PolyBezierSegment Clase

Definición

public ref class PolyBezierSegment sealed : System::Windows::Media::PathSegment

public sealed class PolyBezierSegment : System.Windows.Media.PathSegment

type PolyBezierSegment = class
    inherit PathSegment

Public NotInheritable Class PolyBezierSegment
Inherits PathSegment

Herencia

Object

DispatcherObject

DependencyObject

Freezable

Animatable

PathSegment

PolyBezierSegment

Ejemplos

En el ejemplo siguiente se muestra cómo usar para PolyBezierSegment dibujar dos curvas bézier cúbicas.

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <StackPanel>
    <Canvas>
      <Path Stroke="Black" StrokeThickness="1">
        <Path.Data>
          <PathGeometry>
            <PathGeometry.Figures>
              <PathFigureCollection>

                <!-- The StartPoint specifies the starting point of the first curve. -->
                <PathFigure StartPoint="10,100">
                  <PathFigure.Segments>
                    <PathSegmentCollection>

                      <!-- The PolyBezierSegment specifies two cubic Bezier curves.
                           The first curve is from 10,100 (start point specified above)
                           to 300,100 with a control point of 0,0 and another control
                           point of 200,0. The second curve is from 300,100 
                           (end of the last curve) to 600,100 with a control point of 300,0
                           and another control point of 400,0. -->
                      <PolyBezierSegment Points="0,0 200,0 300,100 300,0 400,0 600,100" />
                    </PathSegmentCollection>
                  </PathFigure.Segments>
                </PathFigure>
              </PathFigureCollection>
            </PathGeometry.Figures>
          </PathGeometry>
        </Path.Data>
      </Path>
    </Canvas>
  </StackPanel>
</Page>

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

namespace SDKSample
{
    public partial class PolyBezierSegmentExample : Page
    {
        public PolyBezierSegmentExample()
        {

            // Create a PathFigure to be used for the PathGeometry of myPath.
            PathFigure myPathFigure = new PathFigure();

            // Set the starting point for the PathFigure specifying that the
            // geometry starts at point 10,100.
            myPathFigure.StartPoint = new Point(10, 100);

            // Create a PointCollection that holds the Points used to specify 
            // the points of the PolyBezierSegment below.
            PointCollection myPointCollection = new PointCollection(6);
            myPointCollection.Add(new Point(0, 0));
            myPointCollection.Add(new Point(200, 0));
            myPointCollection.Add(new Point(300, 100));
            myPointCollection.Add(new Point(300, 0));
            myPointCollection.Add(new Point(400, 0));
            myPointCollection.Add(new Point(600, 100));

            // The PolyBezierSegment specifies two cubic Bezier curves.
            // The first curve is from 10,100 (start point specified by the PathFigure)
            // to 300,100 with a control point of 0,0 and another control point 
            // of 200,0. The second curve is from 300,100 (end of the last curve) to 
            // 600,100 with a control point of 300,0 and another control point of 400,0.
            PolyBezierSegment myBezierSegment = new PolyBezierSegment();
            myBezierSegment.Points = myPointCollection;

            PathSegmentCollection myPathSegmentCollection = new PathSegmentCollection();
            myPathSegmentCollection.Add(myBezierSegment);

            myPathFigure.Segments = myPathSegmentCollection;

            PathFigureCollection myPathFigureCollection = new PathFigureCollection();
            myPathFigureCollection.Add(myPathFigure);

            PathGeometry myPathGeometry = new PathGeometry();
            myPathGeometry.Figures = myPathFigureCollection;

            // Create a path to draw a geometry with.
            Path myPath = new Path();
            myPath.Stroke = Brushes.Black;
            myPath.StrokeThickness = 1;

            // specify the shape (quadratic Bezier curve) of the path using the StreamGeometry.
            myPath.Data = myPathGeometry;

            // 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 PolyBezierSegmentExample
        Inherits Page
        Public Sub New()

            ' Create a PathFigure to be used for the PathGeometry of myPath.
            Dim myPathFigure As New PathFigure()

            ' Set the starting point for the PathFigure specifying that the
            ' geometry starts at point 10,100.
            myPathFigure.StartPoint = New Point(10, 100)

            ' Create a PointCollection that holds the Points used to specify 
            ' the points of the PolyBezierSegment below.
            Dim myPointCollection As New PointCollection(6)
            myPointCollection.Add(New Point(0, 0))
            myPointCollection.Add(New Point(200, 0))
            myPointCollection.Add(New Point(300, 100))
            myPointCollection.Add(New Point(300, 0))
            myPointCollection.Add(New Point(400, 0))
            myPointCollection.Add(New Point(600, 100))

            ' The PolyBezierSegment specifies two cubic Bezier curves.
            ' The first curve is from 10,100 (start point specified by the PathFigure)
            ' to 300,100 with a control point of 0,0 and another control point 
            ' of 200,0. The second curve is from 300,100 (end of the last curve) to 
            ' 600,100 with a control point of 300,0 and another control point of 400,0.
            Dim myBezierSegment As New PolyBezierSegment()
            myBezierSegment.Points = myPointCollection

            Dim myPathSegmentCollection As New PathSegmentCollection()
            myPathSegmentCollection.Add(myBezierSegment)

            myPathFigure.Segments = myPathSegmentCollection

            Dim myPathFigureCollection As New PathFigureCollection()
            myPathFigureCollection.Add(myPathFigure)

            Dim myPathGeometry As New PathGeometry()
            myPathGeometry.Figures = myPathFigureCollection

            ' Create a path to draw a geometry with.
            Dim myPath As New Path()
            myPath.Stroke = Brushes.Black
            myPath.StrokeThickness = 1

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

            ' 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

Use un PathFigure objeto para almacenar PolyBezierSegment objetos y otros segmentos.

Una curva Bezier cúbica se define en cuatro puntos: un punto inicial, un punto final y dos puntos de control. Un PolyBezierSegment especifica una o varias curvas bezier cúbicas estableciendo la Points propiedad en una colección de puntos. Para cada tres puntos de la colección, los puntos primero y segundo especifican los dos puntos de control de la curva y el tercer punto especifica el punto final. Tenga en cuenta que no se especifica ningún punto de inicio para la curva porque el punto inicial es el mismo que el punto final del último segmento.

Los dos puntos de control de una curva Bezier cúbica se comportan como imanes, atrayendo partes de lo que, de lo contrario, sería una línea recta hacia sí mismos y produciendo una curva. El primer punto de control afecta a la parte inicial de la curva; el segundo punto de control afecta a la parte final de la curva. Tenga en cuenta que la curva no pasa necesariamente por ninguno de los puntos de control; cada punto de control mueve su parte de la línea hacia sí misma, pero no a través de sí mismo.

Constructores

Campos

Propiedades

Métodos

Eventos

Se aplica a

Consulte también

• BezierSegment