C# 绘制印章
最近有个.net core的项目要绘制印章功能，一个公司印章，一个个人印章，于是抽了点时间自己写了一个，现在分享出来
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Text;
namespace DemoConsole
{
public class SealHelper
{
public static MechanismSealHelper Mechanism()
{
return new MechanismSealHelper();
}
public static PersonalSealHelper Personal()
{
return new PersonalSealHelper();
}
public class MechanismSealHelper : IDisposable
{
string star = "★";
int size = 160;
Image map;
Graphics g;
int defaultWidth;
float defaultStarSize;
float defaultTitleSize;
float defaultHorizontalSize;
float defaultChordSize;
public Color Color { get; set; } = Color.Red;
public string DefaultFontName { get; set; } = "SimSun";
public MechanismSealHelper()
{
map = new Bitmap(size, size);
g = Graphics.FromImage(map);//实例化Graphics类
g.SmoothingMode = SmoothingMode.AntiAlias; //System.Drawing.Drawing2D;
g.Clear(Color.Transparent);
defaultWidth = size / 40;
defaultStarSize = size / 5;
defaultTitleSize = (float)Math.Sqrt(size);
defaultHorizontalSize = (float)Math.Sqrt(size);
defaultChordSize = size / 20;
}
/// <summary>
/// 绘制圆
/// </summary>
public void DrawCircle()
{
DrawCircle(defaultWidth);
}
/// <summary>
/// 绘制圆
/// </summary>
/// <param name="width">画笔粗细</param>
public void DrawCircle(int width)
{
Rectangle rect = new Rectangle(width, width, size - width \* 2, size - width \* 2);//设置圆的绘制区域
Pen pen = new Pen(Color, width); //设置画笔（颜色和粗细）
g.DrawEllipse(pen, rect); //绘制圆
}
/// <summary>
/// 绘制星星
/// </summary>
public void DrawStar()
{
DrawStar(defaultStarSize, defaultWidth);
}
/// <summary>
/// 绘制星星
/// </summary>
/// <param name="emSize"></param>
public void DrawStar(float emSize)
{
DrawStar(emSize, defaultWidth);
}
/// <summary>
/// 绘制星星
/// </summary>
/// <param name="emSize">字体大小</param>
/// <param name="width">画笔粗细</param>
public void DrawStar(float emSize, int width)
{
Font starFont = new Font(DefaultFontName, emSize, FontStyle.Bold);//设置星号的字体样式
var starSize = g.MeasureString(star, starFont);//对指定字符串进行测量
//要指定的位置绘制星号
PointF starXy = new PointF(size / 2 - starSize.Width / 2, size / 2 - starSize.Height / 2);
g.DrawString(star, starFont, new SolidBrush(Color), starXy);
}
/// <summary>
/// 绘制主题
/// </summary>
/// <param name="title">主题（公司名称）</param>
/// <param name="startAngle">开始角度</param>
public void DrawTitle(string title, float startAngle = 160)
{
DrawTitle(title, startAngle, defaultTitleSize);
}
/// <summary>
/// 绘制主题
/// </summary>
/// <param name="title">主题（公司名称）</param>
/// <param name="startAngle">开始角度,必须是左半边，推荐（135-270）</param>
/// <param name="emSize">字体大小</param>
public void DrawTitle(string title, float startAngle, float emSize)
{
DrawTitle(title, startAngle, emSize, defaultWidth);
}
/// <summary>
/// 绘制主题
/// </summary>
/// <param name="title">主题（公司名称）</param>
/// <param name="startAngle">开始角度,必须是左半边，推荐（135-270）</param>
/// <param name="emSize">字体大小</param>
/// <param name="width">画笔粗细</param>
public void DrawTitle(string title, float startAngle, float emSize, int width)
{
Font font = new Font(DefaultFontName, emSize, FontStyle.Bold);
DrawTitle(title, startAngle, font, width);
}
/// <summary>
/// 绘制主题
/// </summary>
/// <param name="title">主题（公司名称）</param>
/// <param name="startAngle">开始角度,必须是左半边，推荐（135-270）</param>
/// <param name="font">字体</param>
/// <param name="width">画笔粗细</param>
public void DrawTitle(string title, float startAngle, Font font, int width)
{
if (string.IsNullOrEmpty(title))
{
return;
}
if (Math.Cos(startAngle / 180 \* Math.PI) > 0)
