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%D \module
%D [ file=mp-abck.mpiv,
%D version=2012.02.19, % was mp-core: 1999.08.01, anchoring
%D title=\CONTEXT\ \METAPOST\ graphics,
%D subtitle=anchored background macros,
%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.
if known context_abck : endinput ; fi ;
boolean context_abck ; context_abck := true ;
path multiregs[], % region used for multipar (tracing only)
multipars[], % effective area (shape)
multibox ; % main boundingbox (of main region)
string multikind[] ; % region state: single | first | middle | last (new method)
numeric multilocs[], % 1=begin 2=between 3=end (old method)
nofmultipars ; % number of calculated areas
numeric par_strut_height,
par_strut_depth,
par_line_height ;
nofmultipars := 0 ;
par_strut_height := 0 ;
par_strut_depth := 0 ;
par_line_height := 0 ;
def boxgridoptions = withcolor .8red enddef ;
def boxlineoptions = withcolor .8blue enddef ;
def boxfilloptions = withcolor .8white enddef ;
numeric boxgridtype ; boxgridtype := 0 ;
numeric boxlinetype ; boxlinetype := 1 ;
numeric boxfilltype ; boxfilltype := 1 ;
numeric boxdashtype ; boxdashtype := 0 ;
pair boxgriddirection ; boxgriddirection := up ;
numeric boxgridwidth ; boxgridwidth := 1pt ;
numeric boxlinewidth ; boxlinewidth := 1pt ;
numeric boxlineradius ; boxlineradius := 0 ;
numeric boxlineoffset ; boxlineoffset := 0 ;
numeric boxfilloffset ; boxfilloffset := 0 ;
numeric boxgriddistance ; boxgriddistance := .5cm ;
numeric boxgridshift ; boxgridshift := 0 ;
def abck_show_path(expr p, r, c) =
draw p withpen pencircle scaled .5pt withcolor c ;
if length(p) > 2 :
begingroup ; save _c_ ; path _c_ ; _c_ := fullcircle scaled r ;
for i=0 upto length(p) if cycle p : -1 fi :
fill _c_ shifted point i of p withcolor white ;
draw _c_ shifted point i of p withpen pencircle scaled .5pt withcolor c ;
endfor ;
fi ;
enddef ;
vardef abck_draw_path(expr p) =
if (length p > 2) and (bbwidth(p) > 1) and (bbheight(p) > 1) :
save pp ; path pp ;
pp := p if (boxlineradius>0) and (boxlinetype=2) : cornered boxlineradius fi ;
if boxfilltype > 0 :
if boxfilloffset > 0 :
interim linejoin := mitered ;
filldraw pp boxfilloptions withpen pencircle scaled (2*boxfilloffset) ;
else :
fill pp boxfilloptions ;
fi ;
fi ;
if boxlinetype > 0 :
draw pp boxlineoptions withpen pencircle scaled boxlinewidth ;
fi ;
fi ;
enddef ;
def abck_grid_line(expr start, width) =
% 1 = normal, 2 = with background (i.e. no shine-through)
if boxdashtype = 2 :
draw start -- start shifted (width,0)
withpen pencircle scaled boxgridwidth
boxfilloptions ;
fi ;
draw start -- start shifted (width,0)
if boxdashtype > 0 :
dashed evenly
fi
withpen pencircle scaled boxgridwidth
boxgridoptions ;
enddef ;
vardef abck_baseline_grid(expr pxy, pdir, at_baseline) =
save width ; width := bbwidth(pxy) ;
save height ; height := bbheight(pxy) ;
if (par_line_height > 0) and (height > 1) and (width > 1) and (boxgridwidth > 0) :
save i, grid, bb ; picture grid ; pair start ; path bb ;
grid := image ( % fails with inlinespace
if pdir = up :
for i = if at_baseline : par_strut_depth else : 0 fi step par_line_height until max(height,par_line_height) :
abck_grid_line(llcorner pxy shifted (0,+i),width) ;
endfor ;
else :
for i = if at_baseline : par_strut_height else : 0 fi step par_line_height until height :
abck_grid_line(ulcorner pxy shifted (0,-i),width) ;
endfor ;
fi ;
) ;
clip grid to pxy ;
bb := boundingbox grid ;
grid := grid shifted (0,boxgridshift) ;
setbounds grid to bb ;
grid
else :
nullpicture
fi
enddef ;
vardef abck_graphic_grid(expr pxy, dx, dy, x, y) =
if (bbheight(pxy) > dy) and (bbwidth(pxy) > dx) and (boxgridwidth > 0) :
