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authorKarl Berry <karl@freefriends.org>2007-09-21 23:39:05 +0000
committerKarl Berry <karl@freefriends.org>2007-09-21 23:39:05 +0000
commitd647fe2f92a1bb89564a4298f9f4d044e88ee3a2 (patch)
treea7124b97210cfd83a4ed62644a9911c82b881816 /Master/texmf-dist/doc/metapost/slideshow
parent86e969af419d5eb4673019935c7c52666852b8ab (diff)
slidedhow doc in metapost (luecking, 23 Jul 2007 13:47:15)
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+Making pdf slides with metapost and ghostscript
+
+Patrick McPhee
+
+Introduction
+
+slideshow is a small macro package which simplifies the process of
+creating slide-show style presentations using plain metapost and
+ghostscript. The package assists in producing slides with dimensions
+6.4 inches wide by 4.8 inches high, which the user is then expected to
+convert into a pdf file using ghostscript as a PS distiller.
+
+This is probably not the best way of producing presentations, but it's
+put forward for interest's sake. I do not intend to formally support
+this package, however I will accept bug reports at ptjm@interlog.com,
+and will endeavour to fix incompatibilities with tremendously useful
+metapost packages such as metaobj.
+
+Usage
+
+Simply inputing slideshow.mp has several effects:
+ - each slide is given a default background which is a hundred-step
+ gradient from fairly-dark blue to medium-dark blue;
+ - the default font is changed to helvetica 8r;
+ - prologues is set to 2;
+ - a list of figures suitable for passing as an input file to ghostscript
+ is written to a file called `jobname'.ps;
+ - pdfmarks are written which cause the pdf file to automatically go
+ into full-screen mode, have a random transition pattern with
+ duration of .5 seconds between each page, crop the pages to 6.4 by
+ 4.8 inches, and set the creation date and creator in the pdf info
+ dictionary;
+ - several macros and variables are defined, which might conflict with
+ other packages. They should all be documented in this report.
+
+After creating all the metapost figures, run the file `jobname'.ps
+through ghostscript, using the pdfwrite device. ghostscript comes with a
+batch file called ps2pdf which can be used to do this, but a sufficient
+command line is:
+ gs -sDEVICE=pdfwrite -sOutputfile=jobname.pdf -dNOPAUSE jobname.ps quit.ps
+
+other parameters are possible. I've noticed smaller pdf files are
+generated by specifying a high resolution and a corresponding geometry
+(e.g., adding the flags -r10000 -g64000x48000 generates a smaller file
+than the above).
+
+The macros defined by slideshow provide support for
+ - storing author and document information in the PDF info directory;
+ - automatically generating new figure numbers;
+ - automatically saving and restoring the contents of the previous
+ figure, to allow slides to be built up, step-by-step;
+ - maintaining a vertical list of bullet points;
+ - drawing labels and bullets in yellow, after the default style of the
+ leading presentation graphics package;
+ - wrapping long text to fit within boundaries;
+ - adding hyperlinks within the presentation.
+
+Reference
+
+This section is intended to be a complete reference to all the macros
+and variables defined or changed by slideshow. If naming conflicts
+arise between this and truly useful macro packages, I will likely
+change some or all of these names to use a common prefix.
+
+ Document information
+
+ The document information macros add entries to the PDF docinfo
+ dictionary. Except for copyright, these can be seen in the acrobat
+ reader document info dialog box, and in equivalent places in other PDF
+ viewers.
+
+ These macros should be called once at the start, although they can be
+ called more than once (the last call wins) anywhere before the last
+ slide is shipped out. They are all optional. Do not include parentheses
+ in the arguments.
+
+ author(string)
+ sets the /Author entry;
+ title(string)
+ sets the /Title entry;
+ subject(string)
+ sets the /Subject entry;
+ keywords(string)
+ sets the /Keywords entry;
+ copyright(string)
+ adds a dictionary entry called /Copyright. Copyright is not a standard
+ docinfo entry, but non-standard entries are explicitly allowed by the
+ language specification, and it seems like a good idea;
+ moddate(string)
+ overrides the /ModificationDate entry. The format should be
+ D:yyyymmddhhmiss+GMTOFFSET, but everything after year is optional,
+ and the specification suggests that other formats are just fine, too;
+ createdate(string)
+ overrides the /CreationDate entry. slideshow.mp always calls createdate
+ with the current date as an argument. However, some common metapost
+ implementations don't actually return the current date, or you may have
+ your own reasons for wanting to override the automatically-generated
+ date. The format is the same as for moddate.
