VB.NET StreamGeometryContext.PolyQuadraticBezierTo方法代碼示例

' 導入命名空間
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Media
Imports System.Windows.Shapes
Imports System.Collections.Generic

Namespace SDKSample
    Partial Public Class StreamGeometryPolyQuadraticBezierToExample
        Inherits Page
        Public Sub New()
            ' Create a path to draw a geometry with.
            Dim myPath As New Path()
            myPath.Stroke = Brushes.Black
            myPath.StrokeThickness = 1

            ' Create a StreamGeometry to use to specify myPath.
            Dim geometry As New StreamGeometry()
            geometry.FillRule = FillRule.EvenOdd

            ' Open a StreamGeometryContext that can be used to describe this StreamGeometry object's contents. 
            Using ctx As StreamGeometryContext = geometry.Open()
                ' Set the begin point of the shape.
                ctx.BeginFigure(New Point(10, 100), True, False) ' is closed  -  is filled 

                ' Create a collection of Point structures that will be used with the PolyQuadraticBezierTo 
                ' Method to create two quadratic Bezier curves.
                Dim pointList As New List(Of Point)()

                ' First quadratic Bezier curve is specified with these two points.

                ' Control point for first quadratic Bezier curve.
                pointList.Add(New Point(100, 0))

                ' End point for first quadratic Bezier curve.
                pointList.Add(New Point(200, 200))

                ' Second quadratic Bezier curve is specified with these two points.

                ' Control point for second quadratic Bezier curve.
                pointList.Add(New Point(300, 300))

                ' End point for second quadratic Bezier curve.
                pointList.Add(New Point(400, 100))

                ' Create a Bezier curve using the collection of Point Structures.
                ctx.PolyQuadraticBezierTo(pointList, True, False) ' is smooth join  -  is stroked 

            End Using

            ' Freeze the geometry (make it unmodifiable)
            ' for additional performance benefits.
            geometry.Freeze()

            ' specify the shape (quadratic Benzier curve) of the path using the StreamGeometry.
            myPath.Data = geometry

            ' Add path shape to the UI.
            Dim mainPanel As New StackPanel()
            mainPanel.Children.Add(myPath)
            Me.Content = mainPanel
        End Sub
    End Class
End Namespace