When trying to make a bar graph with m-graph.mkiv and sarith, the command Ssub
(string subtract) seems to 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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