# Graphics.DrawBezier 方法

## 重载

 DrawBezier(Pen, Point, Point, Point, Point) 绘制由 4 个 Point 结构定义的贝塞尔样条。Draws a Bézier spline defined by four Point structures. DrawBezier(Pen, PointF, PointF, PointF, PointF) 绘制由 4 个 PointF 结构定义的贝塞尔样条。Draws a Bézier spline defined by four PointF structures. DrawBezier(Pen, Single, Single, Single, Single, Single, Single, Single, Single) 绘制由四个表示点的有序坐标对定义的贝塞尔样条。Draws a Bézier spline defined by four ordered pairs of coordinates that represent points.

## DrawBezier(Pen, Point, Point, Point, Point)

public:
void DrawBezier(System::Drawing::Pen ^ pen, System::Drawing::Point pt1, System::Drawing::Point pt2, System::Drawing::Point pt3, System::Drawing::Point pt4);
public void DrawBezier (System.Drawing.Pen pen, System.Drawing.Point pt1, System.Drawing.Point pt2, System.Drawing.Point pt3, System.Drawing.Point pt4);
member this.DrawBezier : System.Drawing.Pen * System.Drawing.Point * System.Drawing.Point * System.Drawing.Point * System.Drawing.Point -> unit
Public Sub DrawBezier (pen As Pen, pt1 As Point, pt2 As Point, pt3 As Point, pt4 As Point)

#### 参数

pen
Pen

Pen 结构，它确定曲线的颜色、宽度和样式。Pen structure that determines the color, width, and style of the curve.

pt1
Point

Point 结构，它表示曲线的起始点。Point structure that represents the starting point of the curve.

pt2
Point

Point 结构，它表示曲线的第一个控制点。Point structure that represents the first control point for the curve.

pt3
Point

Point 结构，它表示曲线的第二个控制点。Point structure that represents the second control point for the curve.

pt4
Point

Point 结构，它表示曲线的结束点。Point structure that represents the ending point of the curve.

#### 例外

pennullpen is null.

### 示例

• 创建黑色笔。Creates a black pen.

• 为曲线创建起始、结束和两个控制点。Creates the start, end, and two control points for the curve.

• 将 Bezier 曲线绘制到屏幕上。Draws the Bézier curve to the screen.

private:
void DrawBezierPoint( PaintEventArgs^ e )
{
// Create pen.
Pen^ blackPen = gcnew Pen( Color::Black,3.0f );

// Create points for curve.
Point start = Point(100,100);
Point control1 = Point(200,10);
Point control2 = Point(350,50);
Point end = Point(500,100);

// Draw arc to screen.
e->Graphics->DrawBezier( blackPen, start, control1, control2, end );
}
private void DrawBezierPoint(PaintEventArgs e)
{
// Create pen.
Pen blackPen = new Pen(Color.Black, 3);

// Create points for curve.
Point start = new Point(100, 100);
Point control1 = new Point(200, 10);
Point control2 = new Point(350, 50);
Point end = new Point(500, 100);

// Draw arc to screen.
e.Graphics.DrawBezier(blackPen, start, control1, control2, end);
}
Private Sub DrawBezierPoint(ByVal e As PaintEventArgs)

' Create pen.
Dim blackPen As New Pen(Color.Black, 3)

' Create points for curve.
Dim start As New Point(100, 100)
Dim control1 As New Point(200, 10)
Dim control2 As New Point(350, 50)
Dim [end] As New Point(500, 100)

' Draw arc to screen.
e.Graphics.DrawBezier(blackPen, start, control1, control2, [end])
End Sub

## DrawBezier(Pen, PointF, PointF, PointF, PointF)

public:
void DrawBezier(System::Drawing::Pen ^ pen, System::Drawing::PointF pt1, System::Drawing::PointF pt2, System::Drawing::PointF pt3, System::Drawing::PointF pt4);
public void DrawBezier (System.Drawing.Pen pen, System.Drawing.PointF pt1, System.Drawing.PointF pt2, System.Drawing.PointF pt3, System.Drawing.PointF pt4);
member this.DrawBezier : System.Drawing.Pen * System.Drawing.PointF * System.Drawing.PointF * System.Drawing.PointF * System.Drawing.PointF -> unit
Public Sub DrawBezier (pen As Pen, pt1 As PointF, pt2 As PointF, pt3 As PointF, pt4 As PointF)

#### 参数

pen
Pen

Pen，它确定曲线的颜色、宽度和样式。Pen that determines the color, width, and style of the curve.

pt1
PointF

PointF 结构，它表示曲线的起始点。PointF structure that represents the starting point of the curve.

pt2
PointF

PointF 结构，它表示曲线的第一个控制点。PointF structure that represents the first control point for the curve.

pt3
PointF

PointF 结构，它表示曲线的第二个控制点。PointF structure that represents the second control point for the curve.

pt4
PointF

PointF 结构，它表示曲线的结束点。PointF structure that represents the ending point of the curve.

