pgf/tikz：如何計算x座標之間的一半距離？

我想創建一個新的節點類型是這樣的：pgf/tikz：如何計算x座標之間的一半距離？

，但不明白，如何計算X3 = X1 +（X2 - X1）/ 2

在這裏，我試過做到這一點，但徒勞無益。

\pgfdeclareshape{variant}{ \inheritsavedanchors[from=rectangle] 
    % this is nearly a rectangle 
    \inheritanchorborder[from=rectangle] \inheritanchor[from=rectangle]{center} 
    \inheritanchor[from=rectangle]{north} \inheritanchor[from=rectangle]{south} 
    \inheritanchor[from=rectangle]{west} \inheritanchor[from=rectangle]{east} 

    \backgroundpath{ 
     %{{{ store lower left in xa/ya and upper right in xb/yb 
     \southwest \[email protected]=\[email protected] \[email protected]=\[email protected] 
     \northeast \[email protected]=\[email protected] \[email protected]=\[email protected] 
    %}}} 

     % compute x3 --- here is the problem! 
     \[email protected] = \[email protected] - \[email protected] 
     \[email protected] = 0.5\[email protected] 
     \[email protected] = \[email protected] 
     \advance \[email protected] by \[email protected] 

    %end of the problem 

     \[email protected] = \[email protected] 
     \advance\[email protected] by - 10pt % this should be a parameter 

     \southwest \[email protected]=\[email protected] \[email protected]=\[email protected] 
     %{{{ construct 2 bottom lines 
     \pgfpathmoveto{\pgfpoint{\[email protected]}{\[email protected]}} 
     \pgfpathlineto{\pgfpoint{\[email protected]}{\[email protected]}} 
     \pgfpathlineto{\pgfpoint{\[email protected]}{\[email protected]}} 
    %}}} 

     % Rectangle box 
     \pgfpathrectanglecorners{\southwest}{\northeast} 

    } 
    }

來源

2011-06-08 user4035

您可以使用PGF數學引擎來進行計算。

% compute x3 --- here is the problem! 

\pgfmathparse{(\[email protected]\[email protected])/2} 
\[email protected]=\[email protected] 
\advance\[email protected] by \pgfmathresult pt 

%end of the problem

來源

2011-06-16 02:37:12

當我使用它，我有一個「警告：在向後兼容模式下運行（不適合刻度標記;缺少的功能）考慮編寫\ pgfplotsset {COMPAT = 1.8}到你的序言」。如果我這樣做，我還有一個問題：「不完整\ iffalse;所有文本被忽略......」 – Antonin 2014-04-09 20:02:32

pgf/tikz：如何計算x座標之間的一半距離？

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