Problem with TextRenderer.MeasureText

Question

Hey. I am using the TextRenderer.MeasureText () method to measure the text width for a given font. I use the Arial Unicode MS font to measure the width, which is a Unicode font containing characters for all languages. The method returns a different width on different servers. Both machines have Windows 2003 and .net 3.5 SP1.

Here is the code we used

using (Graphics g = Graphics.FromImage(new Bitmap(1, 1)))
{                
    width = TextRenderer.MeasureText(g, word, textFont, new Size(5, 5), TextFormatFlags.NoPadding).Width;
}

Any idea why this is happening?

I am using C # 2.0

Answer 1

MeasureText is not known to be accurate.

Here is the best way:

    protected int _MeasureDisplayStringWidth ( Graphics graphics, string text, Font font )
    {
        if ( text == "" )
            return 0;

        StringFormat format = new StringFormat ( StringFormat.GenericDefault );
        RectangleF rect = new RectangleF ( 0, 0, 1000, 1000 );
        CharacterRange[] ranges = { new CharacterRange ( 0, text.Length ) };
        Region[] regions = new Region[1];

        format.SetMeasurableCharacterRanges ( ranges );
        format.FormatFlags = StringFormatFlags.MeasureTrailingSpaces;

        regions = graphics.MeasureCharacterRanges ( text, font, rect, format );
        rect = regions[0].GetBounds ( graphics );

        return (int)( rect.Right );
    }

Answer 2

//--------------------------------------------------------------------------------------
// MeasureText always adds about 1/2 em width of white space on the right,
// even when NoPadding is specified. It returns zero for an empty string.
// To get the precise string width, measure the width of a string containing a
// single period and subtract that from the width of our original string plus a period.
//--------------------------------------------------------------------------------------

public static Size MeasureText(string Text, Font Font) {
  TextFormatFlags flags
    = TextFormatFlags.Left
    | TextFormatFlags.Top
    | TextFormatFlags.NoPadding
    | TextFormatFlags.NoPrefix;
  Size szProposed = new Size(int.MaxValue, int.MaxValue);
  Size sz1 = TextRenderer.MeasureText(".", Font, szProposed, flags);
  Size sz2 = TextRenderer.MeasureText(Text + ".", Font, szProposed, flags);
  return new Size(sz2.Width - sz1.Width, sz2.Height);
}

Answer 3

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