using System;
using System.Text;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.IO; //引用的命名控件
namespace AboutImages
{
/**//// <summary>
/// 生成随机验证码
/// </summary>
public sealed class VerifyCode
{
private Random rnd = new Random(unchecked((int)DateTime.Now.Ticks));
属性变量#region 属性变量
int fontSize = 30; //验证码大小
int padding = 2; //边框
bool chaos = true; //是否输出燥点(默认输出)
Color chaosColor = Color.LightGray; //噪点颜色
int chaoCount = 100;//噪点数量
Color backgroundColor = Color.White; //背景颜色
//颜色数组
Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
//字体数组
string[] fonts = { "Arial", "Georgia", "宋体", "黑体" };
#endregion
属性设置#region 属性设置
验证码字体大小(为了显示扭曲效果,默认40像素,可以自行修改)#region 验证码字体大小(为了显示扭曲效果,默认40像素,可以自行修改)
/**//// <summary>
/// 验证码字体大小(默认为40默认40像素)
/// </summary>
public int FontSize
{
get { return fontSize; }
set { fontSize = value; }
}
#endregion
边框像素#region 边框像素
/**//// <summary>
/// 边框像素(默认为2)
/// </summary>
public int Padding
{
get { return padding; }
set { padding = value; }
}
#endregion
是否输出燥点(默认输出)#region 是否输出燥点(默认输出)
/**//// <summary>
/// 是否输出燥点(默认为是)
/// </summary>
public bool Chaos
{
get { return chaos; }
set { chaos = value; }
}
#endregion
输出燥点的颜色(默认灰色)#region 输出燥点的颜色(默认灰色)
/**//// <summary>
/// 输出燥点的颜色(默认Color.LightGray)
/// </summary>
public Color ChaosColor
{
get { return chaosColor; }
set { chaosColor = value; }
}
#endregion
燥点数量#region 燥点数量
/**//// <summary>
/// 燥点数量(默认为100)
/// </summary>
public int ChaoCount
{
get { return chaoCount; }
set { chaoCount = value; }
}
#endregion
自定义背景色(默认白色)#region 自定义背景色(默认白色)
/**//// <summary>
/// 背景颜色,默认为白色
/// </summary>
public Color BackgroundColor
{
get { return backgroundColor; }
set { backgroundColor = value; }
}
#endregion
自定义随机颜色数组#region 自定义随机颜色数组
/**//// <summary>
/// 随机颜色数组Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple
/// </summary>
public Color[] Colors
{
get { return colors; }
set { colors = value; }
}
#endregion
自定义字体数组#region 自定义字体数组
/**//// <summary>
/// 字体数组"Arial", "Georgia", "宋体", "黑体"
/// </summary>
public string[] Fonts
{
get { return fonts; }
set { fonts = value; }
}
#endregion
#endregion
产生波形滤镜效果并画一个边框#region 产生波形滤镜效果并画一个边框
// <summary>
// 正弦曲线Wave扭曲图片(Edit By 51aspx.com)
// </summary>
// <param name="srcBmp">图片路径</param>
// <param name="bXDir">如果扭曲则选择为True</param>
// <param name="nMultValue">波形的幅度倍数,越大扭曲的程度越高,一般为3</param>
// <param name="dPhase">波形的起始相位,取值区间[0-2*PI)</param>
// <returns></returns>
private Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
{
//const double PI = 3.1415926535897932384626433832795;
const double PI2 = 6.283185307179586476925286766559;
Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
// 将位图背景填充为白色
Graphics g = System.Drawing.Graphics.FromImage(destBmp);
g.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);
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);
}
}
}
//渐变效果
//g.FillRectangle(new LinearGradientBrush(new Point(0, 0), new Point(destBmp.Width, destBmp.Height), Color.FromArgb(0, 0, 0, 0), Color.FromArgb(255, 255, 255, 255)), 0, 0, destBmp.Width, destBmp.Height);
//画边框
g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, destBmp.Width - 1, destBmp.Height - 1);
