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StreamGeometryContext.PolyQuadraticBezierTo Método

Definición

Dibuja una o varias curvas Bézier cuadráticas conectadas.

public:
 abstract void PolyQuadraticBezierTo(System::Collections::Generic::IList<System::Windows::Point> ^ points, bool isStroked, bool isSmoothJoin);
public abstract void PolyQuadraticBezierTo (System.Collections.Generic.IList<System.Windows.Point> points, bool isStroked, bool isSmoothJoin);
abstract member PolyQuadraticBezierTo : System.Collections.Generic.IList<System.Windows.Point> * bool * bool -> unit
Public MustOverride Sub PolyQuadraticBezierTo (points As IList(Of Point), isStroked As Boolean, isSmoothJoin As Boolean)

Parámetros

points
IList<Point>

Colección de puntos que especifican los puntos de control y de destino de una o varias curvas Bézier cuadráticas. El primer punto de la lista especifica el punto de control de la curva, el segundo punto especifica el punto de destino, el tercer punto especifica el punto de control de la siguiente curva, etc. La lista debe contener un número par de puntos.

isStroked
Boolean

Es true para que se trace el segmento cuando se utilice Pen para representarlo; en caso contrario, es false.

isSmoothJoin
Boolean

Es true para tratar la unión entre este segmento y el anterior como un ángulo cuando se trace con Pen; en caso contrario, es false.

Excepciones

Se ha intentado agregar un segmento sin iniciar una figura con una llamada al método BeginFigure(Point, Boolean, Boolean).

Ejemplos

En el ejemplo siguiente se muestra cómo dibujar varias curvas Bezier cuadráticas conectadas mediante el PolyQuadraticBezierTo método .

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

namespace SDKSample
{
    public partial class StreamGeometryPolyQuadraticBezierToExample : Page
    {
        public StreamGeometryPolyQuadraticBezierToExample()
        {
            // 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();
            geometry.FillRule = FillRule.EvenOdd;

            // 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 collection of Point structures that will be used with the PolyQuadraticBezierTo 
                // Method to create two quadratic Bezier curves.
                List<Point> pointList = new List<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 /* is stroked */, false /* is smooth join */);
            }

            // 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.
            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
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

Comentarios

Este método usa el punto final del segmento anterior como punto de partida. Si este es el primer segmento de una figura, usa el punto especificado por el BeginFigure método como punto de inicio.

No StreamGeometry se puede serializar si contiene o Transform cualquier segmento no rellenado o sin trazos.

Se aplica a

Consulte también