Bitmap.GetPixel(Int32, Int32) 方法

定義

取得這個 Bitmap 中指定像素的色彩。

public:
 System::Drawing::Color GetPixel(int x, int y);
public System.Drawing.Color GetPixel (int x, int y);
member this.GetPixel : int * int -> System.Drawing.Color
Public Function GetPixel (x As Integer, y As Integer) As Color

參數

x
Int32

要擷取的像素 X 座標。

y
Int32

要擷取的像素 Y 座標。

傳回

Color

Color 結構,表示指定像素的色彩。

例外狀況

x 小於零,或大於等於 Width

-或-

y 小於零,或大於等於 Height

作業失敗。

範例

下列程式碼範例是設計來搭配Windows Forms使用,而且需要 PaintEventArgs e ,這是事件處理常式的參數 Paint 。 程式碼會取得點陣圖中圖元的色彩,然後填滿該色彩的矩形。

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

      // Get the color of a pixel within myBitmap.
      Color pixelColor = myBitmap->GetPixel( 50, 50 );

      // Fill a rectangle with pixelColor.
      SolidBrush^ pixelBrush = gcnew SolidBrush( pixelColor );
      e->Graphics->FillRectangle( pixelBrush, 0, 0, 100, 100 );
   }
private void GetPixel_Example(PaintEventArgs e)
{

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

    // Get the color of a pixel within myBitmap.
    Color pixelColor = myBitmap.GetPixel(50, 50);

    // Fill a rectangle with pixelColor.
    SolidBrush pixelBrush = new SolidBrush(pixelColor);
    e.Graphics.FillRectangle(pixelBrush, 0, 0, 100, 100);
}
Private Sub GetPixel_Example(ByVal e As PaintEventArgs)

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

    ' Get the color of a pixel within myBitmap.
    Dim pixelColor As Color = myBitmap.GetPixel(50, 50)

    ' Fill a rectangle with pixelColor.
    Dim pixelBrush As New SolidBrush(pixelColor)
    e.Graphics.FillRectangle(pixelBrush, 0, 0, 100, 100)
End Sub

適用於