C#正方形图片的绘制方法
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2023-12-15 22:07:46
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
using system;
using system.collections.ge...
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
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。