+
+ Constants and pseudo constants -- these could be left alone, or set once
+ once at the start:
+
+ slideshowversion - internal
+ 1.0 for this release. The decimal portion will change if the file
+ changes in an upwardly compatible manner, and the integer portion will
+ change if the file changes in an upwardly incompatible manner (e.g., the
+ names of macros change).
+
+ lawidth - number
+ the width of the figure. Can be used for positioning or drawing a frame
+ without worrying about the actual dimensions. The default is 6.4
+ inches. If lawidth is set, it must be set before slideshow.mp is input,
+ and laheight must also be set;
+
+ laheight - number
+ the height of the figure. The default is 4.8 inches. If laheight is
+ set, it must be set before slideshow.mp is input, and lawidth must also
+ be set;
+
+ background - picture
+ a lawidth by laheight rectangle filled with a blue gradiant. It is
+ placed behind the user's figure during endfig processing, after lastpicture
+ has been saved. A new background can be set by assigning a picture to
+ background (but see also header and footer). This can be done even in
+ the midst of a series of continuations.
+
+ textcolour - color
+ The colour used by the bullet, blabel, header, and footer macros. By
+ default, yellow.
+
+ defaultfont - string
+ set to phvr8r (helvetica in 8r encoding) rather than the metapost
+ default cmr10
+
+ defaultscale - number
+ amount of scaling for bullet points. takes mp default of 1
+
+ thick nib - pen
+ a relatively thick pen
+
+ thin nib - pen
+ a relatively thin pen
+
+ borigin - pair
+ The upper left corner of the bounding box for bullet points;
+
+ borigin.in - pair
+ The upper left corner of the bounding box for indented bullet points.
+ Indented bullet points are generated using bullet.in or bpoint.in;
+
+ blimit - pair
+ The lower right corner of the bounding box for all bullet points. It
+ could be useful to adjust blimit on the fly, e.g., to make room for a
+ figure at the right-hand side of a slide;
+
+ bulletpic - picture
+ The picture used as a bullet when displaying bulletted text. The
+ default is a right-pointing arrow taken from the Zapf Dingbats font. It
+ needs to be reset if textcolour is set;
+
+ baselineskip - number
+ distance between lines of text in a multi-line bullet point (default 11 bp)
+
+ parskip - number
+ distance between bullet points (default 5 bp)
+
+ parskip.in - number
+ distance between indented bullet points (default 1 bp)
+
+ boff - pair
+ the offset between the bullet and the corresponding text. The y
+ component is normally 0, but could be non-zero if it needed to;
+
+ bpos - number
+ current vertical offset from borigin. This is shared by bullets and
+ indented bullets. It might be useful to set this rather than using the
+ y component of boff;
+
+ bpos.prev - number
+ Internal-use variable which saves and restores bpos in continuous mode;
+
+ headerpos - pair
+ The location for the slide header. The header is set to the right of
+ the headerpos;
+
+ footerpos - pair
+ The location for the slide footer. The footer is set to the left of the
+ footerpos;
+
+ psfile - string
+ The name of a file which will be fed to ghostscript. The default name
+ is <jobname>.ps where the metapost input file is <jobname>.mp. If this
+ is set, it must be set before the first slide.
+
+ prologues - number
+ slideshow sets this to 2
+
+ extra_beginfig
+ slideshow adds stuff to extra_beginfig, which might cause conflicts
+ with other packages;
+
+ extra_endfig
+ slideshow adds stuff to extra_endfig, which might cause conflicts
+ with other packages;
+
+
+ Slide management
+
+ nextfig
+ calls beginfig with a figure number one larger than the previous call.
