Curiouslearn wrote:
Hi,
Is it possible to truncate the digits after decimal point in Metapost
when using textext()? Please see the minimal example below which
produces 1.84375. Can I just keep the first digit and have it produce
1.8 ?
Here is a helper macro for you:
def trunc_digits(expr n, origs) =
hide(
string s, tmp;
numeric ii, e;
e := -1;
for i=1 upto length(origs):
ii := i;
tmp := substring (i-1,i) of origs;
if tmp = ".": if n=0: ii:=ii-1; exitif true; fi e:=0; fi
if e>=0: e := e+1; exitif e>n; fi
endfor;
s:=substring(0,ii) of origs; )
s
enddef;
When run this macro with the result of decimal() as second argument,
it will create a new string as many fractional digits as you specify
in the first argument:
label.lft(textext(trunc_digits(1,decimal f(5))),(0,f(5)) scaled u);
Best wishes,
Taco
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