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C#生成电子印章源码

C#⽣成电⼦印章源码

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Drawing.Drawing2D;

namespace Cachet

{

public class CreatPublicSeal

{

Font Var_Font = new Font("Arial", 12, FontStyle.Bold);//定义字符串的字体样式

//Rectangle rect = new Rectangle(10, 10, 160, 160);//实例化Rectangle类

private static int tem_Line = 160;//记录圆的直径

private static int circularity_W = 4;//设置圆画笔的粗细

//圆线条

private static Rectangle rect = new Rectangle(circularity_W, circularity_W, tem_Line - circularity_W * 2, tem_Line - circularity_W * 2);//设置圆的绘制区域

private static int _letterspace = 4;//字体间距

private static Char_Direction _chardirect = Char_Direction.Center;

private static int _degree = 90;

//字体圆弧所在圆

private static int space = 16;//⽐外⾯圆圈⼩

private static Rectangle NewRect = new Rectangle(new Point(rect.X + space, rect.Y + space), new Size(rect.Width - 2 * space, rect.Height - 2 * space));

led天花灯电源/// <summary>

/// 创建公司公共印章得到gif图⽚存储地址

/// </summary>

/// <param name="company">公司名字</param>

/// <param name="department">部门名字</param>

/// <param name="Url">图⽚保存路径</param>

/// <returns></returns>

public static string CreatSeal(string company, string department, string Url)

{

string star_Str = "★";

Bitmap bMap = new Bitmap(160, 160);//画图初始化

Graphics g= Graphics.FromImage(bMap);

//Graphics g = this.panel1.CreateGraphics();//实例化Graphics类

g.SmoothingMode = SmoothingMode.AntiAlias;//消除绘制图形的锯齿

g.Clear(Color.White);//以⽩⾊清空panel1控件的背景

Pen myPen = new Pen(Color.Red, circularity_W);//设置画笔的颜⾊

g.DrawEllipse(myPen, rect); //绘制圆

Font star_Font = new Font("Arial", 30, FontStyle.Regular);//设置星号的字体样式

SizeF star_Size = g.MeasureString(star_Str, star_Font);//对指定字符串进⾏测量

/要指定的位置绘制星号

PointF star_xy = new PointF(tem_Line / 2 - star_Size.Width / 2, tem_Line / 2 - star_Size.Height / 2);

g.DrawString(star_Str, star_Font, myPen.Brush, star_xy);

//绘制中间⽂字

string var_txt = department;

//string var_txt = "财务部";

int var_len = var_txt.Length;

Font Var_Font = new Font("Arial", 22 - var_len*2, FontStyle.Bold);//定义部门字体的字体样式

SizeF Var_Size = g.MeasureString(var_txt, Var_Font);//对指定字符串进⾏测量

//要指定的位置绘制中间⽂字

PointF Var_xy = new PointF(tem_Line / 2 - Var_Size.Width / 2, tem_Line / 2 + star_Size.Height / 2 - Var_Size.Height/2+5);

g.DrawString(var_txt, Var_Font, myPen.Brush, Var_xy);

//string text_txt = "吉林省明⽇科技有限公司";

string text_txt = company + "专⽤";

int text_len = text_txt.Length;//获取字符串的长度

Font text_Font = new Font("Arial", 25 - text_len, FontStyle.Bold);//定义公司名字的字体的样式

Pen myPenbush = new Pen(Color.White, circularity_W);

float[] fCharWidth = new float[text_len];

float fTotalWidth = ComputeStringLength(text_txt, g, fCharWidth, _letterspace, _chardirect, text_Font);

// Compute arc's start-angle and end-angle

double fStartAngle, fSweepAngle;

fSweepAngle = fTotalWidth * 360 / (NewRect.Width * Math.PI);

fStartAngle = 270 - fSweepAngle / 2;

// Compute every character's position and angle

//PointF[] pntChars = new PointF[text_len];

PointF[] pntChars = new PointF[text_len];

double[] fCharAngle = new double[text_len];

ComputeCharPos(fCharWidth, pntChars, fCharAngle, fStartAngle);

for (int i = 0; i < text_len; i++)

{

DrawRotatedText(g, text_txt[i].ToString(), (float)(fCharAngle[i] + _degree), pntChars[i], text_Font, myPenbush);

}

string imageName = DateTime.Now.ToString("yyyyMMddHHmmss") + ".gif";

bMap.Save(Url + imageName);

return Url + imageName;

}

/// <summary>

/// 计算字符串总长度和每个字符长度

/// </summary>

/// <param name="sText"></param>

/// <param name="g"></param>

/// <param name="fCharWidth"></param>

// <param name="fIntervalWidth"></param>

/// <returns></returns>

private static float ComputeStringLength(string sText, Graphics g, float[] fCharWidth, float fIntervalWidth, Char_Direction Direction, Font text_Font)

{

// Init字符串格式

StringFormat sf = new StringFormat();

sf.Trimming = StringTrimming.None;

sf.FormatFlags = StringFormatFlags.NoClip | StringFormatFlags.NoWrap

| StringFormatFlags.LineLimit;

