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author | Hans Hagen <pragma@wxs.nl> | 2018-10-18 00:46:16 +0200 |
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committer | Context Git Mirror Bot <phg@phi-gamma.net> | 2018-10-18 00:46:16 +0200 |
commit | e2ee706a3114129601a30908d6b8cbb57068d32c (patch) | |
tree | 222b1047f4a7fe1144fefe5d0e52b78604a00f58 /doc | |
parent | e5f189d9965a70c8f3043c07c7b07d41ef268e93 (diff) | |
download | context-e2ee706a3114129601a30908d6b8cbb57068d32c.tar.gz |
2018-10-18 00:16:00
Diffstat (limited to 'doc')
18 files changed, 286 insertions, 0 deletions
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b/doc/context/sources/general/manuals/graphics/graphics.tex new file mode 100644 index 000000000..84a5acc22 --- /dev/null +++ b/doc/context/sources/general/manuals/graphics/graphics.tex @@ -0,0 +1,286 @@ +% language=uk + +\usemodule[article-basic] +\usemodule[abbreviations-smallcaps] +\usemodule[setups-basics] +\usemodule[scite] + +% \setupbodyfont +% [dejavu] + +\loadsetups[context-en] + +\definecolor + [mysetupscolora] + [a=1, + t=.25, + r=.5, + g=.5] + +\definecolor + [mysetupscolorb] + [a=1, + t=.25, + g=.25, + b=.25] + +\definetextbackground + [mysetups] + [before=\blank, + after=\blank, + topoffset=10pt, + leftoffset=10pt, + location=paragraph, + backgroundcolor=mysetupscolora, + backgroundcolor=mysetupscolorb, + frame=off] + +\startsetups xml:setups:start + \starttextbackground[mysetups] +\stopsetups + +\startsetups xml:setups:stop + \stoptextbackground +\stopsetups + +\starttext + +\startbuffer[image] + \startluacode + + local min, max, random = math.min, math.max, math.random + + -- kind of self-explaining: + + local xsize = 210 + local ysize = 297 + local colordepth = 1 + local usemask = true + local colorspace = "rgb" + + -- initialization: + + local bitmap = graphics.bitmaps.new(xsize,ysize,colorspace,colordepth,usemask) + + -- filling the bitmap: + + local data = bitmap.data + local mask = bitmap.mask + local minmask = 100 + local maxmask = 200 + + for i=1,ysize do + local d = data[i] + local m = mask[i] + for j=1,xsize do + d[j] = { i, max(i,j), j, min(i,j) } + m[j] = random(minmask,maxmask) + end + end + + -- flushing the lot: + + graphics.bitmaps.tocontext(bitmap) + + \stopluacode +\stopbuffer + +\definelayer + [page] + [width=\paperwidth, + height=\paperheight] + +\setlayer + [page] + {\scale + [width=\paperwidth] + {\ignorespaces + \getbuffer[image]% + \removeunwantedspaces}} + +\setlayer + [page] + [preset=rightbottom, + hoffset=10mm, + voffset=45mm] + {\scale + [width=.6\paperwidth] + {Graphics}} + +% \setlayer +% [page] +% [preset=righttop, +% hoffset=10mm, +% voffset=20mm] +% {\rotate{\scale +% [width=.3\paperheight] +% {\ConTeXt\ MkIV}}} + +\setlayer + [page] + [preset=rightbottom, + hoffset=10mm, + voffset=20mm] + {\scale + [width=.6\paperwidth] + {Hans Hagen}} + +\startpagemakeup + \flushlayer[page] + \vfill +\stoppagemakeup + +\startsubject[title=Introduction] + +This manual is about integrating graphics your document. Doing this is not really +that complex so this manual will be short. Because graphic inclusion is related +to the backend some options will discussed. It's typical one of these manuals +that can grow over time. + +\stopsubject + +\startsubject[title=Inclusion] + +The command to include an image is: + +\showsetup{externalfigure} + +and its related settings are: + +\showsetup{setupexternalfigure} + +So you can say: + +\starttyping[option=TEX] +\externalfigure[cow.pdf][width=4cm] +\stoptyping + +The suffix is optional, which means that this will also work: + +\starttyping[option=TEX] +\externalfigure[cow][width=4cm] +\stoptyping + +\stopsubject + +\startsubject[title=Defining] + +{\em todo} + +\showsetup{useexternalfigure} +\showsetup{defineexternalfigure} +\showsetup{registerexternalfigure} + +\stopsubject + +\startsubject[title=Analyzing] + +{\em todo} + +\showsetup{getfiguredimensions} + +\showsetup{figurefilename} +\showsetup{figurefilepath} +\showsetup{figurefiletype} +\showsetup{figurefullname} +\showsetup{figureheight} +\showsetup{figurenaturalheight} +\showsetup{figurenaturalwidth} +\showsetup{figuresymbol} +\showsetup{figurewidth} + +\showsetup{noffigurepages} + +\stopsubject + +\startsubject[title=Collections] + +{\em todo} + +\showsetup{externalfigurecollectionmaxheight} +\showsetup{externalfigurecollectionmaxwidth} +\showsetup{externalfigurecollectionminheight} +\showsetup{externalfigurecollectionminwidth} +\showsetup{externalfigurecollectionparameter} +\showsetup{startexternalfigurecollection} + +\stopsubject + +\startsubject[title=Conversion] + +{\em todo} + +\stopsubject + +\startsubject[title=Figure databases] + +{\em todo} + +\showsetup{usefigurebase} + +\stopsubject + +\startsubject[title=Overlays] + +{\em todo} + +\showsetup{overlayfigure} +\showsetup{pagefigure} + +\stopsubject + +\startsubject[title=Scaling] + +Images are normally scaled proportionally but if needed you can give an +explicit height and width. The \type {\scale} command shares this property +and can be used to scale in the same way as \type {\externalfigure}. I will +illustrate this with an example. + +You can define your own bitmaps, like I did with the cover of this manual: + +\typebuffer[image][option=LUA] + +The actually inclusion of this image happened with: + +\starttyping[option=TEX] +\scale + [width=\paperwidth] + {\getbuffer[image]} +\stoptyping + +\stopsubject + +\startsubject[title=The backend] + +Traditionally \TEX\ sees an image as just a box with dimensions and in \LUATEX\ +it is actually a special kind of rule that carries information about what to +inject in the final (\PDF) file. In regular \LUATEX\ the core formats \type +{pdf}, \type {png}, \type {jpg} and \type {jp2} are dealt with by the backend but +in \CONTEXT\ we can use \LUA\ instead. We might default to that method at some +point but for now you need to enable that explicitly: + +\starttyping[option=TEX] +\enabledirectrive[graphics.pdf.uselua] +\enabledirectrive[graphics.jpg.uselua] +\enabledirectrive[graphics.jp2.uselua] +\enabledirectrive[graphics.png.uselua] +\stoptyping + +All four can be enabled with: + +\starttyping[option=TEX] +\enabledirectrive[graphics.uselua] +\stoptyping + +Performance|-|wise only \PNG\ inclusion can be less efficient, but only when you +use interlaced images or large images with masks. It makes no real sense in a +professional workflow to use the (larger) interlaced images, and masks are seldom +used at high resolutions, so in practice one will not really notice loss of +performance. + +The advantage of this method is that we can provide more options, intercept bad +images that make the backend abort and lessen the dependency on libraries. + +\stopsubject + +\stoptext |