• C#实现图片叠加,图片上嵌入文字,文字生成图片的方法


    /// <summary>
        /// 图片叠加
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void Button1_Click(object sender, EventArgs e)
        {
            string path = Server.MapPath(@"image/20160102.png");
            System.Drawing.Image imgSrc = System.Drawing.Image.FromFile(path);
            System.Drawing.Image imgWarter = System.Drawing.Image.FromFile(Server.MapPath(@"Image/bear.png"));
            using (Graphics g = Graphics.FromImage(imgSrc))
            {
                g.DrawImage(imgWarter, new Rectangle(imgSrc.Width - imgWarter.Width, imgSrc.Height - imgWarter.Height,  imgWarter.Width,  imgWarter.Height),    0, 0, imgWarter.Width, imgWarter.Height, GraphicsUnit.Pixel);
            }

            string newpath = Server.MapPath(@"Image/WaterMark.bmp");
            imgSrc.Save(newpath, System.Drawing.Imaging.ImageFormat.Jpeg);
            this.image_Water.ImageUrl = @"~/Image/WaterMark.bmp";
        }

        /// <summary>
        /// 图片上嵌入文字
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void Button2_Click(object sender, EventArgs e)
        {
            string path = Server.MapPath(@"image/20160102.png");
            System.Drawing.Image imgSrc = System.Drawing.Image.FromFile(path);

            using (Graphics g = Graphics.FromImage(imgSrc))
            {
                g.DrawImage(imgSrc, 0, 0, imgSrc.Width, imgSrc.Height);
                using (Font f = new Font("宋体", 20))
                {
                    using (Brush b = new SolidBrush(Color.Red))
                    {
                        string addText = "我的地盘我做主";   g.DrawString(addText, f, b, 100, 20);
                    }
                }
            }
            string fontpath = Server.MapPath(@"image/FontMark.bmp");
            imgSrc.Save(fontpath, System.Drawing.Imaging.ImageFormat.Bmp);
            this.image_Water.ImageUrl = @"~/image/FontMark.bmp";

        }

    ////////////////////////////////////////以下为文字生成图片//////////////////////////////////////////////////////////

      /// <summary>
        /// 把文字转换才Bitmap
        /// </summary>
        /// <param name="text"></param>
        /// <param name="font"></param>
        /// <param name="rect">用于输出的矩形,文字在这个矩形内显示,为空时自动计算</param>
        /// <param name="fontcolor">字体颜色</param>
        /// <param name="backColor">背景颜色</param>
        /// <returns></returns>
        private Bitmap TextToBitmap(string text, Font font, Rectangle rect, Color fontcolor, Color backColor)
        {
            Graphics g;
            Bitmap bmp;
            StringFormat format = new StringFormat(StringFormatFlags.NoClip);
            if (rect == Rectangle.Empty)
            {
                bmp = new Bitmap(1, 1);
                g = Graphics.FromImage(bmp);
                //计算绘制文字所需的区域大小(根据宽度计算长度),重新创建矩形区域绘图
                SizeF sizef = g.MeasureString(text, font, PointF.Empty, format);

                int width = (int)(sizef.Width + 1);
                int height = (int)(sizef.Height + 1);
                rect = new Rectangle(0, 0, width, height);
                bmp.Dispose();

                bmp = new Bitmap(width, height);
            }
            else
            {
                bmp = new Bitmap(rect.Width, rect.Height);
            }

            g = Graphics.FromImage(bmp);

            //使用ClearType字体功能
            g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
            g.FillRectangle(new SolidBrush(backColor), rect);
            g.DrawString(text, font, Brushes.Black, rect, format);
            return bmp;
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            string str = @"开始时间:2016-1-1" + " " + "结束时间:2017-1-1"+" "+ "沙尘天气等级:2"+" " + "PM10日均浓度最大值:2ug/m3"+" " + "影响范围:济南,青岛";
            //得到Bitmap(传入Rectangle.Empty自动计算宽高)
            Bitmap bmp = TextToBitmap(str, new Font("Arial", 16), Rectangle.Empty,Color.Black,Color.Wheat);

       
            //保存到桌面save.jpg
            string directory = System.Environment.GetFolderPath(System.Environment.SpecialFolder.DesktopDirectory);
            bmp.Save(directory + "\save.png", ImageFormat.Png);
        }

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  • 原文地址:https://www.cnblogs.com/wlming/p/10198213.html
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