C# 在图片上写字，在图片上画线

以下代码实现在图片上写字，在图片上画线：

/// <summary>
/// 在图片上写字
/// </summary>
/// <param name="img">原图</param>
/// <param name="words">要写的内容</param>
/// <param name="font">字体</param>
/// <param name="brush">笔刷</param>
/// <param name="x">横坐标</param>
/// <param name="y">纵坐标</param>
/// <returns></returns>
public static Image DrawWordsOnPicture(Image img,string words,Font font,Brush brush,int x,int y)
{
    Graphics g = Graphics.FromImage(img);
    PointF p = new PointF(x, y);
    g.DrawString(words, font, brush, p);
    return img;
}
/// <summary>
/// 在图片上画线
/// </summary>
/// <param name="img">原图</param>
/// <param name="color">颜色</param>
/// <param name="brushWidth">笔刷宽度</param>
/// <param name="startX">起始横坐标</param>
/// <param name="startY">起始纵坐标</param>
/// <param name="endX">结束横坐标</param>
/// <param name="endY">结束纵坐标</param>
/// <returns></returns>
public static Image DrawLineOnPicture(Image img,Color color,int brushWidth,int startX,int startY,int endX,int endY)
{
    Graphics g = Graphics.FromImage(img);
    Pen pen = new Pen(color, brushWidth);
    g.DrawLine(pen, startX, startY, endX, endY);
    return img;
}