Day17_C#_GDI

01. 主体使用对象

　　>> Graphics 

02. 各种绘制

　

　　　　 void DrawLine()
        {
            Graphics gp = pnl_1.CreateGraphics();
            Pen pen = new Pen(Color.FromName("blue"));
            gp.DrawLine(pen, 100, 100, 200, 200);
        }

        void DrawRect()
        {
            Graphics gp = pnl_1.CreateGraphics();
            Pen pen = new Pen(Color.FromName("blue"));
            pen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;
            gp.DrawRectangle(pen, 100, 100, 150, 150);
        }

        void DrawCircle()
        {
            Graphics gra = pnl_1.CreateGraphics();
            gra.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
            Pen pen = new Pen(Color.Green);//画笔颜色
            pen.DashStyle = System.Drawing.Drawing2D.DashStyle.DashDot;
            gra.DrawEllipse(pen, 300, 10, 100, 100);//画椭圆的方法，x坐标、y坐标、宽、高，如果是100，则半径为50
        }

        void DrawCircleFilled()
        {
            Graphics gra = pnl_1.CreateGraphics();
            gra.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
            Brush bush = new SolidBrush(Color.Green);//填充的颜色
            gra.FillEllipse(bush, 10, 10, 100, 100);//画填充椭圆的方法，x坐标、y坐标、宽、高，如果是100，则半径为50
        }

        void DrawTest()
        {
            Graphics gra = pnl_1.CreateGraphics();
            Font myFont = new Font("宋体", 24, FontStyle.Bold);
            Brush bush = new SolidBrush(Color.Red);//填充的颜色
            gra.DrawString("测试文本！", myFont, bush, 130, 50);
        }


        /// <summary>
        /// 生成二维码
        /// </summary>
        /// <param name="msg">信息</param>
        /// <param name="version">版本 1 ~ 40</param>
        /// <param name="pixel">像素点大小</param>
        /// <param name="icon_path">图标路径</param>
        /// <param name="icon_size">图标尺寸</param>
        /// <param name="icon_border">图标边框厚度</param>
        /// <param name="white_edge">二维码白边</param>
        /// <returns>位图</returns>
        ///   imagecode("123456", 2, 5, "", 0, 0, false);//生成二维码
        public static Bitmap imagecode(string msg, int version, int pixel, string icon_path, int icon_size, int icon_border, bool white_edge)
        {
            QRCoder.QRCodeGenerator code_generator = new QRCoder.QRCodeGenerator();

            QRCoder.QRCodeData code_data = code_generator.CreateQrCode(msg, QRCoder.QRCodeGenerator.ECCLevel.M/* 这里设置容错率的一个级别 */, true, true, QRCoder.QRCodeGenerator.EciMode.Utf8, version);

            QRCoder.QRCode code = new QRCoder.QRCode(code_data);

            //Bitmap icon = new Bitmap(icon_path);

            // Bitmap bmp = code.GetGraphic(pixel, Color.Black, Color.White, icon, icon_size, icon_border, white_edge);
            //Bitmap bmp = code.GetGraphic(pixel, Color.Black, Color.White, white_edge);
            Bitmap bmp = code.GetGraphic(pixel, Color.Green, Color.White, white_edge);

            return bmp;

        }

        void DrawCode()
        {
            //using System.Drawing;
            //先创建一个画布，来绘制一个宽长为：300，300的画布。
            var imagedata = new Bitmap(300, 300);
            var sourcegra = Graphics.FromImage(imagedata);//存入画布
            sourcegra.DrawString("品牌", new Font("宋体", 20, FontStyle.Regular), new SolidBrush(Color.Red), 20, 100);//在画布绘制字体
            var qrImage = imagecode("123456", 2, 5, "", 0, 0, false);//生成二维码
            sourcegra.DrawImage(qrImage, 100, 100, 100, 100);//绘制二维码到画布
            //imagedata.Save("D://1.jpeg", System.Drawing.Imaging.ImageFormat.Jpeg);//保存图片到D盘
            //将图片赋值给PictureBox
            pic_code.Image = imagedata  ;

            //直接画图片
            Graphics gra = pnl_1.CreateGraphics();
            gra.DrawImage(qrImage, 10, 300, 150, 150);
        }