g.Dispose();
return destBmp;
}
#endregion
生成验证码码图片#region 生成验证码码图片
/**//// <summary>
/// 生成验证码图片
/// </summary>
/// <param name="code">验证码</param>
/// <returns>返回Bitmap</returns>
private Bitmap CreateImageCode(string code)
{
int fSize = FontSize + Padding; //字体大小
int imageWidth = (int)(code.Length * fSize) + 10 + Padding * 2;//图片宽度
int imageHeight = FontSize * 2 + Padding; //图片高度
Bitmap image = new Bitmap(imageWidth, imageHeight); //创建图像
Graphics g = Graphics.FromImage(image);
g.Clear(BackgroundColor); // 填充背景颜色
画图片的背景噪音线#region 画图片的背景噪音线
for (int i = 0; i < 25; i++)
{
int x1 = rnd.Next(image.Width);
int x2 = rnd.Next(image.Width);
int y1 = rnd.Next(image.Height);
int y2 = rnd.Next(image.Height);
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
#endregion
写入每一个字符#region 写入每一个字符
//定义位移(左右,上下)
int left = 0, top = 0, top1 = 1, top2 = 1;
int n1 = (imageHeight - FontSize - Padding * 2);
int n2 = n1 / 5;
top1 = n2;
top2 = n2 * 2;
Font f;
Brush b;
int cindex, findex;//颜色和字体
for (int i = 0; i < code.Length; i++)
{
cindex = rnd.Next(Colors.Length - 1);//从颜色数组中随机取出一个
findex = rnd.Next(Fonts.Length - 1); //从字体数组中随机取出一个
f = new Font(Fonts[findex], fSize, FontStyle.Bold);
b = new SolidBrush(Colors[cindex]);
if (i % 2 == 1)
{
top = top2;
}
else
{
top = top1;
}
//产生、随机移位
int sub;
sub = rnd.Next(4, 8);
if (sub > 5)
{
sub = -sub;
}
//---------
if (i != 0) //第一个字不位移
{
left = i * (FontSize + Padding) + sub;
top += sub;
}
//----------
g.DrawString(code.Substring(i, 1), f, b, left, top);
}
#endregion
生成随机噪点#region 生成随机噪点
if (chaos)
{
Pen pen = new Pen(ChaosColor, 0);
int c = chaoCount;
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);
}
}
#endregion
//g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
//画边框(因为后面还要做个波行效果,所以先不画边框
g.Dispose();
产生波形#region 产生波形
//随机生成后三个参数(true or false,5~8,(0~2PI),)
int _int1 = rnd.Next(4, 10);
int _int2 = rnd.Next(1, 6);
bool _bool = _int2 > 3 ? true : false;
image = TwistImage(image, _bool, _int1, _int2);
#endregion
return image;
}
#endregion
将创建好的图片输出到页面#region 将创建好的图片输出到页面
/**//// <summary>
/// 把字符图片输出到页面
/// </summary>
/// <param name="code">字符</param>
/// <param name="context">页面</param>
public void CreateImageOnPage(string code, HttpContext context)
{
System.IO.MemoryStream ms = new System.IO.MemoryStream();
Bitmap image = this.CreateImageCode(code);
image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
context.Response.ClearContent();
context.Response.ContentType = "image/Jpeg";
context.Response.BinaryWrite(ms.GetBuffer());
ms.Close();
ms = null;
image.Dispose();
image = null;
}
#endregion
}
}
效果图using System.Text;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.IO; //引用的命名控件
namespace AboutImages
{
/**//// <summary>
/// 生成随机验证码
/// </summary>
public sealed class VerifyCode
{
private Random rnd = new Random(unchecked((int)DateTime.Now.Ticks));
属性变量#region 属性变量
int fontSize = 30; //验证码大小
int padding = 2; //边框
bool chaos = true; //是否输出燥点(默认输出)
Color chaosColor = Color.LightGray; //噪点颜色
int chaoCount = 100;//噪点数量
Color backgroundColor = Color.White; //背景颜色
