C# net6使用ImageSharp绘图并展示
目录
- winform实现
-
- 1.新建窗体程序，使用net 6框架
- 2.使用Nuget安装相关程序包，SixLabors.ImageSharp和SixLabors.ImageSharp.Drawing(这个使用的是预发行版)
- 3.在项目根目录中放置字体文件（*.ttf,设置文件属性—复制到输出目录—始终复制）
- 4.在项目根目录中新建文件保存路径
- 5.主要生成代码
- blazor server实现
-
- 1.新建Blazor Server项目
- 2.使用Nuget安装相关程序包，SixLabors.ImageSharp和SixLabors.ImageSharp.Drawing(这个使用的是预发行版)
- 3.在wwwroot中放置字体文件
- 4.修改Index.razor文件，准备实现生成图片，字体按照相对路径可以进行寻找
- 5.可以正常保存，生成相关图片
- blazor webAssembly 实现
-
- 1.新建项目
- 2.使用Nuget安装相关程序包，SixLabors.ImageSharp和SixLabors.ImageSharp.Drawing(这个使用的是预发行版)
- 3.在wwwroot中放置字体文件
- 4.修改Index.razor文件，准备实现生成图片，同样的代码，使用上面的那种方式，总是找不到路径，不太理解其运行机制。
研究这个的最初目的是，使用net 6做blazor网站，希望在登录界面实现验证码生成功能，因一直找不到字体文件，所以切换项目实验一下。
winform实现
1.新建窗体程序，使用net 6框架
2.使用Nuget安装相关程序包，SixLabors.ImageSharp和SixLabors.ImageSharp.Drawing(这个使用的是预发行版)
3.在项目根目录中放置字体文件（*.ttf,设置文件属性—复制到输出目录—始终复制）
4.在项目根目录中新建文件保存路径
5.主要生成代码
private void button1_Click(object sender, EventArgs e)
{
pictureBox1.Image = null;
int codeW = 100;
int codeH = 36;
int fontSize = 32;
string chkCode = string.Empty;
SixLabors.ImageSharp.Color[] color = { SixLabors.ImageSharp.Color.Black, SixLabors.ImageSharp.Color.Red, SixLabors.ImageSharp.Color.Blue, SixLabors.ImageSharp.Color.Green, SixLabors.ImageSharp.Color.Orange, SixLabors.ImageSharp.Color.Brown, SixLabors.ImageSharp.Color.DarkBlue };
//string[] font = { "Times New Roman" };
//需要将字体放到项目中
string[] fonts = { "Arial.ttf" };
char[] character = { '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'd', 'e', 'f', 'h', 'k', 'm', 'n', 'r', 'x', 'y', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'R', 'S', 'T', 'W', 'X', 'Y' };
//生成验证码字符串
Random rnd = new Random();
for (int i = 0; i < 4; i++)
{
chkCode += character[rnd.Next(character.Length)];
}
//写入Session用于验证码校验，可以对校验码进行加密，提高安全性
//System.Web.HttpContext.Current.Session["verifyCode"] = chkCode;
try
{
//创建画布
var image = new Image<Rgba32>(codeW, codeH);
image.Mutate(x => x.BackgroundColor(SixLabors.ImageSharp.Color.White));
//Bitmap bmp = new Bitmap(codeW, codeH - 3);
//Graphics g = Graphics.FromImage(bmp);
//填充背景颜色为白色
//g.Clear(Color.White);
//画噪线
for (int i = 0; i < 3; i++)
{
int x1 = rnd.Next(codeW);
int y1 = rnd.Next(codeH);
int x2 = rnd.Next(codeW);
int y2 = rnd.Next(codeH);
image.Mutate(x => x
//画实线
.DrawLines(
color[rnd.Next(color.Length)], //字体颜色
1, //字体大小
new SixLabors.ImageSharp.PointF[]{
new Vector2(x1, y1),
new Vector2(x2, y2)
} //两点一线坐标
));
//Color clr = color[rnd.Next(color.Length)];
//g.DrawLine(new Pen(clr), x1, y1, x2, y2);
}
//画验证码
//string bPath = $"{Directory.GetCurrentDirectory()}font/";
//string bPath = "C:\\Windows\\Fonts";
for (int i = 0; i < chkCode.Length; i++)
{
string fnt = fonts[rnd.Next(fonts.Length)];