{
throw new ArgumentException($"初始角度错误：{startAngle}(建议135-270)", nameof(startAngle));
}
startAngle = startAngle % 360;//起始角度
var length = title.Length;
float changeAngle = (270 - startAngle) \* 2 / length;//每个字所占的角度，也就是旋转角度
var circleWidth = size / 2 - width \* 3;//字体圆形的长度
var fontSize = g.MeasureString(title, font);//测量一下字体
var per = fontSize.Width / length;//每个字体的长度
//在指定的角度绘制字符
void action(string t, float a)
{
var angleXy = a / 180 \* Math.PI;
var x = size / 2 + Math.Cos(angleXy) \* circleWidth;
var y = size / 2 + Math.Sin(angleXy) \* circleWidth;
DrawChar(t, (float)x, (float)y, a + 90, font, width);
}
//起始绘制角度=起始角度+旋转角度/2-字体所占角度的一半
var angle = startAngle + changeAngle / 2 - (float)(Math.Asin(per / 2 / circleWidth) / Math.PI \* 180);//起始绘制角度
for (var i = 0; i < length; i++)
{
action(title\[i\].ToString(), angle);
angle += changeAngle;
}
}
/// <summary>
/// 绘制横向文
/// </summary>
/// <param name="text">横向文</param>
public void DrawHorizontal(string text)
{
DrawHorizontal(text, defaultHorizontalSize);
}
/// <summary>
/// 绘制横向文
/// </summary>
/// <param name="text">横向文</param>
/// <param name="emSize">字体大小</param>
public void DrawHorizontal(string text, float emSize)
{
Font font = new Font(DefaultFontName, emSize, FontStyle.Bold);//定义字体的字体样式
DrawHorizontal(text, font);
}
/// <summary>
/// 绘制横向文
/// </summary>
/// <param name="text">横向文</param>
/// <param name="font">字体</param>
public void DrawHorizontal(string text, Font font)
{
int length = text.Length;
SizeF textSize = g.MeasureString(text, font);//对指定字符串进行测量
while (textSize.Width > size \* 2 / 3)
{
DrawHorizontal(text, new Font(font.Name, font.Size - 1, font.Style));
return;
}
//要指定的位置绘制中间文字
PointF point = new PointF(size / 2 - textSize.Width / 2, size \* 2 / 3);
g.ResetTransform();
g.DrawString(text, font, new SolidBrush(Color), point);
}
/// <summary>
/// 绘制下弦文
/// </summary>
/// <param name="text">下弦文</param>
/// <param name="startAngle">开始角度,必须是左下半边，推荐（90-180）</param>
public void DrawChord(string text, float startAngle = 135)
{
DrawChord(text, startAngle, defaultChordSize);
}
/// <summary>
/// 绘制下弦文
/// </summary>
/// <param name="text">下弦文</param>
/// <param name="startAngle">开始角度,必须是左下半边，推荐（90-180）</param>
/// <param name="emSize">字体大小</param>
public void DrawChord(string text, float startAngle, float emSize)
{
DrawChord(text, startAngle, emSize, defaultWidth);
}
/// <summary>
/// 绘制下弦文
/// </summary>
/// <param name="text">下弦文</param>
/// <param name="startAngle">开始角度,必须是左下半边，推荐（90-180）</param>
/// <param name="emSize">字体大小</param>
/// <param name="width">画笔粗细</param>
public void DrawChord(string text, float startAngle, float emSize, int width)
{
Font font = new Font(DefaultFontName, emSize, FontStyle.Bold);//定义字体的字体样式
DrawChord(text, startAngle, font, width);
}
/// <summary>
/// 绘制下弦文
/// </summary>
/// <param name="text">下弦文</param>
/// <param name="startAngle">开始角度,必须是左下半边，推荐（90-180）</param>
/// <param name="font">字体</param>
/// <param name="width">画笔粗细</param>
public void DrawChord(string text, float startAngle, Font font, int width)
{
if (string.IsNullOrEmpty(text))
{
return;
}
if (Math.Cos(startAngle / 180 \* Math.PI) > 0)
{
throw new ArgumentException($"初始角度错误：{startAngle}(建议90-135)", nameof(startAngle));
}
startAngle = startAngle % 360;//起始角度
var length = text.Length;
float changeAngle = (startAngle - 90) \* 2 / length;//每个字所占的角度，也就是旋转角度
var fontSize = g.MeasureString(text, font);//测量一下字体
var per = fontSize.Width / length;//每个字体的长度
