zedgraph EnableWheelZoom，缩放后如何获取轴值? [英] zedgraph EnableWheelZoom, how to get axis values after zooming?

问题描述

在我的 vb.net 项目中，我使用 zedgraph 绘制图形.我发现以下属性可以很好地缩放鼠标中心的图形.

In my vb.net project, I use zedgraph to draw figures. I find that the following properties work well to zoom figure on the center of mouse.

    Friend WithEvents gcMain As ZedGraph.ZedGraphControl
    Me.gcMain.IsZoomOnMouseCenter = True
    Me.gcMain.IsEnableWheelZoom = True

我有两个工具条文本框来显示 x 轴的最小值和最大值.当我更改文本框中的值时，x 轴会发生变化.以下代码显示了处理文本框的示例.但是，当使用 IsEnableWheelZoom 属性缩放图形时，我不知道如何更新文本框中的值.在zedgraph中，ZedGraphControl_MouseWheel是一个受保护的事件.

I have two toolstrip text boxes to show the minimum and maximum values of x axis. When I change values in text boxes, the x axis changes. The following code shows an example of handling the textbox. However I do not know how to update values in text boxes when the figure is zoomed by using IsEnableWheelZoom property. In zedgraph, ZedGraphControl_MouseWheel is a protected event.

 Friend WithEvents tbxRangeStart As System.Windows.Forms.ToolStripTextBox
     Private Sub tbxRangeStart_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles tbxRangeStart.KeyDown
    Try
        If e.KeyCode = Keys.Enter Then
            ' Change x Axis here
        End If
    Catch
    End Try
End Sub

推荐答案

使用ZoomEvent:

chart.ZoomEvent += chart_ZoomEvent
...
private void chart_ZoomEvent(ZedGraphControl sender, ZoomState oldState, ZoomState newState)
{
    textBoxMax.Text = chart.GraphPane.XAxis.Scale.Max.ToString();
    textBoxMin.Text = chart.GraphPane.XAxis.Scale.Min.ToString();
}

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