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双色箭头

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双色箭头

我想在图表中绘制沿轴分割的两种颜色的箭头。（这应表示以颜色编码区分的混合情况。）这是草图：双色箭头

下面是一个可供玩的 MWE：

\documentclass{article}

\usepackage{asymptote}

\begin{document}
\begin{asy}
size(10cm);
path p = (0,0)::(1,1){up}::(0,2){down};

draw (p, arrow=Arrow(size=25));
draw (shift((1,0))*p, arrow=Arrow(HookHead, size=25));
\end{asy}
\end{document}

如果箭头形式与默认箭头匹配就太好了，这样它们就可以在图表中一起使用。

我主要对渐近线解决方案感兴趣，但如果 TikZers 和 PSTricksers 有一些东西可以展示，我相信会受到赞赏。

答案1

在此处输入图片描述

首先给出一个非常基本的建议：

\begin{filecontents*}{twocoloredline.asy}
import graph;

struct DblLine{
  typedef pair T_fParam(real t);

  guide gline,midLine,leftLine,rightLine;
  arrowhead arrowHeadStyle;
  guide arhd;  // arrow head outline;
  guide leftAr, rightAr;
  pen leftPen, rightPen;

  T_fParam fmid(guide g){return new pair(real t){return point(g,t);} ;}

  T_fParam fleft(guide g,pen linepen=currentpen, real sc=linewidth(linepen)){
    return new pair(real t){
      pair m=point(g,t);
      pair p=m+rotate(90)*scale(sc)*dir(g,t);
      return p;
    };
  }

  T_fParam fright(guide g,pen linepen=currentpen, real sc=linewidth(linepen)){
    return new pair(real t){
      pair m=point(g,t);
      pair p=m+rotate(-90)*scale(sc)*dir(g,t);
      return p;
    };
  }

  void prepareHead(){
    arhd=arrowHeadStyle.head(midLine,leftPen);
    int midPointNo=ceil(size(arhd)/2);
    leftAr=subpath(arhd,0,midPointNo)--cycle;
    rightAr=subpath(arhd,midPointNo,size(arhd))--cycle;
  }  

  void prepareLine(){
    midLine=graph(fmid(gline),0.0,(real)size(gline),operator..);
    leftLine=graph(fleft(gline,leftPen),0.0,(real)size(gline),operator..);
    rightLine=graph(fright(gline,rightPen),0.0,(real)size(gline),operator..);

    if(arrowHeadStyle!=null){
      prepareHead();  
      leftLine=subpath(leftLine,0.0,intersect(leftLine,arhd)[0]);
      rightLine=subpath(rightLine,0.0,intersect(rightLine,arhd)[0]);
    }
  }

  void draw(){
    fill(midLine--reverse(leftLine)--cycle,leftPen);
    fill(rightLine--reverse(midLine)--cycle,rightPen);
    if(arrowHeadStyle!=null){
      fill(leftAr,leftPen);
      fill(rightAr,rightPen);
    }
  }

  void operator init(guide gline, arrowhead arrowHeadStyle=null,pen leftPen=red,pen rightPen=blue){
    this.gline=gline;
    this.arrowHeadStyle=arrowHeadStyle;
    this.leftPen=leftPen;
    this.rightPen=rightPen;
    prepareLine();
  }
}

////// Example of two-colored-line drawings:
//
//  import twocoloredline;
//  size(100);
//  guide g=scale(0.5)*rotate(60)*shift(-100,-50)*((0,0)::(100,100){up}::(0,200){down});
//  DblLine dblg=DblLine(shift(-20,-20)*scale(0.5)*g,blue,red);       // blue/red line
//  dblg.draw();
//  
//  DblLine(shift(-10,-5)*g, HookHead).draw();
//  
//  DblLine(shift(-100,-50)*((10,0)--(50,0)), HookHead,green+.4pt,blue).draw();
//  
//  DblLine(shift(-100,-50)*((10,0)--(0,50)), HookHead,red+0.2pt,green).draw();
//  
//  
//  DblLine((-40,-40)..(0,-40){up}..{up}(0,-10)..(-40,-10), HookHead,green,lightred+0.2pt).draw();

\end{filecontents*}
\documentclass{article}
\usepackage{asymptote}
\begin{document}

\begin{asy}
// Example of two-colored-line drawings:

import twocoloredline;
size(100);
guide g=scale(0.5)*rotate(60)*shift(-100,-50)*((0,0)::(100,100){up}::(0,200){down});
DblLine dblg=DblLine(shift(-20,-20)*scale(0.5)*g,blue,red);       // blue/red line
dblg.draw();
DblLine(shift(-10,-5)*g, HookHead).draw();
DblLine(shift(-100,-50)*((10,0)--(50,0)), HookHead,green+.4pt,blue).draw();
DblLine(shift(-100,-50)*((10,0)--(0,50)), HookHead,red+0.2pt,green).draw();
DblLine((-40,-40)..(0,-40){up}..{up}(0,-10)..(-40,-10), HookHead,green,lightred+0.2pt).draw();
\end{asy}

\end{document}

答案2

\documentclass{article}
\usepackage{xcolor}
\usepackage{verbatimbox}
\begin{document}
\shortstack{\addvbuffer[0ex -.72ex]{$\textcolor{red}{\leftharpoonup}$}\\
                \addvbuffer[-.72ex 0ex]{$\textcolor{blue}{\leftharpoondown}$}}

\shortstack{\addvbuffer[0ex -.72ex]{$\textcolor{red}{\rightharpoonup}$}\\
                \addvbuffer[-.72ex 0ex]{$\textcolor{blue}{\rightharpoondown}$}}
\end{document}

在此处输入图片描述

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