/// <summary>
/// 获取验证码图片
/// </summary>
/// <returns></returns>
protected Bitmap GetVerifyCodeImage()
{
this.GetVerifyCodeText();
Bitmap bitmap = new Bitmap(ImgWidth, ImgHeight);
using (Graphics graphics = Graphics.FromImage(bitmap))
{
graphics.SmoothingMode = SmoothingMode.HighQuality;
//清除整个绘图面并以指定背景色填充
graphics.Clear(this.BackgroundColor);
//创建画笔
using (SolidBrush brush = new SolidBrush(this.IsRandomColor?GetRandomColor():this.FontColor))
{
this.AddForeNoisePoint(bitmap);
this.AddBackgroundNoisePoint(bitmap, graphics);
//文字居中
StringFormat stringFormat = new StringFormat(StringFormatFlags.NoClip);
stringFormat.Alignment = StringAlignment.Center;
stringFormat.LineAlignment = StringAlignment.Center;
//字体样式
Font font = new Font(this.FontFamily, RandomBuilder.GenerateInt(this.FontSize - 3, this.FontSize), FontStyle.Regular);
//验证码旋转，防止机器识别
char[] chars = this.VerifyCodeText.ToCharArray();
for (int i = 0; i < chars.Length; i++)
{
//转动的角度
float angle = RandomBuilder.GenerateInt(-this.RandomAngle, this.RandomAngle);
graphics.TranslateTransform(12, 12);
graphics.RotateTransform(angle);
graphics.DrawString(chars[i].ToString(), font, brush, -2, 2, stringFormat);
graphics.RotateTransform(-angle);
graphics.TranslateTransform(2, -12);
}
}
}
return(bitmap);
}
public void TestGenerateInt()
{
int?old = null;
for (int i = 0; i < 100; i++)
{
var result = _builder.GenerateInt(100);
Assert.IsTrue(old != result, "!=");
Assert.IsTrue(result >= 0, ">=0");
Assert.IsTrue(result <= 100, "<=100");
}
}
