From: Alan BRASLAU <alan.braslau@cea.fr>
To: kitz@inradius.net
Cc: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: bar graphs, m-graph, sarith
Date: Sun, 7 Jul 2013 15:24:57 +0200 [thread overview]
Message-ID: <20130707152457.2f1e8978@iram-hb-003386.extra.cea.fr> (raw)
In-Reply-To: <2DD8D00C-5A6D-4FA5-92BE-B90218600983@inradius.net>
Metapost now has double precision arithmetic, so one no longer needs to
use the string arithmetic macros. However, it may be necessary to use
scantokens as in
clearxy;
z = (scantokens v1, scantokens v2);
augment.p(x,0);
augment.p(x,y);
x := x + 0.4 ;
augment.p(x,y);
augment.p(x,0);
Alan
On Sat, 6 Jul 2013 22:01:06 -0400
John Kitzmiller <kitz@inradius.net> wrote:
> When trying to make a bar graph with m-graph.mkiv and sarith, the
> command Ssub (string subtract) seems to augment.p(v1 Sadd
> "0.4",v2);Sadd instead. An mwe of a bar graph:
>
> (data1 is a separate file containing
> 01 02
> 02 03)
>
> \usemodule[m-graph]
> \startMPpage[instance=graph]
> input sarith;
> draw begingraph(5cm,5cm);
> gdata("data1", v,
> path p;
> augment.p(v1,0);
> augment.p(v1,v2)
> augment.p(v1 Sadd "0.4",v2);
> augment.p(v1 Sadd "0.4",0);
> gfill p--cycle withcolor .8white;
> gdraw p--cycle;
> );
> endgraph;
> \stopMPpage
>
> ...which gives bars of width 0.4 starting at abscissa 1 and 2 as
> expected. To increase the width of the bars to 0.8 and have them
> centered over 1 and 2, I expect to Ssub from the first two augments:
>
> \usemodule[m-graph]
> \startMPpage[instance=graph]
> input sarith;
> draw begingraph(5cm,5cm);
> gdata("data1", v,
> path p;
> augment.p(v1 Ssub "0.4",0);
> augment.p(v1 Ssub "0.4",v2);
> augment.p(v1 Sadd "0.4",v2);
> augment.p(v1 Sadd "0.4",0);
> gfill p--cycle withcolor .8white;
> gdraw p--cycle;
> );
> endgraph;
> \stopMPpage
>
> However, the Ssub adds instead and gives a line at 1.4 and 2.4.
>
> Compiling the above with mpost or mptopdf gives the desired
> result(s), but I am curious if this can be resolved so such bar
> graphs could be made within ConTeXT/METAFUN.
>
> Thanks! John
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next prev parent reply other threads:[~2013-07-07 13:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-07 2:01 John Kitzmiller
2013-07-07 13:24 ` Alan BRASLAU [this message]
2013-07-08 21:28 ` John Kitzmiller
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