asp.net将文字绘制成图片

来源：互联网发布：阿里云搭建web服务器编辑：程序博客网时间：2024/06/04 17:49

可以将字符串输出为位图，并在前台页面显示。同时支持自动换行。

调用代码：其中，str为要输出的文本。

                Bitmap newBitmap = null;                Graphics g = null;                string str = allTextTrans;                try                {                    Font strFont = new Font("宋体", 12);                    newBitmap = new Bitmap(800, 1000, PixelFormat.Format32bppArgb);                    g = Graphics.FromImage(newBitmap);                    Rectangle recangle = new Rectangle(0, 0, 800, 1000);                    DrawStringWrap(g, strFont, allTextTrans, recangle);                    MemoryStream tempStream = new MemoryStream();                    newBitmap.Save(tempStream, ImageFormat.Png);                    Response.ClearContent();                    Response.ContentType = "image/png";                    Response.BinaryWrite(tempStream.ToArray());                    Response.End();                }                finally                {                    if (g != null) g.Dispose();                    if (newBitmap != null) newBitmap.Dispose();                }

绘制和分行函数：

/// <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)        {            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>        /// 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;        }    }

展示效果：

参考资料：http://blog.163.com/gsrwsh@126/blog/static/75794506201061492755492/

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