我目前在使用 .Net 中的 System.Drawing.Graphics.DrawString() 方法,在图像上绘制文本,然后将其保存为新文件:
// define image file paths
string sourceImagePath = HttpContext.Current.Server.MapPath("~/img/sourceImage.jpg");
string destinationImagePath = HttpContext.Current.Server.MapPath("~/img/") + "finalImage.jpg";
// create new graphic to draw to
Bitmap bm = new Bitmap(200, 200);
Graphics gr = Graphics.FromImage(bm);
// open and draw image into new graphic
System.Drawing.Image sourceImage = System.Drawing.Image.FromFile(sourceImagePath, true);
gr.DrawImage(sourceImage, 0, 0);
sourceImage.Dispose();
// write "my text" on center of image
gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
StringFormat sf = new StringFormat();
sf.Alignment = StringAlignment.Center;
PrivateFontCollection fontCollection = new PrivateFontCollection();
fontCollection.AddFontFile(HttpContext.Current.Server.MapPath("~/fonts/HelveticaNeueLTStd-BlkCn.ttf"));
// prototype (1)
gr.DrawString("my text", new Font(fontCollection.Families[0], 14, FontStyle.Bold), new SolidBrush(Color.FromArgb(255, 255, 255)), 100, 0, sf);
fontCollection.Dispose();
// save new image
if (File.Exists(destinationImagePath))
{
File.Delete(destinationImagePath);
}
bm.Save(destinationImagePath);
bm.Dispose();
gr.Dispose();
这种在图像上添加文本的方法似乎不能提供一种(我所知道的)给文本添加描边的方式。例如,我真正需要做的是在图像上书写的文本上添加一个特定颜色的2px描边。
如何使用 .Net Framework <= v3.5 实现这一点?