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.\" ========================================================================
.\"
.IX Title "Imager::Font::Wrap 3pm"
.TH Imager::Font::Wrap 3pm "2020-11-08" "perl v5.32.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
.Vb 1
\&  Imager::Font::Wrap \- simple wrapped text output
.Ve
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use Imager::Font::Wrap;
\&
\&  my $img = Imager\->new(xsize=>$xsize, ysize=>$ysize);
\&
\&  my $font = Imager::Font\->new(file=>$fontfile);
\&
\&  my $string = "..."; # text with or without newlines
\&
\&  Imager::Font::Wrap\->wrap_text( image  => $img,
\&                                 font   => $font,
\&                                 string => $string,
\&                                 x      => $left,
\&                                 y      => $top,
\&                                 width  => $width,
\&                                 .... );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This is a simple text wrapper with options to control the layout of
text within the line.
.PP
You can control the position, width and height of the text with the
\&\f(CW\*(C`image\*(C'\fR, \f(CW\*(C`x\*(C'\fR, \f(CW\*(C`y\*(C'\fR, \f(CW\*(C`width\*(C'\fR and \f(CW\*(C`height\*(C'\fR options.
.PP
You can simply calculate space usage by setting \f(CW\*(C`image\*(C'\fR to \f(CW\*(C`undef\*(C'\fR,
or set \f(CW\*(C`savepos\*(C'\fR to see how much text can fit within the given
\&\f(CW\*(C`height\*(C'\fR.
.IP "\fBwrap_text()\fR" 4
.IX Item "wrap_text()"
Draw word-wrapped text.
.RS 4
.IP "\(bu" 4
\&\f(CW\*(C`x\*(C'\fR, \f(CW\*(C`y\*(C'\fR \- The top-left corner of the rectangle the text is
formatted into.  Defaults to (0, 0).
.IP "\(bu" 4
\&\f(CW\*(C`width\*(C'\fR \- The width of the formatted text in pixels.  Defaults to the
horizontal gap between the top-left corner and the right edge of the
image.  If no image is supplied then this is required.
.IP "\(bu" 4
\&\f(CW\*(C`height\*(C'\fR \- The maximum height of the formatted text in pixels.  Not
required.
.IP "\(bu" 4
\&\f(CW\*(C`savepos\*(C'\fR \- The amount of text consumed (as a count of characters)
will be stored into the scalar this refers to.
.Sp
.Vb 4
\&  my $pagenum = 1;
\&  my $string = "...";
\&  my $font = ...;
\&  my $savepos;
\&
\&  while (length $string) { 
\&    my $img = Imager\->new(xsize=>$xsize, ysize=>$ysize);
\&    Imager::Font::Wrap\->wrap_text(string=>$string, font=>$font, 
\&                                  image=>$img, savepos => \e$savepos)
\&      or die $img\->errstr;
\&    $savepos > 0
\&      or die "Could not fit any text on page\en";
\&    $string = substr($string, $savepos);
\&    $img\->write(file=>"page$pagenum.ppm");
\&  }
.Ve
.IP "\(bu" 4
\&\f(CW\*(C`image\*(C'\fR \- The image to render the text to.  Can be supplied as
\&\f(CW\*(C`undef\*(C'\fR or not provided to simply calculate the bounding box.
.IP "\(bu" 4
\&\f(CW\*(C`font\*(C'\fR \- The font used to render the text.  Required.
.IP "\(bu" 4
\&\f(CW\*(C`size\*(C'\fR \- The size to render the font in.  Defaults to the size stored
in the font object.  Required if it isn't stored in the font object.
.IP "\(bu" 4
\&\f(CW\*(C`string\*(C'\fR \- The text to render.  This can contain non-white-space,
blanks (\s-1ASCII\s0 0x20), and newlines.
.Sp
Newlines must match /(?:\ex0A\ex0D?|\ex0D\ex0A?)/.  White-space other than
blanks and newlines are completely ignored.
.IP "\(bu" 4
\&\f(CW\*(C`justify\*(C'\fR
.Sp
The way text is formatted within each line.  Possible values include:
.RS 4
.IP "\(bu" 4
\&\f(CW\*(C`left\*(C'\fR \- left aligned against the left edge of the text box.
.IP "\(bu" 4
\&\f(CW\*(C`right\*(C'\fR \- right aligned against the right edge of the text box.
.IP "\(bu" 4
\&\f(CW\*(C`center\*(C'\fR \- centered horizontally in the text box.
.IP "\(bu" 4
fill \- all but the final line of the paragraph has spaces expanded so
that the line fills from the left to the right edge of the text box.
.RE
.RS 4
.RE
.IP "\(bu" 4
\&\f(CW\*(C`linegap\*(C'\fR \- Gap between lines of text in pixels.  This is in addition
to the size from \f(CW\*(C`$font\->font_height\*(C'\fR.  Can be positive or
negative.  Default 0.
.RE
.RS 4
.Sp
Any other parameters are passed onto Imager::Font\->\fBdraw()\fR.
.Sp
Returns a list:
.Sp
.Vb 1
\&  ($left, $top, $right, $bottom)
.Ve
.Sp
which are the bounds of the space used to layout the text.
.Sp
If \f(CW\*(C`height\*(C'\fR is set then this is the space used within that height.
.Sp
You can use this to calculate the space required to format the text
before doing it:
.Sp
.Vb 9
\&  my ($left, $top, $right, $bottom) =
\&    Imager::Font::Wrap\->wrap_text(string => $string,
\&                                  font   => $font,
\&                                  width  => $xsize);
\&  my $img = Imager\->new(xsize=>$xsize, ysize=>$bottom);
\&  Imager::Font::Wrap\->wrap_text(string => $string,
\&                                font   => $font,
\&                                width  => $xsize,
\&                                image  => $image);
.Ve
.RE
.SH "BUGS"
.IX Header "BUGS"
Imager::Font can handle \s-1UTF\-8\s0 encoded text itself, but this module
doesn't support that (and probably won't).  This could probably be
done with regex magic.
.PP
Currently ignores the \f(CW\*(C`sizew\*(C'\fR parameter, if you supply one it will be
supplied to the \fBdraw()\fR function and the text will be too short or too
long for the \f(CW\*(C`width\*(C'\fR.
.PP
Uses a simplistic text model, which is why there's no hyphenation, and
no tabs.
.SH "AUTHOR"
.IX Header "AUTHOR"
Tony Cook <tony@develop\-help.com>
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBImager\fR\|(3), \fBImager::Font\fR\|(3)