Image.GetBounds(GraphicsUnit) 方法

定义

命名空间:

System.Drawing

程序集:

System.Drawing.Common.dll

包:

System.Drawing.Common v8.0.0

Source:

Image.cs

以指定的单位获取图像的界限。

public:
 System::Drawing::RectangleF GetBounds(System::Drawing::GraphicsUnit % pageUnit);

public System.Drawing.RectangleF GetBounds (ref System.Drawing.GraphicsUnit pageUnit);

member this.GetBounds : GraphicsUnit -> System.Drawing.RectangleF

Public Function GetBounds (ByRef pageUnit As GraphicsUnit) As RectangleF

参数

pageUnit

GraphicsUnit

GraphicsUnit 值之一，指示边框的测量单位。

返回

RectangleF

RectangleF，以指定的单位表示图像的界限。

示例

下面的代码示例演示如何使用 GraphicsUnit 枚举从Icon句柄加载位图，以及如何使用 Round 方法绘制位图的矩形边界。

此示例旨在与 Windows 窗体 一起使用。 Create包含名为 的按钮的Button2窗体。 将代码粘贴到窗体中，并将此方法与按钮的事件 Click 相关联。

void Button2_Click( System::Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
   Bitmap^ bitmap1 = Bitmap::FromHicon( SystemIcons::Hand->Handle );
   Graphics^ formGraphics = this->CreateGraphics();
   GraphicsUnit units = GraphicsUnit::Point;
   RectangleF bmpRectangleF = bitmap1->GetBounds( units );
   Rectangle bmpRectangle = Rectangle::Round( bmpRectangleF );
   formGraphics->DrawRectangle( Pens::Blue, bmpRectangle );
   delete formGraphics;
}

private void Button2_Click(System.Object sender, System.EventArgs e)
{

    Bitmap bitmap1 = Bitmap.FromHicon(SystemIcons.Hand.Handle);
    Graphics formGraphics = this.CreateGraphics();
    GraphicsUnit units = GraphicsUnit.Point;

    RectangleF bmpRectangleF = bitmap1.GetBounds(ref units);
    Rectangle bmpRectangle = Rectangle.Round(bmpRectangleF);
    formGraphics.DrawRectangle(Pens.Blue, bmpRectangle);
    formGraphics.Dispose();
}

Private Sub Button2_Click(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles Button2.Click

    Dim bitmap1 As Bitmap = Bitmap.FromHicon(SystemIcons.Hand.Handle)
    Dim formGraphics As Graphics = Me.CreateGraphics()
    Dim units As GraphicsUnit = GraphicsUnit.Point
    Dim bmpRectangleF As RectangleF = bitmap1.GetBounds(units)
    Dim bmpRectangle As Rectangle = Rectangle.Round(bmpRectangleF)
    formGraphics.DrawRectangle(Pens.Blue, bmpRectangle)
    formGraphics.Dispose()
End Sub