图片操作 bitmap 旋转 bitmap左右镜像

/// <summary>/// bitmap角度旋转/// </summary>/// <param name="image"></param>/// <param name="angle"></param>/// <returns></returns>public static Bitmap RotateImage(Bitmap image, int angle){try{// 创建一个新的Bitmap对象，宽度和高度互换Bitmap rotatedImage = new Bitmap(image.Height, image.Width);// 创建一个Graphics对象，并设置其绘制原点为新图像的中心点using (Graphics g = Graphics.FromImage(rotatedImage)){g.TranslateTransform(rotatedImage.Width / 2, rotatedImage.Height / 2);// 设置旋转角度为90度g.RotateTransform(angle);// 将原图像绘制到新图像上g.DrawImage(image, -image.Width / 2, -image.Height / 2, image.Width, image.Height);return rotatedImage;}}catch (AccessViolationException ave){return null;}}/// <summary>///  bitmap角度旋转/// </summary>/// <param name="originalImage"></param>/// <param name="angle"></param>/// <returns></returns>public static Bitmap RotateImage2(Bitmap originalImage, float angle){// 计算旋转后的包围矩形大小int width = originalImage.Width;int height = originalImage.Height;double radians = angle * Math.PI / 180.0;double sin = Math.Abs(Math.Sin(radians));double cos = Math.Abs(Math.Cos(radians));int newWidth = (int)Math.Floor(width * cos + height * sin);int newHeight = (int)Math.Floor(width * sin + height * cos);// 创建一个新的Bitmap，大小足够容纳旋转后的图像Bitmap rotatedImage = new Bitmap(newWidth, newHeight);using (Graphics g = Graphics.FromImage(rotatedImage)){// 设置插值模式和平滑模式g.InterpolationMode = InterpolationMode.HighQualityBicubic;g.SmoothingMode = SmoothingMode.HighQuality;g.PixelOffsetMode = PixelOffsetMode.HighQuality;g.CompositingQuality = CompositingQuality.HighQuality;// 计算旋转后的位置，以便将原始图像绘制到新的Bitmap中心Point center = new Point(newWidth / 2, newHeight / 2);g.TranslateTransform(center.X, center.Y);g.RotateTransform(angle);g.TranslateTransform(-center.X, -center.Y);// 在新的Bitmap上绘制旋转后的图像g.DrawImage(originalImage, new Point((newWidth - width) / 2, (newHeight - height) / 2));}return rotatedImage;}/// <summary>/// 图像镜像转换/// </summary>/// <param name="originalBitmap"></param>/// <returns></returns>public static Bitmap BitmapImage2(Bitmap originalImage){{// 创建一个与原始图片大小相同的空白图片Bitmap flippedImage = new Bitmap(originalImage.Width, originalImage.Height);// 获取空白图片的绘图对象using (Graphics g = Graphics.FromImage(flippedImage)){// 水平翻转图片g.DrawImage(originalImage, new Rectangle(0, 0, flippedImage.Width, flippedImage.Height),new Rectangle(originalImage.Width, 0, -originalImage.Width, originalImage.Height),GraphicsUnit.Pixel);}// 保存翻转后的图片return flippedImage;}}public static Bitmap BitmapImage(Bitmap originalBitmap){// 创建一个新的Bitmap，大小与原始相同Bitmap mirroredBitmap = new Bitmap(originalBitmap.Width, originalBitmap.Height);// 循环遍历原始Bitmap的像素for (int y = 0; y < originalBitmap.Height; y++){for (int x = 0; x < originalBitmap.Width; x++){// 获取原始Bitmap中的像素颜色Color originalColor = originalBitmap.GetPixel(x, y);// 计算水平翻转后的x坐标int mirroredX = originalBitmap.Width - 1 - x;// 在新Bitmap上设置镜像像素mirroredBitmap.SetPixel(mirroredX, y, originalColor);}}return mirroredBitmap;}