+ The advantage of this is that you don't have to keep track of the
+ figure numbers;
+
+ lastpicture - picture
+ the image of the last slide to be shipped out. This is saved
+ automatically at the end of each slide, and restored automatically if
+ continuations is set to 1;
+
+ continuations - numeric
+ Internal variable used to determine whether continuation mode is on or
+ off (1 for on, 0 for off). This should not be manipulated directly -- use
+ the continue, endcontinue, and discontinue macros instead;
+
+ docontinue - macro
+ overlays currentpicture with lastpicture. This is called automatically
+ by extra_beginfig, and has effect only if continuations is 1;
+
+ continue - macro
+ sets continuations to 1. This causes lastpicture to be assigned to each
+ new slide automatically, which allows slides to be built up
+ incrementally without repeating the previous part of the definition;
+
+ discontinue - macro
+ suspends continuation for the next slide
+
+ endcontinue - macro
+ sets continuations to 0. This stops lastpicture being assigned to each
+ new slide, and is the default behaviour;
+
+ Useful macros and variables for creating individual slides
+
+ drawgradient(colour1, colour2)
+ fills a rectangle lawidth by laheight with a hundred-step gradient from
+ colour1 at the top to colour2 at the bottom. This is used to assign a
+ gradient to background, for that oh-so-professional look;
+
+ bullet(string or picture)
+ Adjusts bpos down by parskip (unless there are no bullets on the
+ slide), then adds a bullet point to the current picture at (borigin -
+ (0, bpos)). If the argument is a string, it will be roughly broken into
+ line fragments up to xpart blimit - xpart borigin lines long, and
+ printed in defaultfont scaled defaultscale, with colour textcolour. If
+ the bullet doesn't fit on the current slide, a new slide will be
+ started with only that bullet point on the background. The formatted
+ argument is offset from the bulletpic by boff;
+
+ bullet.in(string or picture)
+ the same as bullet, but using borigin.in instead of borigin, and
+ parskip.in instead of parskip. Additional bullet types bullet.<tag> can be added by
+ defining a pair called borigin.<tag> and a numeric called
+ parskip.<tag>. Note that bpos is shared by all bullets, so it may have
+ to be manipulated to get the desired effect;
+
+ bpoint(string or picture)
+ creates a single-bullet figure (useful in continuation mode);
+
+ bpoint.in(string or picture)
+ creates a single-indented-bullet figure;
+
+ blabel(string or picture, pair)
+ as label, but withcolor textcolour. blable.rt et al also work
+
+ dotblabel(text or picture, pair)
+ as blabel, but with a dot. dotblabel.lft et al also work
+
+ breaktowidth(string, numeric)(height) -> picture
+ Sets the string infont defaultfont scaled defaultscale. If the string
+ is wider than the numeric argument, breaks it on spaces using the naive
+ algorithm (i.e, add characters to a picture until it's too wide, then
+ break at the most recent space). height should be passed the name of a
+ numeric variable, which will be set to the height of the figure less
+ baselineskip. Each line of text is set baselineskip apart.
+
+ headerpic - picture
+ If this is set, it is automatically drawn on each figure after the
+ lastpicture has been saved, but before the figure is shipped out. The
+ headerpic is not shifted before being drawn;
+
+ footerpic - picture
+ If this is set, it is automatically drawn on each figure after the
+ lastpicture has been saved, but before the figure is shipped out. The
+ footerpicis not shifted before being drawn;
+
+ header(string or picture)
+ assigns a value to headerpic. If the argument is a string, it is set in
+ defaultfont scaled defaultscale * magstep 1 and positioned with its
+ lower-left corner at headerpos. header and footer can be called at any
+ time, and the macro will take effect the next time a figure is shipped
+ out;
+
+ footer(string or picture)
+ assigns a value to headerpic. If the argument is a string, it is set in
+ defaultfont scaled defaultscale and positioned with its lower-right
+ corner at footerpos;
+
+ drawheader
+ called internally to draw headerpic
+
+ drawfooter
+ called internally to draw footerpic
+
+ folio -> string
+ expands to a string with the current figure number
+
+ encodefont(string, string)
+ The first string is the tfm-file name and the second is the postscript
+ font name. The macro defines a new font which is encoded using the 8r
+ encoding. This is necessary if you want to use most characters outside
+ the normal ascii range. If you look at the top of a metapost output
+ file which was generated with prologues=2, you'll see something like
+ this:
+ /phvr8r /Helvetica def
+ to re-encode the font, put
+ encodefont("phvr8r", "Helvetica");
+ before the first figure.
