C#應用原圖和水印圖的堆疊簡略完成水印的辦法。本站提示廣大學習愛好者:(C#應用原圖和水印圖的堆疊簡略完成水印的辦法)文章只能為提供參考,不一定能成為您想要的結果。以下是C#應用原圖和水印圖的堆疊簡略完成水印的辦法正文
本文實例講述了C#應用原圖和水印圖的堆疊簡略完成水印的辦法。分享給年夜家供年夜家參考,詳細以下:
圖片操作類
/// <summary> /// 獲得一個圖片按等比例減少後的年夜小。 /// </summary> /// <param name="maxWidth">須要減少到的寬度</param> /// <param name="maxHeight">須要減少到的高度</param> /// <param name="imageOriginalWidth">圖片的原始寬度</param> /// <param name="imageOriginalHeight">圖片的原始高度</param> /// <returns>前往圖片按等比例減少後的現實年夜小</returns> public static Size GetNewSize(int maxWidth, int maxHeight, int imageOriginalWidth, int imageOriginalHeight) { double w = 0.0; double h = 0.0; double sw = Convert.ToDouble(imageOriginalWidth); double sh = Convert.ToDouble(imageOriginalHeight); double mw = Convert.ToDouble(maxWidth); double mh = Convert.ToDouble(maxHeight); if (sw < mw && sh < mh) { w = sw; h = sh; } else if ((sw / sh) > (mw / mh)) { w = maxWidth; h = (w * sh) / sw; } else { h = maxHeight; w = (h * sw) / sh; } return new Size(Convert.ToInt32(w), Convert.ToInt32(h)); } /// <summary> /// 對給定的一個圖片(Image對象)生成一個指定年夜小的縮略圖。 /// </summary> /// <param name="originalImage">原始圖片</param> /// <param name="thumMaxWidth">縮略圖的寬度</param> /// <param name="thumMaxHeight">縮略圖的高度</param> /// <returns>前往縮略圖的Image對象</returns> public static System.Drawing.Image GetThumbNailImage(System.Drawing.Image originalImage, int thumMaxWidth, int thumMaxHeight) { Size thumRealSize = Size.Empty; System.Drawing.Image newImage = originalImage; Graphics graphics = null; try { thumRealSize = GetNewSize(thumMaxWidth, thumMaxHeight, originalImage.Width, originalImage.Height); newImage = new Bitmap(thumRealSize.Width, thumRealSize.Height); graphics = Graphics.FromImage(newImage); graphics.CompositingQuality = CompositingQuality.HighQuality; graphics.InterpolationMode = InterpolationMode.HighQualityBicubic; graphics.SmoothingMode = SmoothingMode.HighQuality; graphics.Clear(Color.Transparent); graphics.DrawImage(originalImage, new Rectangle(0, 0, thumRealSize.Width, thumRealSize.Height), new Rectangle(0, 0, originalImage.Width, originalImage.Height), GraphicsUnit.Pixel); } catch { } finally { if (graphics != null) { graphics.Dispose(); graphics = null; } } return newImage; } /// <summary> /// 對給定的一個圖片文件生成一個指定年夜小的縮略圖。 /// </summary> /// <param name="originalImage">圖片的物理文件地址</param> /// <param name="thumMaxWidth">縮略圖的寬度</param> /// <param name="thumMaxHeight">縮略圖的高度</param> /// <returns>前往縮略圖的Image對象</returns> public static System.Drawing.Image GetThumbNailImage(string imageFile, int thumMaxWidth, int thumMaxHeight) { System.Drawing.Image originalImage = null; System.Drawing.Image newImage = null; try { originalImage = System.Drawing.Image.FromFile(imageFile); newImage = GetThumbNailImage(originalImage, thumMaxWidth, thumMaxHeight); } catch { } finally { if (originalImage != null) { originalImage.Dispose(); originalImage = null; } } return newImage; } /// <summary> /// 對給定的一個圖片文件生成一個指定年夜小的縮略圖,並將縮略圖保留到指定地位。 /// </summary> /// <param name="originalImageFile">圖片的物理文件地址</param> /// <param name="thumbNailImageFile">縮略圖的物理文件地址</param> /// <param name="thumMaxWidth">縮略圖的寬度</param> /// <param name="thumMaxHeight">縮略圖的高度</param> public static void MakeThumbNail(string originalImageFile, string thumbNailImageFile, int thumMaxWidth, int thumMaxHeight) { System.Drawing.Image newImage = GetThumbNailImage(originalImageFile, thumMaxWidth, thumMaxHeight); try { newImage.Save(thumbNailImageFile, ImageFormat.Jpeg); } catch { } finally { newImage.Dispose(); newImage = null; } } /// <summary> /// 將一個圖片的內存流調劑為指定年夜小,並前往調劑後的內存流。 /// </summary> /// <param name="originalImageStream">原始圖片的內存流</param> /// <param name="newWidth">新圖片的寬度</param> /// <param name="newHeight">新圖片的高度</param> /// <returns>前往調劑後的圖片的內存流</returns> public static MemoryStream ResizeImage(Stream originalImageStream, int newWidth, int newHeight) { MemoryStream newImageStream = null; System.Drawing.Image newImage = Globals.GetThumbNailImage(System.Drawing.Image.FromStream(originalImageStream), newWidth, newHeight); if (newImage != null) { newImageStream = new MemoryStream(); newImage.Save(newImageStream, ImageFormat.Jpeg); } return newImageStream; } /// <summary> /// 將一個內存流保留為磁盤文件。 /// </summary> /// <param name="stream">內存流</param> /// <param name="newFile">目的磁盤文件地址</param> public static void SaveStreamToFile(Stream stream, string newFile) { if (stream == null || stream.Length == 0 || string.IsNullOrEmpty(newFile)) { return; } byte[] buffer = new byte[stream.Length]; stream.Position = 0; stream.Read(buffer, 0, buffer.Length); FileStream fileStream = new FileStream(newFile, FileMode.OpenOrCreate, FileAccess.Write); fileStream.Write(buffer, 0, buffer.Length); fileStream.Flush(); fileStream.Close(); fileStream.Dispose(); } /// <summary> /// 對一個指定的圖片加上圖片水印後果。 /// </summary> /// <param name="imageFile">圖片文件地址</param> /// <param name="waterImage">水印圖片(Image對象)</param> public static void CreateImageWaterMark(string imageFile, System.Drawing.Image waterImage) { if (string.IsNullOrEmpty(imageFile) || !File.Exists(imageFile) || waterImage == null) { return; } System.Drawing.Image originalImage = System.Drawing.Image.FromFile(imageFile); if (originalImage.Width - 10 < waterImage.Width || originalImage.Height - 10 < waterImage.Height) { return; } Graphics graphics = Graphics.FromImage(originalImage); int x = originalImage.Width - waterImage.Width - 10; int y = originalImage.Height - waterImage.Height - 10; int width = waterImage.Width; int height = waterImage.Height; graphics.DrawImage(waterImage, new Rectangle(x, y, width, height), 0, 0, width, height, GraphicsUnit.Pixel); graphics.Dispose(); MemoryStream stream = new MemoryStream(); originalImage.Save(stream, ImageFormat.Jpeg); originalImage.Dispose(); System.Drawing.Image imageWithWater = System.Drawing.Image.FromStream(stream); imageWithWater.Save(imageFile); imageWithWater.Dispose(); } /// <summary> /// 對一個指定的圖片加上文字水印後果。 /// </summary> /// <param name="imageFile">圖片文件地址</param> /// <param name="waterText">水印文字內容</param> public static void CreateTextWaterMark(string imageFile, string waterText) { if (string.IsNullOrEmpty(imageFile) || string.IsNullOrEmpty(waterText) || !File.Exists(imageFile)) { return; } System.Drawing.Image originalImage = System.Drawing.Image.FromFile(imageFile); Graphics graphics = Graphics.FromImage(originalImage); graphics.SmoothingMode = SmoothingMode.HighQuality; graphics.TextRenderingHint = TextRenderingHint.ClearTypeGridFit; graphics.CompositingQuality = CompositingQuality.HighQuality; graphics.InterpolationMode = InterpolationMode.HighQualityBicubic; SolidBrush brush = new SolidBrush(Color.FromArgb(153, 255, 255, 255)); Font waterTextFont = new Font("Arial", 16, FontStyle.Regular); SizeF waterTextSize = graphics.MeasureString(waterText, waterTextFont); float x = (float)originalImage.Width - waterTextSize.Width - 10F; float y = (float)originalImage.Height - waterTextSize.Height - 10F; graphics.DrawString(waterText, waterTextFont, brush, x, y); graphics.Dispose(); brush.Dispose(); MemoryStream stream = new MemoryStream(); originalImage.Save(stream, ImageFormat.Jpeg); originalImage.Dispose(); System.Drawing.Image imageWithWater = System.Drawing.Image.FromStream(stream); imageWithWater.Save(imageFile); imageWithWater.Dispose(); } /// <summary> /// 斷定上傳組件能否包括內容。 /// </summary> /// <param name="fileUpload">ASP.NET 2.0尺度上傳組件</param> /// <returns>假如數據有用,則前往True,不然前往False</returns> public static bool IsAttachmentValid(FileUpload fileUpload) { if (fileUpload != null && fileUpload.PostedFile != null && !string.IsNullOrEmpty(fileUpload.PostedFile.FileName) && fileUpload.PostedFile.ContentLength > 0) { return true; } return false; }
public class ImageHelper { #region " 水印寄存的絕對途徑 " public static string GetLogoPath() { return "/images/logo.png"; ///水印圖途徑 } #endregion #region " 圖片水印 " // <summary> // 在圖片上生成圖片水印,此辦法不支撐Gif類型的圖片 // </summary> // <param name="Path">原辦事器圖片途徑</param> // <param name="Path_syp">生成的帶圖片水印的圖片途徑</param> // <param name="Path_sypf">水印圖片途徑</param> public static void MarkImage(Stream InUploadImagePath, string inLogoImagePath, string InSavePath) { System.Drawing.Image Image = System.Drawing.Image.FromStream(InUploadImagePath); System.Drawing.Image newimage = Image.FromFile(Current.Server.MapPath(inLogoImagePath)); Graphics g = Graphics.FromImage(Image); g.DrawImage(newimage, new Rectangle(Image.Width - newimage.Width, Image.Height - newimage.Height, newimage.Width, newimage.Height), 0, 0, newimage.Width, newimage.Height, GraphicsUnit.Pixel); try { Image.Save(Current.Server.MapPath(InSavePath)); } catch (Exception ex) { } finally { g.Dispose(); Image.Dispose(); newimage.Dispose(); } } #endregion }
願望本文所述對年夜家C#法式設計有所贊助。