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Given an arbitrary point, let's say p, that may or may not be obtained by several indirect processes such as penpos or by intersections, how do I get to display the coordinates "(px,py)" of the point in the pdf generated ? when I don't have those coordinates to beguin with ? I remember having done this once already, but I forgot how to do it.

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  • Try z1 = p; Then x1 and y1 will hold the values you are looking for. You can use a label to display them in the PDF. – TeXnician Sep 14 '19 at 20:55
  • That doesn't do it for me, I really need the value of the coordinates of the point, not just to use the point. – Felipe Dilho Sep 15 '19 at 2:42
  • That doesn't seem to work in my code: – Felipe Dilho Sep 15 '19 at 3:08
  • z23=(-1.272cm,-3.053cm); z24=(-1.12cm,-2.148cm); z25=(-1.2405cm,-1.6084cm); z3=(-1.072cm,0cm); z27=(-1.011cm,0.468cm); z26=(-1.296cm,-0.331cm); penpos23(0.25cm,70.2567+90); penpos24(0.7cm,-87.3949-90); penpos25(0.8cm,-66.3078-90); penpos26(1.07cm,77.13501+90); penpos3(1.24cm,21.801); penpos27(1.1294cm,64.09569+78); z111=(precontrol 5 of (z23l..z24l..z25l..z3r--z27..z26..z25..z24..z23--cycle)); label.bot(TEX decimal(x111) ,(10,20)); – Felipe Dilho Sep 15 '19 at 3:08
  • In the log it says that there is a `,' missing. – Felipe Dilho Sep 15 '19 at 3:09
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Given a pair p, the two values are available as xpart p and ypart p.

To make a string representation of the pair try:

"(" & decimal xpart p & "," & decimal ypart p & ")"

You can then type set that string as usual with infont or the TEX() macro.

 label.bot(TEX("$(" & decimal xpart p & "," & decimal ypart p & ")$"), (10, 20));

This is rather less cumbersome if you use the built-in plain shorthand notation for pairs. So given a pair variable z1, the two values are available as x1 and y1. And you can make a string representation as 

 "(" & decimal x1 & "," & decimal y1 & ")"
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