???????/// <summary>
??????? /// 任意角度旋轉(zhuǎn)
??????? /// </summary>
??????? /// <param name="bmp">原始圖Bitmap</param>
??????? /// <param name="angle">旋轉(zhuǎn)角度</param>
??????? /// <param name="bkColor">背景色</param>
??????? /// <returns>輸出Bitmap</returns>
??????? public static Bitmap KiRotate(Bitmap bmp, float angle, Color bkColor)
??????? {
??????????? int w = bmp.Width + 2;
??????????? int h = bmp.Height + 2;

??????????? PixelFormat pf;

??????????? if (bkColor == Color.Transparent)
??????????? {
??????????????? pf = PixelFormat.Format32bppArgb;
??????????? }
??????????? else
??????????? {
??????????????? pf = bmp.PixelFormat;
??????????? }

??????????? Bitmap tmp = new Bitmap(w, h, pf);
??????????? Graphics g = Graphics.FromImage(tmp);
??????????? g.Clear(bkColor);
??????????? g.DrawImageUnscaled(bmp, 1, 1);
??????????? g.Dispose();

??????????? GraphicsPath path = new GraphicsPath();
??????????? path.AddRectangle(new RectangleF(0f, 0f, w, h));
??????????? Matrix mtrx = new Matrix();
??????????? mtrx.Rotate(angle);
??????????? RectangleF rct = path.GetBounds(mtrx);

??????????? Bitmap dst = new Bitmap((int)rct.Width, (int)rct.Height, pf);
??????????? g = Graphics.FromImage(dst);
??????????? g.Clear(bkColor);
??????????? g.TranslateTransform(-rct.X, -rct.Y);
??????????? g.RotateTransform(angle);
??????????? g.InterpolationMode = InterpolationMode.HighQualityBilinear;
??????????? g.DrawImageUnscaled(tmp, 0, 0);
??????????? g.Dispose();

??????????? tmp.Dispose();

??????????? return dst;
??????? }

轉(zhuǎn)載于:https://www.cnblogs.com/Allen_Jo/archive/2009/09/15/1566863.html

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