RectangleF 构造函数

定义

命名空间:

System.Drawing

程序集:

System.Drawing.Primitives.dll

用指定的位置和大小初始化 RectangleF 类的新实例。

重载

RectangleF(Vector4)	从指定的 Vector4初始化 结构的新实例RectangleF。
RectangleF(PointF, SizeF)	用指定的位置和大小初始化 RectangleF 类的新实例。
RectangleF(Single, Single, Single, Single)	用指定的位置和大小初始化 RectangleF 类的新实例。

RectangleF(Vector4)

Source:

RectangleF.cs

从指定的 Vector4初始化 结构的新实例RectangleF。

public:
 RectangleF(System::Numerics::Vector4 vector);

public RectangleF (System.Numerics.Vector4 vector);

new System.Drawing.RectangleF : System.Numerics.Vector4 -> System.Drawing.RectangleF

Public Sub New (vector As Vector4)

参数

vector

Vector4

源向量。

RectangleF(PointF, SizeF)

Source:

RectangleF.cs

用指定的位置和大小初始化 RectangleF 类的新实例。

public:
 RectangleF(System::Drawing::PointF location, System::Drawing::SizeF size);

public RectangleF (System.Drawing.PointF location, System.Drawing.SizeF size);

new System.Drawing.RectangleF : System.Drawing.PointF * System.Drawing.SizeF -> System.Drawing.RectangleF

Public Sub New (location As PointF, size As SizeF)

参数

location

PointF

PointF，它表示矩形区域的左上角。

size

SizeF

SizeF，它表示矩形区域的宽度和高度。

示例

下面的代码示例演示如何使用 Implicit、 RectangleF和 Equality 成员。 此示例旨在与 Windows 窗体一起使用。 将此代码粘贴到窗体中， ConvertRectangleToRectangleF 并在处理窗体 Paint 的事件时调用 方法，作为 ePaintEventArgs传递。

private:
   void ConvertRectangleToRectangleF( PaintEventArgs^ e )
   {
      // Create a rectangle.
      Rectangle rectangle1 = Rectangle(30,40,50,100);

      // Convert it to a RectangleF.
      RectangleF convertedRectangle = rectangle1;

      // Create a new RectangleF.
      RectangleF rectangle2 = RectangleF(PointF(30.0F,40.0F),SizeF(50.0F,100.0F));

      // Create a custom, partially transparent brush.
      SolidBrush^ redBrush = gcnew SolidBrush( Color::FromArgb( 40, Color::Red ) );

      // Compare the converted rectangle with the new one.  If they 
      // are equal draw and fill the rectangles on the form.
      if ( convertedRectangle == rectangle2 )
      {
         e->Graphics->FillRectangle( redBrush, rectangle2 );
      }

      // Dispose of the custom brush.
      delete redBrush;
   }
};

private void ConvertRectangleToRectangleF(PaintEventArgs e)
{

    // Create a rectangle.
    Rectangle rectangle1 = new Rectangle(30, 40, 50, 100);

    // Convert it to a RectangleF.
    RectangleF convertedRectangle = rectangle1;

    // Create a new RectangleF.
    RectangleF rectangle2 = new RectangleF(new PointF(30.0F, 40.0F),
        new SizeF(50.0F, 100.0F));

    // Create a custom, partially transparent brush.
    SolidBrush redBrush = new SolidBrush(Color.FromArgb(40, Color.Red));

    // Compare the converted rectangle with the new one.  If they 
    // are equal draw and fill the rectangles on the form.
    if (convertedRectangle == rectangle2)
    {
        e.Graphics.FillRectangle(redBrush, rectangle2);
    }

    // Dispose of the custom brush.
    redBrush.Dispose();
}

Private Sub ConvertRectangleToRectangleF( _
    ByVal e As PaintEventArgs)

    ' Create a rectangle.
    Dim rectangle1 As New Rectangle(30, 40, 50, 100)

    ' Convert it to a RectangleF.
    Dim convertedRectangle As RectangleF = _
        RectangleF.op_Implicit(rectangle1)

    ' Create a new RectangleF.
    Dim rectangle2 As New RectangleF(New PointF(30.0F, 40.0F), _
        New SizeF(50.0F, 100.0F))

