[問題] 畫虛線

[qtiv (mou)]

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><"


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推 YINGLANG:[.]改成[dashed]試試看
→ killyou:or [dotted]
→ qtiv:感謝^^