// 衡量整个字符串长度

SizeF size = g.MeasureString(sText, text_Font, (int)text_Font.Style);

RectangleF rect = new RectangleF(0f, 0f, size.Width, size.Height);

// 测量每个字符⼤⼩

CharacterRange[] crs = new CharacterRange[sText.Length];

for (int i = 0; i < sText.Length; i++)

crs[i] = new CharacterRange(i, 1);

// 复位字符串格式

sf.FormatFlags = StringFormatFlags.NoClip;

sf.SetMeasurableCharacterRanges(crs);

sf.Alignment = StringAlignment.Near;

// 得到每⼀个字符⼤⼩

Region[] regs = g.MeasureCharacterRanges(sText, text_Font, rect, sf);

// Re-compute whole string length with space interval width

float fTotalWidth = 0f;

for (int i = 0; i < regs.Length; i++)

{

if (Direction == Char_Direction.Center || Direction == Char_Direction.OutSide)

fCharWidth[i] = regs[i].GetBounds(g).Width;

else

fCharWidth[i] = regs[i].GetBounds(g).Height;

fTotalWidth += fCharWidth[i] + fIntervalWidth;

}

fTotalWidth -= fIntervalWidth;//Remove the last interval width

return fTotalWidth;

}

/// <summary>

/// 求出每个字符的所在的点，以及相对于中⼼的⾓度

///1．通过字符长度，求出字符所跨的弧度；

///2．根据字符所跨的弧度，以及字符起始位置，算出字符的中⼼位置所对应的⾓度；

///3．由于相对中⼼的⾓度已知，根据三⾓公式很容易算出字符所在弧上的点，如下图所⽰；

///4．根据字符长度以及间隔距离，算出下⼀个字符的起始⾓度；

///5．重复1直⾄整个字符串结束。

/// </summary>

// <param name="CharWidth"></param>

/// <param name="recChars"></param>

/// <param name="CharAngle"></param>

/// <param name="StartAngle"></param>

private static void ComputeCharPos(float[] CharWidth, PointF[] recChars, double[] CharAngle, double StartAngle) {

double fSweepAngle, fCircleLength;

//Compute the circumference

fCircleLength = NewRect.Width * Math.PI;

for (int i = 0; i < CharWidth.Length; i++)

{

//Get char sweep angle

fSweepAngle = CharWidth[i] * 360 / fCircleLength;

//Set point angle

CharAngle[i] = StartAngle + fSweepAngle / 2;

哑光玻璃

//Get char position

if (CharAngle[i] < 270f)

recChars[i] = new PointF(

NewRect.X + NewRect.Width / 2

- (float)(NewRect.Width / 2 *

Math.Sin(Math.Abs(CharAngle[i] - 270) * Math.PI / 180)),

NewRect.Y + NewRect.Width / 2

(float)(NewRect.Width / 2 * Math.Cos(

手机充电站

Math.Abs(CharAngle[i] - 270) * Math.PI / 180)));

else

recChars[i] = new PointF(

NewRect.X + NewRect.Width / 2

+ (float)(NewRect.Width / 2 *

Math.Sin(Math.Abs(CharAngle[i] - 270) * Math.PI / 180)),

NewRect.Y + NewRect.Width / 2

- (float)(NewRect.Width / 2 * Math.Cos(

电子签章生成Math.Abs(CharAngle[i] - 270) * Math.PI / 180)));

//Get total sweep angle with interval space

fSweepAngle = (CharWidth[i] + _letterspace) * 360 / fCircleLength;

StartAngle += fSweepAngle;

}

/// <summary>

/// 绘制每个字符

/// </summary>

/// <param name="g"></param>

/// <param name="_text"></param>

文具盒生产过程

/// <param name="_angle"></param>

/// <param name="text_Point"></param>

// <param name="text_Font"></param>

/// <param name="myPen"></param>

private static void DrawRotatedText(Graphics g, string _text, float _angle, PointF text_Point, Font text_Font, Pen myPen) {

// Init format

StringFormat sf = new StringFormat();

sf.Alignment = StringAlignment.Center;

sf.LineAlignment = StringAlignment.Center;

// Create graphics path

GraphicsPath gp = new GraphicsPath(System.Drawing.Drawing2D.FillMode.Winding);

int x = (int)text_Point.X;

int y = (int)text_Point.Y;

// Add string

gp.AddString(_text, text_Font.FontFamily, (int)text_Font.Style, text_Font.Size, new Point(x, y), sf);

// Rotate string and draw it

Matrix m = new Matrix();

m.RotateAt(_angle, new PointF(x, y));

g.Transform = m;

g.DrawPath(myPen, gp);so.csdn/api/v3/search?p=1&t=all&q=

g.FillPath(new SolidBrush(Color.Red), gp);

}

public enum Char_Direction

{

Center = 0,

OutSide = 1,

ClockWise = 2,

AntiClockWise = 3, }

}

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