save grid ; picture grid ;
grid := image (
for i = xpart llcorner pxy step dx until xpart lrcorner pxy :
draw (i,ypart llcorner pxy) -- (i,ypart ulcorner pxy) withpen pencircle scaled boxgridwidth ;
endfor ;
for i = ypart llcorner pxy step dy until ypart ulcorner pxy :
draw (xpart llcorner pxy,i) -- (xpart lrcorner pxy,i) withpen pencircle scaled boxgridwidth ;
endfor
) shifted (x,y) ;
clip grid to pxy ;
grid
else :
nullpicture
fi
enddef ;
def draw_multi_pars =
for i=1 upto nofmultipars :
abck_draw_path(multipars[i]) ;
if boxgridtype = 1 :
draw abck_baseline_grid(multipars[i],if multilocs[i]=1: down else: up fi,true) ;
elseif boxgridtype = 2 :
draw abck_baseline_grid(multipars[i],if multilocs[i]=1: down else: up fi,false) ;
elseif boxgridtype = 3 :
draw abck_baseline_grid(multipars[i],if multilocs[i]=1: down else: up fi,true) ;
draw abck_baseline_grid(multipars[i],if multilocs[i]=1: down else: up fi,true) shifted (0,ExHeight) ;
elseif boxgridtype = 4 :
draw abck_baseline_grid(multipars[i],if multilocs[i]=1: down else: up fi,true) shifted (0,ExHeight/2) ;
elseif boxgridtype = 11 :
draw abck_graphic_grid(multipars[i],boxgriddistance,boxgriddistance,boxgriddistance/2,boxgriddistance/2) ;
elseif boxgridtype = 12 :
draw abck_graphic_grid(multipars[i],boxgriddistance,boxgriddistance,0,0) ;
fi ;
endfor ;
enddef ;
def show_multi_pars =
for i=1 upto nofmultipars :
abck_show_path(multipars[i], 6pt, .5blue) ;
endfor ;
enddef ;
def show_multi_kind =
for i=1 upto nofmultipars :
fill multipars[i]
withcolor
if multikind[i] = "single" : yellow
elseif multikind[i] = "first" : red
elseif multikind[i] = "middle" : green
elseif multikind[i] = "last" : blue
fi
withtransparency (1,.5)
;
endfor ;
enddef ;
def multi_side_draw_options = enddef ;
def draw_multi_side =
begingroup ; save p ; picture p ;
for i=1 upto nofmultipars :
p := image ( fill leftboundary multipars[i]
shifted (-boxlineoffset,0)
rightenlarged boxlinewidth boxlineoptions ;
) ;
setbounds p to multipars[i] ;
draw p ;
endfor ;
endgroup ;
enddef ;
def draw_multi_side_path text t =
begingroup ; save p ; picture p ;
for i=1 upto nofmultipars :
p := image ( draw leftboundary multipars[i]
shifted (-boxlineoffset,0)
withpen pensquare scaled boxlinewidth boxlineoptions t ;
) ;
setbounds p to multipars[i] ;
draw p ;
endfor ;
endgroup ;
enddef ;
% some extras
path posboxes[],
posregions[] ;
numeric multipages[],
nofposboxes ;
nofposboxes := 0 ;
% For the moment we keep these as they can be in use but they will
% disappear.
pair lxy[], rxy[], cxy[], llxy[], lrxy[], ulxy[], urxy[] ;
path pxy[] ;
numeric hxy[], wxy[], dxy[], nxy[] ;
def box_found (expr n,x,y,w,h,d) =
not ((x=0) and (y=0) and (w=0) and (h=0) and (d=0))
enddef ;
def initialize_box_pos (expr pos,n,x,y,w,h,d) =
pair lxy, rxy, cxy, llxy, lrxy, ulxy, urxy ;
path pxy ; numeric hxy, wxy, dxy, nxy;
lxy := (x,y) ;
llxy := (x,y-d) ;
lrxy := (x+w,y-d) ;
urxy := (x+w,y+h) ;
ulxy := (x,y+h) ;
wxy := w ;
hxy := h ;
dxy := d ;
rxy := lxy shifted (wxy,0) ;
pxy := llxy--lrxy--urxy--ulxy--cycle ;
cxy := center pxy ;
nxy := n ;
freeze_box(pos) ;
enddef ;
def freeze_box (expr pos) =
lxy[pos] := lxy ;
llxy[pos] := llxy ;
lrxy[pos] := lrxy ;
urxy[pos] := urxy ;
ulxy[pos] := ulxy ;
wxy[pos] := wxy ;
hxy[pos] := hxy ;
dxy[pos] := dxy ;
rxy[pos] := rxy ;
pxy[pos] := pxy ;
cxy[pos] := cxy ;
nxy[pos] := nxy ;
enddef ;
def initialize_box (expr n,x,y,w,h,d) =
numeric bpos ; bpos := 0 ; initialize_box_pos(bpos,n,x,y,w,h,d) ;
enddef ;
def anchor_box (expr n,x,y,w,h,d) =
currentpicture := currentpicture shifted (-x,-y) ;
enddef ;
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