本文整理汇总了VB.NET中System.Windows.Media.DrawingContext.PushOpacity方法的典型用法代码示例。如果您正苦于以下问题：VB.NET DrawingContext.PushOpacity方法的具体用法？VB.NET DrawingContext.PushOpacity怎么用？VB.NET DrawingContext.PushOpacity使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类System.Windows.Media.DrawingContext的用法示例。
在下文中一共展示了DrawingContext.PushOpacity方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: New
' 导入命名空间
Imports System.Windows.Media.Animation
Imports System.Windows.Media.Effects
Namespace SDKSample
Public Class PushEffectExample
Inherits Page
Public Sub New()
Dim shapeOutlinePen As New Pen(Brushes.Black, 2)
shapeOutlinePen.Freeze()
' Create a DrawingGroup
Dim dGroup As New DrawingGroup()
' Obtain a DrawingContext from
' the DrawingGroup.
Using dc As DrawingContext = dGroup.Open()
' Draw a rectangle at full opacity.
dc.DrawRectangle(Brushes.Blue, shapeOutlinePen, New Rect(0, 0, 25, 25))
' Push an opacity change of 0.5.
' The opacity of each subsequent drawing will
' will be multiplied by 0.5.
dc.PushOpacity(0.5)
' This rectangle is drawn at 50% opacity.
dc.DrawRectangle(Brushes.Blue, shapeOutlinePen, New Rect(25, 25, 25, 25))
' Blurs subsquent drawings.
dc.PushEffect(New BlurBitmapEffect(), Nothing)
' This rectangle is blurred and drawn at 50% opacity (0.5 x 0.5).
dc.DrawRectangle(Brushes.Blue, shapeOutlinePen, New Rect(50, 50, 25, 25))
' This rectangle is also blurred and drawn at 50% opacity.
dc.DrawRectangle(Brushes.Blue, shapeOutlinePen, New Rect(75, 75, 25, 25))
' Stop applying the blur to subsquent drawings.
dc.Pop()
' This rectangle is drawn at 50% opacity with no blur effect.
dc.DrawRectangle(Brushes.Blue, shapeOutlinePen, New Rect(100, 100, 25, 25))
End Using
' Display the drawing using an image control.
Dim theImage As New Image()
Dim dImageSource As New DrawingImage(dGroup)
theImage.Source = dImageSource
Me.Content = theImage
End Sub
End Class
End Namespace