var circleWidth = size / 2 - width \* 2 - fontSize.Height;//字体圆形的长度
//在指定的角度绘制字符
void action(string t, float a)
{
var angleXy = a / 180 \* Math.PI;
var x = size / 2 + Math.Cos(angleXy) \* circleWidth;
var y = size / 2 + Math.Sin(angleXy) \* circleWidth;
DrawChar(t, (float)x, (float)y, a - 90, font, width);
}
//起始绘制角度=起始角度-旋转角度/2+字体所占角度的一半
var angle = startAngle - changeAngle / 2 + (float)(Math.Asin(per / 2 / circleWidth) / Math.PI \* 180);//起始绘制角度
for (var i = 0; i < length; i++)
{
action(text\[i\].ToString(), angle);
angle -= changeAngle;
}
}
/// <summary>
/// 绘制单个字符
/// </summary>
/// <param name="char">字符</param>
/// <param name="x">距离画布左边的距离</param>
/// <param name="y">距离画布上边的距离</param>
/// <param name="emSize">字体大小</param>
/// <param name="width">画笔粗细</param>
public void DrawChar(string @char, float x, float y, float emSize)
{
DrawChar(@char, x, y, 0, emSize);
}
/// <summary>
/// 绘制单个字符
/// </summary>
/// <param name="char">字符</param>
/// <param name="x">距离画布左边的距离</param>
/// <param name="y">距离画布上边的距离</param>
/// <param name="angle">选中角度，0度为右方，顺时针增加</param>
/// <param name="emSize">字体大小</param>
/// <param name="width">画笔粗细</param>
public void DrawChar(string @char, float x, float y, float angle, float emSize)
{
DrawChar(@char, x, y, angle, emSize, defaultWidth);
}
/// <summary>
/// 绘制单个字符
/// </summary>
/// <param name="char">字符</param>
/// <param name="x">距离画布左边的距离</param>
/// <param name="y">距离画布上边的距离</param>
/// <param name="angle">选中角度，0度为右方，顺时针增加</param>
/// <param name="emSize">字体大小</param>
/// <param name="width">画笔粗细</param>
public void DrawChar(string @char, float x, float y, float angle, float emSize, int width)
{
Font font = new Font(DefaultFontName, emSize, FontStyle.Bold);
DrawChar(@char, x, y, angle, font, width);
}
/// <summary>
/// 绘制单个字符
/// </summary>
/// <param name="char">字符</param>
/// <param name="x">距离画布左边的距离</param>
/// <param name="y">距离画布上边的距离</param>
/// <param name="angle">选中角度，0度为右方，顺时针增加</param>
/// <param name="fontName">字体</param>
/// <param name="width">画笔粗细</param>
public void DrawChar(string @char, float x, float y, float angle, Font font, int width)
{
if (string.IsNullOrEmpty(@char) || @char.Length != 1)
{
throw new ArgumentException("only one char is supported", nameof(@char));
}
g.ResetTransform();//重置
g.TranslateTransform(x, y);//调整偏移
g.RotateTransform(angle);//旋转角度
g.DrawString(@char, font, new SolidBrush(Color), 0, 0);//绘制，因为使用了偏移，所以这里的坐标是相对偏移的，所以是0
}
/// <summary>
/// 保存图片
/// </summary>
/// <param name="fileName"></param>
public void Save(string fileName)
{
map.Save(fileName);
}
/// <summary>
/// 保存图片
/// </summary>
/// <param name="stream"></param>
/// <param name="format"></param>
public void Save(Stream stream, ImageFormat format)
{
map.Save(stream, format);
}
public void Dispose()
{
try
{
if (map != null)
{
map.Dispose();
}
if (g != null)
{
g.Dispose();
}
}
catch { }
}
}
public class PersonalSealHelper : IDisposable
{
int size = 160;
Image map;
Graphics g;
int defaultWidth;
float defaultSquareSize;
float defaultNameSize;
bool isSquare = false;
public Color Color { get; set; } = Color.Red;
public string DefaultFontName { get; set; } = "SimSun";
public PersonalSealHelper()
{
map = new Bitmap(size, size);
g = Graphics.FromImage(map);//实例化Graphics类
g.SmoothingMode = SmoothingMode.AntiAlias; //System.Drawing.Drawing2D;
g.Clear(Color.Transparent);
defaultWidth = size / 40;
defaultSquareSize = size / 4;
defaultNameSize = size / 4;
}
