C#自定义签名章实现方法
程序员文章站
2023-01-10 16:31:18
本文实例讲述了c#自定义签名章实现方法。分享给大家供大家参考。具体实现方法如下:
using system;
using system.collections....
本文实例讲述了c#自定义签名章实现方法。分享给大家供大家参考。具体实现方法如下:
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; } } }
希望本文所述对大家的c#程序设计有所帮助。
下一篇: innodb系统表空间维护方法