这篇文章主要介绍“如何制作随机图片生成器”，在日常操作中，相信很多人在如何制作随机图片生成器问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”如何制作随机图片生成器”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
复制代码 代码如下:
///
/// PicHandler1 的摘要说明
///
public class PicHandler1 : IHttpHandler, IRequiresSessionState
{
private string mCheckNo = string.Empty;
protected ImgBuilder _ImgBuilder = new ImgBuilder();
protected VryImgGen _ImgBuilderNew = new VryImgGen();
private string _text = string.Empty;
private string _font = "宋体";
private int _fontSize = 8;
private int _padding = 2;
public void ProcessRequest(HttpContext context)
{
mCheckNo = DisCheckNo();
context.Session["CheckCode"] = mCheckNo;
this._ImgBuilder.FontSize = this._fontSize;
this._ImgBuilder.Padding = this._padding;
if (!string.IsNullOrEmpty(this._font))
{
this._ImgBuilder.Fonts = new string[] { this._font };
}
this._ImgBuilderNew.ChaosWight = 40;
this._ImgBuilderNew.FontSize = 25;
this._ImgBuilderNew.Padding = 3;
System.Drawing.Bitmap image =
this._ImgBuilderNew.CreateImage(mCheckNo);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
context.Response.ClearContent();
context.Response.ContentType = "image/Jpeg";
context.Response.BinaryWrite(ms.ToArray());
context.Session["CheckCode"] = mCheckNo.ToString(); //如果没有实现IRequiresSessionState，则这里会出错，也无法生成图片
context.Response.End();
}
//验证码生成
protected string DisCheckNo()
{
string hash = HashCode.GetNext();
string CheckNo = string.Empty;
Random rd = new Random(DateTime.Now.Millisecond);
for (int i = 0; i < 6; i++)
{
CheckNo += hash.Substring(rd.Next(1, hash.Length - 1), 1);
}
CheckNo = CheckNo.Replace("0", rd.Next(1, 9).ToString());
CheckNo = CheckNo.Replace("o", rd.Next(1, 9).ToString());
CheckNo = CheckNo.Replace("O", rd.Next(1, 9).ToString());
return CheckNo;
}
public bool IsReusable
{
get
{
return false;
}
}
}
调用的类
复制代码 代码如下:
using System;
using System.Drawing;
using System.Text;
///
/// VryImgGen 的摘要说明
///
public class VryImgGen
{
public static string ChineseChars = String.Empty;
///
/// 英文与数字串
///
protected static readonly string EnglishOrNumChars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
public VryImgGen()
{
rnd = new Random(unchecked((int)DateTime.Now.Ticks));
}
///
/// 全局随机数生成器
///
private Random rnd;
int length = 5;
///
/// 验证码长度(默认6个验证码的长度)
///
public int Length
{
get { return length; }
set { length = value; }
}
int fontSize = 20;
///
/// 验证码字体大小(为了显示扭曲效果，默认30像素，可以自行修改)
///
public int FontSize
{
get { return fontSize; }
set { fontSize = value; }
}
int padding = 4;
///
/// 边框补(默认4像素)
///
public int Padding
{
get { return padding; }
set { padding = value; }
}
bool chaos = true;
///
/// 是否输出燥点(默认输出)
///
public bool Chaos
{
get { return chaos; }
set { chaos = value; }
}
Color chaosColor = Color.LightGray;
///
/// 输出燥点的颜色(默认灰色)
///
public Color ChaosColor
{
get { return chaosColor; }
set { chaosColor = value; }
}
int chaosWight = 1;
///
/// 输出燥点的浓度
///
public int ChaosWight
{
get { return chaosWight; }
set { chaosWight = value; }
}
Color backgroundColor = Color.White;
///
/// 自定义背景色(默认白色)
///
public Color BackgroundColor
{
get { return backgroundColor; }
set { backgroundColor = value; }
}
Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
///
/// 自定义随机颜色数组
///
public Color[] Colors
{
get { return colors; }
set { colors = value; }
}
string[] fonts = { "Arial", "Georgia" };
///
/// 自定义字体数组
///
public string[] Fonts
{
get { return fonts; }
set { fonts = value; }
}
#region 产生波形滤镜效果
private const double PI = 3.1415926535897932384626433832795;
private const double PI2 = 6.283185307179586476925286766559;
///