//var install_Family = new FontCollection().Add(System.IO.Path.Combine(bPath, fnt));
var fontTmp = new FontCollection();
//var bPath = Environment.CurrentDirectory;
//var install_Family = fontTmp.Add($"font/ARIAL.TTF");
//var install_Family = fontTmp.Add($"ARIAL.TTF");
var install_Family = fontTmp.Add($"./font/Arial.ttf");
//var install_Family = fontTmp.Add($"C:/Windows/Fonts/ARIAL.TTF");
//var install_Family = fontTmp.Add($"C:/Windows/Fonts/Arial/ARIAL.TTF");
var font = new SixLabors.Fonts.Font(install_Family, fontSize);
image.Mutate(x => x
.DrawText(
chkCode[i].ToString(), //文字内容
font,
color[rnd.Next(color.Length)],
new Vector2((float)i * 20, (float)0))
);
//将文字写到画布上
//Font ft = new Font(fnt, fontSize);
// Color clr = color[rnd.Next(color.Length)];
// g.DrawString(chkCode[i].ToString(), ft, new SolidBrush(clr), (float)i * 18, (float)0);
}
//画图片的前景噪音点
for (int i = 0; i < 15; i++)
{
int x1 = rnd.Next(codeW);
int y1 = rnd.Next(codeH);
int x2 = x1 + 2;
int y2 = y1 + 2;
image.Mutate(x => x
//画实线
.DrawLines(
color[rnd.Next(color.Length)], //字体颜色
2, //字体大小
new SixLabors.ImageSharp.PointF[]{
new Vector2(x1, y1),
new Vector2(x2, y2)
} //两点一线坐标
));
}
//SixLabors.ImageSharp.Formats.Png.PngTextData
//IImageFormat bFormat = new Formats;
//ImgStr = image.ToBase64String(SixLabors.ImageSharp.Formats.Png.PngFormat.Instance);
image.SaveAsJpeg($"./img/test.jpg");
System.Drawing.Image bImg = System.Drawing.Image.FromFile($"./img/test.jpg");
pictureBox1.Image = bImg;
}
catch (Exception ex)
{
string aMsg = ex.Message;
}
}
blazor server实现
1.新建Blazor Server项目
2.使用Nuget安装相关程序包，SixLabors.ImageSharp和SixLabors.ImageSharp.Drawing(这个使用的是预发行版)
3.在wwwroot中放置字体文件
4.修改Index.razor文件，准备实现生成图片，字体按照相对路径可以进行寻找
@page "/"
@using SixLabors.Fonts;
@using SixLabors.ImageSharp.Drawing.Processing;
@using System.Numerics;
<PageTitle>ImageSharp生成图片</PageTitle>
<button @onclick=CreateImg>生成图片</button>
<img src="@ImgStr"/>
<div>@Yzm</div>
@code{
public string ImgStr;
public string Yzm;
public void CreateImg()
{
int codeW = 100;
int codeH = 36;
int fontSize = 32;
string chkCode = string.Empty;
SixLabors.ImageSharp.Color[] color = { SixLabors.ImageSharp.Color.Black, SixLabors.ImageSharp.Color.Red, SixLabors.ImageSharp.Color.Blue, SixLabors.ImageSharp.Color.Green, SixLabors.ImageSharp.Color.Orange, SixLabors.ImageSharp.Color.Brown, SixLabors.ImageSharp.Color.DarkBlue };
//string[] font = { "Times New Roman" };
//需要将字体放到项目中
string[] fonts = { "Arial.ttf" };
char[] character = { '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'd', 'e', 'f', 'h', 'k', 'm', 'n', 'r', 'x', 'y', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'R', 'S', 'T', 'W', 'X', 'Y' };
//生成验证码字符串
Random rnd = new Random();
for (int i = 0; i < 4; i++)
{
