They are or not parallels?

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Författare

OSjerick

Last Updated

för 10 år sedan

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Creative Commons CC BY 4.0

Sammanfattning

The perpendicular lines that do not match row to row create an illusion of the lines between them being not parallel.

Submitted as an answer to the Showcase of Optical Illusions question on TeX SX.

Click the Illusions tag below to see more!

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TikZ Optical Illusions

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% Source: http://tex.stackexchange.com/a/149780/23931
\documentclass[tikz]{standalone}
\usetikzlibrary{calc}
\begin{document}
    \pagecolor{gray}
    \begin{tikzpicture}
        \pgfmathsetmacro{\offsety}{.05};
        \foreach \y / \offsetx in {0/0.3,1/0.5,2/0.3,3/0,4/0.3,5/0.5,6/0.3,7/0,8/0.3}
            \foreach \x in {0,...,10}{%
                \pgfmathifthenelse{mod(\x,2) == 0}{"black"}{"white"}
                %\ifodd\x \def\squarecolor{white} \else \def\squarecolor{black} \fi %Other way, use \squarecolor inside fill options
                \fill[\pgfmathresult] ($(\x,\y)+(\offsetx,\offsety*\y)$) rectangle +(1,1);
            }
    \end{tikzpicture}
\end{document}