+
+ To use encodefont, you must set prologues to 0, and you must copy
+ the definitions for fshow and all other fonts (by default, pzdr)
+ using specials. Alternately, if 8r encoding is needed for only one
+ slide, you could use encodefont only for that figure.
+
+ Hyperlinking
+
+ hyperbullet(string or picture, string)
+ as bullet, but defines a pdfmark to link to a destination with the same
+ name as the second argument. The link boundary is the bounding box.
+ There is no border drawn;
+
+ hyperlabel(string or picture, pair, string)
+ as blabel, but defines a pdfmark to link to a destination with the
+ same name as the second argument. The link boundary is the bounding
+ box. There is no border drawn;
+
+ hyperdest(string)
+ labels the current page for hyperlinks using the name given as the
+ argument.
+
+ dolink(path or picture, string)
+ creates a hyperlink with the boundary being the bounding box of
+ the first argument, and the destination named in the second argument.
+ Does not draw anything, so it can be used to put a link which
+ isn't strictly related to drawing elements.
+
+Additional notes
+
+In addition to document info pdfmarks generated in response to the
+author, title, subject, keywords, and copyright macros, slideshow
+automatically generates pdfmarks which automatically put the pdf file in
+full-screen mode, and which set the transition for each page to random
+with a duration of .5 seconds.
+
+I use 6.4x4.8 inches for the dimensions because this matches the
+proportions of a PC screen.
+
+Metapost and ghostscript generally require some configuration. If you
+use the computer modern fonts (e.g., in a btex ... etex section for math),
+you need to obtain PS versions of these fonts and configure both dvips
+and ghostscript to use them. dvips has a file called psfonts.map, which
+maps TeX font metric file names to postscript font names and font files.
+dvips can look in other places for mapping information, and many
+installations will have a separate file called bsr.map. So far as I can
+tell, metapost always uses psfonts.map from the dvips configuration.
+The contents of bsr.map must be added to psfonts.map for the CM fonts
+to work. Similarly, ghostscript has a file called Fontmap which contains
+equivalent mappings. There is a Fontmap-format file for the CM fonts
+on CTAN, which should be copied to the ghostscript lib directory. The
+ghostscript Fontmap file should be edited and the line
+
+ (Fontmap.BSR) .runlibfile
+
+added to the end (Fontmap.BSR might not be the name of the file on CTAN
+-- please use the correct file name instead). Once this configuration
+change is made, everything should work well.
+
+Example
+
+Here's an example, which draws a triangle and puts text at each corner,
+then links back to the start so we can see it happen again:
+
+ input slideshow;
+ pair points[];
+ nextfig;
+ points0 = (.5lawidth, .9laheight);
+ ypart points1 = ypart points2 = .1laheight;
+ xpart points1 = lawidth - xpart points2 = .3lawidth;
+
+ pickup thin nib;
+
+ draw points1..points0 withcolor textcolour;
+ hyperdest("start");
+ endfig;
+
+ % build on previous slide for next few
+ continue;
+ nextfig;
+ pickup thin nib;
+
+ draw points0..points2 withcolor textcolour;
+ endfig;
+ nextfig;
+ pickup thin nib;
+
+ draw points2..points1 withcolor textcolour;
+ endfig;
+
+ nextfig;
+ blabel.top("A", points0);
+ endfig;
+ nextfig;
+ blabel.lft("B", points1);
+ endfig;
+ nextfig;
+ blabel.rt("C", points2);
+ endfig;
+
+ % new sequence of slides ...
+ discontinue;
+ nextfig;
+ hyperlabel("The End" infont defaultfont scaled magstep 2, (.5lawidth, .5laheight), "start");
+ endfig;
+ end
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