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StreamGeometryContext.LineTo(Point, Boolean, Boolean) Méthode

  • Référence

Définition

Espace de noms:
System.Windows.Media
Assembly:
PresentationCore.dll

Dessine une ligne droite au Pointspécifié.

public:
 abstract void LineTo(System::Windows::Point point, bool isStroked, bool isSmoothJoin);
public abstract void LineTo (System.Windows.Point point, bool isStroked, bool isSmoothJoin);
abstract member LineTo : System.Windows.Point * bool * bool -> unit
Public MustOverride Sub LineTo (point As Point, isStroked As Boolean, isSmoothJoin As Boolean)

Paramètres

point
Point

Point de destination pour la fin de la ligne.

isStroked
Boolean

true pour rayer le segment quand un Pen est utilisé pour restituer le segment ; sinon, false.

isSmoothJoin
Boolean

true pour traiter la jointure entre ce segment et le segment précédent comme un coin lorsqu'il est rayé d'un Pen ; sinon, false.

Exceptions

InvalidOperationException

Une tentative a été effectuée pour ajouter un segment sans commencer une figure en appelant la méthode BeginFigure(Point, Boolean, Boolean).

Exemples

L’exemple suivant montre comment dessiner un triangle à l’aide de la LineTo méthode.

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

namespace SDKSample
{
    // Use StreamGeometry with StreamGeometryContext to define a triangle shape.
    public partial class StreamGeometryTriangleExample : Page
    {
        public StreamGeometryTriangleExample()
        {
            // 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())
            {
                
                // Begin the triangle at the point specified. Notice that the shape is set to 
                // be closed so only two lines need to be specified below to make the triangle.
                ctx.BeginFigure(new Point(10, 100), true /* is filled */, true /* is closed */);

                // Draw a line to the next specified point.
                ctx.LineTo(new Point(100, 100), true /* is stroked */, false /* is smooth join */);

                // Draw another line to the next specified point.
                ctx.LineTo(new Point(100, 50), 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

Namespace SDKSample
    ' Use StreamGeometry with StreamGeometryContext to define a triangle shape.
    Partial Public Class StreamGeometryTriangleExample
        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()

                ' Begin the triangle at the point specified. Notice that the shape is set to 
                ' be closed so only two lines need to be specified below to make the triangle.
                ctx.BeginFigure(New Point(10, 100), True, True) ' is closed  -  is filled 

                ' Draw a line to the next specified point.
                ctx.LineTo(New Point(100, 100), True, False) ' is smooth join  -  is stroked 

                ' Draw another line to the next specified point.
                ctx.LineTo(New Point(100, 50), 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

Remarques

Cette méthode utilise le point de terminaison du segment précédent comme point de départ. S’il s’agit du premier segment d’une figure, il utilise le point spécifié par la BeginFigure méthode comme point de départ.

Impossible StreamGeometry de sérialiser s’il contient un Transform ou n’importe quel segment non trait ou non rempli.

S’applique à

Voir aussi