public byte[] GenerateImage(out string code, int codeLength = 4)
{
//验证码
code = RandomTool.CreatRandom58String(codeLength);
//Bitmap img = null;
//Graphics g = null;
var random = new Random();
//验证码颜色集合
Color[] c =
{
Color.Black,
Color.Red,
Color.DarkBlue,
Color.Green,
Color.Orange,
Color.Brown,
Color.DarkCyan,
Color.Purple,
Color.Yellow,
Color.Cyan
};
//验证码字体集合
string[] fonts = { "Verdana", "Microsoft Sans Serif", "Comic Sans MS", "Arial", "宋体" };
byte[] imageBytes;
using (var ms = new MemoryStream())
using (var img = new Bitmap(code.Length * 40, 64))
{
using (var g = Graphics.FromImage(img))
{
g.Clear(Color.White);//背景设为白色
//验证码绘制在g中
for (int i = 0; i < code.Length; i++)
{
var cindex = random.Next(7); //随机颜色索引值
var findex = random.Next(5); //随机字体索引值
Font font = new Font(fonts[findex], 15, FontStyle.Bold); //字体
Brush brush = new SolidBrush(c[cindex]); //颜色
//产生一个轻微的抖动
int shakeX = random.Next(0, 5);
int shakeY = random.Next(0, 10);
float x = 3 + (i * 30) + shakeX; //x坐标
float y = 0 + shakeY; //Y坐标
string character = code.Substring(i, 1); //绘制的字符
g.DrawString(character, font, brush, x, y); //绘制一个验证字符
}
//在随机位置画背景点
for (int i = 0; i < 5; i++)
{
var cindex = random.Next(7);//随机颜色索引值
int x = random.Next(img.Width);
int y = random.Next(img.Height);
using (var pen = new Pen(c[cindex], 2))
{
g.DrawRectangle(pen: pen, x: x, y: y, width: 1, height: 1);
}
}
//随机线条
for (int i = 0; i < 2; i++)
{
var cindex = random.Next(9);//随机颜色索引值
int x1 = random.Next(img.Width);
int y1 = random.Next(img.Height);
int x2 = random.Next(img.Width);
int y2 = random.Next(img.Height);
using (var pen = new Pen(c[cindex], 2))
{
g.DrawLine(pen: pen, x1: x1, y1: y1, x2: x2, y2: y2);
}
}
img.Save(ms, ImageFormat.Jpeg);//将此图像以Png图像文件的格式保存到流中
imageBytes = ms.ToArray();
}
}
return(imageBytes);
}
public byte[] GenerateImage(out string code, int codeLength = 4)
{
//验证码
code = RandomTool.CreatRandom58String(codeLength);
var random = new Random();
//验证码颜色集合
Color[] colorArray =
{
Color.Black,
Color.Red,
Color.DarkBlue,
Color.Green,
Color.Orange,
Color.Brown,
Color.DarkCyan,
Color.Purple,
Color.Yellow,
Color.Cyan
};
//验证码字体集合
string[] fonts = { "fonts/Apalu-2.ttf",
"fonts/Arvo-Italic.ttf",
"fonts/brelaregular.ttf",
"fonts/ColorTube-2.ttf",
"fonts/LeagueGothic-Italic.ttf",
"fonts/Quantum-2.ttf" };
var width = code.Length * 40;
var height = 64;
byte[] buffer = null;
using (MemoryStream ms = new MemoryStream())
using (Image image = new Image <Rgba32>(width, height, Color.White))
{
//绘制干扰线条
for (int i = 0; i < 2; i++)
{
var cindex = random.Next(9);//随机颜色索引值
int x1 = random.Next(image.Width);
int y1 = random.Next(image.Height);
int x2 = random.Next(image.Width);
int y2 = random.Next(image.Height);
int x3 = random.Next(image.Width);
int y3 = random.Next(image.Height);
int x4 = random.Next(image.Width);
int y4 = random.Next(image.Height);
int x5 = random.Next(image.Width);
int y5 = random.Next(image.Height);
var thickness = random.Next(2, 4);
var linerSegemnt = new LinearLineSegment(
new Vector2(x1, y1),
new Vector2(x2, y2),
new Vector2(x3, y3),
new Vector2(x4, y4),
new Vector2(x5, y5)
);
var color = colorArray[cindex];
var p = new SixLabors.ImageSharp.Drawing.Path(linerSegemnt);
image.Mutate(x => x.Draw(color, thickness, p));
}
//绘制文字
for (int i = 0; i < code.Length; i++)
{
var cindex = random.Next(7); //随机颜色索引值
var findex = random.Next(6); //随机字体索引值
var fontSize = random.Next(35, 50);
FontCollection collection = new();
FontFamily family = collection.Add(fonts[findex]);
Font font = family.CreateFont(fontSize);
Color selectColor = colorArray[cindex];
//产生一个轻微的抖动
int shakeX = random.Next(-5, 15);
int shakeY = random.Next(-5, 25);
float x = 3 + (i * 30) + shakeX; //x坐标
float y = 0 + shakeY; //Y坐标
string character = code.Substring(i, 1); //绘制的字符
image.Mutate(opera => opera.DrawText(character, font, selectColor, new PointF(x, y)));
}
//在随机位置画背景点
for (int i = 0; i < 5; i++)
{
var cindex = random.Next(7);//随机颜色索引值
int x = random.Next(image.Width);
int y = random.Next(image.Height);
}
//绘制干扰点
for (int i = 0; i < 40; i++)
{
var cindex = random.Next(7);//随机颜色索引值
int x = random.Next(image.Width);
int y = random.Next(image.Height);
var rectangle = new Rectangle(x, y, 1, 1);
var coloer = colorArray[cindex];
image.Mutate(x => x.Draw(coloer, 4f, rectangle));
}
image.SaveAsBmp(ms);
buffer = ms.ToArray();
}
return(buffer);
}
