How to generate custom images in c#? c# Generate custom picture method

using System.Drawing;using System.IO;using System.Drawing.Imaging;using System;namespace treads { /// 
 /// 生成略缩图 /// 
 public class Class2 { private Image srcImage; private string srcFileName= @"X";//获取图片的路径 private string srcFileName1 = @"x";//要保持图片的新路径 /// 
 /// 回调 /// 
 ///  public bool ThumbnailCallback() { return false; } /// 
 /// 保存缩略图 /// 
 ///  ///  public void SaveThumbnailImage(int Width, int Height) { switch (Path.GetExtension(srcFileName).ToLower()) { case ".png": SaveImage(Width, Height, ImageFormat.Png); break; case ".gif": SaveImage(Width, Height, ImageFormat.Gif); break; default: SaveImage(Width, Height, ImageFormat.Jpeg); break; } } /// 
 /// 生成缩略图并保存 /// 
 /// 缩略图的宽度 /// 缩略图的高度 /// 保存的图像格式 /// 缩略图的Image对象 public void SaveImage(int Width, int Height, ImageFormat imgformat) { srcImage = Image.FromFile(srcFileName); if (imgformat != ImageFormat.Gif && (srcImage.Width > Width) || (srcImage.Height > Height)) { Image img; Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback); img = srcImage.GetThumbnailImage(Width, Height, callb, IntPtr.Zero); srcImage.Dispose(); img.Save(srcFileName1, imgformat); img.Dispose(); } } } }

/// 
 /// 制作远程缩略图 /// 
 /// 图片URL /// 新图路径 /// 最大宽度 /// 最大高度 public static void MakeRemoteThumbnailImage(string url, string newFileName, int maxWidth, int maxHeight) { Stream stream = GetRemoteImage(url); if (stream == null) return; Image original = Image.FromStream(stream); stream.Close(); MakeThumbnailImage(original, newFileName, maxWidth, maxHeight); } /// 
 /// 获取图片流 /// 
 /// 图片URL ///  private static Stream GetRemoteImage(string url) { HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url); request.Method = "GET"; request.ContentLength = 0; request.Timeout = 20000; HttpWebResponse response = null; try { response = (HttpWebResponse)request.GetResponse(); return response.GetResponseStream(); } catch { return null; } } /// 
 /// 裁剪图片并保存 /// 
 /// 源图路径（绝对路径） /// 缩略图路径（绝对路径） /// 缩略图宽度 /// 缩略图高度 /// 裁剪宽度 /// 裁剪高度 /// X轴 /// Y轴 public static bool MakeThumbnailImage(string fileName, string newFileName, int maxWidth, int maxHeight, int cropWidth, int cropHeight, int X, int Y) { byte[] imageBytes = File.ReadAllBytes(fileName); Image originalImage = Image.FromStream(new System.IO.MemoryStream(imageBytes)); Bitmap b = new Bitmap(cropWidth, cropHeight); try { using (Graphics g = Graphics.FromImage(b)) { //设置高质量插值法 g.InterpolationMode = InterpolationMode.HighQualityBicubic; //设置高质量,低速度呈现平滑程度 g.SmoothingMode = SmoothingMode.AntiAlias; g.PixelOffsetMode = PixelOffsetMode.HighQuality; //清空画布并以透明背景色填充 g.Clear(Color.Transparent); //在指定位置并且按指定大小绘制原图片的指定部分 g.DrawImage(originalImage, new Rectangle(0, 0, cropWidth, cropHeight), X, Y, cropWidth, cropHeight, GraphicsUnit.Pixel); Image displayImage = new Bitmap(b, maxWidth, maxHeight); SaveImage(displayImage, newFileName, GetCodecInfo("image/" + GetFormat(newFileName).ToString().ToLower())); return true; } } catch (System.Exception e) { throw e; } finally { originalImage.Dispose(); b.Dispose(); } }