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diff --git a/doc/user/typ_illu b/doc/user/typ_illu new file mode 100644 index 0000000..532b42b --- /dev/null +++ b/doc/user/typ_illu @@ -0,0 +1,85 @@ +@Section + @Title { Stand-alone illustrations } + @Tag { illustrations } +@Begin +@PP +This section describes how to use Lout to produce an illustration for +stand.alone.illustrations. @Index { stand-alone illustrations } +illustrations. @Index { illustrations } +inclusion in some other document, which may itself be a Lout document +but need not be. The opposite process, the inclusion of an illustration +in a Lout document, is the subject of Section {@NumberOf include}. +@PP +Suppose you want to produce the following logo +for inclusion in some other document: +@ID { +45d @Rotate @CurveBox { ARMY @LP 180d @Rotate ARMY } +} +This is just an object, and it is not hard to make it using Lout's +graphics features: +@ID @Code "45d @Rotate @CurveBox { ARMY @LP 180d @Rotate ARMY }" +The problem is that objects ordinarily come out on pages with margins, +page numbers, and so forth, which we don't want here. The solution +is to use the illustration document type, whose setup file, curiously +enough, is called {@Code "picture"}: +illustration. @Index @Code "@Illustration" +@ID @OneRow @Code { +"@SysInclude { picture }" +"@Illustration {" +" 45d @Rotate @CurveBox { ARMY @LP 180d @Rotate ARMY }" +"}" +} +After the usual @Code "@SysInclude" line comes one @Code "@Illustration" +symbol. Following it is an arbitrary object which becomes the entire +result, with no pages and no margins, ready for inclusion in some other +document as an illustration. +@PP +The @Code "@Illustration" symbol has options for setting the initial +font, paragraph breaking style, colour, and language. Here they are +with their default values: +@ID @OneRow @Code { +"@Illustration" +" @InitialFont { Times Base 12p }" +" @InitialBreak { adjust 1.2fx hyphen }" +" @InitialSpace { lout }" +" @InitialLanguage { English }" +" @InitialColour { black }" +"{" +" ..." +"}" +} +You can specify any colour from the list in Section {@NumberOf colour}, +for example {@Code blue}, and then your illustration will have that +colour wherever it is included. +@PP +Because there are no pages, the width and height of the result are +indeterminate, depending on how large the object turns out to be. This +makes things very awkward for filled paragraphs and centring, which depend +on knowing how much space is available to be occupied. So you should either +avoid filled paragraphs and all displays and lists altogether in +illustrations, or else enclose your object in a @Code "@Wide" symbol: +wide @RawIndex { @Code "@Wide" } +wide.illustrations @SubIndex { with illustrations } +@ID @OneRow @Code { +"@Illustration 5c @Wide {" +" ..." +"}" +} +to make clear how wide you want your illustration to be. +@PP +The technical name for a file containing a stand-alone illustration +encapsulated.postscript @Index { encapsulated PostScript file } +eps @Index { EPS file } +is `encapsulated PostScript file' or `EPS file' for short. To get +Lout to produce an encapsulated PostScript file instead of an ordinary +PostScript file, you have to use the @Code "-EPS" Unix command line +flag. For example, suppose the Lout file containing our example +illustration is called {@Code "army"}; then the appropriate Unix +command for formatting it is +@ID @Code "lout -EPS army > army.eps" +An EPS file is supposed to contain only one `page', so Lout will refuse +to generate any second or subsequent pages when the @Code "-EPS" flag +is given. There is also a minor difference in format between ordinary +and encapsulated PostScript files, which is why the @Code "-EPS" flag +is needed at all. +@End @Section |