WPF Update lines

Question

我正试图在wpf(vb.net(中复制我以前在winform中制作的一个应用程序。在旧的应用程序中，我基本上打开一个二进制文件，将其加载到一个数组中，然后用它绘制一个二维折线图。文件的大小大约为2/4MB，所以我放了一个滑块，每次更改它时，我都会调用滑块偏移的绘图子。现在我对wpf完全陌生，我知道如何绘制图表，但我不明白当我移动滑块时，或者(下一步(当我通过代码更改数组的值时，如何更新它。为了进行简单的测试，我在启动时加载了一个文件，当按钮1点击时，我修改了数组值，我会看到更新图表，但我还没有找到方法。

<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:testwpf2d"
mc:Ignorable="d"
Title="MainWindow" Height="1920" Width="1080">
<Grid x:Name="BaseGrid">
<Canvas  Name="paintSurface" >
<Canvas.Background>
<SolidColorBrush Color="Black" Opacity="1"/>
</Canvas.Background>
<Button Content="Button" Canvas.Left="184" Canvas.Top="36" Width="75" Click="Button_Click"/>
</Canvas>
</Grid>
</Window>

Private Sub BaseGrid_Loaded(sender As Object, e As RoutedEventArgs) Handles BaseGrid.Loaded
Dim openFileDialogORI As OpenFileDialog = New OpenFileDialog()
If openFileDialogORI.ShowDialog = True Then
Try
Dim MyFileORIStream As FileStream = New FileStream(openFileDialogORI.FileName, FileMode.Open, FileAccess.Read)
Dim ORIBuffer As BinaryReader = New BinaryReader(MyFileORIStream)
Dim fInfo As New FileInfo(openFileDialogORI.FileName)
Dim numBytes As Long = fInfo.Length
MyORIArray = ORIBuffer.ReadBytes(CInt(numBytes))
ORIBuffer.Close()
MyFileORIStream.Close()

Dim NomeFileOri As String = openFileDialogORI.FileName
Dim info As New FileInfo(openFileDialogORI.FileName)
Dim length As Integer = CInt(info.Length)                
Catch ex As Exception
MsgBox(ex.Message)
End Try
End If
MessageBox.Show("File loaded")
For i As Integer = 1 To 2000
Dim Line As New Line
Line.X1 = i
Line.X2 = i + 1
Line.Y1 = MyORIArray(i)
Line.Y2 = MyORIArray(i + 1)
Line.Stroke = Brushes.YellowGreen
Line.StrokeThickness = 0.25
BaseGrid.Children.Add(Line)
Next
End Sub
Private Sub Button_Click(sender As Object, e As RoutedEventArgs)
Dim Rand As New Random
For i As Integer = 1 To 1000
MyORIArray(i) = Rand.NextDouble * 50
Next
MessageBox.Show("new data ")
BaseGrid.UpdateLayout()
paintSurface.UpdateLayout()
End Sub

Answer 1

我解决了从数组中创建点集合并绘制折线的问题，当数组点发生变化时(总是通过引发事件的用户交互(按钮、鼠标等(，我更新或重新创建点集合，然后使用update.layout。我知道这不是最好的方法，但对于这个小应用程序来说，效果很好