I have written Python classes to automate reading a Tumblr blog and writing a
file for processing by ConTeXt. No manual editing of the ConTeXt input file is
allowed.
Photos are incorporated in a graphic created using METAPOST commands embedded
in the ConTeXt input file. Then the graphic is used as a background. I need
this background to appear only on one page.
My current solution is to use TeX conditionals to test if the page number has
incremented, then reset the background to empty. This approach fails in many
cases. The code below provides a minimum working example of a failure. Photos
are shown as squares to reduce the size of this post.
Is there a better way to reset the background?
ConTeXt ver: 2011.05.18 18:04 MKIV fmt: 2011.7.13 int: english/english
this is luatex, version beta-0.70.1-2011051908 (rev 4277)
% == Start Minimum Working Example ==
\pdfminorversion=5
\definepapersize[LG1][width=8.5in,height=8.5in]
\definepapersize[LP1][width=8.5in,height=8.5in]
\setuppapersize[LG1][LP1]
\definelayout[contents_1]
[backspace=3.25in,
leftmargin=2.25in,
leftmargindistance=0.25in,
width=4.75in,
rightmargindistance=0.25in,
rightmargin=0.25in,
topspace=0.5in,
header=0.25in,
headerdistance=4.75in,
height=7.75in,
footerdistance=0.25in,
footer=0.25in]
\definelayout[contents_2]
[backspace=3.25in,
leftmargin=2.25in,
leftmargindistance=0.25in,
width=4.75in,
rightmargindistance=0.25in,
rightmargin=0.25in,
topspace=0.5in,
header=0.25in,
headerdistance=3.5in,
height=7.75in,
footerdistance=0.25in,
footer=0.25in]
\definelayout[contents_4]
[backspace=3.25in,
leftmargin=2.25in,
leftmargindistance=0.25in,
width=4.75in,
rightmargindistance=0.25in,
rightmargin=0.25in,
topspace=0.5in,
header=0.25in,
headerdistance=1.0in,
height=7.75in,
footerdistance=0.25in,
footer=0.25in]
\setupwhitespace[small]
\setupfloats[spacebefore=none]
\setuppagenumbering[location=footer,style=\white]
\starttext
\setupheader[state=start]
\setupheadertexts[\hbox to 2.5in{MARCH}THESOUNDARABBITMAKES][][][]
\setuppagenumber[state=start]
\setupfooter[state=start]
\setupfootertexts[\pagenumber][]
\page
\setupbackgrounds[page][background={{}}]
\setuplayout[contents_4]
\hskip1em
\page
\startuniqueMPgraphic{2e31ddc5-43da-4879-a223-61674e0df438}
page_width := 8.5in;
page_height := 8.5in;
draw (0, 0)--(page_width, 0)
withpen pencircle scaled 1bp withcolor white;
draw (0, 0)--(0, page_height)
withpen pencircle scaled 1bp withcolor white;
photo_grp_x_shift := 3.25in;
photo_grp_y_shift := 3.25in;
photo_grp_width := 4.75in;
photo_grp_height := 4.75in;
draw (photo_grp_x_shift, photo_grp_y_shift)
--(photo_grp_x_shift, photo_grp_y_shift + photo_grp_height)
--(photo_grp_x_shift + photo_grp_width, photo_grp_y_shift + photo_grp_height)
--(photo_grp_x_shift + photo_grp_width, photo_grp_y_shift)
--(photo_grp_x_shift, photo_grp_y_shift)
withpen pencircle scaled 1bp withcolor black;
photo_grp_x_shift := 0.75in;
photo_grp_y_shift := 5.75in;
photo_grp_width := 2.25in;
photo_grp_height := 2.25in;
draw (photo_grp_x_shift, photo_grp_y_shift)
--(photo_grp_x_shift, photo_grp_y_shift + photo_grp_height)
--(photo_grp_x_shift + photo_grp_width, photo_grp_y_shift + photo_grp_height)
--(photo_grp_x_shift + photo_grp_width, photo_grp_y_shift)
--(photo_grp_x_shift, photo_grp_y_shift)
withpen pencircle scaled 1bp withcolor black;
photo_grp_x_shift := 0.75in;
photo_grp_y_shift := 3.25in;
photo_grp_width := 2.25in;
photo_grp_height := 2.25in;
draw (photo_grp_x_shift, photo_grp_y_shift)
--(photo_grp_x_shift, photo_grp_y_shift + photo_grp_height)
--(photo_grp_x_shift + photo_grp_width, photo_grp_y_shift + photo_grp_height)
--(photo_grp_x_shift + photo_grp_width, photo_grp_y_shift)
--(photo_grp_x_shift, photo_grp_y_shift)
withpen pencircle scaled 1bp withcolor black;
\stopuniqueMPgraphic
\defineoverlay[2e31ddc5-43da-4879-a223-61674e0df438][\uniqueMPgraphic{2e31ddc5-43da-4879-a223-61674e0df438}]
\setupbackgrounds[page][background={{2e31ddc5-43da-4879-a223-61674e0df438}}]
\setuplayout[contents_1]
\edef\lastpagenumber{\pagenumber}
{\bf November 08, 2010}
({\bf Enryakuji})
\ifnum\pagenumber>\lastpagenumber
\setupbackgrounds[page][background={{}}]\setuplayout[contents_4]
\fi\pagenumber\par
My labmates, professor, and I visited this temple in Shiga prefecture last
weekend to see the 紅葉 ({\bf kouyou} , autumn colors). Amazingly even though it
is November, many of the trees had not changed yet. But the trees whose foliage
had changed were beautiful!
\ifnum\pagenumber>\lastpagenumber
\setupbackgrounds[page][background={{}}]\setuplayout[contents_4]
\fi\pagenumber\par
When we saw the trees, we all exclaimed in our native languages:
\ifnum\pagenumber>\lastpagenumber
\setupbackgrounds[page][background={{}}]\setuplayout[contents_4]
\fi\pagenumber\par
Tres jolie!
\ifnum\pagenumber>\lastpagenumber
\setupbackgrounds[page][background={{}}]\setuplayout[contents_4]
\fi\pagenumber\par
Tres jolie!
\ifnum\pagenumber>\lastpagenumber
\setupbackgrounds[page][background={{}}]\setuplayout[contents_4]
\fi\pagenumber\par
Tres jolie!
\ifnum\pagenumber>\lastpagenumber
\setupbackgrounds[page][background={{}}]\setuplayout[contents_4]
\fi\pagenumber\par
Tres jolie!
\ifnum\pagenumber>\lastpagenumber
\setupbackgrounds[page][background={{}}]\setuplayout[contents_4]
\fi\pagenumber\par
Wow. So pretty!
\ifnum\pagenumber>\lastpagenumber
\setupbackgrounds[page][background={{}}]\setuplayout[contents_4]
\fi\pagenumber\par
\page
\setupbackgrounds[page][background={{}}]
\setuplayout[contents_4]
\hskip1em
\stoptext
% == Stop Minimum Working Example ==
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