自定义签名章代码,CSharp代码库,德仔网

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【CSharp】自定义签名章
作者:kunkun0921 / 发布于2015/1/26/ 1006

	using System;
	using System.Collections.Generic;
	using System.Linq;
	using System.Text;
	using System.Drawing;
	using System.Drawing.Imaging;
	using System.Drawing.Drawing2D;

	namespace WfpApp
	{
	 public class DrawCachet
	 {
	 /// <summary>
	 /// 自定义椭圆形签名章
	 /// </summary>
	 /// <param name="Width">宽度，画出的签名章只有这宽度的一半</param>
	 /// <param name="Height">高度，画出的签名章只有这高度的一半</param>
	 /// <param name="test">签名章上名字</param>
	 /// <param name="IsRotate">签名章是否旋转角度</param>
	 /// <param name="angle">旋转角度的大小</param>
	 /// <returns></returns>
	 public static Bitmap GetDrawCircleCachet(int Width, int Height, string test, bool IsRotate, int angle)
	 {
	 //记录圆画笔的粗细
	 int Circle_Brush = 2;
	 //画布
	 Bitmap bitmap = new Bitmap(Width, Height);
	 //定义字符串的样式
	 Font var_Font = new Font("Arial", 13, FontStyle.Bold);
	 //定义一个矩形 ,设置圆的绘制区
	 Rectangle rect = new Rectangle(10, 10, Width / 2, Height / 2);
	 //实例化Graphic类
	 Graphics g = System.Drawing.Graphics.FromImage(bitmap);

	 //消除绘制图形的锯齿，平滑
	 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
	 //以白色清空panelCachet画布背景
	 g.Clear(Color.White);
	 //设置画笔的颜色
	 Pen mypen = new Pen(Color.Red, Circle_Brush);
	 //绘制圆
	 g.DrawEllipse(mypen, rect);

	 //设置文字的字体样式
	 Font star_Font = new Font("Arial", 12, FontStyle.Regular);
	 //对字符串进行宽度和长度测量
	 SizeF var_Size = g.MeasureString(test, star_Font);

	 float CircleZjW = rect.Width + 2 * Circle_Brush;
	 float CircleZJH = rect.Height + 2 * Circle_Brush;

	 float x = (CircleZjW - var_Size.Width) / 2F + rect.X;
	 float y = (CircleZJH - var_Size.Height) / 2F + rect.Y;

	 //在指定的位置绘制文字
	 g.DrawString(test, star_Font, mypen.Brush, new PointF(x, y));

	 if (IsRotate)
	 bitmap = Rotate(bitmap, angle);
	 return bitmap;
	 }

	 /// <summary>
	 /// 自定义矩形签名章
	 /// </summary>
	 /// <param name="width">宽度，画出的签名章只有这宽度的一半</param>
	 /// <param name="height">高度，画出的签名章只有这高度的一半</param>
	 /// <param name="name">签名章上名字</param>
	 /// <param name="IsRotate">签名章是否旋转角度</param>
	 /// <param name="angle">旋转角度的大小</param>
	 /// <returns></returns>
	 public static Bitmap GetDrawRectangle(int width, int height, string name, bool IsRotate, int angle)
	 {
	 //记录圆画笔的粗细
	 int Circle_Brush = 2;
	 //画布
	 Bitmap bitmap = new Bitmap(width, height);
	 //定义字符串的样式
	 Font var_Font = new Font("Arial", 13, FontStyle.Bold);
	 //定义一个矩形 ,设置圆的绘制区
	 Rectangle rect = new Rectangle(10, 10, width / 2, height / 2);
	 //实例化Graphic类
	 Graphics g = System.Drawing.Graphics.FromImage(bitmap);
	 //消除绘制图形的锯齿，平滑
	 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
	 //以白色清空panelCachet画布背景
	 g.Clear(Color.White);
	 //设置画笔的颜色
	 Pen mypen = new Pen(Color.Red, Circle_Brush);
	 //绘制圆
	 g.DrawRectangle(mypen, rect);

	 //设置文字的字体样式
	 Font star_Font = new Font("Arial", 12, FontStyle.Regular);
	 //对字符串进行宽度和长度测量
	 SizeF var_Size = g.MeasureString(name, star_Font);

	 float CircleZjW = rect.Width + 2 * Circle_Brush;
	 float CircleZJH = rect.Height + 2 * Circle_Brush;

	 float x = (CircleZjW - var_Size.Width) / 2F + rect.X;
	 float y = (CircleZJH - var_Size.Height) / 2F + rect.Y;

	 //在指定的位置绘制文字
	 g.DrawString(name, star_Font, mypen.Brush, new PointF(x, y));

	 if (IsRotate)
	 bitmap = Rotate(bitmap, angle);

	 return bitmap;
	 }

	
	 /// <summary>
	 /// 签名章旋转
	 /// </summary>
	 /// <param name="b">Bitmap图章</param>
	 /// <param name="angle">旋转度</param>
	 /// <returns></returns>
	 static Bitmap Rotate(Bitmap b, int angle)
	 {
	 angle = angle % 360;
	 //弧度转换
	 double radian = angle * Math.PI / 180.0;
	 double cos = Math.Cos(radian);
	 double sin = Math.Sin(radian);
	 //原图的宽和高
	 int w = b.Width;
	 int h = b.Height;
	 int W = (int)(Math.Max(Math.Abs(w * cos - h * sin), Math.Abs(w * cos + h * sin)));
	 int H = (int)(Math.Max(Math.Abs(w * sin - h * cos), Math.Abs(w * sin + h * cos)));
	 //目标位图
	 Bitmap dsImage = new Bitmap(W, H);
	 System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(dsImage);
	 g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Bilinear;
	 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
	 //计算偏移量
	 Point Offset = new Point((W - w) / 2, (H - h) / 2);
	 //构造图像显示区域：让图像的中心与窗口的中心点一致
	 Rectangle rect = new Rectangle(Offset.X, Offset.Y, w, h);
	 Point center = new Point(rect.X + rect.Width / 2, rect.Y + rect.Height / 2);
	 g.TranslateTransform(center.X, center.Y);
	 g.RotateTransform(360 - angle);
	 //恢复图像在水平和垂直方向的平移
	 g.TranslateTransform(-center.X, -center.Y);
	 g.DrawImage(b, rect);
	 //重至绘图的所有变换
	 g.ResetTransform();
	 g.Save();
	 g.Dispose();
	 //dsImage.Save("yuancd.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
	 return dsImage;
	 }
	 }
	}
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