From: Wolfgang Schuster <schuster.wolfgang@googlemail.com>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: Background using Image Overlay
Date: Tue, 8 Nov 2011 06:31:25 +0100 [thread overview]
Message-ID: <1EF34C3F-B50E-49B1-847C-6823AB20D750@googlemail.com> (raw)
In-Reply-To: <CAFy9bANEpWzA9Hr=4LO9t=yUkCoTrt=H7_Lqnm7JKbKny=4d2w@mail.gmail.com>
Am 08.11.2011 um 04:45 schrieb Syed N Haider:
> Hi All
> I am new to the Metapost and Context world, and need some help regarding the inclusion of Metapost graphics in ConTeXt documents. I am trying a very simple approach, using a graphic as a background. Here's my sample (using a very basic metapost graphic as a page background in a document):
>
> Metapost:
> ========
> beginfig(0);
> theta := 360/7;
> radius := 1in;
> z0 = origin;
> z1 = z0 + dir(90)*radius;
> z2 = z0 + dir(90 + theta)*radius;
> z3 = z0 + dir(90 + 2*theta)*radius;
> z4 = z0 + dir(90 + 3*theta)*radius;
> z5 = z0 + dir(90 + 4*theta)*radius;
> z6 = z0 + dir(90 + 5*theta)*radius;
> z7 = z0 + dir(90 + 6*theta)*radius;
> draw z1 -- z2 -- z3 -- z4 -- z5 -- z6 -- z7
> -- cycle;
> endfig;
> end;
>
>
>
> ConTeXt (after running mpost on the metapost graphic to generate the hexagon.0 file):
> =====================================================================
>
> \defineoverlay
> [backg]
> [{\externalfigure[hexagon.0][width=\overlaywidth,height=\overlayheight]}]
>
> \starttext
> \noheaderandfooterlines
> \setupbackgrounds[page][background=backg]
> %\placefigure
> %{none}
> %{\externalfigure[hexagon.0][width=12cm]}
> \stoptext
With ConTeXt you can include your MetaPost code in the document and the graphic is generated at runtime.
\startuseMPgraphic{hexagon}
theta := 360/7;
radius := 1in;
z0 = origin;
z1 = z0 + dir(90)*radius;
z2 = z0 + dir(90 + theta)*radius;
z3 = z0 + dir(90 + 2*theta)*radius;
z4 = z0 + dir(90 + 3*theta)*radius;
z5 = z0 + dir(90 + 4*theta)*radius;
z6 = z0 + dir(90 + 5*theta)*radius;
z7 = z0 + dir(90 + 6*theta)*radius;
draw (z1 -- z2 -- z3 -- z4 -- z5 -- z6 -- z7 -- cycle) xysized(OverlayWidth,OverlayHeight) ;
\stopuseMPgraphic
\defineoverlay[hexagon][\useMPgraphic{hexagon}]
\setupbackgrounds[page][background=hexagon]
\starttext
\page[empty]
\stoptext
For more information about MetaPost graphics take a look into the MetaFun manual (http://pragma-ade.com/show-man-7.htm) which provides many examples.
Wolfgang
___________________________________________________________________________________
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prev parent reply other threads:[~2011-11-08 5:31 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-08 3:45 Syed N Haider
2011-11-08 5:31 ` Wolfgang Schuster [this message]
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