Measure/dimension line (line parallel to a line)

Question

I have a problem drawing a slanted "measure line" parallel to a line.

documentclass[border=2pt,tikz]{standalone}
usetikzlibrary{calc}
begin{document}

begin{center}
begin{tikzpicture}
coordinate (A) at (1,1);
coordinate (B) at (4,4);
fill (A) circle(.5mm);
fill (B) circle(.5mm);
draw (A)--(B);
coordinate (P1) at ($($(A)!1!(B)$)!.2cm!90:(B)$);
coordinate (P2) at ($($(A)!0!(B)$)!.2cm!90:(B)$);
draw[|<->|] (P1)--(P2);
end{tikzpicture}
end{center}

end{document}

Notice that the line ends incorrectly using "1" and changing 1 to "0.9999" in (A)!1!(B) makes it better. I guess there is a better way to do this. TIA.

user231225 · Accepted Answer

You can just use (A) and (B). Then the segment is long enough to get a good result.
documentclass[border=2pt,tikz]{standalone}
usetikzlibrary{calc}
begin{document}

begin{tikzpicture}
coordinate (A) at (1,1);
coordinate (B) at (4,4);
fill (A) circle(.5mm);
fill (B) circle(.5mm);
draw (A)--(B);
coordinate (P1) at ($(A)!.2cm!90:(B)$);
coordinate (P2) at ($(B)!.2cm!-90:(A)$);
draw[|<->|] (P1)--(P2);
end{tikzpicture}
end{document}

hpekristiansen · Answer

You can also use a dimline like this:
documentclass[tikz, border=2pt]{standalone}
usepackage{tikz-dimline, calc}
begin{document}
begin{tikzpicture}
coordinate (A) at (1,1);
coordinate (B) at (4,4);
fill (A) circle(.5mm);
fill (B) circle(.5mm);
draw (A)--(B);
dimline[extension start length=0.4 cm, extension end length=0.4 cm] {($(A)!.4cm!90:(B)$)} {($(B)!.4cm!-90:(A)$)}{10};
end{tikzpicture}
end{document}

Or without a label:
dimline[extension start length=0.4 cm, extension end length=0.4 cm, label style=transparent] {($(A)!.4cm!90:(B)$)} {($(B)!.4cm!-90:(A)$)}{};

Concept7 · Answer

You can also use the - in my opinion - amazing package tkz-euclide and do something like:
documentclass[border=2mm, tikz]{standalone}

usepackage{tkz-euclide}

begin{document}

begin{tikzpicture}
        tkzDefPoints{
        1/1/A,
        4/4/B}
        tkzDrawSegment[dim={,4mm,transparent}](A,B)
        tkzDrawPoints(A,B)
    end{tikzpicture}

end{document}

Black Mild · Answer

Also you can use the [turn] option.

documentclass[border=5mm,tikz]{standalone}
begin{document}
begin{tikzpicture}
path 
(0,0) coordinate (A) node[below]{$A$} 
(4,3) coordinate (B) node[right]{$B$}
(A)--(B)--([turn]90:2mm)  coordinate (Bt)
(B)--(A)--([turn]-90:2mm) coordinate (At);
draw[red] (A)--(B);
draw[|<->|,gray,very thin] (At)--(Bt) node[midway,above,sloped,scale=.8,black]{$5$ cm};
fill (A) circle(1pt) (B) circle(1pt);
end{tikzpicture}
end{document}

Measure/dimension line (line parallel to a line)

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