StreamGeometryContext.PolyLineTo(IList<Point>, Boolean, Boolean) Método

  • Referência

Definição

Namespace:
System.Windows.Media
Assembly:
PresentationCore.dll

Desenha uma ou mais linhas retas conectadas.

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

Parâmetros

points
IList<Point>

A coleção de pontos que especificam os pontos de destino para uma ou mais linhas retas conectadas.

isStroked
Boolean

true para deixar o segmento tracejado quando uma Pen for usada para renderizar o segmento, caso contrário, false.

isSmoothJoin
Boolean

true para tratar a junção entre esse segmento e o segmento anterior como um canto quando traçados com um Pen; caso contrário, false.

Exceções

InvalidOperationException

Foi feita uma tentativa para adicionar um segmento sem iniciar uma figura ao chamar o método BeginFigure(Point, Boolean, Boolean).

Exemplos

O exemplo a seguir mostra como desenhar um triângulo usando o PolyLineTo 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 StreamGeometryPolyLineToExample : Page
    {
        public StreamGeometryPolyLineToExample()
        {
            // 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())
            {
                // Begin the triangle at the point specified.
                ctx.BeginFigure(new Point(10, 100), true /* is filled */, true /* is closed */);

                // Create a collection of Point structures that will be used with the PolyLineTo 
                // Method to create a triangle.
                List<Point> pointList = new List<Point>();

                // Two Points are added to the collection. The PolyLineTo method will draw lines
                // between the Points of the collection.
                pointList.Add(new Point(100, 100));
                pointList.Add(new Point(100, 50));

                // Create a triangle using the collection of Point Structures.
                ctx.PolyLineTo(pointList, true /* is stroked */, false /* is smooth join */);
            }

            // Freeze the geometry (make it unmodifiable)
            // for additional performance benefits.
            geometry.Freeze();
            
            // specify the shape (triangle) 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 StreamGeometryPolyLineToExample
        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()
                ' Begin the triangle at the point specified.
                ctx.BeginFigure(New Point(10, 100), True, True) ' is closed  -  is filled 

                ' Create a collection of Point structures that will be used with the PolyLineTo 
                ' Method to create a triangle.
                Dim pointList As New List(Of Point)()

                ' Two Points are added to the collection. The PolyLineTo method will draw lines
                ' between the Points of the collection.
                pointList.Add(New Point(100, 100))
                pointList.Add(New Point(100, 50))

                ' Create a triangle using the collection of Point Structures.
                ctx.PolyLineTo(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 (triangle) 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

Comentários

Esse método usa o ponto de extremidade do segmento anterior como ponto de partida. Se esse for o primeiro segmento em uma figura, ele usará o ponto especificado pelo BeginFigure método como seu ponto inicial.

Um StreamGeometry não poderá ser serializado se contiver um Transform ou qualquer segmento não acarinhado ou não preenchido.

Aplica-se a

Confira também