/// <summary>
/// 生成校验码图片。
/// </summary>
/// <param name="code">验证码文本。</param>
/// <returns></returns>
public static System.Drawing.Bitmap GenerateVerifyCodeImage(string code)
{
int fSize = VerifyCode.FontSize;
int iPadding = VerifyCode.Padding;
int fWidth = fSize + iPadding;
int imageWidth = code.Length * fWidth + iPadding * 2 + fWidth;
int imageHeight = fSize * 2 + iPadding;
System.Drawing.Bitmap image = new System.Drawing.Bitmap(imageWidth, imageHeight);
System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(image);
g.Clear(VerifyCode.BackColor);
System.Random rand = new System.Random();
int left, top, top1, top2;
int n1 = (imageHeight - fSize - iPadding * 2);
int n2 = n1 / 4;
top1 = n2;
top2 = n2 * 2;
System.Drawing.Font f;
System.Drawing.Brush b;
int cindex, findex;
#region 随机字体和颜色的验证码字符
cindex = rand.Next(ForeColors.Length);
for (int i = 0; i < code.Length; i++)
{
findex = rand.Next(Fonts.Length);
f = new System.Drawing.Font(Fonts[findex], fSize, System.Drawing.FontStyle.Bold);
b = new System.Drawing.SolidBrush(ForeColors[cindex]);
if (i % 2 == 1)
{
top = top2;
}
else
{
top = top1;
}
left = i * fWidth;
g.DrawString(code.Substring(i, 1), f, b, left, top);
}
#endregion
//#region 给背景添加随机生成的燥点
//if (VerifyCode.HasPinto && VerifyCode.Pinto > 0)
//{
// //System.Drawing.Pen pen = new System.Drawing.Pen(System.Drawing.Color.LightGray, 0);
// System.Drawing.Pen pen = new System.Drawing.Pen(VerifyCode.BackColor, 0);
// int c = System.Convert.ToInt32(image.Width * image.Height * VerifyCode.Pinto);
// for (int i = 0; i < c; i++)
// {
// int x = rand.Next(image.Width);
// int y = rand.Next(image.Height);
// g.DrawRectangle(pen, x, y, 1, 1);
// }
//}
//#endregion
//画一个边框 边框颜色为Color.Gainsboro
//g.DrawRectangle(new System.Drawing.Pen(System.Drawing.Color.Gainsboro, 0), 0, 0, image.Width - 1, image.Height - 1);
g.Dispose();
//产生波形
if (VerifyCode.BendingAngle != 0)
{
image = VerifyCode.TwistImage(image, VerifyCode.BackColor, true, VerifyCode.BendingAngle, 4);
}
DrawCurve(image, VerifyCode.ForeColors[rand.Next(0, VerifyCode.ForeColors.Length)]);
return(image);
}
