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Re: about contibuting to octave

From: Ben Abbott
Subject: Re: about contibuting to octave
Date: Thu, 12 Mar 2009 16:53:12 +0800

On Mar 11, 2009, at 2:37 PM, xianghang liu wrote:

Two functions below are two methods of computing bounding box of a text object. I wrote them following algorithms used in GD and Freetype. Only a slight diiference is between them. It is the computation of bounding box of a charachter. And the final result of them are slightly different as well.
Please tell me if you find any mistakes or have suggestions.

I'm confused by what is meant by "bounding box", and as I'm unfamiliar with FreeType (and have poor c++ skills) I'm uncertain that this implementation will result in what is expected for the text object property, "extent".

Consider the three examples below (from Matlab).

>> h1 = text(0,0,'_','interpreter','none','units','points','fontsize', 12); >> h2 = text(0,0,'|','interpreter','none','units','points','fontsize', 12); >> h3 = text(0,0,'-','interpreter','none','units','points','fontsize', 12);
>> get(h1,'extent')

ans =

            0         -8.8          8.8           16

>> get(h2,'extent')

ans =

            0         -8.8          5.6           16

>> get(h3,'extent')

ans =

            0         -8.8          6.4           16

The choice of character only impacts the width of the extent. The lower left corner and height of the extent is constant.

Does your implementation produce such a result, or does it produce a bounding box representing the smallest box that encompasses the text object?


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