¿Cómo cambiar el tamaño y la escala de la punta de flecha en TikZ?

Question

He estado trabajando en esta figura y tengo algunos problemas.

1. ¿Cómo puedo cambiar el tamaño de las puntas de flecha?
2. ¿Cómo coloco el cero directamente debajo de la línea vertical?

3. ¿Cómo cambio la escala de la figura?

   \documentclass[a4paper,oneside,article]{memoir}
   \usepackage[utf8]{inputenc}
   \usepackage[danish]{babel}
   \usepackage{babel}
   \usepackage{pgf,tikz}
   \usepackage{tikzscale}
   \usetikzlibrary{angles,calc,intersections,quotes,arrows}
   \usepackage{tkz-euclide}
   \usetkzobj{all}
   \usepackage{mathrsfs}
   \usetikzlibrary{babel}
   \begin{document}
   
   \begin{tikzpicture}[line cap=round,line join=round,>=triangle 45,x=1.0cm,y=1.0cm]
   \draw[<->,color=black] (-1.5,0.) -- (1.5,0.);
   \foreach \x in {-1.,1.}
   \draw[shift={(\x,0)},color=black] (0pt,2pt) -- (0pt,-2pt) node[below] {\footnotesize $\x$};
   \draw[->,color=black] (0.,0) -- (0.,3.5);
   
   \draw[color=black] (0pt,-10pt) node[right] {\footnotesize $0$};
   \clip(-1.5,-1.5) rectangle (6.5,3.5);
   \draw (-1.,3.14159)-- (-1.,0.);
   \draw (-1.,0.)-- (1.,0.);
   \draw (1.,0.)-- (1.,3.14159);
   \draw (-1.,3.14159)-- (1.,3.14159);
   \draw (2.05,-0.95)-- (5.92,2.92);
   \draw (2.34,1.7)-- (4.98,0.17);
   \draw(3.5,1.5) circle (1.cm);
   \draw [<->] (3.5,1.5) -- (3.933479957929779,2.401163207234515);
   \draw [<->] (1.3,1.5) -- (2.2,1.5);
   \begin{scriptsize}
   \draw [fill=black] (0.5,0.7854) circle (1.5pt);
   \draw[color=black] (0.48297257459254965,0.96005462744924652) node {$(p_2,\alpha _2)$};
   \draw [fill=black] (-0.3,2.6179) circle (1.5pt);
   
   \draw[color=black] (-0.490091064358716,2.8276333241269166) node {$(p_1,\alpha _1)$};
   
   \draw[color=black] (-1.3379064613731417,3.14159) node {$\pi$};
   \draw[color=black] (5.8,2) node {$T(p_2,\alpha _2)$};
   \draw[color=black] (5.2,0.4451160520474517) node {$T(p_1,\alpha _1)$};
   \draw [fill=black] (3.5,1.5) circle (1.5pt);
   \draw[color=black] (3.6514466357055486,2) node {$1$};
   \draw[color=black] (2.6676305320562292,2.611406719382492) node {$b(o,1)$};
   \draw[color=black] (3.3163103462895014,1.5897712463899266) node {$o$};
   \end{scriptsize}
   \end{tikzpicture}
   \end{document}
   

Answer 1

Puede cambiar el tamaño de las puntas de flecha después de cargar la arrows.metabiblioteca más nueva usando, por ejemplo, >={Stealth[inset=0pt,length=8pt,angle'=28,round]}. Aquí puede cambiar el tipo de punta de flecha y su longitud/inserción/ángulo/redonda/etc.

Para colocar el cero directamente debajo de la línea vertical, haga \draw (0pt,-2pt) node[below] {\footnotesize $0$};, donde (0pt,-2pt)está al mismo nivel que 1y -1a su derecha e izquierda, respectivamente.

Para cambiar la escala de la figura puedes simplemente decir scale=<ratio>en lugar de x=<>y y=<>. Además, existe xscale=<>la posibilidad yscale=<>de tener escalas separadas horizontal o verticalmente.

Por último, elimine todo draw=blacky en lugar de fill=blackusar solo fill, el negro es el valor predeterminado.

\documentclass[a4paper,oneside,article]{memoir}
\usepackage[utf8]{inputenc}
\usepackage[danish]{babel}
\usepackage{babel}
\usepackage{pgf,tikz}
\usepackage{tikzscale}
\usetikzlibrary{angles,calc,intersections,quotes,arrows.meta}
\usepackage{tkz-euclide}
\usetkzobj{all}
\usepackage{mathrsfs}
\usetikzlibrary{babel}
\begin{document}

\begin{tikzpicture}[line cap=round,line join=round,>={Stealth[inset=0pt,length=8pt,angle'=28,round]},scale=1.5]
\draw[<->] (-1.5,0.) -- (1.5,0.);
\foreach \x in {-1.,1.}
\draw[shift={(\x,0)}] (0pt,2pt) -- (0pt,-2pt) node[below] {\footnotesize $\x$};
\draw[->] (0.,0) -- (0.,3.5);

\draw (0pt,-2pt) node[below] {\footnotesize $0$};
\clip (-1.5,-1.5) rectangle (6.5,3.5);
\draw (-1.,3.14159)-- (-1.,0.);
\draw (-1.,0.)-- (1.,0.);
\draw (1.,0.)-- (1.,3.14159);
\draw (-1.,3.14159)-- (1.,3.14159);
\draw (2.05,-0.95)-- (5.92,2.92);
\draw (2.34,1.7)-- (4.98,0.17);
\draw(3.5,1.5) circle (1.cm);
\draw [<->] (3.5,1.5) -- (3.933479957929779,2.401163207234515);
\draw [<->] (1.3,1.5) -- (2.2,1.5);
\begin{scriptsize}
\draw [fill] (0.5,0.7854) circle (1.5pt);
\draw (0.48297257459254965,0.96005462744924652) node {$(p_2,\alpha _2)$};
\draw [fill] (-0.3,2.6179) circle (1.5pt);

\draw (-0.490091064358716,2.8276333241269166) node {$(p_1,\alpha _1)$};

\draw (-1.3379064613731417,3.14159) node {$\pi$};
\draw (5.8,2) node {$T(p_2,\alpha _2)$};
\draw (5.2,0.4451160520474517) node {$T(p_1,\alpha _1)$};
\draw [fill] (3.5,1.5) circle (1.5pt);
\draw (3.6514466357055486,2) node {$1$};
\draw (2.6676305320562292,2.611406719382492) node {$b(o,1)$};
\draw (3.3163103462895014,1.5897712463899266) node {$o$};
\end{scriptsize}
\end{tikzpicture}
\end{document}