[NTG-context] MetaPost Question

Alan BRASLAU alan.braslau at cea.fr
Sun Dec 6 22:49:27 CET 2015


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In order to draw 3D perspective diagrams in MetaPost,
you will need to transform 3D paths to a 2D projection.
There are many methods to accomplish this, and there are several MP
modules that have been written to address this issue.

One fairly simple and elegant approach is available from Urs Oswald:
http://www.ursoswald.ch/metapost/tutorial.html

Alan



On Sun, 6 Dec 2015 21:54:38 +0100
Context NTG <contextntg at gmail.com> wrote:

> I am trying to graph a cylinder. Is there a way to draw a more
> elliptic top/bottom. This one seems some flattened at the top and
> bottom. I would like to hatch the mid elliptic that is collored grey
> now. Is there a way to do this.
> 
> Thanks
> Jeroen
> 
> 
> 
> \placefigure
> 
> [here,force]
> 
> [fig:tubing]
> 
> {Tubular Linear Volumetric Capacity}
> 
> {\startMPcode
> 
> 
> draw (0,0){up} ... (1.25cm, 2mm) ... (2.5cm,0){down} ... (1.25cm,
> -2mm) ... cycle;
> 
> draw (0,0) -- (0,-5cm) dashed evenly;
> 
> draw (2.5cm,0) -- (2.5cm,-5cm) dashed evenly;
> 
> draw (0,-5cm){up} ... (1.25cm, -4.8cm) ... (2.5cm,-5cm){down} ...
> (1.25cm, -5.2cm) ... cycle dashed evenly;
> 
> 
> draw (-.2cm,0){up} ... (1.25cm, 3.5mm) ... (2.7cm,0){down} ...
> (1.25cm, -3.5mm) ... cycle;
> 
> draw (-.2cm,0) -- (-.2cm,-5cm);
> 
> draw (2.7cm,0) -- (2.7cm,-5cm);
> 
> draw (-.2cm,-5cm){up} ... (1.25cm, -4.7cm) ... (2.7cm,-5cm){down}
> dashed evenly;
> 
> draw (-.2cm,-5cm){down} ... (1.25cm, -5.3cm) ... (2.7cm,-5cm){up};
> 
> 
> fill (0,-2.5cm){up} ... (1.25cm, -2.3cm) ... (2.5cm,-2.5cm){down} ...
> (1.25cm, -2.7cm) ... cycle withcolor (.6,.6,.6) dashed evenly;
> 
> label.top("tubular",(1.26cm,-1.1cm));
> 
> label.top("inside area",(1.28cm,-1.6cm));
> 
> label.top("($in^2$)",(1.28cm,-2.2cm));
> 
> 
> draw (3.25cm,-5cm) -- (3.25cm,0);
> 
> drawarrow (3.25cm,-5) -- (3.25cm,0);
> 
> drawarrow (3.25cm,0) -- (3.25cm,-5cm);
> 
> label.top("tubular length ($in$)",(5.2cm,-2.75cm));
> 
> 
> \stopMPcode}



-- 
Alan Braslau
CEA DSM-IRAMIS-SPEC
CNRS UMR 3680
Orme des Merisiers
91191 Gif-sur-Yvette cedex FRANCE
tel: +33 1 69 08 73 15
fax: +33 1 69 08 87 86
mailto:alan.braslau at cea.fr


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