0

I would like to document a function from OpenCV. I used the lstlisting environment from listings package.

\documentclass[12pt]{article}
\usepackage{listings}

\begin{document}

\begin{lstlisting}
double cv::calibrateCamera 
(   
    InputArrayOfArrays  objectPoints,
    InputArrayOfArrays  imagePoints,
    Size                imageSize,
    InputOutputArray    cameraMatrix,
    InputOutputArray    distCoeffs,
    OutputArrayOfArrays rvecs,
    OutputArrayOfArrays tvecs,
    int                 flags,
    TermCriteria        criteria
)   
\end{lstlisting}

\end{document}

The above code was formatted using tabs, as can be seen in the following screenshot that shows them as grey arrows:

enter image description here

As can be seen, the parameter names (that's the second "column": objectPoints, imagePoints, etc.) all line up nicely.

In the result however, additional white space is introduced:

result

How can I fix this so that the code is rendered verbatim?

1

As posted the code produces

enter image description here

I would guess your original source has tabs not spaces (this site replaces tabs by spaces)

  • The problem was indeed related to tabs. I added an answer. However, given that the MWE is rather useless, given that it doesn't reproduce the problem as you point out, should I delete my question? Or should I edit my question to state that tabs were used for the formatting? – null Oct 25 '16 at 16:34
  • no I'd leave it helps other people with same issue (It's possibly a duplicate though I'll look...) – David Carlisle Oct 25 '16 at 16:40
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Well, PEBCAC.

If the text should be rendered verbatim, then it must be ensured that tabs are rendered equally.

As it turns out, listings has a few settings, which can be set with this command:

\lstset{
    tabsize=4
}

The default value for tabsize is 8 and in my text editor, the size was 4. With the above setting of 4, the code renders just fine.

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