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1+\documentclass[convert={density=300,size=1080x800,outext=.png}]{standalone}
2+\usepackage{tikz}
3+\usetikzlibrary{decorations.pathreplacing}
4+\begin{document}
5+6+%.. tikz::
7+\begin{tikzpicture}
8+[scale=5, every node/.style={color=black}, decoration={brace,amplitude=7pt}] \coordinate (a0) at (0, 0.0);
9+\coordinate (a1) at (1, 0.0);
10+\coordinate (a2) at (2, 0.0);
11+\coordinate (a3) at (3, 0.0);
12+\coordinate (s0) at (0, 0.1);
13+\coordinate (s1) at (1, 0.1);
14+\coordinate (s2) at (2, 0.1);
15+\coordinate (s3) at (3, 0.1);
16+% axis
17+\draw[thick] (0, 0) -- (3, 0) node[below] {};
18+%curly bracket
19+\draw [decorate, very thick] (s0) -- (s1)
20+ node [midway, anchor=south, outer sep=10pt]{accept $f_0$};
21+\draw [decorate, very thick] (s1) -- (s2)
22+ node [midway, anchor=south, outer sep=10pt]{draw again};
23+\draw [decorate, very thick] (s2) -- (s3)
24+ node [midway, anchor=south, outer sep=10pt]{accept $f_1$};
25+\node[circle, draw, thin, blue, fill=white!10, scale=0.45] at (a0){};
26+\node[below, outer sep=5pt] at (a0){$0$};
27+\node[circle, draw, thin, blue, fill=white!10, scale=0.45] at (a1){};
28+\node[below, outer sep=5pt] at (a1){$B$};
29+\node[circle, draw, thin, blue, fill=white!10, scale=0.45] at (a2){};
30+\node[below, outer sep=5pt] at (a2){$A$};
31+\node[circle, draw, thin, blue, fill=white!10, scale=0.45] at (a3){};
32+\node[below, outer sep=5pt] at (a3){$1$};
33+\node[below, outer sep=25pt] at (1.5, 0){values of $\pi$};
34+\end{tikzpicture}
35+36+\end{document}