/// <summary>
/// 绘制方形之印
/// </summary>
public void DrawSquare()
{
DrawSquare(defaultSquareSize);
}
/// <summary>
/// 绘制方形之印
/// </summary>
/// <param name="emSize">字体大小</param>
public void DrawSquare(float emSize)
{
DrawSquare(emSize, defaultWidth);
}
/// <summary>
/// 绘制方形之印
/// </summary>
/// <param name="font">字体</param>
public void DrawSquare(Font font)
{
DrawSquare(font, defaultWidth);
}
/// <summary>
/// 绘制方形之印
/// </summary>
/// <param name="emSize">字体大小</param>
/// <param name="width">画笔粗细</param>
public void DrawSquare(float emSize, int width)
{
Font font = new Font(DefaultFontName, emSize, FontStyle.Bold);//设置之印的字体样式
DrawSquare(font, width);
}
/// <summary>
/// 绘制方形之印
/// </summary>
/// <param name="font">字体</param>
/// <param name="width">画笔粗细</param>
public void DrawSquare(Font font, int width)
{
isSquare = true;
var pen = new Pen(Color, width);//设置画笔的颜色
Rectangle rect = new Rectangle(width, width, size - width \* 2, size - width \* 2);//设置绘制区域
g.DrawRectangle(pen, rect);
var textSize = g.MeasureString("之印", font);//对指定字符串进行测量
var left = (size / 2 - width \* 2 - textSize.Width / 2) / 2;
var perHeght = (size - width \* 4 - textSize.Height \* 2) / 3;
PointF point1 = new PointF(left + width \* 2, perHeght + width \* 2);
g.DrawString("之", font, pen.Brush, point1);
PointF point2 = new PointF(left + width \* 2, perHeght \* 2 + width \* 2 + textSize.Height);
g.DrawString("印", font, pen.Brush, point2);
}
/// <summary>
/// 绘制带边框的姓名
/// </summary>
/// <param name="name">姓名</param>
public void DrawNameWithBorder(string name)
{
DrawNameWithBorder(name, defaultNameSize, defaultWidth);
}
/// <summary>
/// 绘制带边框的姓名
/// </summary>
/// <param name="name">姓名</param>
/// <param name="font">字体</param>
public void DrawNameWithBorder(string name, Font font)
{
DrawNameWithBorder(name, font, defaultWidth);
}
/// <summary>
/// 绘制带边框的姓名
/// </summary>
/// <param name="name">姓名</param>
/// <param name="emSize">字体大小</param>
public void DrawNameWithBorder(string name, float emSize)
{
DrawNameWithBorder(name, emSize, defaultWidth);
}
/// <summary>
/// 绘制带边框的姓名
/// </summary>
/// <param name="name">姓名</param>
/// <param name="emSize">字体大小</param>
/// <param name="width">画笔粗细</param>
public void DrawNameWithBorder(string name, float emSize, int width)
{
Font font = new Font(DefaultFontName, emSize, FontStyle.Bold);//设置字体样式
DrawNameWithBorder(name, font, width);
}
/// <summary>
/// 绘制带边框的姓名
/// </summary>
/// <param name="name">姓名</param>
/// <param name="font">字体</param>
/// <param name="width">画笔粗细</param>
public void DrawNameWithBorder(string name, Font font, int width)
{
var nameSize = g.MeasureString(name, font);//对指定字符串进行测量
while (nameSize.Width > size - width \* 6)
{
DrawNameWithBorder(name, new Font(font.Name, font.Size - 1, font.Style), width);
return;
}
var left = (int)(size - nameSize.Width - width \* 4) / 2;
var height = (int)(size - nameSize.Height - width \* 4) / 2;
var pen = new Pen(Color, width);//设置画笔的颜色
Rectangle rect = new Rectangle(width, height, size - width \* 2, size - height \* 2);//设置绘制区域
g.DrawRectangle(pen, rect);
PointF point = new PointF(width + width \* 2, height + width \* 2);
g.DrawString(name, font, pen.Brush, point);
}
/// <summary>
/// 绘制带边框的姓名
/// </summary>
/// <param name="name">姓名</param>
public void DrawName(string name)
{
DrawName(name, defaultNameSize, defaultWidth);
}
/// <summary>
/// 绘制带边框的姓名
/// </summary>
/// <param name="name">姓名</param>
/// <param name="font">字体</param>
