Re: generating fonts for links

On Mon, Feb 24, 2003 at 01:10:36PM +0700, The Thanh Han wrote:
> Hi,
> 
> sorry to bother again. I was trying to understand how it works by reading
> the sources:
> 
> for each letter, a PS page of A4 size is generated. The letter is drawn
> at 392.9619pt, with the staring point at (100,300) from the left-bottom
> corner. Two rectangles are drawn at (100,0)x(X,120) and (100,722)x(X,842),
> where X is the width of the letter being drawn. the PS page is converted to
> bitmap, and cropped to the region limited by those two above rectangles.
> the clip program is used to detract some space from the top and bottom.
> 
> >From the ps file, it looks that the baseline (300 - 120 = 180) is not 5/24
> of the image height (722 - 120 = 602). It seems that the clip program
> detracts further space from the bitmap, to make the baseline = 5/24 the
> image height. Why is it needed? Isn't it simpler to set the baseline to the
> exact value while creating the ps page? 

No. There is no reason why it's this way. It just developed this way. The ps
page is not a final product.

> 
> It looks like clip.c detracts the top and bottom space based on the value
> of hundred_dpi, top_promile and bot_promile. How those are calculated?
> 
> You told me that the result images should have height=112. I looked at the
> images coming with links, and it looks that some fonts have height=112, and
> some have height=120. When one should use 120 and when 112?

It doesn't matter what height you use. Small wil have jagged outlines
and big will take up too much space.

Cl<
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