/// <summary>
/// 获取指定字符串的验证码图片
/// </summary>
/// <param name="code">验证码</param>
/// <returns></returns>
public Bitmap CreateImage(string code)
{
code.CheckNotNullOrEmpty(nameof(code));
var width = FontWidth * code.Length + FontWidth;
var height = FontSize + FontSize / 2;
const int flag = 255 / 2;
bool isBgLight = (Background.R + Background.G + Background.B) / 3 > flag;
Bitmap image = new Bitmap(width, height);
Graphics graphics = Graphics.FromImage(image);
graphics.Clear(Background);
Brush brush = new SolidBrush(Color.FromArgb(255 - Background.R, 255 - Background.G, 255 - Background.B));
int x, y = 3;
if (HasBorder)
{
graphics.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);
}
Random rnd = Random;
// 绘制干扰线
for (var i = 0; i < RandomLineCount; i++)
{
x = rnd.Next(image.Width);
y = rnd.Next(image.Height);
int m = rnd.Next(image.Width);
int n = rnd.Next(image.Height);
Color lineColor = !RandomColor
? Color.FromArgb(90, 90, 90)
: isBgLight
? Color.FromArgb(rnd.Next(130, 200), rnd.Next(130, 200), rnd.Next(130, 200))
: Color.FromArgb(rnd.Next(70, 150), rnd.Next(70, 150), rnd.Next(70, 150));
Pen pen = new Pen(lineColor, 2);
graphics.DrawLine(pen, x, y, m, n);
}
// 绘制干扰点
for (var i = 0; i < (int)(image.Width * image.Height * RandomPointPercent / 100); i++)
{
x = rnd.Next(image.Width);
y = rnd.Next(image.Height);
Color pointColor = isBgLight
? Color.FromArgb(rnd.Next(30, 80), rnd.Next(30, 80), rnd.Next(30, 80))
: Color.FromArgb(rnd.Next(150, 200), rnd.Next(150, 200), rnd.Next(150, 200));
image.SetPixel(x, y, pointColor);
}
// 绘制文字
for (var i = 0; i < code.Length; i++)
{
rnd = Random;
x = FontWidth / 4 + FontWidth * i;
if (RandomPosition)
{
x = rnd.Next(FontWidth / 4) + FontWidth * i;
y = rnd.Next(image.Flags / 5);
}
PointF point = new PointF(x, y);
if (RandomColor)
{
int r, g, b;
if (!isBgLight)
{
r = rnd.Next(255 - Background.R);
g = rnd.Next(255 - Background.G);
b = rnd.Next(255 - Background.B);
if ((r + g + b) / 3 < flag)
{
r = 255 - r;
g = 255 - g;
b = 255 - b;
}
}
else
{
r = rnd.Next(Background.R);
g = rnd.Next(Background.G);
b = rnd.Next(Background.B);
if ((r + g + b) / 3 > flag)
{
r = 255 - r;
g = 255 - g;
b = 255 - b;
}
}
brush = new SolidBrush(Color.FromArgb(r, g, b));
}
var fontName = Valid.IsContainsChinese(code)
? FontNamesForChinese[rnd.Next(FontNamesForChinese.Count)]
: FontNames[rnd.Next(FontNames.Count)];
var font = new Font(fontName, FontSize, FontStyle.Bold);
if (RandomItalic)
{
graphics.TranslateTransform(0, 0);
Matrix transform = graphics.Transform;
transform.Shear(Convert.ToSingle(rnd.Next(2, 9) / 10d - 0.5), 0.001f);
graphics.Transform = transform;
}
graphics.DrawString(code.Substring(i, 1), font, brush, point);
graphics.ResetTransform();
}
return(image);
}
/// <summary>
/// 获取汉字的全拼，范例：中国，返回zhongguo
/// </summary>
/// <param name="text">汉字文本，范例：中国</param>
/// <returns></returns>
public static string ConvertPinYin(string text)
{
byte[] arr = new byte[2];
string pyStr = "";
int asc = 0, M1 = 0, M2 = 0;
char[] mChar = text.ToCharArray();//获取汉字对应的字符数组
for (int i = 0; i < mChar.Length; i++)
{
//如果输入的是汉字
if (Valid.IsContainsChinese(mChar[i].ToString()))
{
arr = Encoding.Default.GetBytes(mChar[i].ToString());
M1 = (short)(arr[0]);
M2 = (short)(arr[1]);
asc = M1 * 256 + M2 - 65536;
if (asc > 0 && asc < 160)
{
pyStr += mChar[i];
}
else
{
switch (asc)
{
case -9254:
pyStr += "Zhen"; break;
case -8985:
pyStr += "Qian"; break;
case -5463:
pyStr += "Jia"; break;
case -8274:
pyStr += "Ge"; break;
case -5448:
pyStr += "Ga"; break;
case -5447:
pyStr += "La"; break;
case -4649:
pyStr += "Chen"; break;
case -5436:
pyStr += "Mao"; break;
case -5213:
pyStr += "Mao"; break;
case -3597:
pyStr += "Die"; break;
case -5659:
pyStr += "Tian"; break;
default:
for (int j = (Const.SpellCode.Length - 1); j >= 0; j--)
{
if (Const.SpellCode[j] <= asc)
{
//判断汉字的拼音区编码是否在指定范围内
pyStr += Const.SpellLetter[j]; //如果不超出范围则获取对应的拼音
break;
}
}
break;
}
}
}
else
{
//如果不是汉字则返回
pyStr += mChar[i].ToString();
}
}
return(pyStr);
}
