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ATSUI Bounding box

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ATSUI Bounding box

Subject: ATSUI Bounding box
From: Lennart Kudling <email@hidden>
Date: Thu, 9 Mar 2006 19:52:40 +0100

Hi all,

i am the founder of the GPL vector graphics editor Chlor (http:// chlor.sourceforge.net/).

I have difficulties to calculate the exact (device independent) bounding box of text. My code looks like this:

	OSStatus status = noErr;
	ATSTrapezoid trapezoid;

	status = ATSUGetGlyphBounds(
		m_atsuTextLayout,
		FloatToFixed( m_origin->x ),
		FloatToFixed( m_origin->y ),
		kATSUFromTextBeginning,
		kATSUToTextEnd,
		kATSUseFractionalOrigins,
		1,
		&trapezoid,
		NULL );

m_boundingBox = [[CRect alloc] init]; [m_boundingBox setPointX: FixedToFloat( trapezoid.lowerLeft.x ) Y: FixedToFloat( trapezoid.lowerLeft.y )]; [m_boundingBox addPointX: FixedToFloat( trapezoid.upperRight.x ) Y: FixedToFloat( trapezoid.upperRight.y )];

The full source can be seen here: http://cvs.sourceforge.net/ viewcvs.py/chlor/src/CText.m?rev=1.19&view=log

The problem is, that there is some offset (bearing?) as can be seen in the attached screenshot. I tried several ideas but cannot get rid of this offset.

I would be really glad if someone could tell me what i am doing wrong.

Thanks,
Lenny _______________________________________________
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