StreamGeometryContext.QuadraticBezierTo Method
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Draws a quadratic Bezier curve.
public:
abstract void QuadraticBezierTo(System::Windows::Point point1, System::Windows::Point point2, bool isStroked, bool isSmoothJoin);
public abstract void QuadraticBezierTo (System.Windows.Point point1, System.Windows.Point point2, bool isStroked, bool isSmoothJoin);
abstract member QuadraticBezierTo : System.Windows.Point * System.Windows.Point * bool * bool -> unit
Public MustOverride Sub QuadraticBezierTo (point1 As Point, point2 As Point, isStroked As Boolean, isSmoothJoin As Boolean)
- point1
- Point
The control point used to specify the shape of the curve.
- point2
- Point
The destination point for the end of the curve.
- isStroked
- Boolean
true
to make the segment stroked when a Pen is used to render the segment; otherwise, false
.
- isSmoothJoin
- Boolean
true
to treat the join between this segment and the previous segment as a corner when stroked with a Pen; otherwise, false
.
An attempt was made to add a segment without starting a figure by calling the BeginFigure(Point, Boolean, Boolean) method.
The following example shows how to draw a quadratic Bezier curve using the QuadraticBezierTo method.
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Shapes;
namespace SDKSample
{
public partial class StreamGeometryQuadraticBezierToExample : Page
{
public StreamGeometryQuadraticBezierToExample()
{
// 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())
{
// Set the begin point of the shape.
ctx.BeginFigure(new Point(10, 100), true /* is filled */, false /* is closed */);
// Create a Quadratic Bezier curve using the 2 specifed points. The first point
// specifies the control point while the second point specifies the end point
// of the curve.
ctx.QuadraticBezierTo(new Point(100, 0), new Point(200, 200), true /* is stroked */,
false /* is smooth join */);
}
// Freeze the geometry (make it unmodifiable)
// for additional performance benefits.
geometry.Freeze();
// specify the shape (quadratic 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 StreamGeometryQuadraticBezierToExample
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()
' Set the begin point of the shape.
ctx.BeginFigure(New Point(10, 100), True, False) ' is closed - is filled
' Create a Quadratic Bezier curve using the 2 specifed points. The first point
' specifies the control point while the second point specifies the end point
' of the curve.
ctx.QuadraticBezierTo(New Point(100, 0), New Point(200, 200), 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 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
Unlike a cubic Bezier curve, which uses two control points, a quadratic cubic Bezier curve uses a single control point.
This method uses the end point of the previous segment as its starting point. If this is the first segment in a figure, it uses the point specified by the BeginFigure method as its start point.
A StreamGeometry cannot be serialized if it contains a Transform or any non-stroked or unfilled segments.
Προϊόν | Εκδόσεις |
---|---|
.NET Framework | 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
Windows Desktop | 3.0, 3.1, 5, 6, 7, 8, 9 |
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