.NET(C#) 通过文字和logo图片生成视频封面

实现代码：

public void ConvertTextFileToImage(string title, string content, string logoPath, string imageFile){    Bitmap newBitmap = null;    Graphics g = null;    try    {        Font titleFont = new Font("宋体", 50);        Font contentFont = new Font("宋体", 30);        newBitmap = new Bitmap(1920, 1080, PixelFormat.Format32bppArgb);        using (var logoFile = Image.FromFile(logoPath))//logo图片        {            g = Graphics.FromImage(newBitmap);            int rowHeight = (int)(Math.Ceiling(g.MeasureString("位置", titleFont).Height));            Rectangle recangleTitle = new Rectangle(0, 0, 1920, rowHeight);            //标题            DrawStringTitle(g, titleFont, title, recangleTitle, logoFile.Height + 100);            //描述内容            Rectangle recangle = new Rectangle(0, 0, 1920, 1080 - rowHeight);            DrawStringWrap(g, contentFont, content, recangle, rowHeight + logoFile.Height + 200);            //logo图片            g.DrawImage(logoFile, new Rectangle((1920 - logoFile.Width) / 2, 30, logoFile.Width, logoFile.Height));            // MemoryStream tempStream = new MemoryStream();            newBitmap.Save(imageFile, ImageFormat.Png);        }    }    finally    {        if (g != null) g.Dispose();        if (newBitmap != null) newBitmap.Dispose();    }}/// <summary>/// 绘制文本自动换行（超出截断）/// </summary>/// <param name=\"graphic\">绘图图面</param>/// <param name=\"font\">字体</param>/// <param name=\"text\">文本</param>/// <param name=\"recangle\">绘制范围</param>private void DrawStringWrap(Graphics graphic, Font font, string text, Rectangle recangle, int top = 0){    List<string> textRows = GetStringRows(graphic, font, text, recangle.Width);    int rowHeight = (int)(Math.Ceiling(graphic.MeasureString("测试", font).Height));    int maxRowCount = recangle.Height / rowHeight;    int drawRowCount = (maxRowCount < textRows.Count) ? maxRowCount : textRows.Count;    //int top = (recangle.Height - rowHeight * drawRowCount) / 2;    //int top = 0;    StringFormat sf = new StringFormat();    sf.Alignment = StringAlignment.Near;    sf.LineAlignment = StringAlignment.Center;    for (int i = 0; i < drawRowCount; i++)    {        Rectangle fontRectanle = new Rectangle(recangle.Left, top + rowHeight * i, recangle.Width, rowHeight);        graphic.DrawString(textRows[i], font, new SolidBrush(Color.Black), fontRectanle, sf);    }}/// <summary>/// 绘制居中的标题（超出截断）/// </summary>/// <param name=\"graphic\">绘图图面</param>/// <param name=\"font\">字体</param>/// <param name=\"text\">文本</param>/// <param name=\"recangle\">绘制范围</param>private void DrawStringTitle(Graphics graphic, Font font, string text, Rectangle recangle, int top = 0){    List<string> textRows = GetStringRows(graphic, font, text, recangle.Width);    int rowHeight = (int)(Math.Ceiling(graphic.MeasureString("测试", font).Height));    int maxRowCount = recangle.Height / rowHeight;    int drawRowCount = (maxRowCount < textRows.Count) ? maxRowCount : textRows.Count;    //int top = (recangle.Height - rowHeight * drawRowCount) / 2;    //int top = 0;    StringFormat sf = new StringFormat();    sf.Alignment = StringAlignment.Center;    sf.LineAlignment = StringAlignment.Center;    for (int i = 0; i < drawRowCount; i++)    {        Rectangle fontRectanle = new Rectangle(recangle.Left, top + rowHeight * i, recangle.Width, rowHeight);        graphic.DrawString(textRows[i], font, new SolidBrush(Color.Black), fontRectanle, sf);    }}/// <summary>/// 将文本分行/// </summary>/// <param name=\"graphic\">绘图图面</param>/// <param name=\"font\">字体</param>/// <param name=\"text\">文本</param>/// <param name=\"width\">行宽</param>/// <returns></returns>private List<string> GetStringRows(Graphics graphic, Font font, string text, int width){    int RowBeginIndex = 0;    int rowEndIndex = 0;    int textLength = text.Length;    List<string> textRows = new List<string>();    for (int index = 0; index < textLength; index++)    {        rowEndIndex = index;        if (index == textLength - 1)        {            textRows.Add(text.Substring(RowBeginIndex));        }        else if (rowEndIndex + 1 < text.Length && text.Substring(rowEndIndex, 1) == "\n")        {            textRows.Add(text.Substring(RowBeginIndex, rowEndIndex - RowBeginIndex));            rowEndIndex = index += 1;            RowBeginIndex = rowEndIndex;        }        else if (graphic.MeasureString(text.Substring(RowBeginIndex, rowEndIndex - RowBeginIndex + 1), font).Width > width)        {            textRows.Add(text.Substring(RowBeginIndex, rowEndIndex - RowBeginIndex));            RowBeginIndex = rowEndIndex;        }    }    return textRows;}

调用示例：

 ConvertTextFileToImage(".NET(C#)new关键字的三种用法", "new是我们大家所熟知的英文单词，但在C#中，它是一个关键字，它可以做运算符，也可以做修饰符，还可以用在泛型T参数约束中。下面我们来介绍一下这3种用法。", @"E:\softwaredir\\img\logo.png", @"E:\softwaredir\\img\th.png");