public void DrawName(string name, Font font)
{
DrawName(name, font, defaultWidth);
}
/// <summary>
/// 绘制带边框的姓名
/// </summary>
/// <param name="name">姓名</param>
/// <param name="emSize">字体大小</param>
public void DrawName(string name, float emSize)
{
DrawName(name, emSize, defaultWidth);
}
/// <summary>
/// 绘制带边框的姓名
/// </summary>
/// <param name="name">姓名</param>
/// <param name="emSize">字体大小</param>
/// <param name="width">画笔粗细</param>
public void DrawName(string name, float emSize, int width)
{
Font font = new Font(DefaultFontName, emSize, FontStyle.Bold);//设置字体样式
DrawName(name, font, width);
}
/// <summary>
/// 绘制姓名
/// </summary>
/// <param name="name">姓名</param>
/// <param name="font">字体</param>
/// <param name="width">画笔粗细</param>
public void DrawName(string name, Font font, int width)
{
var nameSize = g.MeasureString(name, font);//对指定字符串进行测量
while (nameSize.Width > size - width \* 6)
{
DrawName(name, new Font(font.Name, font.Size - 1, font.Style), width);
return;
}
if (isSquare)
{
int length = name.Length;//获取字符串的长度
var left = (size / 2 - width - nameSize.Width / length) / 2;
var height = (size - width \* 4 - nameSize.Height \* length) / (length + 1);
if (left <= 0 || height <= 0)
{
return;
}
for (var i = 0; i < length; i++)
{
PointF point = new PointF(width + size / 2, height \* (i + 1) + width \* 2 + nameSize.Height \* i);
g.DrawString(name\[i\].ToString(), font, new SolidBrush(Color), point);
}
}
else
{
var left = (size - nameSize.Width) / 2;
var height = (size - nameSize.Height) / 2;
PointF point = new PointF(width, height);
g.DrawString(name, font, new SolidBrush(Color), point);
}
}
/// <summary>
/// 保存图片
/// </summary>
/// <param name="fileName"></param>
public void Save(string fileName)
{
map.Save(fileName);
}
/// <summary>
/// 保存图片
/// </summary>
/// <param name="stream"></param>
/// <param name="format"></param>
public void Save(Stream stream, ImageFormat format)
{
map.Save(stream, format);
}
public void Dispose()
{
try
{
if (map != null)
{
map.Dispose();
}
if (g != null)
{
g.Dispose();
}
}
catch { }
}
}
} }
注意了，.net core没有System.Drawing，替代方案是使用第三方的依赖，这里推荐使用Nuget的System.Drawing.Common。
另外，代码使用的是最新版本的C#，如果使用旧版本的可能会报错，相对于的调整一下就好了
这个辅助类还能生成不同颜色和字体的印章，可随需求而变
如果在Linux下发现中文乱码，那应该是没有安装相应的字体，可以将windows下的C:\Windows\Fonts的字体拷贝到linux对应目录下（Ubuntu是/usr/share/fonts），在安装，清空缓存，重启后就可以了
生成公司印章：
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
namespace DemoConsole
{
class Program
{
static void Main(string[] args)
{
using (var helper = SealHelper.Mechanism())
{
helper.DrawCircle();//绘制圆
helper.DrawStar();//绘制星星
helper.DrawTitle("某某科技股份有限公司");//绘制公司名称
helper.DrawHorizontal("练习专用");//绘制横向文
helper.DrawChord("20191016094709");//绘制下弦文
helper.Save(Path.Combine(Directory.GetCurrentDirectory(), "公司印章.png"));
}
}
}
}
生成的印章：
生成个人印章：
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
namespace DemoConsole
{
class Program
{
static void Main(string[] args)
{
//绘制方形印章
using (var helper = SealHelper.Personal())
{
helper.DrawSquare();
helper.DrawName("张三");
helper.Save(Path.Combine(Directory.GetCurrentDirectory(), "张三.png"));
}
//绘制姓名带边框
using (var helper = SealHelper.Personal())
{
helper.DrawNameWithBorder("李四");
helper.Save(Path.Combine(Directory.GetCurrentDirectory(), "李四.png"));
}
//绘制姓名
using (var helper = SealHelper.Personal())
{
helper.DrawName("王五");
helper.Save(Path.Combine(Directory.GetCurrentDirectory(), "王五.png"));
}
}
}
}
生成的印章：
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