Imager::Font::Wrap - simple wrapped text output

  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,
                                 .... );

This is a simple text wrapper with options to control the layout of text within the line.

You can control the position, width and height of the text with the CWimage, CWx, CWy, CWwidth and CWheight options.

You can simply calculate space usage by setting CWimage to CWundef, or set CWsavepos to see how much text can fit within the given CWheight.

x

y

The top-left corner of the rectangle the text is formatted into. Defaults to (0, 0).

width

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.

height

The maximum height of the formated text in pixels. Not required.

savepos

The amount of text consumed (as a count of characters) will be stored into the scalar this refers to.

  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 => \$savepos)
      or die $img->errstr;
    $savepos > 0
      or die "Could not fit any text on page\n";
    $string = substr($string, $savepos);
    $img->write(file=>"page$pagenum.ppm");
  }

image

The image to render the text to. Can be supplied as CWundef to simply calculate the bounding box.

font

The font used to render the text. Required.

size

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.

string

The text to render. This can contain non-whitespace, blanks (ASCII 0x20), and newlines. Newlines must match /(?:\x0A\x0D?|\x0D\x0A?)/. Whitespace other than blanks and newlines are completely ignored.

justify

The way text is formatted within each line. Possible values include:

left

Left aligned against the left edge of the text box.

right

Right aligned against the right edge of the text box.

center

Centered horizontally in the text box.

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.

linegap

Gap between lines of text in pixels. This is in addition to the size from CW$font->font_height. Can be positive or negative. Default 0.

Any other parameters are passed onto Imager::Font->draw().

Returns a list:

  ($left, $top, $right, $bottom)

which are the bounds of the space used to layout the text.

If CWheight is set then this is the space used within that height.

You can use this to calculate the space required to format the text before doing it:

  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);

Imager::Font can handle UTF8 encoded text itself, but this module doesn't support that (and probably won't). This could probably be done with regex magic.

Currently ignores the CWsizew parameter, if you supply one it will be supplied to the draw() function and the text will be too short or too long for the CWwidth.

Uses a simplistic text model, which is why there's no hyphenation, and no tabs.

Tony Cook <tony@develop-help.com>

Imager(3), Imager::Font(3)