Re: factor=fit images don't fit

[Giuseppe Bilotta <gip.bilotta@iol.it>]

Friday, July 20, 2007 Giuseppe Bilotta wrote:

> Hello all,

> I have to place a number of images into some given-size
> frames in a layer. The images should be scaled
> proportionally to fit into the frame. The code I'm working
> with is:

> \defineframed[framedimg][
>   frame=on,framecolor=elux,
>   background=color,
>   backgroundcolor=white,
>   width=\wdfig,
>   height=\htfigone,
>   offset=overlay,
> ]

> \setlayer[figs][voffset=\nextfigvoff]{%
>   \framedimg{%
>     \externalfigure[#1][
>       factor=fit,
>       % maxwidth=\wdfig,
>       % maxheight=\htfigone,
>       % frame=on,
>     ]%
>   }%
> }%

> where \wdfig, \htfigone are the frame size and \nextfigvoff
> is the vertical offset which must be placed. I've tried
> factor=fit, factor=max, but in both cases I get images which
> cross the boundaries of the frame, mostly in the horizontal
> direction. If I add the maxwidth/maxheight specification,
> images don't get scaled at all.

> I would expect factor=fit to scale the image in such a way
> that the biggest direction fits into the enclosing box,
> while factor=max would scale the image in such a way that
> the smallest direction fits into the enclosing box. Instead,
> in both cases the vertical direction is being fitted, with
> no apparent consideration for the horizontal direction.

> What am I doing wrong and what should I do to fix it?

Ok, I've tried studying the source and I really think that
the way factor scaling is computed is wrong. However, the
fix is nontrivial, and a somewhat thorough checking should
be implemented, with earlier check for the factor value
(fit, max, broad), since the logic selecting which dimension
to scale depends on the kind of scaling.

Anyway, I've found a temporary solutin to my problem by
using a very large value of scale=, coupled with appropriate
maxwidth and maxheight values.

-- 
Giuseppe "Oblomov" Bilotta

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