/// 正弦曲线Wave扭曲图片（Edit By 51aspx.com）
///
/// 图片路径
/// 如果扭曲则选择为True
/// 波形的幅度倍数，越大扭曲的程度越高，一般为3
/// 波形的起始相位，取值区间[0-2*PI)
///
public System.Drawing.Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
{
System.Drawing.Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
// 将位图背景填充为白色
System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(destBmp);
graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);
graph.Dispose();
double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;
for (int i = 0; i < destBmp.Width; i++)
{
for (int j = 0; j < destBmp.Height; j++)
{
double dx = 0;
dx = bXDir ? (PI2 * (double)j) / dBaseAxisLen : (PI2 * (double)i) / dBaseAxisLen;
dx += dPhase;
double dy = Math.Sin(dx);
// 取得当前点的颜色
int nOldX = 0, nOldY = 0;
nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
nOldY = bXDir ? j : j + (int)(dy * dMultValue);
System.Drawing.Color color = srcBmp.GetPixel(i, j);
if (nOldX >= 0 && nOldX < destBmp.Width
&& nOldY >= 0 && nOldY < destBmp.Height)
{
destBmp.SetPixel(nOldX, nOldY, color);
}
}
}
return destBmp;
}
#endregion
///
/// 生成校验码图片
///
/// 验证码
///
public Bitmap CreateImage(string code)
{
int fSize = FontSize;
int fWidth = fSize + Padding;
int imageWidth = (int)(code.Length * fWidth) + 4 + Padding * 2;
int imageHeight = fSize * 2 + Padding * 2;
System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth - 10, imageHeight - 10);
Graphics g = Graphics.FromImage(image);
g.Clear(BackgroundColor);
//给背景添加随机生成的燥点
if (this.Chaos)
{
Pen pen = new Pen(ChaosColor, 0);
int c = ChaosWight * 10;
for (int i = 0; i < c; i++)
{
int x = rnd.Next(image.Width);
int y = rnd.Next(image.Height);
g.DrawRectangle(pen, x, y, 1, 1);
}
}
int left = 0, top = 0, top1 = 1, top2 = 1;
int n1 = (imageHeight - FontSize - Padding * 2);
int n2 = n1 / 4;
top1 = n2;
top2 = n2 * 2;
Font f;
Brush b;
int cindex, findex;
//随机字体和颜色的验证码字符
for (int i = 0; i < code.Length; i++)
{
cindex = rnd.Next(Colors.Length - 1);
findex = rnd.Next(Fonts.Length - 1);
f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
b = new System.Drawing.SolidBrush(Colors[cindex]);
if (i % 2 == 1)
{
top = top2;
}
else
{
top = top1;
}
left = i * fWidth;
g.DrawString(code.Substring(i, 1), f, b, left, top);
}
//画一个边框 边框颜色为Color.Gainsboro
g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);
g.Dispose();
//产生波形（Add By 51aspx.com）
image = TwistImage(image, true, 8, 4);
return image;
}
///
/// 生成随机字符码
///
/// 字符串长度
/// 中文字符数
///
public string CreateVerifyCode(int codeLen, int zhCharsCount)
{
char[] chs = new char[codeLen];
int index;
for (int i = 0; i < zhCharsCount; i++)
{
index = rnd.Next(0, codeLen);
if (chs[index] == '\0')
chs[index] = CreateZhChar();
else
--i;
}
for (int i = 0; i < codeLen; i++)
{
if (chs[i] == '\0')
chs[i] = CreateEnOrNumChar();
}
return new string(chs, 0, chs.Length);
}
///
/// 生成默认长度5的随机字符码
///
///
public string CreateVerifyCode()
{
return CreateVerifyCode(Length, 0);
}
///
/// 生成英文或数字字符
///
///
protected char CreateEnOrNumChar()
{
return EnglishOrNumChars[rnd.Next(0, EnglishOrNumChars.Length)];
}
///
/// 生成汉字字符
///
///
protected char CreateZhChar()
{
//若提供了汉字集，查询汉字集选取汉字
if (ChineseChars.Length > 0)
{
return ChineseChars[rnd.Next(0, ChineseChars.Length)];
}
//若没有提供汉字集，则根据《GB2312简体中文编码表》编码规则构造汉字
else
{
byte[] bytes = new byte[2];
//第一个字节值在0xb0, 0xf7之间
bytes[0] = (byte)rnd.Next(0xb0, 0xf8);
//第二个字节值在0xa1, 0xfe之间
bytes[1] = (byte)rnd.Next(0xa1, 0xff);
//根据汉字编码的字节数组解码出中文汉字
string str1 = Encoding.GetEncoding("gb2312").GetString(bytes);
return str1[0];
}
}
}
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