本文实例为大家分享了C#绘制正方形图片的的具体代码，供大家参考，具体内容如下
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using System;using System.Collections.Generic;using System.Drawing;using System.Drawing.Drawing2D;using System.Drawing.Imaging;using System.Linq;using System.Text;using System.Threading.Tasks;namespace treads{ /// <summary> /// 制作小正方形 /// </summary> class Class3 { private string srcFileName = @"x";//获取图片的路径 private string srcFileName1 = @"x";//要保持图片的新路径 /// <summary> /// 保存图片 /// </summary> /// <param name="image">Image 对象</param> /// <param name="savePath">保存路径</param> /// <param name="ici">指定格式的编解码参数</param> private static void SaveImage(Image image, string savePath, ImageCodecInfo ici) { //设置 原图片 对象的 EncoderParameters 对象 EncoderParameters parameters = new EncoderParameters(1); parameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, ((long)100)); image.Save(savePath, ici, parameters); parameters.Dispose(); } /// <summary> /// 获取图像编码解码器的所有相关信息 /// </summary> /// <param name="mimeType">包含编码解码器的多用途网际邮件扩充协议 (MIME) 类型的字符串</param> /// <returns>返回图像编码解码器的所有相关信息</returns> private static ImageCodecInfo GetCodecInfo(string mimeType) { ImageCodecInfo[] CodecInfo = ImageCodecInfo.GetImageEncoders(); foreach (ImageCodecInfo ici in CodecInfo) { if (ici.MimeType == mimeType) return ici; } return null; } /// <summary> /// 计算新尺寸 /// </summary> /// <param name="width">原始宽度</param> /// <param name="height">原始高度</param> /// <param name="maxWidth">最大新宽度</param> /// <param name="maxHeight">最大新高度</param> /// <returns></returns> private static Size ResizeImage(int width, int height, int maxWidth, int maxHeight) { //此次2012-02-05修改过================= if (maxWidth <= 0) maxWidth = width; if (maxHeight <= 0) maxHeight = height; //以上2012-02-05修改过================= decimal MAX_WIDTH = (decimal)maxWidth; decimal MAX_HEIGHT = (decimal)maxHeight; decimal ASPECT_RATIO = MAX_WIDTH / MAX_HEIGHT; int newWidth, newHeight; decimal originalWidth = (decimal)width; decimal originalHeight = (decimal)height; if (originalWidth > MAX_WIDTH || originalHeight > MAX_HEIGHT) { decimal factor; // determine the largest factor if (originalWidth / originalHeight > ASPECT_RATIO) { factor = originalWidth / MAX_WIDTH; newWidth = Convert.ToInt32(originalWidth / factor); newHeight = Convert.ToInt32(originalHeight / factor); } else { factor = originalHeight / MAX_HEIGHT; newWidth = Convert.ToInt32(originalWidth / factor); newHeight = Convert.ToInt32(originalHeight / factor); } } else { newWidth = width; newHeight = height; } return new Size(newWidth, newHeight); } /// <summary> /// 得到图片格式 /// </summary> /// <param name="name">文件名称</param> /// <returns></returns> public static ImageFormat GetFormat(string name) { string ext = name.Substring(name.LastIndexOf(".") + 1); switch (ext.ToLower()) { case "jpg": case "jpeg": return ImageFormat.Jpeg; case "bmp": return ImageFormat.Bmp; case "png": return ImageFormat.Png; case "gif": return ImageFormat.Gif; default: return ImageFormat.Jpeg; } } /// <summary> /// 制作小正方形 /// </summary> /// <param name="image">图片对象</param> /// <param name="newFileName">新地址</param> /// <param name="newSize">长度或宽度</param> public static void MakeSquareImage(Image image, string newFileName, int newSize) { int i = 0; int width = image.Width; int height = image.Height; if (width > height) i = height; else i = width; Bitmap b = new Bitmap(newSize, newSize); try { 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; //清除整个绘图面并以透明背景色填充 g.Clear(Color.Transparent); if (width < height) g.DrawImage(image, new Rectangle(0, 0, newSize, newSize), new Rectangle(0, (height - width) / 2, width, width), GraphicsUnit.Pixel); else g.DrawImage(image, new Rectangle(0, 0, newSize, newSize), new Rectangle((width - height) / 2, 0, height, height), GraphicsUnit.Pixel); SaveImage(b, newFileName, GetCodecInfo("image/" + GetFormat(newFileName).ToString().ToLower())); } finally { image.Dispose(); b.Dispose(); } } /// <summary> /// 制作小正方形 /// </summary> /// <param name="fileName">图片文件名</param> /// <param name="newFileName">新地址</param> /// <param name="newSize">长度或宽度</param> public static void MakeSquareImage(string fileName,string newFileName, int newSize) { MakeSquareImage(Image.FromFile(fileName), newFileName, newSize); } }} |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://www.cnblogs.com/yuanzijian-ruiec/archive/2018/10/14/9786686.html
