C#实现在底图上动态生成文字和图片

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/// <summary> /// 在底图上画指定路径的图片 /// </summary> /// <param name="g">画板实例</param> /// <param name="path">图片路径</param> /// <param name="totalWidth">画区总长度</param> /// <param name="totalHeight">画区总高度</param> /// <param name="px">起点X坐标</param> /// <param name="py">起点Y坐标</param>    private void FontPic( ref Graphics g, string path, int totalWidth, int totalHeight, int px, int py)    {     if (File.Exists(path))     {      var pImg = Image.FromFile(path);      //如果图片大于画布区域，则缩小      if (totalHeight < pImg.Height && totalWidth < pImg.Width)      {       Image newPic = GetReducedImage(pImg, totalWidth, totalHeight);       if (newPic != null )       {        DrawPic( ref g, totalWidth, totalHeight, px, py, newPic);       }      }      else if (totalHeight < pImg.Height && totalWidth >= pImg.Width)      {       Image newPic = GetReducedImage(pImg, pImg.Width, totalHeight);       if (newPic != null )       {        DrawPic( ref g, totalWidth, totalHeight, px, py, newPic);       }      }      else if (totalHeight >= pImg.Height && totalWidth < pImg.Width)      {       Image newPic = GetReducedImage(pImg, totalWidth, pImg.Height);       if (newPic != null )       {        DrawPic( ref g, totalWidth, totalHeight, px, py, newPic);       }      }      else      {       DrawPic( ref g, totalWidth, totalHeight, px, py, pImg);      }     }    }    /// <summary>    /// 在图上画图片    /// </summary>    /// <param name="g">画板实例</param>    /// <param name="totalWidth">画区总长度</param>    /// <param name="totalHeight">画区总高度</param>    /// <param name="px">起点X坐标</param>    /// <param name="py">起点Y坐标</param>    /// <param name="pImg">要画的图片实例</param>    private void DrawPic( ref Graphics g, int totalWidth, int totalHeight, int px, int py, Image pImg)    {     px += GetValue(totalWidth, pImg.Width);     py += GetValue(totalHeight, pImg.Height);        g.DrawImage( new Bitmap(pImg, new Size(GetSize(totalWidth, pImg.Width), GetSize(totalHeight, pImg.Height))),      new Rectangle(px, py, totalWidth, totalHeight),      0, 0, totalWidth, totalHeight, GraphicsUnit.Pixel);    }    /// <summary>    /// 生成缩略图重载方法1，返回缩略图的Image对象    /// </summary>    /// <param name="width">缩略图的宽度</param>    /// <param name="height">缩略图的高度</param>    /// <returns>缩略图的Image对象</returns>    public Image GetReducedImage(Image resourceImage, int width, int height)    {     try     {      Image data = null ;      //用指定的大小和格式初始化Bitmap类的新实例      using (Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb))      {       //从指定的Image对象创建新Graphics对象       using (Graphics graphics = Graphics.FromImage(bitmap))       {        //清除整个绘图面并以透明背景色填充        //graphics.Clear(Color.Transparent);        //在指定位置并且按指定大小绘制原图片对象        graphics.DrawImage(resourceImage, new Rectangle(0, 0, width, height));       }       data = new Bitmap(bitmap);      }      return data;     }     catch (Exception e)     {      throw e;     }    }    /// <summary>    /// 比较两个值，得到给到给定值（判断是否越界）    /// </summary>    /// <param name="total">总长度</param>    /// <param name="width">指定长度</param>    /// <returns></returns>    public int GetSize( int total, int width)    {     if (total > width)     {      return width;     }     else     {      return total;     }    }    /// <summary>    /// 更加传入的值计算得到新值（计算点坐标）    /// </summary>    /// <param name="total">总长度</param>    /// <param name="width">指定长度</param>    /// <returns></returns>    private int GetValue( int total, int width)    {     return (total - width) / 2;    }    /// <summary>    /// 在图片上画出文字    /// </summary>    /// <param name="g">图片对象</param>    /// <param name="pointX">文字x坐标</param>    /// <param name="pointY">文字y坐标</param>    /// <param name="word">文字内容</param>    /// <param name="textWidth">文本宽度</param>    /// <param name="textHeight">文本高度</param>    private static void DrawStringWord(Graphics g, int pointX, int pointY, string word, int textWidth, int textHeight, int fontSize = 30)    {     Font font = new Font( "微软雅黑" , fontSize, (FontStyle.Regular));     RectangleF textArea = new RectangleF(pointX, pointY, textWidth, textHeight);     Brush brush = new SolidBrush(Color.Black);     g.DrawString(word, font, brush, textArea);    }