#### 例外

pennullpen is null.

### 示例

• 创建黑色笔。Creates a black pen.

• 为曲线创建起始、结束和两个控制点。Creates the start, end, and two control points for the curve.

• 将 Bezier 曲线绘制到屏幕上。Draws the Bézier curve to the screen.

private:
void DrawBezierPointF( PaintEventArgs^ e )
{
// Create pen.
Pen^ blackPen = gcnew Pen( Color::Black,3.0f );

// Create points for curve.
PointF start = PointF(100.0F,100.0F);
PointF control1 = PointF(200.0F,10.0F);
PointF control2 = PointF(350.0F,50.0F);
PointF end = PointF(500.0F,100.0F);

// Draw arc to screen.
e->Graphics->DrawBezier( blackPen, start, control1, control2, end );
}
private void DrawBezierPointF(PaintEventArgs e)
{
// Create pen.
Pen blackPen = new Pen(Color.Black, 3);

// Create points for curve.
PointF start = new PointF(100.0F, 100.0F);
PointF control1 = new PointF(200.0F, 10.0F);
PointF control2 = new PointF(350.0F, 50.0F);
PointF end = new PointF(500.0F, 100.0F);

// Draw arc to screen.
e.Graphics.DrawBezier(blackPen, start, control1, control2, end);
}
Private Sub DrawBezierPointF(ByVal e As PaintEventArgs)

' Create pen.
Dim blackPen As New Pen(Color.Black, 3)

' Create points for curve.
Dim start As New PointF(100.0F, 100.0F)
Dim control1 As New PointF(200.0F, 10.0F)
Dim control2 As New PointF(350.0F, 50.0F)
Dim [end] As New PointF(500.0F, 100.0F)

' Draw arc to screen.
e.Graphics.DrawBezier(blackPen, start, control1, control2, [end])
End Sub

## DrawBezier(Pen, Single, Single, Single, Single, Single, Single, Single, Single)

public:
void DrawBezier(System::Drawing::Pen ^ pen, float x1, float y1, float x2, float y2, float x3, float y3, float x4, float y4);
public void DrawBezier (System.Drawing.Pen pen, float x1, float y1, float x2, float y2, float x3, float y3, float x4, float y4);
member this.DrawBezier : System.Drawing.Pen * single * single * single * single * single * single * single * single -> unit
Public Sub DrawBezier (pen As Pen, x1 As Single, y1 As Single, x2 As Single, y2 As Single, x3 As Single, y3 As Single, x4 As Single, y4 As Single)

#### 参数

pen
Pen

Pen，它确定曲线的颜色、宽度和样式。Pen that determines the color, width, and style of the curve.

x1
Single

y1
Single

x2
Single

y2
Single

x3
Single

y3
Single

x4
Single

y4
Single

#### 例外

pennullpen is null.

### 示例

• 创建黑色笔。Creates a black pen.

• 为曲线创建起始、结束和两个控制点的坐标。Creates the coordinates of the start, end, and two control points for the curve.

• 将 Bezier 曲线绘制到屏幕上。Draws the Bézier curve to the screen.

private:
void DrawBezierFloat( PaintEventArgs^ e )
{
// Create pen.
Pen^ blackPen = gcnew Pen( Color::Black,3.0f );

// Create coordinates of points for curve.
float startX = 100.0F;
float startY = 100.0F;
float controlX1 = 200.0F;
float controlY1 = 10.0F;
float controlX2 = 350.0F;
float controlY2 = 50.0F;
float endX = 500.0F;
float endY = 100.0F;

// Draw arc to screen.
e->Graphics->DrawBezier( blackPen, startX, startY, controlX1, controlY1, controlX2, controlY2, endX, endY );
}
private void DrawBezierFloat(PaintEventArgs e)
{
// Create pen.
Pen blackPen = new Pen(Color.Black, 3);

// Create coordinates of points for curve.
float startX = 100.0F;
float startY = 100.0F;
float controlX1 = 200.0F;
float controlY1 =  10.0F;
float controlX2 = 350.0F;
float controlY2 =  50.0F;
float endX = 500.0F;
float endY = 100.0F;

// Draw arc to screen.
e.Graphics.DrawBezier(blackPen, startX, startY,
controlX1, controlY1,
controlX2, controlY2,
endX, endY);
}

' Begin Example03.
Private Sub DrawBezierFloat(ByVal e As PaintEventArgs)

' Create pen.
Dim blackPen As New Pen(Color.Black, 3)

' Create coordinates of points for curve.
Dim startX As Single = 100.0F
Dim startY As Single = 100.0F
Dim controlX1 As Single = 200.0F
Dim controlY1 As Single = 10.0F
Dim controlX2 As Single = 350.0F
Dim controlY2 As Single = 50.0F
Dim endX As Single = 500.0F
Dim endY As Single = 100.0F

' Draw arc to screen.
e.Graphics.DrawBezier(blackPen, startX, startY, controlX1, _
controlY1, controlX2, controlY2, endX, endY)
End Sub