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%D \module
%D   [       file=mp-page.mpiv,
%D        version=1999.03.10,
%D          title=\CONTEXT\ \METAPOST\ graphics,
%D       subtitle=page enhancements,
%D         author=Hans Hagen,
%D           date=\currentdate,
%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.

%D This module is rather preliminary and subjected to changes.In the process of
%D moving to \METAFUN2\ this might change.

if known context_page : endinput ; fi ;

boolean context_page ; context_page := true ;

def LoadPageState = enddef ; % just in case some old style uses it

% Next we implement the the page area model. First some constants.

LeftEdge             :=  -4 ; Top             := -40 ;
LeftEdgeSeparator    :=  -3 ; TopSeparator    := -30 ;
LeftMargin           :=  -2 ; Header          := -20 ;
LeftMarginSeparator  :=  -1 ; HeaderSeparator := -10 ;
Text                 :=   0 ; Text            :=   0 ;
RightMarginSeparator :=  +1 ; FooterSeparator := +10 ;
RightMargin          :=  +2 ; Footer          := +20 ;
RightEdgeSeparator   :=  +3 ; BottomSeparator := +30 ;
RightEdge            :=  +4 ; Bottom          := +40 ;

numeric HorPos ; HorPos := 0 ;
numeric VerPos ; VerPos := 0 ;

% Because metapost > 1.50 has dynamic memory management and is less efficient than
% before we now delay calculations ... (on a document with 150 pages the time spent
% in mp was close to 5 seconds which was only due to initialising the page related
% areas, something that was hardly noticeable before. At least now we're back to
% half a second for such a case.

def SetPageVsize =
    numeric Vsize[] ;
    Vsize[Top]             = TopHeight ;
    Vsize[TopSeparator]    = TopDistance ;
    Vsize[Header]          = HeaderHeight ;
    Vsize[HeaderSeparator] = HeaderDistance ;
    Vsize[Text]            = TextHeight ;
    Vsize[FooterSeparator] = FooterDistance ;
    Vsize[Footer]          = FooterHeight ;
    Vsize[BottomSeparator] = BottomDistance ;
    Vsize[Bottom]          = BottomHeight ;
enddef ;

def SetPageHsize =
    numeric Hsize[] ;
    Hsize[LeftEdge]             = LeftEdgeWidth ;
    Hsize[LeftEdgeSeparator]    = LeftEdgeDistance ;
    Hsize[LeftMargin]           = LeftMarginWidth ;
    Hsize[LeftMarginSeparator]  = LeftMarginDistance ;
    Hsize[Text]                 = MakeupWidth ;
    Hsize[RightMarginSeparator] = RightMarginDistance ;
    Hsize[RightMargin]          = RightMarginWidth ;
    Hsize[RightEdgeSeparator]   = RightEdgeDistance ;
    Hsize[RightEdge]            = RightEdgeWidth ;
enddef ;

def SetPageVstep =
    numeric Vstep[] ;
    Vstep[Top]             = Vstep[TopSeparator]   +Vsize[TopSeparator] ;
    Vstep[TopSeparator]    = PaperHeight-TopSpace ;
    Vstep[Header]          = Vstep[TopSeparator]   -Vsize[Header] ;
    Vstep[HeaderSeparator] = Vstep[Header]         -Vsize[HeaderSeparator] ;
    Vstep[Text]            = Vstep[HeaderSeparator]-Vsize[Text] ;
    Vstep[FooterSeparator] = Vstep[Text]           -Vsize[FooterSeparator] ;
    Vstep[Footer]          = Vstep[FooterSeparator]-Vsize[Footer] ;
    Vstep[BottomSeparator] = Vstep[Footer]         -Vsize[BottomSeparator] ;
    Vstep[Bottom]          = Vstep[BottomSeparator]-Vsize[Bottom] ;
enddef ;

def SetPageHstep =
    numeric Hstep[] ;
    Hstep[LeftEdge]             = Hstep[LeftEdgeSeparator]   -Hsize[LeftEdge] ;
    Hstep[LeftEdgeSeparator]    = Hstep[LeftMargin]          -Hsize[LeftEdgeSeparator] ;
    Hstep[LeftMargin]           = Hstep[LeftMarginSeparator] -Hsize[LeftMargin] ;
    Hstep[LeftMarginSeparator]  = Hstep[Text]                -Hsize[LeftMarginSeparator] ;
    Hstep[Text]                 = BackSpace ;
    Hstep[RightMarginSeparator] = Hstep[Text]                +Hsize[Text] ;
    Hstep[RightMargin]          = Hstep[RightMarginSeparator]+Hsize[RightMarginSeparator] ;
    Hstep[RightEdgeSeparator]   = Hstep[RightMargin]         +Hsize[RightMargin] ;
    Hstep[RightEdge]            = Hstep[RightEdgeSeparator]  +Hsize[RightEdgeSeparator] ;
enddef ;

def SetPageArea =
    path Area[][] ;
    for VerPos=Top step 10 until Bottom:
        for HorPos=LeftEdge step 1 until RightEdge:
            Area[HorPos][VerPos] := unitsquare xscaled Hsize[HorPos] yscaled Vsize[VerPos] ;
            Area[VerPos][HorPos] := Area[HorPos][VerPos] ;
        endfor ;
    endfor ;
enddef ;

def SetPageLocation =
    pair Location[][] ;
    for VerPos=Top step 10 until Bottom:
        for HorPos=LeftEdge step 1 until RightEdge:
            Location[HorPos][VerPos] := (Hstep[HorPos],Vstep[VerPos]) ;
            Location[VerPos][HorPos] := Location[HorPos][VerPos] ;
        endfor ;
    endfor ;
enddef ;

