MSChartControl 选择时的奇怪行为
我在我的应用程序中使用 MSChartControl。在图表控件中，我显示一个图像，我想使用图表控件的选择机制来使用 ChartArea 中的 CursorX 选择图像范围。
在 SelectionRangeChanged 事件中，我想在用户完成选择时收到通知，然后我想对尚未选择的区域进行着色并隐藏原始选择。
由于没有ClearSelection（至少我还没有找到这样的方法），我将选择设置为未完成选择时光标最初具有的值：
private void chartTopoAP_SelectionRangeChanged(object sender, CursorEventArgs e)
{
int Start = (int)e.NewSelectionStart;
int End = (int)e.NewSelectionEnd;
MathUtil.SwapIf(Start > End, ref Start, ref End);
mySelectedRange = new Tuple<int, int>(Start, End);
chartTopoAP.ChartAreas[0].CursorX.SetSelectionPosition(double.NaN, double.NaN);
chartTopoAP.Invalidate();
chartTopoAP.Update();
}
在paint方法中我自己进行绘画。
除非我调整窗口和图表控件的大小，否则这似乎有效。
1）我启动窗口，然后选择一些内容 2）我调整图表控件的大小（更大/更小并不重要） 3）我做了另一个选择
->结果是，显然该控件已在内部缓冲了一些图形，并向我显示了调整控件大小之前的图表大小。
如果我注释掉该行，
chartTopoAP.ChartAreas[0].CursorX.SetSelectionPosition(double.NaN, double.NaN);
它就可以工作。但我该如何清除选择呢？
谢谢 马丁
I'm using the MSChartControl in my application. In the chart control I display an image where I want to use the selection mechanism of the chart control to select a range of the image using the CursorX from the ChartArea.
In the SelectionRangeChanged event I want to get informed when a selection has been done by the user and then I want to colorize the areas that haven't been selected and hide the original selection.
Since there is no ClearSelection (at least I haven't found such a method), I set the selection to a value that the Cursor initially had when no selection was done:
private void chartTopoAP_SelectionRangeChanged(object sender, CursorEventArgs e)
{
int Start = (int)e.NewSelectionStart;
int End = (int)e.NewSelectionEnd;
MathUtil.SwapIf(Start > End, ref Start, ref End);
mySelectedRange = new Tuple<int, int>(Start, End);
chartTopoAP.ChartAreas[0].CursorX.SetSelectionPosition(double.NaN, double.NaN);
chartTopoAP.Invalidate();
chartTopoAP.Update();
}
In the paint method I do my own painting.
This is seems to work unless I resize the window and the chartcontrol.
1) I start the window, and select something
2) I resize the chartcontrol (larger/smaller doesn't matter)
3) I do another selection
-> The result is, that obviously the control has buffered some graphics internally and shows me the chart with a size that I had before resizing the control.
If I comment out the line
chartTopoAP.ChartAreas[0].CursorX.SetSelectionPosition(double.NaN, double.NaN);
it works. But how would I clear a selection then?
Thanks
Martin
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这似乎与scaleview缩放设置有关。如果在重置选择后添加
，症状就会消失。
It seems to be related to scaleview zoom settings. if you add
after reseting the selection, the symptom goes away.