how can I use framewidth in calculations

how can I use framewidth in calculations

[Thomas A. Schmitz]

Hi all,

maybe I'm overlooking something obvious, but...: when I have a figure, I 
can calculate its width dependent on the page width, and it will adapt:

\starttext

\externalfigure[cow][width=0.6\textwidth]

\stoptext

But is there a method for similar calculations inside a frame? Here's 
what I tried, but it doesn't give the expected result (the image is much 
smaller than expected):

\starttext

\framed[width=7cm]{\externalfigure[cow][width=\the\dimexpr0.9\framedparameter{width}\relax]}

\stoptext

Thanks for any pointers!

Thomas
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Re: how can I use framewidth in calculations

[Rogers, Michael K]

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On Mar 23, 2012, at 6:55 PM, Thomas A. Schmitz wrote:

But is there a method for similar calculations inside a frame? Here's what I tried, but it doesn't give the expected result (the image is much smaller than expected):

\starttext

\framed[width=7cm]{\externalfigure[cow][width=\the\dimexpr0.9\framedparameter{width}\relax]}

\stoptext

Thanks for any pointers!

Thomas

Try

\framed[width=7cm]{\externalfigure[cow][width=\dimexpr\framedparameter{width}*9/10]}

[I don't understand \dimexpr.   For instance 7cm = ~198pt, 0.9 * 7 cm = ~179pt, but \dimexpr0.9\framedparameter{width} yields 27.5992pt.  It doesn't seem to work well with decimals.  No wiki page for it, that I can find.]

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Re: how can I use framewidth in calculations

[Thomas A. Schmitz]

On 03/24/12 03:27, Rogers, Michael K wrote:
> Try
>
> \framed[width=7cm]{\externalfigure[cow][width=\dimexpr\framedparameter{width}*9/10]}
>
> [I don't understand \dimexpr.   For instance 7cm = ~198pt, 0.9 * 7 cm =
> ~179pt, but \dimexpr0.9\framedparameter{width} yields 27.5992pt.  It
> doesn't seem to work well with decimals.  No wiki page for it, that I
> can find.]

Thank you, that is exactly what I needed! I'll see if I can find some 
more information about \dimexpr now!

All best

Thomas
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Re: how can I use framewidth in calculations

[Herbert Voss]

Am 24.03.2012 08:30, schrieb Thomas A. Schmitz:
> On 03/24/12 03:27, Rogers, Michael K wrote:
>> Try
>>
>> \framed[width=7cm]{\externalfigure[cow][width=\dimexpr\framedparameter{width}*9/10]}
>>
>>
>> [I don't understand \dimexpr. For instance 7cm = ~198pt, 0.9 * 7 cm =
>> ~179pt, but \dimexpr0.9\framedparameter{width} yields 27.5992pt. It
>> doesn't seem to work well with decimals. No wiki page for it, that I
>> can find.]
>
> Thank you, that is exactly what I needed! I'll see if I can find some
> more information about \dimexpr now!

\framed[width=7cm]{\externalfigure[cow][width=0.75\expandafter\dimexpr\framedparameter{width}]}

works for me

Herbert
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Re: how can I use framewidth in calculations

[Thomas A. Schmitz]

On 03/24/12 08:44, Herbert Voss wrote:
> \framed[width=7cm]{\externalfigure[cow][width=0.75\expandafter\dimexpr\framedparameter{width}]}
>
>
> works for me
>
> Herbert

Ooh, expansion, my old nemesis, strikes again! Thanks, that works too - 
this is one of the many aspects of TeX that I have never really grasped...

Thanks!

Thomas
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Re: how can I use framewidth in calculations

[Hans Hagen]

On 24-3-2012 08:44, Herbert Voss wrote:
> Am 24.03.2012 08:30, schrieb Thomas A. Schmitz:
>> On 03/24/12 03:27, Rogers, Michael K wrote:
>>> Try
>>>
>>> \framed[width=7cm]{\externalfigure[cow][width=\dimexpr\framedparameter{width}*9/10]}
>>>
>>>
>>>
>>> [I don't understand \dimexpr. For instance 7cm = ~198pt, 0.9 * 7 cm =
>>> ~179pt, but \dimexpr0.9\framedparameter{width} yields 27.5992pt. It
>>> doesn't seem to work well with decimals. No wiki page for it, that I
>>> can find.]
>>
>> Thank you, that is exactly what I needed! I'll see if I can find some
>> more information about \dimexpr now!
>
> \framed[width=7cm]{\externalfigure[cow][width=0.75\expandafter\dimexpr\framedparameter{width}]}

there is no need for \expandafter here as \dimexpr will expand what 
comes after it anyway


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Re: how can I use framewidth in calculations

[Wolfgang Schuster]

Am 23.03.2012 um 23:55 schrieb Thomas A. Schmitz:

> Hi all,
> 
> maybe I'm overlooking something obvious, but...: when I have a figure, I can calculate its width dependent on the page width, and it will adapt:
> 
> \starttext
> 
> \externalfigure[cow][width=0.6\textwidth]
> 
> \stoptext
> 
> But is there a method for similar calculations inside a frame? Here's what I tried, but it doesn't give the expected result (the image is much smaller than expected):
> 
> \starttext
> 
> \framed[width=7cm]{\externalfigure[cow][width=\the\dimexpr0.9\framedparameter{width}\relax]}
> 
> \stoptext
> 
> Thanks for any pointers!

\starttext

\framed[width=7cm]{\externalfigure[cow][width=0.5\dimexpr\framedwidth\relax]}

\stoptext

Wolfgang
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Re: how can I use framewidth in calculations

[Wolfgang Schuster]

Am 23.03.2012 um 23:55 schrieb Thomas A. Schmitz:

> Hi all,
> 
> maybe I'm overlooking something obvious, but...: when I have a figure, I can calculate its width dependent on the page width, and it will adapt:
> 
> \starttext
> 
> \externalfigure[cow][width=0.6\textwidth]
> 
> \stoptext
> 
> But is there a method for similar calculations inside a frame? Here's what I tried, but it doesn't give the expected result (the image is much smaller than expected):
> 
> \starttext
> 
> \framed[width=7cm]{\externalfigure[cow][width=\the\dimexpr0.9\framedparameter{width}\relax]}
> 
> \stoptext

When you set a value for the align-key the \framed command uses a \vbox for the content and you can use \hsize for the width.

\starttext
\framed[width=7cm,align=middle]{\externalfigure[cow][width=0.9\hsize]}
\stoptext

Wolfgang
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