C#.Net根据文字随机生成不同背景的Logo,顾名思义,本篇主题就是在C#.Net中如何根据文字生成小LOGO图像,

在App显示默认头像以及网站默认头像方面有很大应用,如果用户没有上传头像,又不想让每个没有头像的用户都使用同一个默认头像的话,可以根据用户名等随机生成不同背景不同字体的文字LOGO。


使用不同的默认头像不仅让网站或者APP看起来清新,而且给用户留下一个好印象

试想一下,一个网站里没有头像的用户达到70%,如果这70%的用户都使用默认头像,在网站里将会显示出基本都是默认头像,会让网站看起来没有生机,

如果每个用户的头像都不一样 或者都很有规律的话,就会打破这种没有生机的局面。


来张图片展示一下(根据需求可自行调节LOGO尺寸、色调、字体等)

Net根据文字随机生成不同背景的Logo


下面上代码来看下C#.Net中如何轻松搞定根据文字随机生成不同背景的LOGO


C#随机生成不同背景样式的文字logo


using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;

namespace AutoLogo
{
    /// <summary>
    /// 随机生成不同背景样式的文字logo
    /// 来自:www.jsons.cn  Json在线工具
    /// </summary>
    public partial class Default : System.Web.UI.Page
    {
        public string logoname = string.Empty;
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                string extend = "png", Name = "工具";
                string fileName = DateTime.Now.Ticks.ToString();
                string RootDir = Server.MapPath("/UploadFile/");//硬盘绝对路径
                try
                {
                    if (string.IsNullOrEmpty(fileName))
                        fileName = DateTime.Now.ToString("yyyyMMddHHmmss");

                    string saveFileName = fileName   "."   extend;
                    Stream stream = Request.InputStream;
                    //确定文件路径
                    string fileAddr = "/"   DateTime.Now.ToString("yyyyMMdd")   "/";
                    #region 生成默认logo
                    try
                    {
                        if (string.IsNullOrWhiteSpace(Name))
                        {
                            Response.Write("0");
                            return;
                        }
                        var defImgstream = AutoLogoHelper.CreateLogoImage(Name);
                        defImgstream.Position = 0;
                        byte[] datastr = new byte[defImgstream.Length];
                        defImgstream.Read(datastr, 0, datastr.Length);
                        if (!File.Exists(RootDir   fileAddr))
                            Directory.CreateDirectory(RootDir   fileAddr);
                        File.WriteAllBytes(RootDir   fileAddr   saveFileName, datastr);
                        logoname = "/UploadFile"   fileAddr   saveFileName;

                        defImgstream.Close();
                        defImgstream.Dispose();
                    }
                    catch { }
                    return;
                    #endregion
                }
                catch { }
            }
        }
    }
}
生成图片流对象:上面代码中的图片生成帮助类,生成LOGO的尺寸、色调、字体等均在此类中调节



using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Drawing;
using System.IO;

namespace AutoLogo
{
    public class AutoLogoHelper
    {
        /// <summary>
        /// 生成图片流对象
        /// 来自:www.jsons.cn  Json在线工具
        /// </summary>
        /// <param name="Name">名称</param>
        /// <returns></returns>
        public static Stream CreateLogoImage(string Name)
        {
            int sizefint = 65;
            Stream imgstream = new MemoryStream();
            try
            {
                Name = Name.Trim();
                if (Name.Length >= 3)
                {
                    Name = Name.Substring(1, 2);
                }
                string FontType = "方正正粗黑简体";
                Font theFont = new Font(FontType, sizefint);
                //背景颜色
                Color col2 = Color.FromArgb(246, 191, 39);//橙色
                Color col3 = Color.FromArgb(96, 203, 249);//蓝色
                Color col4 = Color.FromArgb(254, 0, 0);//红色
                Color col = Color.FromArgb(118, 191, 112);//绿色
                Random ran = new Random();
                switch (ran.Next(1, 4))
                {
                    case 1:
                        col = col2;
                        break;
                    case 2:
                        col = col3;
                        break;
                    case 3:
                        col = col4;
                        break;
                    default:
                        col = Color.FromArgb(118, 191, 112);
                        break;
                }
                //文字颜色
                Color coldef = Color.FromArgb(255, 255, 255);
                Brush newBrush = new SolidBrush(coldef);
                int int_ImageWidth = 0;
                int fontwidth = 110;

                if (Name.Length > 0)
                {
                    if (Name.Length < 4)
                    {
                        int_ImageWidth = Name.Length * fontwidth;
                    }
                    else
                    {
                        int_ImageWidth = Name.Length * fontwidth / 2;
                    }
                    Random newRandom = new Random();
                    //图高20px
                    Bitmap theBitmap = new Bitmap(int_ImageWidth, int_ImageWidth);
                    Graphics theGraphics = Graphics.FromImage(theBitmap);
                    SizeF ziSizeF = new SizeF();
                    ziSizeF = theGraphics.MeasureString(Name, theFont); //获取文字宽高
                    //背景色
                    theGraphics.Clear(col);
                    //10pt的字体分行
                    string sInput = Name; //获取用户名称
                    int CodeLength = Name.Length; //获取用户名字长度
                    int coloum = 3; //第一行显示字数 (如果用户名字长度=2到3个字显示一行,大于三个字显示2行)
                    if (CodeLength > 3)
                    {
                        coloum = 2;
                    }
                    if (CodeLength < 3)
                    {
                        coloum = CodeLength;
                    }
                    //利用循环,来依次输出
                    for (int i = 0, j = 0; i < sInput.Length; i  = coloum, j  )
                    {
                        if (j == 0)
                        {
                            string s = sInput.Substring(i, coloum);
                            theGraphics.DrawString(s, theFont, newBrush, (int_ImageWidth - ziSizeF.Width) / 2,
                                (int_ImageWidth - ziSizeF.Height) / 2   10);
                        }
                        else if (j == 1)
                        {
                            string s = sInput.Substring(i, sInput.Length - coloum);
                            theGraphics.DrawString(s, theFont, newBrush, (int_ImageWidth - ziSizeF.Width / 2) / 2 - 6,
                                int_ImageWidth / 2   (int_ImageWidth / 2 - ziSizeF.Height) / 2);
                        }
                    }
                    System.Drawing.Image bitmap = new System.Drawing.Bitmap(80, 80); //新建bmp图片
                    System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bitmap); //新建画板
                    g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //制定高质量插值法
                    g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //设置高质量、低速度呈现平滑程度
                    g.Clear(System.Drawing.Color.White); //清空画布
                    //在制定位置画图
                    g.DrawImage(theBitmap, new System.Drawing.Rectangle(0, 0, 80, 80),
                        new System.Drawing.Rectangle(0, 0, int_ImageWidth, int_ImageWidth),
                        System.Drawing.GraphicsUnit.Pixel);
                    //图片转换成流
                    bitmap.Save(imgstream, System.Drawing.Imaging.ImageFormat.Png);
                    theGraphics.Dispose();
                    theBitmap.Dispose();
                }
            }
            catch { }
            return imgstream;
        }
    }
}


好了,废话不多说了,如有需求可下载下面DEMO源码自行研究扩展。

Net根据文字随机生成不同背景的Logo源码DEMO下载

原文链接:Net根据文字随机生成不同背景的Logo源码DEMO下载