//颜色数组
Color[] colors = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple };
//字体数组
string[] fonts = { "Arial", "Georgia", "宋体", "黑体" };
#endregion
属性设置#region 属性设置
验证码字体大小(为了显示扭曲效果,默认40像素,可以自行修改)#region 验证码字体大小(为了显示扭曲效果,默认40像素,可以自行修改)
/**//// <summary>
/// 验证码字体大小(默认为40默认40像素)
/// </summary>
public int FontSize
{
get { return fontSize; }
set { fontSize = value; }
}
#endregion
边框像素#region 边框像素
/**//// <summary>
/// 边框像素(默认为2)
/// </summary>
public int Padding
{
get { return padding; }
set { padding = value; }
}
#endregion
是否输出燥点(默认输出)#region 是否输出燥点(默认输出)
/**//// <summary>
/// 是否输出燥点(默认为是)
/// </summary>
public bool Chaos
{
get { return chaos; }
set { chaos = value; }
}
#endregion
输出燥点的颜色(默认灰色)#region 输出燥点的颜色(默认灰色)
/**//// <summary>
/// 输出燥点的颜色(默认Color.LightGray)
/// </summary>
public Color ChaosColor
{
get { return chaosColor; }
set { chaosColor = value; }
}
#endregion
燥点数量#region 燥点数量
/**//// <summary>
/// 燥点数量(默认为100)
/// </summary>
public int ChaoCount
{
get { return chaoCount; }
set { chaoCount = value; }
}
#endregion
自定义背景色(默认白色)#region 自定义背景色(默认白色)
/**//// <summary>
/// 背景颜色,默认为白色
/// </summary>
public Color BackgroundColor
{
get { return backgroundColor; }
set { backgroundColor = value; }
}
#endregion
自定义随机颜色数组#region 自定义随机颜色数组
/**//// <summary>
/// 随机颜色数组Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Orange, Color.Brown, Color.DarkCyan, Color.Purple
/// </summary>
public Color[] Colors
{
get { return colors; }
set { colors = value; }
}
#endregion
自定义字体数组#region 自定义字体数组
/**//// <summary>
/// 字体数组"Arial", "Georgia", "宋体", "黑体"
/// </summary>
public string[] Fonts
{
get { return fonts; }
set { fonts = value; }
}
#endregion
#endregion
产生波形滤镜效果并画一个边框#region 产生波形滤镜效果并画一个边框
// <summary>
// 正弦曲线Wave扭曲图片(Edit By 51aspx.com)
// </summary>
// <param name="srcBmp">图片路径</param>
// <param name="bXDir">如果扭曲则选择为True</param>
// <param name="nMultValue">波形的幅度倍数,越大扭曲的程度越高,一般为3</param>
// <param name="dPhase">波形的起始相位,取值区间[0-2*PI)</param>
// <returns></returns>
private Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
{
//const double PI = 3.1415926535897932384626433832795;
const double PI2 = 6.283185307179586476925286766559;
Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
// 将位图背景填充为白色
Graphics g = System.Drawing.Graphics.FromImage(destBmp);
g.FillRectangle(new SolidBrush(System.Drawing.Color.White), 0, 0, destBmp.Width, destBmp.Height);
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);
}
}
}
//渐变效果
//g.FillRectangle(new LinearGradientBrush(new Point(0, 0), new Point(destBmp.Width, destBmp.Height), Color.FromArgb(0, 0, 0, 0), Color.FromArgb(255, 255, 255, 255)), 0, 0, destBmp.Width, destBmp.Height);
//画边框
g.DrawRectangle(new Pen(Color.Gainsboro, 0), 0, 0, destBmp.Width - 1, destBmp.Height - 1);
g.Dispose();
return destBmp;
}
#endregion
生成验证码码图片#region 生成验证码码图片
/**//// <summary>
/// 生成验证码图片
/// </summary>
/// <param name="code">验证码</param>
/// <returns>返回Bitmap</returns>
private Bitmap CreateImageCode(string code)
{
int fSize = FontSize + Padding; //字体大小
int imageWidth = (int)(code.Length * fSize) + 10 + Padding * 2;//图片宽度
