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));
/// <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;
//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;
}
}
/// <summary>
/// 绘制每个字符
/// </summary>
/// <param name="g"></param>
/// <param name="_text"></param>
/// <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);
g.FillPath(new SolidBrush(Color.Red), gp);
}
public enum Char_Direction
{
Center = 0,
OutSide = 1,
ClockWise = 2,
AntiClockWise = 3,
}
}
}