Scatter: GetNearest() can throw System.IndexOutOfRangeException #3461
Description
Question: My program renders Scatter in ScottPlot in real time through hardware device acquisition
referring to this example: https://github.com/ScottPlot/ScottPlot/blob/main/src/ScottPlot5/ScottPlot5%20Demos/ScottPlot5%20WinForms%20Demo/Demos/ShowValueOnHover.cs
I added the FormsPlot1_MouseMove event, but an error occurred on this line:
DataPoint nearest = Scatter.Data.GetNearest(mouseLocation, formsPlot1.Plot.LastRender);This error is sporadic, sometimes appearing, sometimes not appearing.
Thank you very much for seeing. I don't know if I've described it
Another issue is that some Scatter does not trigger MouseMove in ScottPlot
Call stack
System.IndexOutOfRangeException
HResult=0x80131508
Message=Index was outside the bounds of the array.
Source=ScottPlot
StackTrace:
在 ScottPlot.DataSources.ScatterSourceDoubleArray.GetNearest(Coordinates mouseLocation, RenderDetails renderInfo, Single maxDistance) 在 ScottPlot.DataSources\ScatterSourceDoubleArray.cs 中: 第 70 行
在 AngleTestSys.Form1.FormsPlot1_MouseMove(Object sender, MouseEventArgs e) 在 D:\jinchangyu\sunshuaize\AngleTestSys\AngleTestSys\Form1.cs 中: 第 466 行
在 System.Windows.Forms.Control.OnMouseMove(MouseEventArgs e) 在 /_/src/System.Windows.Forms/src/System/Windows/Forms/Control.cs 中: 第 8348 行
在 System.Windows.Forms.Control.OnMouseMove(MouseEventArgs e) 在 /_/src/System.Windows.Forms/src/System/Windows/Forms/Control.cs 中: 第 8348 行
在 System.Windows.Forms.Control.WmMouseMove(Message& m) 在 /_/src/System.Windows.Forms/src/System/Windows/Forms/Control.cs 中: 第 12380 行
在 System.Windows.Forms.Control.WndProc(Message& m) 在 /_/src/System.Windows.Forms/src/System/Windows/Forms/Control.cs 中: 第 13281 行
在 System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) 在 /_/src/System.Windows.Forms/src/System/Windows/Forms/Control.ControlNativeWindow.cs 中: 第 68 行
在 System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) 在 /_/src/System.Windows.Forms/src/System/Windows/Forms/Control.ControlNativeWindow.cs 中: 第 122 行
在 System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, WM msg, IntPtr wparam, IntPtr lparam) 在 /_/src/System.Windows.Forms/src/System/Windows/Forms/NativeWindow.cs 中: 第 370 行
在 Interop.User32.DispatchMessageW(MSG& msg)
在 System.Windows.Forms.Application.ComponentManager.Interop.Mso.IMsoComponentManager.FPushMessageLoop(UIntPtr dwComponentID, msoloop uReason, Void* pvLoopData) 在 /_/src/System.Windows.Forms/src/System/Windows/Forms/Application.ComponentManager.cs 中: 第 346 行
在 System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(msoloop reason, ApplicationContext context) 在 /_/src/System.Windows.Forms/src/System/Windows/Forms/Application.ThreadContext.cs 中: 第 1117 行
在 System.Windows.Forms.Application.ThreadContext.RunMessageLoop(msoloop reason, ApplicationContext context) 在 /_/src/System.Windows.Forms/src/System/Windows/Forms/Application.ThreadContext.cs 中: 第 981 行
在 System.Windows.Forms.Application.Run(Form mainForm) 在 /_/src/System.Windows.Forms/src/System/Windows/Forms/Application.cs 中: 第 1188 行
在 AngleTestSys.Program.Main() 在 D\AngleTestSys\AngleTestSys\Program.cs 中: 第 9 行
Code
private void FormsPlot1_MouseMove(object? sender, MouseEventArgs e)
{
Pixel mousePixel = new(e.Location.X, e.Location.Y);
Coordinates mouseLocation = formsPlot1.Plot.GetCoordinates(mousePixel);
if (mouseLocation.X > 0 && mouseLocation.Y > 0)
{
//
DataPoint nearest = Scatter.Data.GetNearest(mouseLocation, formsPlot1.Plot.LastRender);
if (nearest.IsReal)
{
MyCrosshair.IsVisible = true;
MyCrosshair.Position = nearest.Coordinates;
formsPlot1.Refresh();
Text = $"Selected Index={nearest.Index}, X={nearest.X:0.##}, Y={nearest.Y:0.##}";
}
// hide the crosshair when no point is selected
if (!nearest.IsReal && MyCrosshair.IsVisible)
{
MyCrosshair.IsVisible = false;
formsPlot1.Refresh();
Text = $"No point selected";
}
}
}
