本文實(shí)例講述了C#自定義簽名章實(shí)現(xiàn)方法。分享給大家供大家參考。具體實(shí)現(xiàn)方法如下：
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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> /// 自定義橢圓形簽名章 /// </summary> /// <param name="Width">寬度，畫出的簽名章只有這寬度的一半</param> /// <param name="Height">高度，畫出的簽名章只有這高度的一半</param> /// <param name="test">簽名章上名字</param> /// <param name="IsRotate">簽名章是否旋轉(zhuǎn)角度</param> /// <param name="angle">旋轉(zhuǎn)角度的大小</param> /// <returns></returns> public static Bitmap GetDrawCircleCachet(int Width, int Height, string test, bool IsRotate, int angle) { //記錄圓畫筆的粗細(xì) int Circle_Brush = 2; //畫布 Bitmap bitmap = new Bitmap(Width, Height); //定義字符串的樣式 Font var_Font = new Font("Arial", 13, FontStyle.Bold); //定義一個(gè)矩形 ,設(shè)置圓的繪制區(qū) Rectangle rect = new Rectangle(10, 10, Width / 2, Height / 2); //實(shí)例化Graphic類 Graphics g = System.Drawing.Graphics.FromImage(bitmap); //消除繪制圖形的鋸齒，平滑 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; //以白色清空panelCachet畫布背景 g.Clear(Color.White); //設(shè)置畫筆的顏色 Pen mypen = new Pen(Color.Red, Circle_Brush); //繪制圓 g.DrawEllipse(mypen, rect); //設(shè)置文字的字體樣式 Font star_Font = new Font("Arial", 12, FontStyle.Regular); //對(duì)字符串進(jìn)行寬度和長(zhǎng)度測(cè)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; //在指定的位置繪制文字 g.DrawString(test, star_Font, mypen.Brush, new PointF(x, y)); if (IsRotate) bitmap = Rotate(bitmap, angle); return bitmap; } /// <summary> /// 自定義矩形簽名章 /// </summary> /// <param name="width">寬度，畫出的簽名章只有這寬度的一半</param> /// <param name="height">高度，畫出的簽名章只有這高度的一半</param> /// <param name="name">簽名章上名字</param> /// <param name="IsRotate">簽名章是否旋轉(zhuǎn)角度</param> /// <param name="angle">旋轉(zhuǎn)角度的大小</param> /// <returns></returns> public static Bitmap GetDrawRectangle(int width, int height, string name, bool IsRotate, int angle) { //記錄圓畫筆的粗細(xì) int Circle_Brush = 2; //畫布 Bitmap bitmap = new Bitmap(width, height); //定義字符串的樣式 Font var_Font = new Font("Arial", 13, FontStyle.Bold); //定義一個(gè)矩形 ,設(shè)置圓的繪制區(qū) Rectangle rect = new Rectangle(10, 10, width / 2, height / 2); //實(shí)例化Graphic類 Graphics g = System.Drawing.Graphics.FromImage(bitmap); //消除繪制圖形的鋸齒，平滑 g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; //以白色清空panelCachet畫布背景 g.Clear(Color.White); //設(shè)置畫筆的顏色 Pen mypen = new Pen(Color.Red, Circle_Brush); //繪制圓 g.DrawRectangle(mypen, rect); //設(shè)置文字的字體樣式 Font star_Font = new Font("Arial", 12, FontStyle.Regular); //對(duì)字符串進(jìn)行寬度和長(zhǎng)度測(cè)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; //在指定的位置繪制文字 g.DrawString(name, star_Font, mypen.Brush, new PointF(x, y)); if (IsRotate) bitmap = Rotate(bitmap, angle); return bitmap; } /// <summary> /// 簽名章旋轉(zhuǎn) /// </summary> /// <param name="b">Bitmap圖章</param> /// <param name="angle">旋轉(zhuǎn)度</param> /// <returns></returns> static Bitmap Rotate(Bitmap b, int angle) { angle = angle % 360; //弧度轉(zhuǎn)換 double radian = angle * Math.PI / 180.0; double cos = Math.Cos(radian); double sin = Math.Sin(radian); //原圖的寬和高 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))); //目標(biāo)位圖 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; //計(jì)算偏移量 Point Offset = new Point((W - w) / 2, (H - h) / 2); //構(gòu)造圖像顯示區(qū)域：讓圖像的中心與窗口的中心點(diǎn)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); //恢復(fù)圖像在水平和垂直方向的平移 g.TranslateTransform(-center.X, -center.Y); g.DrawImage(b, rect); //重至繪圖的所有變換 g.ResetTransform(); g.Save(); g.Dispose(); //dsImage.Save("yuancd.jpg", System.Drawing.Imaging.ImageFormat.Jpeg); return dsImage; } }} |
希望本文所述對(duì)大家的C#程序設(shè)計(jì)有所幫助。
