[question] \clipping some data from a pdf

[question] \clipping some data from a pdf

[Floris van Manen]

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Does anyone know?

Using the latest LMTX, i try to clip some portion of an external  pdf
page, then resize that portion on top a new page.
i use the \clip command.

\starttext
\scale[width=100mm, hwight=100mm]{\clip[width=150mm, height=120mm,
hoffset=30mm, voffset=40mm]{\externalfigure[drawing.pdf]}} % incorrect

\scale[width=100mm, hwight=100mm]{\clip[width=150mm, height=120mm,
hoffset=30mm, voffset=136mm]{\externalfigure[drawing.pdf]}} % correct
\stoptext

I noticed that the voffset parameter *always* counts from the top/left
of the external source. Also if the source has its origin defined at the
lower/left corner.
Is that intentional?

It is confusing as when i place a rectangle on top of the clip i want to
extract from the source pdf, the x,w,w,h of that rectangle will not
match the parameter needed for the \clip command.

Or does there happen to be some snazzy tool out there to get the
coordinates of embedden images within a pdf?

.Floris


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Re: [question] \clipping some data from a pdf

[Henning Hraban Ramm]

> Am 2020-01-29 um 00:27 schrieb Floris van Manen <vm@klankschap.nl>:
> Or does there happen to be some snazzy tool out there to get the
> coordinates of embedden images within a pdf?

In case the "right" size of your image is defined as one of the PDF boxes (MediaBox, TrimBox, CropBox, ArtBox), you can set \externalfigure[drawing][size=art] (size=none/media/crop/trim/art).

Best, Hraban
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Re: [question] \clipping some data from a pdf

[Aditya Mahajan]

On Wed, 29 Jan 2020, Henning Hraban Ramm wrote:

>
>> Am 2020-01-29 um 00:27 schrieb Floris van Manen <vm@klankschap.nl>:
>> Or does there happen to be some snazzy tool out there to get the
>> coordinates of embedden images within a pdf?
>
> In case the "right" size of your image is defined as one of the PDF boxes (MediaBox, TrimBox, CropBox, ArtBox), you can set \externalfigure[drawing][size=art] (size=none/media/crop/trim/art).

This was documented at 
https://www.contextgarden.net/Command/useexternalfigure

but I also added a short description at 
https://www.contextgarden.net/Using_Graphics

Aditya
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