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如何暂时移动 tikzpicture 下方的标题（更大的垂直空间）

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如何暂时移动 tikzpicture 下方的标题（更大的垂直空间）

tikzpicture我刚刚尝试使用该库绘制框图dsp。一切正常，直到我尝试为其添加标题。

问题是tikzpicture和标题之间的垂直空间太小：

标题离图片太近

这是我的源代码：

\documentclass[12pt, a4paper, bibliography=totoc, listof=totoc, 
 numbers=noendperiod, abstracton, parskip=half, headsepline
 %, plainheadsepline
]{scrreprt}
\usepackage{tikz}
\usetikzlibrary{shapes,arrows,dsp,chains,calc}
\DeclareMathAlphabet{\mathpzc}{OT1}{pzc}{m}{it}
\newcommand{\z}{\mathpzc{z}}
\begin{document}
\begin{figure}
\centering
\begin{tikzpicture}
\matrix (m1) [row sep=15mm, column sep=20mm]
{
    %------------------------------------------
    \node[dspnodeopen,dsp/label=above] (m00) {$x[n]$};    &
    \node[dspnodeopen]                 (m01) {};        &
    \node[dspnodeopen]                 (m02) {};        &
    \node[dspnodeopen]                 (m03) {};        &
    \node[dspnodeopen]                 (m04) {};        &
    \node[dspnodeopen]                 (m05) {};        \\
    %------------------------------------------
    \node[coordinate]                  (m10) {};        &
    \node[coordinate]                  (m11) {};        &
    \node[coordinate]                  (m12) {};        &
    \node[coordinate]                  (m13) {};        &
    \node[coordinate]                  (m14) {};        &
    \node[coordinate]                  (m15) {};  \\
    %------------------------------------------
    \node[coordinate]                  (m20) {};        &
    \node[coordinate]                  (m21) {};        &
    \node[coordinate]                  (m22) {};        &
    \node[coordinate]                  (m23) {};        &
    \node[coordinate]                  (m24) {};        &
    \node[coordinate]                  (m25) {};  \\
    %------------------------------------------
    \node[coordinate]                   (m30) {};        &
    \node[dspnodeopen,dsp/label=below]  (m31) {$B[0]$};  &
    \node[dspnodeopen,dsp/label=below]  (m32) {$B[1]$};  &
    \node[dspnodeopen,dsp/label=below]  (m33) {$B[2]$};  &
    \node[dspnodeopen,dsp/label=below]  (m34) {$B[3]$};  &
    \node[dspnodeopen,dsp/label=below]  (m35) {$B[128]$};  \\
};

\draw[dspflow] (m00) -- (m01);

\foreach \i [evaluate = \i as \j using int(\i+1)] in {1,2,3}
    \draw[dspflow] (m0\i) -- node[midway,above] {$\z^{-1}$} (m0\j);

\path (m04) -- node[auto=false]{\ldots} (m05);

\foreach \i [evaluate = \i as \j using int(\i-1)] in {1,2,...,4}
    \draw[dspflow] (m0\i) -- node[midway,right] {$h[\j]$} (m1\i);
\draw[dspflow] (m05) --node[midway,right] {$h[128]$} (m15);

\draw ($(m11) - (2mm,0)$) rectangle node[midway] {128-Punkt FFT} ($(m25) + (2mm,0)$);

\foreach \i [evaluate = \i as \j using int(\i-1)] in {1,2,...,4}
    \draw[dspflow] (m2\i) --  (m3\i);
\draw[dspflow] (m25) -- (m35);

\end{tikzpicture}

\caption{Blockschaltbild einer 128-Punkt FFT-Filterbank}
\label{fig:fft128}
\end{figure}
\end{document}

答案1

快速修复：\medskip在\end{tikzpicture}和之间添加\caption。

原因是B[N]标签似乎不被视为边界框tikzpicture。您可以（作为替代\medskip）手动修改边界框，方法是添加

\useasboundingbox (current bounding box.north west) rectangle ([yshift=-2ex]current bounding box.south east);

就在之前\end{tikzpicture}。

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