floats.sty

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{polytech/floats}[\polytechfiledate\space\polytechfileversion\space Polytech document class sub package]

%###

% set caption below
\floatstyle{plain}
\restylefloat{figure}

% set caption above
\floatstyle{plaintop}
\restylefloat{table}

% définit le format des légendes
\DeclareCaptionLabelFormat{polytech}{#1~#2}

% general caption setup
\captionsetup{%
  labelformat=polytech,
  format=hang,
  labelfont=bf,
  font=small,
  justification=centering,
  font={small},
  textfont=it,
  labelfont={bf},
  margin=1cm,
  figurename=Figure,
  tablename=Table,
  skip=5pt plus 1pt minus 1pt,
  singlelinecheck=false,
  figurewithin=chapter,
  tablewithin=chapter,
  subrefformat=subsimple
}

% we remove the margin in subfloat
\captionsetup[subfloat]{%
  margin=0cm,
  labelformat=parens,
  subrefformat=subsimple
}

% we add parenthesis for subfigure number
%\renewcommand\thesubfigure{(\alph{subfigure}):}

\renewcommand\thefigure{\arabic{figure}}
\renewcommand\thetable{\arabic{table}}

% save current definition
\let\polytech@oldfigure\figure
\let\polytech@endoldfigure\endfigure
\let\polytech@oldtable\table
\let\polytech@endoldtable\endtable
\let\polytech@oldsubfloat\subfloat

\let\polytech@oldalgorithm\algorithm
\let\polytech@oldendalgorithm\endalgorithm

% we override subfloat to disable label storage
\RenewDocumentCommand{\subfloat}{oom}{%
  \global\boolfalse{polytech@ref@savelabel}% disable save label
  \IfValueTF{#1}{%
    \IfValueTF{#2}{%
      \polytech@oldsubfloat[#1][#2]{#3}%
    }{%
      \polytech@oldsubfloat[#1]{#3}%
    }%
  }{%
    \polytech@oldsubfloat{#3}%
  }%
  \global\booltrue{polytech@ref@savelabel}% enable save label
}

% we redefine the figure environment
\RenewDocumentEnvironment{figure}{o}{%
  % #1 if ignored since we impose it
  \polytech@oldfigure[H]%
  % prepare caption saving
  \global\csletcs{polytech@oldcaption}{caption}%
  \csundef{polytech@figure@caption}%
  \csundef{polytech@figure@captionalt}%
  \RenewDocumentCommand{\caption}{om}{%
    \IfValueTF{##1}{% we save the short caption
      \csdef{polytech@figure@captionalt}{##1}%
    }{}%
    \csdef{polytech@figure@caption}{##2}%
  }%
  % we need the label later
  \global\booltrue{polytech@ref@savelabel}%
  \csundef{polytech@ref@savedlabel}{}%
  % we center things
  \centering%
}{%
  % we restore caption
  \csletcs{caption}{polytech@oldcaption}%
  % we set the caption
  \ifcsdef{polytech@figure@captionalt}{%
    \caption[\csuse{polytech@figure@captionalt}]{\csuse{polytech@figure@caption}}%
  }{%
    \ifcsdef{polytech@figure@caption}{%
      \caption{\csuse{polytech@figure@caption}}%
    }{%
      \polytechwarning{Missing caption on figure}%
    }%
  }%
  \ifcsdef{polytech@ref@savedlabel}{%
    \label{\csuse{polytech@ref@savedlabel}}%
  }{%
    \polytechwarning{Missing label on figure}%
  }%
  % restore normal \label behavior 
  \global\boolfalse{polytech@ref@savelabel}%
  \polytech@endoldfigure%
}


% we redefine the figure environment
\RenewDocumentEnvironment{table}{o}{%
  % #1 if ignored since we impose it
  \polytech@oldtable[H]%
  % prepare caption saving
  \global\csletcs{polytech@oldcaption}{caption}%
  \csundef{polytech@figure@caption}%
  \csundef{polytech@figure@captionalt}%
  \RenewDocumentCommand{\caption}{om}{%
    \IfValueTF{##1}{% we save the short caption
      \csdef{polytech@figure@captionalt}{##1}%
    }{}%
    \csdef{polytech@figure@caption}{##2}%
  }%
  % we need the label later
  \global\booltrue{polytech@ref@savelabel}%
  \csundef{polytech@ref@savedlabel}{}%
  % we center things
  \centering%
}{%
  % we restore caption
  \csletcs{caption}{polytech@oldcaption}%
  % we set the caption
  \ifcsdef{polytech@figure@captionalt}{%
    \caption[\csuse{polytech@figure@captionalt}]{\csuse{polytech@figure@caption}}%
  }{%
    \ifcsdef{polytech@figure@caption}{%
      \caption{\csuse{polytech@figure@caption}}%
    }{%
      \polytechwarning{Missing caption on table}%
    }%
  }%
  \ifcsdef{polytech@ref@savedlabel}{%
    \label{\csuse{polytech@ref@savedlabel}}%
  }{%
    \polytechwarning{Missing label on table}%
  }%
  % restore normal \label behavior 
  \global\boolfalse{polytech@ref@savelabel}%
  \polytech@endoldtable%
}

\ifcsdef{algorithm}{
  % we redefine the figure environment
  \RenewDocumentEnvironment{algorithm}{o}{%
    \polytech@oldalgorithm[H]%
    % prepare caption saving
    \global\csletcs{polytech@oldcaption}{caption}%
    \csundef{polytech@figure@caption}%
    \csundef{polytech@figure@captionalt}%
    \RenewDocumentCommand{\caption}{om}{%
      \IfValueTF{##1}{% we save the short caption
        \csdef{polytech@figure@captionalt}{##1}%
      }{}%
      \csdef{polytech@figure@caption}{##2}%
    }%
    % we need the label later
    \global\booltrue{polytech@ref@savelabel}%
    \csundef{polytech@ref@savedlabel}{}%
  }{
     % we restore caption
    \csletcs{caption}{polytech@oldcaption}%
    % we set the caption
    \ifcsdef{polytech@figure@captionalt}{%
      \caption[\csuse{polytech@figure@captionalt}]{\csuse{polytech@figure@caption}}%
    }{%
      \ifcsdef{polytech@figure@caption}{%
        \caption{\csuse{polytech@figure@caption}}%
      }{%
        \polytechwarning{Missing caption on algorithm}%
      }%
    }%
    \ifcsdef{polytech@ref@savedlabel}{%
      \label{\csuse{polytech@ref@savedlabel}}%
    }{%
      \polytechwarning{Missing label on algorithm}%
    }%
    % restore normal \label behavior 
    \global\boolfalse{polytech@ref@savelabel}%
    \polytech@oldendalgorithm%
  }
}{}

\renewcommand\floatpagefraction{.9}
\renewcommand\topfraction{.9}
\renewcommand\bottomfraction{.9}
\renewcommand\textfraction{.1}
\setcounter{totalnumber}{50}
\setcounter{topnumber}{50}
\setcounter{bottomnumber}{50}

 \patchcmd{\sf@@sub@label}
  {\sf@oldlabel{#1}}
  {%
    \sf@oldlabel{#1}%
    \zref@setcurrent{issubfloat}{1}%
    \polytech@zlabel{sub@#1}%    
  }
  {}
  {
    \polytechfatalerror{Can not patch \string\sf@@sub@label.}
  }