/// <summary>
/// 生成验证码图片
/// </summary>
public void CreateImage()
{
int int_ImageWidth = (int)Math.Ceiling(this.codeStr.Length * letterWidth * 1.1);
int int_ImageHeight = (int)Math.Ceiling(letterHeight * 1.1) + 8;
image = new Bitmap(int_ImageWidth, int_ImageHeight);
Graphics g = Graphics.FromImage(image);
try
{
g.Clear(Color.White);
//画噪线
for (int i = 0; i < noiseNumber; i++)
{
int x1 = RandHelper.GetRandomInt(image.Width - 1);
int x2 = RandHelper.GetRandomInt(image.Width - 1);
int y1 = RandHelper.GetRandomInt(image.Height - 1);
int y2 = RandHelper.GetRandomInt(image.Height - 1);
Color clr = color[RandHelper.GetRandomInt(color.Length)];
g.DrawLine(new Pen(clr), x1, y1, x2, y2);
}
float int_x = 0;
//画验证码字符串
for (int i = 0; i < this.codeStr.Length; i++)
{
int_x += RandHelper.GetRandomInt(3);
string fnt = font[RandHelper.GetRandomInt(font.Length)];
Font ft = new Font(fnt, RandHelper.GetRandomInt(letterHeight - 1, letterHeight + 2));
Color clr = color[RandHelper.GetRandomInt(color.Length)];
g.DrawString(this.codeStr[i].ToString(), ft, new SolidBrush(clr), int_x, 0);
int_x += letterWidth;
}
//画噪点
for (int i = 0; i < 100; i++)
{
int x = RandHelper.GetRandomInt(image.Width);
int y = RandHelper.GetRandomInt(image.Height);
Color clr = color[RandHelper.GetRandomInt(color.Length)];
image.SetPixel(x, y, clr);
}
}
finally
{
//显式释放资源
g.Dispose();
}
}
/// <summary>
/// 生成验证码字符串
/// </summary>
public void GenerateVerifyCode()
{
switch (codeType)
{
case VerifyCodeType.Normal:
default:
codeStr = RandHelper.GetRandomStr(letterLimit, true);
CodeStr = codeStr;
break;
case VerifyCodeType.PlusAndMinus:
int intFirst = RandHelper.GetRandomInt(1, letterLimit);
int intSec = RandHelper.GetRandomInt(1, letterLimit);
int intIs = RandHelper.GetRandomInt(2);
switch (intIs)
{
case 1:
if (intFirst < intSec)
{
int intTemp = intFirst;
intFirst = intSec;
intSec = intTemp;
}
codeStr = intFirst + "-" + intSec + "=";
CodeStr = (intFirst - intSec).ToString();
break;
default:
codeStr = intFirst + "+" + intSec + "=";
CodeStr = (intFirst + intSec).ToString();
break;
}
codeStr = RandHelper.GetRandomStr(letterLimit, true);
break;
}
}