/// <summary>
/// 生成
/// </summary>
/// <param name="option"></param>
/// <returns></returns>
public Bitmap RenderImage(ValidateImageOptions option, string code)
{
Bitmap bitmap = new Bitmap(option.Width, option.Height, PixelFormat.Format24bppRgb);
using (Graphics graphics = Graphics.FromImage(bitmap))
{
graphics.SmoothingMode = SmoothingMode.AntiAlias;
graphics.Clear(Color.White);
int num = 0;
double num2 = (double)(option.Width / option.CodeLength);
for (int i = 0; i < code.Length; i++)
{
char c = code[i];
using (Font font = this.GetFont(option))
{
using (Brush brush = new SolidBrush(this.GetRandomColor()))
{
Rectangle rectangle = new Rectangle(Convert.ToInt32((double)num * num2), 0, Convert.ToInt32(num2), option.Height);
GraphicsPath graphicsPath = TextPath(c.ToString(), font, rectangle);
WarpText(option, graphicsPath, rectangle);
graphics.FillPath(brush, graphicsPath);
num++;
}
}
}
Rectangle rect = new Rectangle(new Point(0, 0), bitmap.Size);
this.AddNoise(graphics, rect);
this.AddLine(option, graphics, rect);
}
return(bitmap);
}
/// <summary>
/// 获取随机字体
/// </summary>
/// <param name="option"></param>
/// <returns></returns>
private Font GetFont(ValidateImageOptions option)
{
string randomFontFamily = this.GetRandomFontFamily();
float emSize;
switch (this.Options.FontWarp)
{
case Level.Low:
emSize = Convert.ToInt32(option.Height * 0.8);
break;
case Level.Medium:
emSize = Convert.ToInt32(option.Height * 0.85);
break;
case Level.High:
emSize = Convert.ToInt32(option.Height * 0.9);
break;
case Level.Extreme:
emSize = Convert.ToInt32(option.Height * 0.95);
break;
default:
emSize = Convert.ToInt32(option.Height * 0.7);
break;
}
return(new Font(randomFontFamily, emSize, FontStyle.Bold));
}
/// <summary>
/// 添加杂线
/// </summary>
/// <param name="option"></param>
/// <param name="g"></param>
/// <param name="rect"></param>
private void AddLine(ValidateImageOptions option, Graphics g, Rectangle rect)
{
int pointCount; //端点数
int lineCount; //线条数
float width;
switch (this.Options.LineNoise)
{
case Level.Low:
{
pointCount = 4;
width = Convert.ToSingle(option.Height / 31.25);
lineCount = 1;
break;
}
case Level.Medium:
{
pointCount = 5;
width = Convert.ToSingle(option.Height / 27.7777);
lineCount = 1;
break;
}
case Level.High:
{
pointCount = 3;
width = Convert.ToSingle(option.Height / 25);
lineCount = 2;
break;
}
case Level.Extreme:
{
pointCount = 3;
width = Convert.ToSingle((double)option.Height / 22.7272);
lineCount = 3;
break;
}
default:
return;
}
PointF[] array = new PointF[pointCount + 1];
using (Pen pen = new Pen(this.GetRandomColor(), width))
{
for (int i = 1; i <= lineCount; i++)
{
for (int j = 0; j <= pointCount; j++)
{
array[j] = this.RandomPoint(rect);
}
g.DrawCurve(pen, array, 1.75f);
}
}
}
/// <summary>
/// 扭曲图形
/// </summary>
/// <param name="option"></param>
/// <param name="textPath"></param>
/// <param name="rect"></param>
private void WarpText(ValidateImageOptions option, GraphicsPath textPath, Rectangle rect)
{
float num;
float num2;
switch (this.Options.FontWarp)
{
case Level.Low:
num = 6f;
num2 = 1f;
break;
case Level.Medium:
num = 5f;
num2 = 1.3f;
break;
case Level.High:
num = 4.5f;
num2 = 1.4f;
break;
case Level.Extreme:
num = 4f;
num2 = 1.5f;
break;
default:
return;
}
RectangleF srcRect = new RectangleF(Convert.ToSingle(rect.Left), 0f, Convert.ToSingle(rect.Width), (float)rect.Height);
int num3 = Convert.ToInt32((float)rect.Height / num);
int num4 = Convert.ToInt32((float)rect.Width / num);
int num5 = rect.Left - Convert.ToInt32((float)num4 * num2);
int num6 = rect.Top - Convert.ToInt32((float)num3 * num2);
int num7 = rect.Left + rect.Width + Convert.ToInt32((float)num4 * num2);
int num8 = rect.Top + rect.Height + Convert.ToInt32((float)num3 * num2);
if (num5 < 0)
{
num5 = 0;
}
if (num6 < 0)
{
num6 = 0;
}
if (num7 > option.Width)
{
num7 = option.Width;
}
if (num8 > option.Height)
{
num8 = option.Height;
}
PointF pointF = this.RandomPoint(num5, num5 + num4, num6, num6 + num3);
PointF pointF2 = this.RandomPoint(num7 - num4, num7, num6, num6 + num3);
PointF pointF3 = this.RandomPoint(num5, num5 + num4, num8 - num3, num8);
PointF pointF4 = this.RandomPoint(num7 - num4, num7, num8 - num3, num8);
PointF[] destPoints = new PointF[]
{
pointF,
pointF2,
pointF3,
pointF4
};
Matrix matrix = new Matrix();
matrix.Translate(0f, 0f);
textPath.Warp(destPoints, srcRect, matrix, WarpMode.Perspective, 0f);
}