@Section
    @Title { Page size and page orientation }
    @Tag { pagesize }
@Begin
@PP
This section explains how to use the setup file options that determine
page size and page orientation.  Here they are with their default values:
page.type @Index @Code "@PageType"
@ID @OneRow @Code @Verbatim {
@PageType { A4 }
@PageWidth {}
@PageHeight {}
@PageOrientation { Portrait }
}
The default value at your site may be different, since installers of
Lout are recommended to set it to the usual size of a piece of paper
at their location.  The easy way to change the page size is to set
the @Code "@PageType" option to the name of the paper you use:
@ID @Tab
    vmargin { 0.5vx }
    @Fmtb { @Col ! @Col ! @Col @I @RR B ! @Col @I @RR C }
    @Fmta { @Col @Code { "@PageType {" A "}" } ! @Col ! @Col @Code @CC B !
            @Col @Code @CC C }
{
@Rowb B { width in points }          C { height in points }
@Rowa A { Letter }	B {  612p }  C {  792p }
@Rowa A { Tabloid }	B {  792p }  C { 1224p }
@Rowa A { Ledger }	B { 1224p }  C {  792p }
@Rowa A { Legal  }	B {  612p }  C { 1008p }
@Rowa A { Statement }	B {  396p }  C {  612p }
@Rowa A { Executive }	B {  540p }  C {  720p }
@Rowa A { A0 }		B { 2380p }  C { 3368p }
@Rowa A { A1 }		B { 1684p }  C { 2380p }
@Rowa A { A2 }		B { 1190p }  C { 1684p }
@Rowa A { A3 }		B {  842p }  C { 1190p }
@Rowa A { A4 }		B {  595p }  C {  842p }
@Rowa A { A5 }		B {  420p }  C {  595p }
@Rowa A { ISOB4 }	B {  709p }  C { 1001p }
@Rowa A { ISOB5 }	B {  499p }  C {  709p }
@Rowa A { JISB4 }	B {  729p }  C { 1032p }
@Rowa A { JISB5 }	B {  516p }  C {  729p }
@Rowa A { B4 }		B {  729p }  C { 1032p }
@Rowa A { B5 }		B {  516p }  C {  729p }
@Rowa A { Folio }	B {  612p }  C {  936p }
@Rowa A { Quarto }	B {  610p }  C {  780p }
@Rowa A { 10x14 }	B {  720p }  C { 1008p }
}
This will automatically assign the widths and heights shown above to
the @Code "@PageWidth" and @Code "@PageHeight" options, so you don't
have to worry about those options.  It is recommended that {@Code ISOB4}
or {@Code JISB4} be used instead of {@Code B4}, and that {@Code ISOB5}
or {@Code JISB5} be used instead of {@Code B5}.  If your paper size
is not on this list, set @Code "@PageType" to @Code Other and supply
your own width and height:
page.width @Index @Code "@PageWidth"
page.height @Index @Code "@PageHeight"
@ID @Tab
    vmargin { 0.5vx }
    @Fmta { @Col @Code A }
{
@Rowa A { "@PageType { Other }" }
@Rowa A { "@PageWidth { 12.0c }" }
@Rowa A { "@PageHeight { 18.0c }" }
}
The width and height may each be any length (Section {@NumberOf objects}),
and do not have to be in points.
@PP
The basic page orientations are @I portrait and @I landscape:
page.orientation @Index @Code "@PageOrientation"
@ID @Tab
    @Fmta { @Col 8c @Wide @Code A ! @Col B }
{
@Rowa
    A { "@PageOrientation { Portrait }" }
    B { @Box 1.0c @Wide 1.4c @High { Hello } }
@Rowa
@Rowa
    A { "@PageOrientation { Landscape }" }
    B { @Box 1.4c @Wide 1.0c @High { Hello } }
}
When changing to {@Code Landscape}, do not change the page type, page
width, or page height, and do not change the way you feed your paper
into the printer.  Lout knows what to do.
@PP
Two other orientations are provided which are 180@Degree rotations of
the basic ones:
@ID @Tab
    @Fmta { @Col 8c @Wide @Code A ! @Col B }
{
@Rowa
    A { "@PageOrientation { ReversePortrait }" }
    B { @Box 1.0c @Wide 1.4c @High { //1rt &1rt 180d @Rotate Hello } }
@Rowa
@Rowa
    A { "@PageOrientation { ReverseLandscape }" }
    B { @Box 1.4c @Wide 1.0c @High { //1rt &1rt 180d @Rotate Hello } }
}
# @Code ReverseLandscape might be useful when post-processing the
# PostScript output to print two landscape pages per sheet.
The @Code "@PageOrientation" symbol is available at the start of a
document, as well as in the setup file, like {@Code "@InitialFont"}
and {@Code "@PageHeaders"}.
@End @Section
