在PictureBox中用顏色填充一個部分

我必須PicureBox用純色填充里面的一個部分。我已經設法用這段代碼做到了：

private void fillForm(object sender, MouseEventArgs e)
        {
            MouseEventArgs me = (MouseEventArgs)e;
            Point coordinates = me.Location; // get mouse click coordinates
            Graphics graphics = Graphics.FromImage(imageSection.Image);
            fillDownRight(coordinates);
            fillUpLeft(new Point(coordinates.X - 1, coordinates.Y));
            fillUpRight(new Point(coordinates.X, coordinates.Y - 1));
            fillDownLeft(new Point(coordinates.X - 1, coordinates.Y   1));
            graphics.Dispose();
            imageSection.Refresh();
        }

        private void fillDownRight(Point coordinates)
        {
            Bitmap bitmap = ((Bitmap)imageSection.Image);

            if (coordinates.Y < bitmap.Height && coordinates.X   1 < bitmap.Width)
            {
                int pixelColor = bitmap.GetPixel(coordinates.X, coordinates.Y).ToArgb();
                if (pixelColor != Color.Black.ToArgb() && pixelColor != pen.Color.ToArgb())
                {
                    bitmap.SetPixel(coordinates.X, coordinates.Y, pen.Color);
                    fillDownRight(new Point(coordinates.X, coordinates.Y   1));
                    fillDownRight(new Point(coordinates.X   1, coordinates.Y));
                }
            }
        }
        private void fillUpLeft(Point coordinates)
        {
            Bitmap bitmap = ((Bitmap)imageSection.Image);

            if (coordinates.Y >= Constants.coordinatesZero && coordinates.X >= Constants.coordinatesZero)
            {
                int pixelColor = bitmap.GetPixel(coordinates.X, coordinates.Y).ToArgb();
                if (pixelColor != Color.Black.ToArgb() && pixelColor != pen.Color.ToArgb())
                {
                    bitmap.SetPixel(coordinates.X, coordinates.Y, pen.Color);
                    fillUpLeft(new Point(coordinates.X, coordinates.Y - 1));
                    fillUpLeft(new Point(coordinates.X - 1, coordinates.Y));
                }
            }
        }

        private void fillUpRight(Point coordinates)
        {
            Bitmap bitmap = ((Bitmap)imageSection.Image);


            if (coordinates.Y >= Constants.coordinatesZero && coordinates.X < bitmap.Width)
            {
                int pixelColor = bitmap.GetPixel(coordinates.X, coordinates.Y).ToArgb();
                if (pixelColor != Color.Black.ToArgb() && pixelColor != pen.Color.ToArgb())
                {
                    bitmap.SetPixel(coordinates.X, coordinates.Y, pen.Color);
                    fillUpRight(new Point(coordinates.X, coordinates.Y - 1));
                    fillUpRight(new Point(coordinates.X   1, coordinates.Y));
                }
            }
        }

        private void fillDownLeft(Point coordinates)
        {
            Bitmap bitmap = ((Bitmap)imageSection.Image);
            if (coordinates.Y < bitmap.Height && coordinates.X > Constants.coordinatesZero)
            {
                int pixelColor = bitmap.GetPixel(coordinates.X, coordinates.Y).ToArgb();
                if (pixelColor != Color.Black.ToArgb() && pixelColor != pen.Color.ToArgb())
                {
                    bitmap.SetPixel(coordinates.X, coordinates.Y, pen.Color);
                    fillDownLeft(new Point(coordinates.X - 1, coordinates.Y));
                    fillDownLeft(new Point(coordinates.X, coordinates.Y   1));
                }
            }
        }

所以基本上我的代碼執行以下操作：

1. 獲取我點擊的坐標
2. 然后如果遞回地填充所有“空白”像素（沒有顏色），直到找到彩色/黑色像素

我PictureBox的樣子是這樣的：

如果我單擊所選區域：

PictureBox應該是這樣 的：

我想問是否有更快/更好的方法來填充該部分。

uj5u.com熱心網友回復：

我使用LinkedList<>. 使用Stack<>似乎更慢，因為它必須在填充時調整其內部陣列的大小。（源代碼Stack<>）

static class FloodFill
{
    public static void Fill(this Bitmap bitmap, Color sourceColor,
             Color newColor, int x, int y)
    {
        var sourceArgb = sourceColor.ToArgb();
        var newArgb = newColor.ToArgb();
        if (sourceArgb == newArgb)
        {
            return;
        }
        LinkedList<Point> list = new LinkedList<Point>();
        list.AddLast(new Point(x, y));
        do
        {
            x = list.Last.Value.X;
            y = list.Last.Value.Y;
            list.RemoveLast();
            if (x < 0 || x >= bitmap.Width || y < 0 || y >= bitmap.Height)
            {
                list.RemoveLast();
                continue;
            }
            if (bitmap.GetPixel(x, y).ToArgb() == sourceArgb)
            {
                bitmap.SetPixel(x, y, newColor);
                list.AddLast(new Point(x   1, y));
                list.AddLast(new Point(x - 1, y));
                list.AddLast(new Point(x, y   1));
                list.AddLast(new Point(x, y - 1));
            }
        }
        while (list.Last != null);
    }
}

客戶端代碼是

private void PictureBox1_MouseClick(object sender, MouseEventArgs e)
{
    Bitmap bitmap = pictureBox1.Image as Bitmap;
    bitmap.Fill(bitmap.GetPixel(e.X, e.Y), Color.Blue, e.X, e.Y);
    pictureBox1.Invalidate();
}

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