    ' Create a custom, partially transparent brush.
    Dim redBrush As New SolidBrush(Color.FromArgb(40, Color.Red))

    ' Compare the converted rectangle with the new one.  If they 
    ' are equal, draw and fill the rectangles on the form.
    If (RectangleF.op_Equality(convertedRectangle, rectangle2)) Then
        e.Graphics.FillRectangle(redBrush, rectangle2)
    End If

    ' Dispose of the custom brush.
    redBrush.Dispose()
End Sub

RectangleF(Single, Single, Single, Single)

Source:

RectangleF.cs

用指定的位置和大小初始化 RectangleF 类的新实例。

public:
 RectangleF(float x, float y, float width, float height);

public RectangleF (float x, float y, float width, float height);

new System.Drawing.RectangleF : single * single * single * single -> System.Drawing.RectangleF

Public Sub New (x As Single, y As Single, width As Single, height As Single)

参数

x

Single

矩形左上角的 x 坐标。

y

Single

矩形左上角的 y 坐标。

width

Single

矩形的宽度。

height

Single

矩形的高度。

示例

下面的代码示例演示如何使用 RectangleF、 Round 和 Truncate 成员。 此示例旨在与 Windows 窗体一起使用。 将此代码粘贴到窗体中， RoundingAndTruncatingRectangles 并在处理窗体 Paint 的事件时调用 方法，作为 ePaintEventArgs传递。

private:
   void RoundingAndTruncatingRectangles( PaintEventArgs^ e )
   {
      // Construct a new RectangleF.
      RectangleF myRectangleF = RectangleF(30.6F,30.7F,40.8F,100.9F);

      // Call the Round method.
      Rectangle roundedRectangle = Rectangle::Round( myRectangleF );

      // Draw the rounded rectangle in red.
      Pen^ redPen = gcnew Pen( Color::Red,4.0f );
      e->Graphics->DrawRectangle( redPen, roundedRectangle );

      // Call the Truncate method.
      Rectangle truncatedRectangle = Rectangle::Truncate( myRectangleF );

      // Draw the truncated rectangle in white.
      Pen^ whitePen = gcnew Pen( Color::White,4.0f );
      e->Graphics->DrawRectangle( whitePen, truncatedRectangle );

      // Dispose of the custom pens.
      delete redPen;
      delete whitePen;
   }

private void RoundingAndTruncatingRectangles(PaintEventArgs e)
{

    // Construct a new RectangleF.
    RectangleF myRectangleF = 
        new RectangleF(30.6F, 30.7F, 40.8F, 100.9F);

    // Call the Round method.
    Rectangle roundedRectangle = Rectangle.Round(myRectangleF);

    // Draw the rounded rectangle in red.
    Pen redPen = new Pen(Color.Red, 4);
    e.Graphics.DrawRectangle(redPen, roundedRectangle);

    // Call the Truncate method.
    Rectangle truncatedRectangle = Rectangle.Truncate(myRectangleF);

    // Draw the truncated rectangle in white.
    Pen whitePen = new Pen(Color.White, 4);
    e.Graphics.DrawRectangle(whitePen, truncatedRectangle);

    // Dispose of the custom pens.
    redPen.Dispose();
    whitePen.Dispose();
}

Private Sub RoundingAndTruncatingRectangles( _
    ByVal e As PaintEventArgs)

    ' Construct a new RectangleF.
    Dim myRectangleF As New RectangleF(30.6F, 30.7F, 40.8F, 100.9F)

    ' Call the Round method.
    Dim roundedRectangle As Rectangle = Rectangle.Round(myRectangleF)

    ' Draw the rounded rectangle in red.
    Dim redPen As New Pen(Color.Red, 4)
    e.Graphics.DrawRectangle(redPen, roundedRectangle)

    ' Call the Truncate method.
    Dim truncatedRectangle As Rectangle = _
        Rectangle.Truncate(myRectangleF)

    ' Draw the truncated rectangle in white.
    Dim whitePen As New Pen(Color.White, 4)
    e.Graphics.DrawRectangle(whitePen, truncatedRectangle)

    ' Dispose of the custom pens.
    redPen.Dispose()
    whitePen.Dispose()
End Sub