lib/Mi manual de algoritmos/version_actual/src/geometria/is_inside_convex_polygon.tex

   1 % Generator: GNU source-highlight, by Lorenzo Bettini, http://www.gnu.org/software/src-highlite
   2
   3 {\ttfamily \raggedright {
   4 \noindent
   5 \mbox{}\textit{\textcolor{Brown}{/*}} \\
   6 \mbox{}\textit{\textcolor{Brown}{\ \ Returns\ true\ if\ point\ a\ is\ inside\ convex\ polygon\ p.}} \\
   7 \mbox{}\textit{\textcolor{Brown}{\ \ Note\ that\ if\ point\ a\ lies\ on\ the\ border\ of\ p\ it}} \\
   8 \mbox{}\textit{\textcolor{Brown}{\ \ is\ considered\ outside.}} \\
   9 \mbox{} \\
  10 \mbox{}\textit{\textcolor{Brown}{\ \ We\ assume\ p\ is\ convex!\ The\ result\ is\ useless\ if\ p}} \\
  11 \mbox{}\textit{\textcolor{Brown}{\ \ is\ concave.}} \\
  12 \mbox{}\textit{\textcolor{Brown}{\ */}} \\
  13 \mbox{}\textcolor{ForestGreen}{bool}\ \textbf{\textcolor{Black}{insideConvexPolygon}}\textcolor{BrickRed}{(}\textbf{\textcolor{Blue}{const}}\ vector\textcolor{BrickRed}{$<$}point\textcolor{BrickRed}{$>$}\ \textcolor{BrickRed}{\&}p\textcolor{BrickRed}{,}\ \textbf{\textcolor{Blue}{const}}\ point\ \textcolor{BrickRed}{\&}a\textcolor{BrickRed}{)}\textcolor{Red}{\{} \\
  14 \mbox{}\ \ \textcolor{ForestGreen}{int}\ mask\ \textcolor{BrickRed}{=}\ \textcolor{Purple}{0}\textcolor{BrickRed}{;} \\
  15 \mbox{}\ \ \textbf{\textcolor{Blue}{for}}\ \textcolor{BrickRed}{(}\textcolor{ForestGreen}{int}\ i\textcolor{BrickRed}{=}\textcolor{Purple}{0}\textcolor{BrickRed}{;}\ i\textcolor{BrickRed}{$<$}n\textcolor{BrickRed}{;}\ \textcolor{BrickRed}{++}i\textcolor{BrickRed}{)}\textcolor{Red}{\{} \\
  16 \mbox{}\ \ \ \ \textcolor{ForestGreen}{int}\ j\ \textcolor{BrickRed}{=}\ \textcolor{BrickRed}{(}i\textcolor{BrickRed}{+}\textcolor{Purple}{1}\textcolor{BrickRed}{)\%}n\textcolor{BrickRed}{;} \\
  17 \mbox{}\ \ \ \ \textcolor{ForestGreen}{double}\ z\ \textcolor{BrickRed}{=}\ \textbf{\textcolor{Black}{turn}}\textcolor{BrickRed}{(}p\textcolor{BrickRed}{[}i\textcolor{BrickRed}{],}\ p\textcolor{BrickRed}{[}j\textcolor{BrickRed}{],}\ a\textcolor{BrickRed}{);} \\
  18 \mbox{}\ \ \ \ \textbf{\textcolor{Blue}{if}}\ \textcolor{BrickRed}{(}z\ \textcolor{BrickRed}{$<$}\ \textcolor{Purple}{0.0}\textcolor{BrickRed}{)}\textcolor{Red}{\{} \\
  19 \mbox{}\ \ \ \ \ \ mask\ \textcolor{BrickRed}{$|$=}\ \textcolor{Purple}{1}\textcolor{BrickRed}{;} \\
  20 \mbox{}\ \ \ \ \textcolor{Red}{\}}\textbf{\textcolor{Blue}{else}}\ \textbf{\textcolor{Blue}{if}}\ \textcolor{BrickRed}{(}z\ \textcolor{BrickRed}{$>$}\ \textcolor{Purple}{0.0}\textcolor{BrickRed}{)}\textcolor{Red}{\{} \\
  21 \mbox{}\ \ \ \ \ \ mask\ \textcolor{BrickRed}{$|$=}\ \textcolor{Purple}{2}\textcolor{BrickRed}{;} \\
  22 \mbox{}\ \ \ \ \textcolor{Red}{\}}\textbf{\textcolor{Blue}{else}}\ \textbf{\textcolor{Blue}{if}}\ \textcolor{BrickRed}{(}z\ \textcolor{BrickRed}{==}\ \textcolor{Purple}{0.0}\textcolor{BrickRed}{)}\ \textbf{\textcolor{Blue}{return}}\ \textbf{\textcolor{Blue}{false}}\textcolor{BrickRed}{;} \\
  23 \mbox{}\ \ \ \ \textbf{\textcolor{Blue}{if}}\ \textcolor{BrickRed}{(}mask\ \textcolor{BrickRed}{==}\ \textcolor{Purple}{3}\textcolor{BrickRed}{)}\ \textbf{\textcolor{Blue}{return}}\ \textbf{\textcolor{Blue}{false}}\textcolor{BrickRed}{;} \\
  24 \mbox{}\ \ \textcolor{Red}{\}} \\
  25 \mbox{}\ \ \textbf{\textcolor{Blue}{return}}\ mask\ \textcolor{BrickRed}{!=}\ \textcolor{Purple}{0}\textcolor{BrickRed}{;} \\
  26 \mbox{} \\
  27 \mbox{}\textcolor{Red}{\}} \\
  28
  29 } \normalfont\normalsize