我想在我的应用程序中有一幅图片,可以旋转以指示风向等方向。甚至是时间。我用什么代码旋转图片?谢谢
更新:我正在使用.NET 2.0,Windows 2000,VS C#2005
您可以使用以下方法在C#中旋转图像:
/// <summary> /// method to rotate an image either clockwise or counter-clockwise /// </summary> /// <param name="img">the image to be rotated</param> /// <param name="rotationAngle">the angle (in degrees). /// NOTE: /// Positive values will rotate clockwise /// negative values will rotate counter-clockwise /// </param> /// <returns></returns> public static Image RotateImage(Image img, float rotationAngle) { //create an empty Bitmap image Bitmap bmp = new Bitmap(img.Width, img.Height); //turn the Bitmap into a Graphics object Graphics gfx = Graphics.FromImage(bmp); //now we set the rotation point to the center of our image gfx.TranslateTransform((float)bmp.Width / 2, (float)bmp.Height / 2); //now rotate the image gfx.RotateTransform(rotationAngle); gfx.TranslateTransform(-(float)bmp.Width / 2, -(float)bmp.Height / 2); //set the InterpolationMode to HighQualityBicubic so to ensure a high //quality image once it is transformed to the specified size gfx.InterpolationMode = InterpolationMode.HighQualityBicubic; //now draw our new image onto the graphics object gfx.DrawImage(img, new Point(0, 0)); //dispose of our Graphics object gfx.Dispose(); //return the image return bmp; }