On Thu, Mar 12, 2009 at 8:53 AM, Ben Abbott <
address@hidden> wrote:
>
> 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.