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MWE 为
\documentclass{article}
\begin{document}
\line(1,0){50}
\line(0,1){50}
\end{document}用法为
\line(x_run,y_rise){travel}详见 texdoc latex2e sec 8.19.5.
为什么要想当然呢？ 这本就是\line的语法。
\line(x-slope,y-slope){length}
The \line command draws a line of the specified length and slope.
The slope is determined by (x-slope,y-slope) which are signed integers of magnitude less than or equal to 6 and which have no common divisor except for plus or minus one; For example (1,0) is a horizontal line; (1,1) gives a slope of 45 degress; (0,1) is a vertical line; (-1,1) is 135 degrees.
The horizontal extent of the line is given by the length parameter, except in the case of a vertical line in which case length specifies the vertical height.
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x_run,y_rise太形象了