chkCode += character[rnd.Next(character.Length)];
}
//写入Session用于验证码校验，可以对校验码进行加密，提高安全性
//System.Web.HttpContext.Current.Session["verifyCode"] = chkCode;
try
{
//创建画布
var image = new Image<Rgba32>(codeW, codeH);
image.Mutate(x => x.BackgroundColor(SixLabors.ImageSharp.Color.White));
//Bitmap bmp = new Bitmap(codeW, codeH - 3);
//Graphics g = Graphics.FromImage(bmp);
//填充背景颜色为白色
//g.Clear(Color.White);
//画噪线
for (int i = 0; i < 3; i++)
{
int x1 = rnd.Next(codeW);
int y1 = rnd.Next(codeH);
int x2 = rnd.Next(codeW);
int y2 = rnd.Next(codeH);
image.Mutate(x => x
//画实线
.DrawLines(
color[rnd.Next(color.Length)], //字体颜色
1, //字体大小
new SixLabors.ImageSharp.PointF[]{
new Vector2(x1, y1),
new Vector2(x2, y2)
} //两点一线坐标
));
//Color clr = color[rnd.Next(color.Length)];
//g.DrawLine(new Pen(clr), x1, y1, x2, y2);
}
//画验证码
//string bPath = $"{Directory.GetCurrentDirectory()}font/";
//string bPath = "C:\\Windows\\Fonts";
for (int i = 0; i < chkCode.Length; i++)
{
string fnt = fonts[rnd.Next(fonts.Length)];
//var install_Family = new FontCollection().Add(System.IO.Path.Combine(bPath, fnt));
var fontTmp = new FontCollection();
//var bPath = Environment.CurrentDirectory;
//var install_Family = fontTmp.Add($"font/ARIAL.TTF");
//var install_Family = fontTmp.Add($"ARIAL.TTF");
var install_Family = fontTmp.Add($"./wwwroot/font/Arial.ttf");
//var install_Family = fontTmp.Add($"C:/Windows/Fonts/ARIAL.TTF");
//var install_Family = fontTmp.Add($"C:/Windows/Fonts/Arial/ARIAL.TTF");
var font = new SixLabors.Fonts.Font(install_Family, fontSize);
image.Mutate(x => x
.DrawText(
chkCode[i].ToString(), //文字内容
font,
color[rnd.Next(color.Length)],
new Vector2((float)i * 20, (float)0))
);
//将文字写到画布上
//Font ft = new Font(fnt, fontSize);
// Color clr = color[rnd.Next(color.Length)];
// g.DrawString(chkCode[i].ToString(), ft, new SolidBrush(clr), (float)i * 18, (float)0);
}
//画图片的前景噪音点
for (int i = 0; i < 15; i++)
{
int x1 = rnd.Next(codeW);
int y1 = rnd.Next(codeH);
int x2 = x1 + 2;
int y2 = y1 + 2;
image.Mutate(x => x
//画实线
.DrawLines(
color[rnd.Next(color.Length)], //字体颜色
2, //字体大小
new SixLabors.ImageSharp.PointF[]{
new Vector2(x1, y1),
new Vector2(x2, y2)
} //两点一线坐标
));
}
//SixLabors.ImageSharp.Formats.Png.PngTextData
//IImageFormat bFormat = new Formats;
//ImgStr = image.ToBase64String(SixLabors.ImageSharp.Formats.Png.PngFormat.Instance);
//保存成文件
//image.SaveAsJpeg($"./wwwroot/img/test.jpg");
//保存成base64字符串
using var memoryStream = new MemoryStream();
image.Save(memoryStream, SixLabors.ImageSharp.Formats.Png.PngFormat.Instance);
var base64String = Convert.ToBase64String(memoryStream.ToArray());
ImgStr = $"data:image/jpeg;base64,{base64String}";
Yzm = chkCode;
}
catch (Exception ex)
{
string aMsg = ex.Message;
}
}
}