asp.net中利用Matrix矩阵来旋转文字

绘制倾斜文字的ASP.NET示例

最新推荐文章于 2022-10-28 11:21:15 发布

原创最新推荐文章于 2022-10-28 11:21:15 发布 · 1.2k 阅读

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#matrix #asp.net #random #string #object #float

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      protected void Page_Load(object sender, EventArgs e)
        {
            DrawInclineText("万里长城永不倒");
        }
private void DrawInclineText(string str)
        {
            if (str.Length > 0)
            {
                Bitmap bmp = new Bitmap(160, 30);
                Graphics g = Graphics.FromImage(bmp);
                g.CompositingQuality = CompositingQuality.HighQuality;
                g.InterpolationMode = InterpolationMode.High;
                g.SmoothingMode = SmoothingMode.HighQuality;
                g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
                g.Clear(Color.Transparent);

                string temp;
                for (int i = 0; i < str.Length; i++)
                {
                    temp = str.Substring(i, 1);
                    Matrix mat = new Matrix();//Matrix这个东西很厉害
                    mat.RotateAt((float)GetRandomAngle(), new PointF(20f * i, 15));//旋转
                    g.Transform = mat;//设置旋转
                    g.DrawString(temp, new Font("Arail",14f,FontStyle.Bold), new SolidBrush(Color.White), new PointF(20f * i, 2));

}

                bmp.Save(Response.OutputStream, ImageFormat.Jpeg);
                bmp.Dispose();
                g.Dispose();
            }
        }
        /// <summary>
        /// 获取随机角度
        /// </summary>
        /// <returns></returns>
        private int GetRandomAngle()
        {
            Random rand = new Random((int)DateTime.Now.Ticks);
            System.Threading.Thread.Sleep(50);//这里如果程序执行太快，就会产生相同的随机数，所以需要延时。
            int tmp = rand.Next(-20, 20);
            return tmp;
        }