                LineObj xHair = new LineObj(ZedGraph.GraphPane.XAxis.Scale.Min, y, ZedGraph.GraphPane.XAxis.Scale.Max, y);
                LineObj yHair = new LineObj(x, ZedGraph.GraphPane.YAxis.Scale.Min, x, ZedGraph.GraphPane.YAxis.Scale.Max);
                ZedGraph.GraphPane.GraphObjList.Add(xHair);
                xHairOld = xHair;
                ZedGraph.GraphPane.GraphObjList.Add(yHair);
                yHairOld = yHair;
                CrossHairY = y;
                CrossHairX = x;

                ZedGraph.Refresh();
            }
            #endregion 
    }

鼠标离开事件

 private void ZedGraph_MouseLeave(object sender, EventArgs e)
        {
            if (CrossHairX != null && CrossHairY != null)
            {
                ZedGraph.GraphPane.GraphObjList.Remove(xHairOld);
                ZedGraph.GraphPane.GraphObjList.Remove(yHairOld);
                ZedGraph.Refresh();
            }
        }
我认为你的问题在性能上。LineObj比Graphics快
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