請問如何畫出虛線?
我要下面兩條是虛線:
O
/ \
口 O
(虛線) → / \←(虛線)
我是用這個方法畫圖
\draw node[circle,draw] (0) at (0,0) {\scriptsize $\alpha$};
\draw node[rectangle,draw] (1) at (-1,-1){\scriptsize };
\draw node[circle,draw] (2) at (1,-1) {\scriptsize };
\draw node(3) at (0,-2) {};
\draw node(4) at (2,-2) {};
\draw [-] (0) to (1);
\draw [-] (0) to (2);
\draw [.] (2) to (3);
\draw [.] (2) to (4);
拜託了><"