Image::Base: Base class for loading, manipulating and saving images.

SYNOPSIS

This class should not be used directly. Known inheritors are Image::Xbm and Image::Xpm.

    use Image::Xpm ;

    my $i = Image::Xpm->new( -file => 'test.xpm' ) ;
    $i->line( 1, 1, 3, 7, 'red' ) ;
    $i->ellipse( 3, 3, 6, 7, '#ff00cc' ) ;
    $i->rectangle( 4, 2, 9, 8, 'blue' ) ;

If you want to create your own algorithms to manipulate images in terms of (x,y,colour) then you could extend this class (without changing the file), like this:

# Filename: mylibrary.pl package Image::Base ; # Switch to this class to build on it.

sub mytransform { my $self = shift ; my $class = ref( $self ) || $self ;

# Perform your transformation here; might be drawing a line or filling # a rectangle or whatever... getting/setting pixels using $self->xy(). }

package main ; # Switch back to the default package.

Now if you \*(C`require\*(C' mylibrary.pl after you've \*(C`use\*(C'd Image::Xpm or any other Image::Base inheriting classes then all these classes will inherit your \*(C`mytransform()\*(C' method.

DESCRIPTION

\$1

my $bitmap = Image::Xbm->new( -file => 'bitmap.xbm' ) ; my $pixmap = $bitmap->new_from_image( 'Image::Xpm', -cpp => 1 ) ; $pixmap->save( 'pixmap.xpm' ) ;

Note that the above will only work if you've installed Image::Xbm and Image::Xpm, but will work correctly for any image object that inherits from Image::Base and respects its \s-1API\s0.

You can use this method to transform an image to another image of the same type but with some different characteristics, e.g.

my $p = Image::Xpm->new( -file => 'test1.xpm' ) ; my $q = $p->new_from_image( ref $p, -cpp => 2, -file => 'test2.xpm' ) ; $q->save ; $i->line( $x0, $y0, $x1, $y1, $colour ) ;

Draw a line from point ($x0,$y0) to point ($x1,$y1) in colour $colour. $i->ellipse( $x0, $y0, $x1, $y1, $colour ) ;

Draw an oval enclosed by the rectangle whose top left is ($x0,$y0) and bottom right is ($x1,$y1) using a line colour of $colour. $i->rectangle( $x0, $y0, $x1, $y1, $colour, $fill ) ;

Draw a rectangle whose top left is ($x0,$y0) and bottom right is ($x1,$y1) using a line colour of $colour. If $fill is true then the rectangle will be filled. Virtual - must be overridden.

Recommend that it at least supports \*(C`-file\*(C' (filename), \*(C`-width\*(C' and \*(C`-height\*(C'. Not implemented. Recommended for inheritors. Should accept a string serialised using serialise() and return an object (reference). Not implemented. Recommended for inheritors. Should return a string representation (ideally compressed). my $width = $i->get( -width ) ; my( $hotx, $hoty ) = $i->get( -hotx, -hoty ) ;

Get any of the object's attributes. Multiple attributes may be requested in a single call.

See \*(C`xy\*(C' get/set colours of the image itself. Virtual - must be overridden.

Set any of the object's attributes. Multiple attributes may be set in a single call; some attributes are read-only.

See \*(C`xy\*(C' get/set colours of the image itself. Virtual - must be overridden. Expected to provide the following functionality:

$i->xy( 4, 11, '#123454' ) ; # Set the colour at point 4,11 my $v = $i->xy( 9, 17 ) ; # Get the colour at point 9,17

Get/set colours using x, y coordinates; coordinates start at 0.

When called to set the colour the value returned is class specific; when called to get the colour the value returned is the colour name, e.g. 'blue' or '#f0f0f0', etc, e.g.

$colour = xy( $x, $y ) ; # e.g. #123456 xy( $x, $y, $colour ) ; # Return value is class specific

We don't normally pick up the return value when setting the colour. Virtual - must be overridden. Expected to provide the following functionality:

$i->load ; $i->load( 'test.xpm' ) ;

Load the image whose name is given, or if none is given load the image whose name is in the \*(C`-file\*(C' attribute. Virtual - must be overridden. Expected to provide the following functionality:

$i->save ; $i->save( 'test.xpm' ) ;

Save the image using the name given, or if none is given save the image using the name in the \*(C`-file\*(C' attribute. The image is saved in xpm format.

Image::Base (3pm)

SYNOPSIS

DESCRIPTION

CHANGES

AUTHOR

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