Bitmap.SetPixel(Int32, Int32, Color) 方法

定义

命名空间:

System.Drawing

程序集:

System.Drawing.Common.dll

包:

System.Drawing.Common v9.0.0-rc.2.24474.1

Source:

Bitmap.cs

设置此 Bitmap中指定像素的颜色。

public:
 void SetPixel(int x, int y, System::Drawing::Color color);

public void SetPixel (int x, int y, System.Drawing.Color color);

member this.SetPixel : int * int * System.Drawing.Color -> unit

Public Sub SetPixel (x As Integer, y As Integer, color As Color)

参数

x

Int32

要设置的像素的 x 坐标。

y

Int32

要设置的像素的 y 坐标。

color

Color

表示要分配给指定像素的颜色的 Color 结构。

例外

Exception

操作失败。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。 该代码执行以下操作：

• 创建 Bitmap。

• 将位图中每个像素的颜色设置为黑色。

• 绘制位图。

private:
   void SetPixel_Example( PaintEventArgs^ e )
   {
      // Create a Bitmap object from a file.
      Bitmap^ myBitmap = gcnew Bitmap( "Grapes.jpg" );

      // Draw myBitmap to the screen.
      e->Graphics->DrawImage( myBitmap, 0, 0, myBitmap->Width, myBitmap->Height );

      // Set each pixel in myBitmap to black.
      for ( int Xcount = 0; Xcount < myBitmap->Width; Xcount++ )
      {
         for ( int Ycount = 0; Ycount < myBitmap->Height; Ycount++ )
         {
            myBitmap->SetPixel( Xcount, Ycount, Color::Black );
         }
      }

      // Draw myBitmap to the screen again.
      e->Graphics->DrawImage( myBitmap, myBitmap->Width, 0, myBitmap->Width, myBitmap->Height );
   }

private void SetPixel_Example(PaintEventArgs e)
{

    // Create a Bitmap object from a file.
    Bitmap myBitmap = new Bitmap("Grapes.jpg");

    // Draw myBitmap to the screen.
    e.Graphics.DrawImage(myBitmap, 0, 0, myBitmap.Width,
        myBitmap.Height);

    // Set each pixel in myBitmap to black.
    for (int Xcount = 0; Xcount < myBitmap.Width; Xcount++)
    {
        for (int Ycount = 0; Ycount < myBitmap.Height; Ycount++)
        {
            myBitmap.SetPixel(Xcount, Ycount, Color.Black);
        }
    }

    // Draw myBitmap to the screen again.
    e.Graphics.DrawImage(myBitmap, myBitmap.Width, 0,
        myBitmap.Width, myBitmap.Height);
}

Private Sub SetPixel_Example(ByVal e As PaintEventArgs)

    ' Create a Bitmap object from a file.
    Dim myBitmap As New Bitmap("Grapes.jpg")

    ' Draw myBitmap to the screen.
    e.Graphics.DrawImage(myBitmap, 0, 0, myBitmap.Width, _
    myBitmap.Height)

    ' Set each pixel in myBitmap to black.
    Dim Xcount As Integer
    For Xcount = 0 To myBitmap.Width - 1
        Dim Ycount As Integer
        For Ycount = 0 To myBitmap.Height - 1
            myBitmap.SetPixel(Xcount, Ycount, Color.Black)
        Next Ycount
    Next Xcount

    ' Draw myBitmap to the screen again.
    e.Graphics.DrawImage(myBitmap, myBitmap.Width, 0, myBitmap.Width, _
        myBitmap.Height)
End Sub

注解

使用 SetPixel 方法以编程方式设置图像中单个像素的颜色。 还可以使用 LockBits 方法以编程方式更改映像。 通常，对于大规模更改，LockBits 方法可提供更好的性能。