C#实现在底图上动态生成文字和图片

/// <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);  }