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Essentially, LaTeX 0133 inserts into the line a rectangle having zero width, 0134 <code>\rule[-0.3\baselineskip]{0pt}{\baselineskip}</code> (see <a href="_005crule.html#g_t_005crule">\rule</a>). 0135 The <code>\baselineskip</code> changes with the current font and fontsize. 0136 </p> 0137 <p>In this example the <code>\strut</code> keeps the box inside the frame from 0138 having zero height. 0139 </p> 0140 <div class="example"> 0141 <pre class="example">\setlength{\fboxsep}{0pt}\framebox[2in]{\strut} 0142 </pre></div> 0143 0144 <p>This example has four lists. In the first there is a much bigger gap 0145 between items 2 and 3 than there is between items 1 and 2. 0146 The second list fixes that with a <code>\strut</code> at the end of its first 0147 item’s second line. 0148 </p> 0149 <div class="example"> 0150 <pre class="example">\setlength{\fboxsep}{0pt} 0151 \noindent\begin{minipage}[t]{0.2\linewidth} 0152 \begin{enumerate} 0153 \item \parbox[t]{15pt}{test \\ test} 0154 \item test 0155 \item test 0156 \end{enumerate} 0157 \end{minipage}% 0158 \begin{minipage}[t]{0.2\linewidth} 0159 \begin{enumerate} 0160 \item \parbox[t]{15pt}{test \\ test\strut} 0161 \item test 0162 \item test 0163 \end{enumerate} 0164 \end{minipage}% 0165 \begin{minipage}[t]{0.2\linewidth} 0166 \begin{enumerate} 0167 \item \fbox{\parbox[t]{15pt}{test \\ test}} 0168 \item \fbox{test} 0169 \item \fbox{test} 0170 \end{enumerate} 0171 \end{minipage}% 0172 \begin{minipage}[t]{0.2\linewidth} 0173 \begin{enumerate} 0174 \item \fbox{\parbox[t]{15pt}{test \\ test\strut}} 0175 \item \fbox{test} 0176 \item \fbox{test} 0177 \end{enumerate} 0178 \end{minipage}% 0179 </pre></div> 0180 0181 <p>The final two lists use <code>\fbox</code> to show what’s happening. The 0182 third list’s <code>\parbox</code> goes only to the bottom of its second 0183 ‘<samp>test</samp>’, which happens not have any characters that descend below 0184 the baseline. The fourth list adds the strut that gives the needed 0185 extra below-baseline space. 0186 </p> 0187 <a name="index-package_002c-TikZ-1"></a> 0188 <a name="index-TikZ-package-1"></a> 0189 <a name="index-package_002c-Asymptote-1"></a> 0190 <a name="index-Asymptote-package-1"></a> 0191 0192 <p>The <code>\strut</code> command is often useful in graphics, such as in 0193 <samp>TikZ</samp> or <samp>Asymptote</samp>. For instance, you may have a command 0194 such as <code>\graphnode{<var>node-name</var>}</code> that fits a circle around 0195 <var>node-name</var>. However, unless you are careful the <var>node-name</var>’s 0196 ‘<samp>x</samp>’ and ‘<samp>y</samp>’ will produce different-diameter circles because 0197 the characters are different sizes. A careful <code>\graphnode</code> might 0198 insert a <code>\strut</code>, then <var>node-name</var>, and then draw the circle. 0199 </p> 0200 <p>The general approach of using a zero width <code>\rule</code> is useful in 0201 many circumstances. In this table, the zero-width rule keeps the top of 0202 the first integral from hitting the <code>\hline</code>. Similarly, the 0203 second rule keeps the second integral from hitting the first. 0204 </p> 0205 <div class="example"> 0206 <pre class="example">\begin{tabular}{rl} 0207 \textsc{Integral} &\textsc{Value} \\ 0208 \hline 0209 $\int_0^x t\, dt$ &$x^2/2$ \rule{0em}{2.5ex} \\ 0210 $\int_0^x t^2\, dt$ &$x^3/3$ \rule{0em}{2.5ex} 0211 \end{tabular} 0212 </pre></div> 0213 0214 <p>(Although the line-ending double backslash command has an available 0215 optional argument to put in more vertical room, that won’t work here. 0216 Changing the first double backslash to something like <code>\\[2.5ex]</code> 0217 will put the room between the header line and the <code>\hline</code>, and the 0218 integral would still hit the line.) 0219 </p> 0220 0221 0222 0223 <hr/><div class='referenceinfo'> <a href='https://latexref.xyz/'> <i>Unofficial LaTeX2e reference manual</i></a></div> 0224 </body> 0225 </html>