int imageHeight = FontSize * 2 + Padding; //图片高度
Bitmap image = new Bitmap(imageWidth, imageHeight); //创建图像
Graphics g = Graphics.FromImage(image);
g.Clear(BackgroundColor); // 填充背景颜色
画图片的背景噪音线#region 画图片的背景噪音线
for (int i = 0; i < 25; i++)
{
int x1 = rnd.Next(image.Width);
int x2 = rnd.Next(image.Width);
int y1 = rnd.Next(image.Height);
int y2 = rnd.Next(image.Height);
g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
}
#endregion
写入每一个字符#region 写入每一个字符
//定义位移(左右,上下)
int left = 0, top = 0, top1 = 1, top2 = 1;
int n1 = (imageHeight - FontSize - Padding * 2);
int n2 = n1 / 5;
top1 = n2;
top2 = n2 * 2;
Font f;
Brush b;
int cindex, findex;//颜色和字体
for (int i = 0; i < code.Length; i++)
{
cindex = rnd.Next(Colors.Length - 1);//从颜色数组中随机取出一个
findex = rnd.Next(Fonts.Length - 1); //从字体数组中随机取出一个
f = new Font(Fonts[findex], fSize, FontStyle.Bold);
b = new SolidBrush(Colors[cindex]);
if (i % 2 == 1)
{
top = top2;
}
else
{
top = top1;
}
//产生、随机移位
int sub;
sub = rnd.Next(4, 8);
if (sub > 5)
{
sub = -sub;
}
//---------
if (i != 0) //第一个字不位移
{
left = i * (FontSize + Padding) + sub;
top += sub;
}
//----------
g.DrawString(code.Substring(i, 1), f, b, left, top);
}
#endregion
生成随机噪点#region 生成随机噪点
if (chaos)
{
Pen pen = new Pen(ChaosColor, 0);
int c = chaoCount;
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);
}
}
#endregion
//g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
//画边框(因为后面还要做个波行效果,所以先不画边框
g.Dispose();
产生波形#region 产生波形
//随机生成后三个参数(true or false,5~8,(0~2PI),)
int _int1 = rnd.Next(4, 10);
int _int2 = rnd.Next(1, 6);
bool _bool = _int2 > 3 ? true : false;
image = TwistImage(image, _bool, _int1, _int2);
#endregion
return image;
}
#endregion
将创建好的图片输出到页面#region 将创建好的图片输出到页面
/**//// <summary>
/// 把字符图片输出到页面
/// </summary>
/// <param name="code">字符</param>
/// <param name="context">页面</param>
public void CreateImageOnPage(string code, HttpContext context)
{
System.IO.MemoryStream ms = new System.IO.MemoryStream();
Bitmap image = this.CreateImageCode(code);
image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
context.Response.ClearContent();
context.Response.ContentType = "image/Jpeg";
context.Response.BinaryWrite(ms.GetBuffer());
ms.Close();
ms = null;
image.Dispose();
image = null;
}
#endregion
}
}
//BinaryImg.aspx 后台代码
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
AboutImages.VerifyCode v = new AboutImages.VerifyCode();
//v.BackgroundColor = System.Drawing.Color.White;
//v.ChaoCount = 100;
//v.Chaos = true;
//v.Colors={System.Drawing.Color.Wheat,System.Drawing.Color.Red,..};
//v.Fonts = new string[] { "宋体", "黑体", "Arial" };
//v.FontSize = 40;
//v.Padding = 1;
v.CreateImageOnPage("123456", HttpContext.Current);
}
}
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
AboutImages.VerifyCode v = new AboutImages.VerifyCode();
//v.BackgroundColor = System.Drawing.Color.White;
//v.ChaoCount = 100;
//v.Chaos = true;
//v.Colors={System.Drawing.Color.Wheat,System.Drawing.Color.Red,..};
//v.Fonts = new string[] { "宋体", "黑体", "Arial" };
//v.FontSize = 40;
//v.Padding = 1;
v.CreateImageOnPage("123456", HttpContext.Current);
}
}