def SetPageField =
    path Field[][] ;
    for VerPos=Top step 10 until Bottom:
        for HorPos=LeftEdge step 1 until RightEdge:
            Field[HorPos][VerPos] := unitsquare xscaled Hsize[HorPos] yscaled Vsize[VerPos] shifted (Hstep[HorPos],Vstep[VerPos]) ;
            Field[VerPos][HorPos] := Field[HorPos][VerPos] ;
        endfor ;
    endfor ;
enddef ;

def Area     = hide(SetPageArea     ;) Area     enddef ;
def Location = hide(SetPageLocation ;) Location enddef ;
def Field    = hide(SetPageField    ;) Field    enddef ;
def Vsize    = hide(SetPageVsize    ;) Vsize    enddef ;
def Hsize    = hide(SetPageHsize    ;) Hsize    enddef ;
def Vstep    = hide(SetPageVstep    ;) Vstep    enddef ;
def Hstep    = hide(SetPageHstep    ;) Hstep    enddef ;

vardef FrontPageWidth  = PaperWidth enddef ;
vardef BackPageWidth   = PaperWidth enddef ;
vardef CoverWidth      = 2 * PaperWidth + SpineWidth enddef ;
vardef CoverHeight     = PaperHeight enddef ;

vardef FrontPageHeight = PaperHeight enddef ;
vardef BackPageHeight  = PaperHeight enddef ;
vardef SpineHeight     = PaperHeight enddef ;

def SetPagePage      = path Page      ; Page      := unitsquare xscaled PaperWidth      yscaled PaperHeight ; enddef ;
def SetPageCoverPage = path CoverPage ; CoverPage := unitsquare xscaled CoverWidth      yscaled CoverHeight ; enddef ;
def SetPageSpine     = path Spine     ; Spine     := unitsquare xscaled SpineWidth      yscaled CoverHeight shifted (BackPageWidth,0) ; enddef ;
def SetPageBackPage  = path BackPage  ; BackPage  := unitsquare xscaled BackPageWidth   yscaled CoverHeight ; enddef ;
def SetPageFrontPage = path FrontPage ; FrontPage := unitsquare xscaled FrontPageWidth  yscaled CoverHeight shifted (BackPageWidth+SpineWidth,0) ; enddef ;

def Page      = hide(SetPagePage     ;) Page      enddef ;
def CoverPage = hide(SetPageCoverPage;) CoverPage enddef ;
def Spine     = hide(SetPageSpine    ;) Spine     enddef ;
def BackPage  = hide(SetPageBackPage ;) BackPage  enddef ;
def FrontPage = hide(SetPageFrontPage;) FrontPage enddef ;

% pages

def StartPage =
    begingroup ;
    setbounds currentpicture to Page ;
enddef ;

def StopPage =
    setbounds currentpicture to Page ;
    endgroup ;
enddef ;

% cover pages

def StartCover =
    begingroup ;
    setbounds currentpicture to CoverPage enlarged PaperBleed ;
enddef ;

def StopCover =
    setbounds currentpicture to CoverPage enlarged PaperBleed ;
    endgroup ;
enddef ;

% overlays:

def OverlayBox =
    (unitsquare xyscaled (OverlayWidth,OverlayHeight))
enddef ;

% handy

def innerenlarged =
    if OnRightPage : leftenlarged  else : rightenlarged fi
enddef ;

def outerenlarged =
    if OnRightPage : rightenlarged else : leftenlarged  fi
enddef ;

% obsolete

% def llEnlarged (expr p,d) = (llcorner p shifted (-d,-d)) enddef ;
% def lrEnlarged (expr p,d) = (lrcorner p shifted (+d,-d)) enddef ;
% def urEnlarged (expr p,d) = (urcorner p shifted (+d,+d)) enddef ;
% def ulEnlarged (expr p,d) = (ulcorner p shifted (-d,+d)) enddef ;

% def Enlarged (expr p, d) =
%     (
%         llEnlarged (p,d) --
%         lrEnlarged (p,d) --
%         urEnlarged (p,d) --
%         ulEnlarged (p,d) --
%         cycle
%     )
% enddef ;

% for the moment we put these here:

string  RuleDirection ; RuleDirection := "" ;
string  RuleOption    ; RuleOption    := "" ;
numeric RuleWidth     ; RuleWidth     := 0 ;
numeric RuleHeight    ; RuleHeight    := 0 ;
numeric RuleDepth     ; RuleDepth     := 0 ;
numeric RuleH         ; RuleH         := 0 ;
numeric RuleV         ; RuleV         := 0 ;
numeric RuleThickness ; RuleThickness := 0 ;
numeric RuleFactor    ; RuleFactor    := 0 ;
numeric RuleOffset    ; RuleOffset    := 0 ;
                    def RuleColor      = (.5white) enddef ;

def FakeWord(expr RuleWidth, RuleHeight, RuleDepth, RuleThickness) (text RuleColor) =
    fill unitsquare
        xscaled RuleWidth
        yscaled (RuleDepth-RuleThickness/2)
        withcolor RuleColor ;
    fill unitsquare
        xscaled RuleWidth
        yscaled (RuleHeight-RuleDepth-RuleThickness/2)
        shifted (0,RuleDepth+RuleThickness)
        withcolor RuleColor ;
enddef ;

def FakeRule(expr RuleWidth, RuleHeight, RuleDepth, RuleThickness) (text RuleColor) =
    fill unitsquare
        xscaled RuleWidth
        yscaled RuleHeight
        withcolor RuleColor ;
enddef ;