C# 生成电子印章
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));
///
/// 创建公司公共印章得到gif图片存储地址
///
/// 公司名字
/// 部门名字
/// 图片保存路径
///
/// 计算字符串总长度和每个字符长度
///
///
///
///
///
///
/// 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。
///
///
///
///
///
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;
//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(
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(
Math.Abs(CharAngle[i] - 270) * Math.PI / 180)));
//Get total sweep angle with interval space
fSweepAngle = (CharWidth[i] + _letterspace) * 360 / fCircleLength;
StartAngle += fSweepAngle;
}
}
///
/// 绘制每个字符
///
///
///
///
///
///
///
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);
g.FillPath(new SolidBrush(Color.Red), gp);
}
public enum Char_Direction
{
Center = 0,
OutSide = 1,
ClockWise = 2,
AntiClockWise = 3,
}
}
}---------------------
作者：kingmax54212008
来源：CSDN
原文：https://blog.csdn.net/kingmax54212008/article/details/53360098