tikz 中箭头的圆角

Question

我有一个如下所示的箭头：

    \documentclass[tikz]{standalone}        
    \usetikzlibrary{shapes, arrows.meta, positioning}
    \tikzset{every picture/.style={/utils/exec={\sffamily\normalsize}}}
    
    \tikzstyle{textbox} = [rectangle, minimum width = 3.2cm, minimum height = 1cm, rounded corners = 1pt, line width = 1pt, draw = black, align = center]
    \tikzstyle{arrow}   = [solid, line width = 9pt, -{Triangle[width = 18pt, length = 12pt]}, color = black, shorten >= 3pt, shorten <= 3pt]
    
    \begin{document}
        \begin{tikzpicture}[node distance = 2cm and 1cm, outer sep = 0, inner sep = 0]
                
            \node [textbox]                  (box1) {box1};
            \node [textbox, right = of box1] (box2) {box2};
            \draw [arrow] (box1) -- (box2);
            
        \end{tikzpicture}
    \end{document}

我的目标是将箭头的所有角都圆化 1pt，就像我对文本框所做的那样。我已经尝试过线帽和圆角，但没有效果。我怎样才能将箭头的所有角和线帽都圆化 1pt？

Answer 1

  \documentclass[tikz]{standalone}        
    \usetikzlibrary{shapes, arrows.meta, positioning}
    \tikzset{every picture/.style={/utils/exec={\sffamily\normalsize}}}
    
    \tikzstyle{textbox} = [rectangle, minimum width = 3.2cm, minimum height = 1cm, rounded corners = 1pt, line width = 1pt, draw = black, align = center]
    \tikzstyle{arrow}   = [solid, line width = 9pt, -{Triangle[width = 18pt, length = 12pt, round, line width=1pt]}, color = black, shorten >= 3pt, shorten <= 3pt]
    
    \begin{document}
        \begin{tikzpicture}[node distance = 2cm and 1cm, outer sep = 0, inner sep = 0]
                
            \node [textbox]                  (box1) {box1};
            \node [textbox, right = of box1] (box2) {box2};
            \draw [arrow] (box1) -- (box2);
            
        \end{tikzpicture}
    \end{document}

为了使左端变圆，你可以Square像这样在末端添加一个圆形：

\documentclass[tikz]{standalone}        
    \usetikzlibrary{shapes, arrows.meta, positioning}
    \tikzset{every picture/.style={/utils/exec={\sffamily\normalsize}}}
    
    \tikzstyle{textbox} = [rectangle, minimum width = 3.2cm, minimum height = 1cm, rounded corners = 1pt, line width = 1pt, draw = black, align = center]
    \tikzstyle{arrow}   = [solid, line width = 9pt, {Square[round, line width=1pt, length= 2pt, width=9pt]}-{Triangle[width = 18pt, length = 12pt, round, line width=1pt]}, color = black, shorten >= 3pt, shorten <= 3pt]
    
    \begin{document}
        \begin{tikzpicture}[node distance = 2cm and 1cm, outer sep = 0, inner sep = 0]
                
            \node [textbox]                  (box1) {box1};
            \node [textbox, right = of box1] (box2) {box2};
            \draw [arrow] (box1) -- (box2);
            
        \end{tikzpicture}
    \end{document}    

另一种方法是根本不使用箭头，而是使用single arrow节点形状。

编辑：

使用single arrow节点也会使内角变圆，但是当然它不会像正常的绘制箭头那样延伸：

\documentclass[tikz]{standalone}        
    \usetikzlibrary{shapes, arrows.meta, positioning, shapes.arrows}
    \tikzset{every picture/.style={/utils/exec={\sffamily\normalsize}}}
    \tikzstyle{textbox} = [rectangle, minimum width = 3.2cm, minimum height = 1cm, rounded corners = 1pt, line width = 1pt, draw = black, align = center]    
    \begin{document}
        \begin{tikzpicture}[node distance = 2cm and 1cm, outer sep = 0, inner sep = 0]            
            \node [textbox]                  (box1) {box1};
            \node [textbox, right = of box1] (box2) {box2};
            \path (box1) -- (box2) node[midway, xshift= -2pt, draw, single arrow, minimum height=0.8cm, minimum width=0.7cm, single arrow head extend=0.01cm, single arrow tip angle=75,rounded corners=1pt, fill]{};
        \end{tikzpicture}
    \end{document}