How to scale text when drawing to an Image with c#

Question

I would like to draw some text in a rectangle and have it scale to the maximum size that fits within the rectangle.

So far I have this:

    Bitmap bitmapImage = new Bitmap(500, 500);
    Graphics graphicImage = Graphics.FromImage(bitmapImage); 
    graphicImage.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;

    var rect = new Rectangle(0, 0, 500, 500);

    graphicImage.DrawString( "testing testing 123!", new Font("Arial", 12, FontStyle.Bold), Brushes.Black, rect);               
    bitmapImage.Save("test.png");

it draws the text but doesn't scale up the font size.

No sign of Graphics.ScaleTransform() in your snippet. Finding the right arguments to pass to it is the // todo comment. Measure the string. — Hans Passant
– Hans Passant, Commented Dec 25, 2010 at 0:11

fejesjoco · Accepted Answer · 2010-12-24 21:41:03Z

1

Call Graphics.MeasureString in a binary search loop.

answered Dec 24, 2010 at 21:41

fejesjoco

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2 Comments

Corin Blaikie Over a year ago

Ouch, I was hoping for something in the .net framework instead of having to do it manually.

fejesjoco Over a year ago

Hans mentioned ScaleTransform, in that case, draw the string once, measure it, then scale it, much simpler.

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