How to adjust size of programatically created Bitmap to match text drawn on it?
- by TooFat
I have the following .ashx page that takes some query string parameters and returns a bitmap with the specified text written on it.
The problem I have is that I am currently just manually setting the initial size of the bitmap at 100 X 100 when what I really want is to have the bitmap be just big enough to include all the text that was written to it.
How can I do this?
public void ProcessRequest (HttpContext context) {
context.Response.ContentType = "image/png";
string text = context.Request.QueryString["Text"];
//set FontName
string fontName;
if (context.Request.QueryString["FontName"] != null)
{
fontName = context.Request.QueryString["FontName"];
}
else
{
fontName = "Arial";
}
//Set FontSize
int fontEms;
if (context.Request.QueryString["FontSize"] != null)
{
string fontSize = context.Request.QueryString["FontSize"];
fontEms = Int32.Parse(fontSize);
}
else
{
fontEms = 12;
}
//Set Font Color
System.Drawing.Color color;
if (context.Request.QueryString["FontColor"] != null)
{
string fontColor = context.Request.QueryString["FontColor"];
color = System.Drawing.ColorTranslator.FromHtml(fontColor);
context.Response.Write(color.ToString());
}
else
{
color = System.Drawing.Color.Red;
}
using (System.Drawing.Text.PrivateFontCollection fnts = new System.Drawing.Text.PrivateFontCollection())
using (System.Drawing.FontFamily fntfam = new System.Drawing.FontFamily(fontName))
using (System.Drawing.SolidBrush brush = new System.Drawing.SolidBrush(color))
using (System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(100, 100))
{
using (System.Drawing.Font fnt = new System.Drawing.Font(fntfam, fontEms))
{
fnts.AddFontFile(System.IO.Path.Combine(@"C:\Development\Fonts\", fontName));
System.Drawing.Graphics graph = System.Drawing.Graphics.FromImage(bmp);
graph.DrawString(text, fnt, brush, new System.Drawing.Point(0, 0));
string imgPath = System.IO.Path.Combine(@"C:\Development\MyPath\Images\Text", System.IO.Path.GetRandomFileName());
bmp.Save(imgPath);
context.Response.WriteFile(imgPath);
}
}
}
