1 /// <summary> 2 /// 从图片中截取部分生成新图 3 /// </summary> 4 /// <param name="sFromFilePath">原始图片</param> 5 /// <param name="saveFilePath">生成新图</param> 6 /// <param name="width">截取图片宽度</param> 7 /// <param name="height">截取图片高度</param> 8 /// <param name="spaceX">截图图片X坐标</param> 9 /// <param name="spaceY">截取图片Y坐标</param> 10 public static void CaptureImage(string sFromFilePath, string saveFilePath, int width, int height, int spaceX, int spaceY) 11 { 12 //载入底图 13 Image fromImage = Image.FromFile(sFromFilePath); 14 int x = 0; //截取X坐标 15 int y = 0; //截取Y坐标 16 //原图宽与生成图片宽 之差 17 //当小于0(即原图宽小于要生成的图)时，新图宽度为较小者 即原图宽度 X坐标则为0 18 //当大于0(即原图宽大于要生成的图)时，新图宽度为设置值 即width X坐标则为 sX与spaceX之间较小者 19 //Y方向同理 20 int sX = fromImage.Width - width; 21 int sY = fromImage.Height - height; 22 if (sX > 0) 23 { 24 x = sX > spaceX ? spaceX : sX; 25 } 26 else 27 { 28 width = fromImage.Width; 29 } 30 if (sY > 0) 31 { 32 y = sY > spaceY ? spaceY : sY; 33 } 34 else 35 { 36 height = fromImage.Height; 37 } 38 39 //创建新图位图 40 Bitmap bitmap = new Bitmap(width, height); 41 //创建作图区域 42 Graphics graphic = Graphics.FromImage(bitmap); 43 //截取原图相应区域写入作图区 44 graphic.DrawImage(fromImage, new Rectangle(0, 0, width, height), new Rectangle(x, y, width, height), GraphicsUnit.Pixel); 45 //从作图区生成新图 46 Image saveImage = Image.FromHbitmap(bitmap.GetHbitmap()); 47 //保存图象 48 if (!Directory.Exists(Path.GetDirectoryName(saveFilePath))) 49 { 50 Directory.CreateDirectory(Path.GetDirectoryName(saveFilePath)); 51 } 52 53 saveImage.Save(saveFilePath, System.Drawing.Imaging.ImageFormat.Png);//此處出現錯誤，可能圖片(saveFilePath)正在被其他應用訪問 54 //释放资源 55 saveImage.Dispose(); 56 }