protected void Page_Load(object sender, EventArgs e)
{
//if (string.IsNullOrWhiteSpace(txt) || txt.Length > 500) { }
FontConfig cfg = new FontConfig();
cfg.text = txt.Length > 25 ? txt.Substring(0, 25) : txt;
cfg.size = Convert.ToInt32(Req("size", cfg.size.ToString()));
cfg.family = Req("family", cfg.family);
cfg.color = Req("color", cfg.color);
//仅接受16位传参
cfg.bkcolor = Req("bkcolor", cfg.bkcolor);
cfg.width = DataConverter.CLng(Req("width", cfg.width.ToString()));
if (!cfg.bkcolor.StartsWith("#"))
{
cfg.bkcolor = "#" + cfg.bkcolor;
}
if (!cfg.color.StartsWith("#"))
{
cfg.color = "#" + cfg.color;
}
CreateImage(cfg);
}
private void CreateImage(FontConfig cfg)
{
int margin = cfg.size / 4; //每个字之间的间距
int mapwidth = (int)(cfg.text.Length * (cfg.size + (cfg.size / 4) + margin)); //必须加大些宽高,否则文字显示不全
Bitmap map = new Bitmap(mapwidth, cfg.size + (cfg.size / 2)); //创建图片背景
Graphics graph = Graphics.FromImage(map);
graph.Clear(colorHx16toRGB(cfg.bkcolor));//清除画面，填充背景
try
{
char[] chars = cfg.text.ToCharArray();//拆散字符串成单字符数组
StringFormat format = new StringFormat(StringFormatFlags.NoClip);
format.Alignment = StringAlignment.Center;
format.LineAlignment = StringAlignment.Center;
//定义字体
for (int i = 0; i < chars.Length; i++)
{
Font f = new System.Drawing.Font(cfg.family, cfg.size, System.Drawing.FontStyle.Regular);//字体样式(参数2为字体大小)
Brush b = new System.Drawing.SolidBrush(colorHx16toRGB(cfg.color));
Point dot = new Point(cfg.size, cfg.size);
graph.TranslateTransform(dot.X, dot.Y); //移动光标到指定位置
graph.DrawString(chars[i].ToString(), f, b, 1, -3, format);
graph.TranslateTransform(margin, -dot.Y); //移动光标到指定位置，每个字符紧凑显示，避免被软件识别
}
//生成图片
System.IO.MemoryStream ms = new System.IO.MemoryStream();
map.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
Response.Cache.SetNoStore();
Response.ClearContent();
Response.ContentType = "image/gif";
Response.BinaryWrite(ms.ToArray());
}
catch { }
finally { graph.Dispose(); map.Dispose(); }
}
