StreamGeometryContext.BezierTo(Point, Point, Point, Boolean, Boolean) 方法

  • 参考

定义

命名空间:
System.Windows.Media
程序集:
PresentationCore.dll

绘制一条到指定点的贝塞尔曲线。

public:
 abstract void BezierTo(System::Windows::Point point1, System::Windows::Point point2, System::Windows::Point point3, bool isStroked, bool isSmoothJoin);
public abstract void BezierTo (System.Windows.Point point1, System.Windows.Point point2, System.Windows.Point point3, bool isStroked, bool isSmoothJoin);
abstract member BezierTo : System.Windows.Point * System.Windows.Point * System.Windows.Point * bool * bool -> unit
Public MustOverride Sub BezierTo (point1 As Point, point2 As Point, point3 As Point, isStroked As Boolean, isSmoothJoin As Boolean)

参数

point1
Point

用于指定曲线形状的第一个控制点。

point2
Point

用于指定曲线形状的第二个控制点。

point3
Point

曲线末尾的目标点。

isStroked
Boolean

若要在使用 Pen 呈现线段时使线段描边，则为 true；否则为 false。

isSmoothJoin
Boolean

在用 Pen 描边时，如果要将此线段与前一条线段之间的联接视为角，则为 true；否则为 false。

例外

InvalidOperationException

试图添加一条线段，但未通过调用 BeginFigure(Point, Boolean, Boolean) 方法来指定图形的起点。

示例

下面的示例演示如何使用 BezierTo 该方法绘制 Bezier 曲线。

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

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

            // 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 Bezier curve using the 3 specifed points where the first two points
                // are control points and the last point is the destination point for the curve.
                ctx.BezierTo(new Point(100, 0), new Point(200,200), new Point(300,100), 
                             true /* is stroked */, false /* is smooth join */);
            }

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

            // Freeze the geometry (make it unmodifiable)
            // for additional performance benefits.
            geometry.Freeze();

            // specify the shape (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 StreamGeometryBezierToExample
        Inherits Page
        Public Sub New()

            ' 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 Bezier curve using the 3 specifed points where the first two points
                ' are control points and the last point is the destination point for the curve.
                ctx.BezierTo(New Point(100, 0), New Point(200,200), New Point(300,100), True, False) ' is smooth join  -  is stroked 

            End Using

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

            ' Freeze the geometry (make it unmodifiable)
            ' for additional performance benefits.
            geometry.Freeze()

            ' specify the shape (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

注解

立方贝塞尔曲线由起点、终点和两个控制点定义。 第一个控制点确定段上半部分的曲率，第二个控制点确定段下半部分的曲率。

此方法使用上一段的终点作为起点。 如果这是图中的第一段，则使用方法指定的 BeginFigure 点作为起点。

如果它包含非Transform笔划或未填充段，则无法序列化 AStreamGeometry。

适用于

另请参阅