WPF - RotateTransform

這篇來測試一下旋轉的效果，旋轉的效果是將RotateTransForm設定給控制項的RenderTransForm屬性，執行的結果像下面這樣

下面我們就來看看測試的程式碼吧

Imports System.Windows
Imports System.IO
Imports System.Reflection

Class Window1

    Dim cv As Canvas
    Dim myT As Threading.DispatcherTimer
    Dim btnOther As New Button
    Dim rotatePoint As Double = 0

    Private Sub Window1_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded
        cv = New Canvas
        Me.Content = cv

        For z As Integer = 0 To 9
            Dim btn As New Button
            btn.Name = "btn_" & z
            ''設定旋轉的原點
            btn.RenderTransformOrigin = New Point(0, 0)
            ''設定旋轉的角度
            btn.RenderTransform = New RotateTransform(z * 36)
            btn.Content = "Button" & z & " Rotate=" & Format(z * 36, "000")
            btn.Background = Brushes.LightPink
            Canvas.SetLeft(btn, 150)
            Canvas.SetTop(btn, 150)
            cv.Children.Add(btn)
        Next

        btnOther.Name = "btnOther"
        ''矩形左上
        btnOther.RenderTransformOrigin = New Point(0, 0)
        ''矩形左下
        'btnOther.RenderTransformOrigin = New Point(0, 1)
        ''矩形右上
        'btnOther.RenderTransformOrigin = New Point(1, 0)
        ''矩形右下
        'btnOther.RenderTransformOrigin = New Point(1, 1)
        ''中心點
        'btnOther.RenderTransformOrigin = New Point(0.5, 0.5)
        btnOther.Background = Brushes.LightGreen
        Canvas.SetLeft(btnOther, 300)
        Canvas.SetTop(btnOther, 150)
        cv.Children.Add(btnOther)

        ''Timer相關設定  
        myT = New Threading.DispatcherTimer
        myT.Interval = New TimeSpan(0, 0, 0, 0, 300)
        AddHandler myT.Tick, AddressOf Timer_Tick
        myT.Start()
    End Sub

    Private Sub Timer_Tick(ByVal sender As Object, ByVal e As EventArgs)
        If rotatePoint > 9 Then
            rotatePoint = 0
        Else
            rotatePoint += 1
        End If
        btnOther.RenderTransform = New RotateTransform(rotatePoint * 36)
        btnOther.Content = "btnOther Rotate=" & Format(rotatePoint * 36, "000")
    End Sub
End Class

註解掉的地方可以自行測試看看當變更原點的時候有什麼不同的變化，不過一個會轉的Button，使用者應該會"幹譙"吧..XD