StreamGeometryContext.QuadraticBezierTo Methode

public:
 abstract void QuadraticBezierTo(System::Windows::Point point1, System::Windows::Point point2, bool isStroked, bool isSmoothJoin);

public abstract void QuadraticBezierTo(System.Windows.Point point1, System.Windows.Point point2, bool isStroked, bool isSmoothJoin);

abstract member QuadraticBezierTo : System.Windows.Point * System.Windows.Point * bool * bool -> unit

Public MustOverride Sub QuadraticBezierTo (point1 As Point, point2 As Point, isStroked As Boolean, isSmoothJoin As Boolean)

Parameter

Ausnahmen

Beispiele

Das folgende Beispiel zeigt, wie sie mithilfe der QuadraticBezierTo Methode eine quadratische Bézierkurve zeichnen.

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Shapes;

namespace SDKSample
{
    public partial class StreamGeometryQuadraticBezierToExample : Page
    {
        public StreamGeometryQuadraticBezierToExample()
        {
            // Create a path to draw a geometry with.
            Path myPath = new Path();
            myPath.Stroke = Brushes.Black;
            myPath.StrokeThickness = 1;

            // Create a StreamGeometry to use to specify myPath.
            StreamGeometry geometry = new StreamGeometry();

            // Open a StreamGeometryContext that can be used to describe this StreamGeometry 
            // object's contents.
            using (StreamGeometryContext ctx = geometry.Open())
            {
                // Set the begin point of the shape.
                ctx.BeginFigure(new Point(10, 100), true /* is filled */, false /* is closed */);

                // Create a Quadratic Bezier curve using the 2 specifed points. The first point
                // specifies the control point while the second point specifies the end point 
                // of the curve.
                ctx.QuadraticBezierTo(new Point(100, 0), new Point(200, 200), true /* is stroked */, 
                                      false /* is smooth join */);
            }

            // Freeze the geometry (make it unmodifiable)
            // for additional performance benefits.
            geometry.Freeze();
            
            // specify the shape (quadratic Bezier curve) of the path using the StreamGeometry.
            myPath.Data = geometry;

            // Add path shape to the UI.
            StackPanel mainPanel = new StackPanel();
            mainPanel.Children.Add(myPath);
            this.Content = mainPanel;
        }
    }
}

Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Media
Imports System.Windows.Shapes

Namespace SDKSample
    Partial Public Class StreamGeometryQuadraticBezierToExample
        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()

            ' 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 Quadratic Bezier curve using the 2 specifed points. The first point
                ' specifies the control point while the second point specifies the end point 
                ' of the curve.
                ctx.QuadraticBezierTo(New Point(100, 0), New Point(200, 200), 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 Bezier 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

Hinweise

Im Gegensatz zu einer kubischen Bézierkurve, die zwei Kontrollpunkte verwendet, verwendet eine quadratische kubische Bézierkurve einen einzigen Kontrollpunkt.

Diese Methode verwendet den Endpunkt des vorherigen Abschnitts als Ausgangspunkt. Wenn dies das erste Segment in einer Abbildung ist, wird der durch die BeginFigure Methode angegebene Punkt als Ausgangspunkt verwendet.

A StreamGeometry kann nicht serialisiert werden, wenn sie ein Transform oder nicht strich- oder nicht ausgefüllte Segmente enthält.

Weitere Informationen

• ArcTo(Point, Size, Double, Boolean, SweepDirection, Boolean, Boolean)
• BezierTo(Point, Point, Point, Boolean, Boolean)
• PolyBezierTo(IList<Point>, Boolean, Boolean)
• PolyQuadraticBezierTo(IList<Point>, Boolean, Boolean)