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NAME Image::Xbm - Load, create, manipulate and save xbm image files. SYNOPSIS use Image::Xbm ; my $j = Image::Xbm->new( -file, 'balArrow.xbm' ) ; my $i = Image::Xbm->new( -width => 10, -height => 16 ) ; my $h = $i->new ; # Copy of $i my $p = Image::Xbm->new_from_string( "###\n#-#\n###" ) ; my $q = $p->new_from_string( "H##", "#-#", "###" ) ; my $s = $q->serialse ; # Compresses a little too. my $t = Image::Xbm->new_from_serialsed( $s ) ; $i->xybit( 5, 8, 1 ) ; # Set a bit print '1' if $i->xybit( 9, 3 ) ; # Get a bit print $i->xy( 4, 5 ) ; # Will print black or white $i->vec( 24, 0 ) ; # Set a bit using a vector offset print '1' if $i->vec( 24 ) ; # Get a bit using a vector offset print $i->get( -width ) ; # Get and set object and class attributes $i->set( -height, 15 ) ; $i->load( 'test.xbm' ) ; $i->save ; print "equal\n" if $i->is_equal( $j ) ; print $j->as_string ; #####- ###--- ###--- #--#-- #---#- -----# print $j->as_binstring ; 1111101110001110001001001000100000010000 View an xbm file from the command line: % perl -MImage::Xbm -e'print Image::Xbm->new(-file,shift)->as_string' file Create an xbm file from the command line: % perl -MImage::Xbm -e'Image::Xbm->new_from_string("###\n#-#\n-#-")->save("test.xbm")' DESCRIPTION This class module provides basic load, manipulate and save functionality for the xbm file format. It inherits from "Image::Base" which provides additional manipulation functionality, e.g. "new_from_image()". See the "Image::Base" pod for information on adding your own functionality to all the "Image::Base" derived classes. new() my $i = Image::Xbm->new( -file => 'test.xbm' ) ; my $j = Image::Xbm->new( -width => 12, -height => 18 ) ; my $k = $i->new ; We can create a new xbm image by reading in a file, or by creating an image from scratch (all the bits are unset by default), or by copying an image object that we created earlier. If we set "-file" then all the other arguments are ignored (since they're taken from the file). If we don't specify a file, "-width" and "-height" are mandatory. "-file" The name of the file to read when creating the image. May contain a full path. This is also the default name used for "load"ing and "save"ing, though it can be overridden when you load or save. "-width" The width of the image; taken from the file or set when the object is created; read-only. "-height" The height of the image; taken from the file or set when the object is created; read-only. "-hotx" The x-coord of the image's hotspot; taken from the file or set when the object is created. Set to -1 if there is no hotspot. "-hoty" The y-coord of the image's hotspot; taken from the file or set when the object is created. Set to -1 if there is no hotspot. "-bits" The bit vector that stores the image; read-only. new_from_string() my $p = Image::Xbm->new_from_string( "###\n#-#\n###" ) ; my $q = $p->new_from_string( "H##", "#-#", "###" ) ; my $r = $p->new_from_string( $p->as_string ) ; Create a new bitmap from a string or from an array or list of strings. If you want to use different characters you can: Image::Xbm->set( -setch => 'X', -unsetch => ' ' ) ; my $s = $p->new_from_string( "XXX", "X X", "XhX" ) ; You can also specify a hotspot by making one of the characters a 'H' (set bit hotspot) or 'h' (unset bit hotspot) -- you can use different characters by setting "-sethotch" and "-unsethotch" respectively. new_from_serialised() my $i = Image::Xbm->new_from_serialised( $s ) ; Creates an image from a string created with the "serialse()" method. Since such strings are a little more compressed than xbm files or Image::Xbm objects they might be useful if storing a lot of bitmaps, or for transferring bitmaps over comms links. serialise() my $s = $i->serialise ; Creates a string version of the image which can be completed recreated using the "new_from_serialised" method. get() 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 "xy" and "vec" to get/set bits of the image itself. set() $i->set( -hotx => 120, -hoty => 32 ) ; Set any of the object's attributes. Multiple attributes may be set in a single call. Except for "-setch" and "-unsetch" all attributes are object attributes; some attributes are read-only. See "xy" and "vec" to get/set bits of the image itself. class attributes Image::Xbm->set( -setch => 'X' ) ; $i->set( -setch => '@', -unsetch => '*' ) ; "-setch" The character to print set bits as when using "as_string", default is '#'. This is a class attribute accessible from the class or an object via "get" and "set". "-unsetch" The character to print set bits as when using "as_string", default is '-'. This is a class attribute accessible from the class or an object via "get" and "set". "-sethotch" The character to print set bits as when using "as_string", default is 'H'. This is a class attribute accessible from the class or an object via "get" and "set". "-unsethotch" The character to print set bits as when using "as_string", default is 'h'. This is a class attribute accessible from the class or an object via "get" and "set". xybit() $i->xy( 4, 11, 1 ) ; # Set the bit at point 4,11 my $v = $i->xy( 9, 17 ) ; # Get the bit at point 9,17 Get/set bits using x, y coordinates; coordinates start at 0. xy() $i->xy( 4, 11, 'black' ) ; # Set the bit from a colour at point 4,11 my $v = $i->xy( 9, 17 ) ; # Get the bit as a colour at point 9,17 Get/set bits using colours using x, y coordinates; coordinates start at 0. If set with a colour of 'black' or a numeric value > 0 or a string not matching /^#0+$/ then the bit will be set, otherwise it will be cleared. If you get a colour you will always get 'black' or 'white'. vec() $i->vec( 43, 0 ) ; # Unset the bit at offset 43 my $v = $i->vec( 87 ) ; # Get the bit at offset 87 Get/set bits using vector offsets; offsets start at 0. load() $i->load ; $i->load( 'test.xbm' ) ; Load the image whose name is given, or if none is given load the image whose name is in the "-file" attribute. save() $i->save ; $i->save( 'test.xbm' ) ; Save the image using the name given, or if none is given save the image using the name in the "-file" attribute. The image is saved in xbm format, e.g. #define test_width 6 #define test_height 6 static unsigned char test_bits[] = { 0x1f, 0x07, 0x07, 0x09, 0x11, 0x20 } ; is_equal() print "equal\n" if $i->is_equal( $j ) ; Returns true (1) if the images are equal, false (0) otherwise. Note that hotspots and filenames are ignored, so we compare width, height and the actual bits only. as_string() print $i->as_string ; Returns the image as a string, e.g. #####- ###--- ###--- #--#-- #---#- -----# The characters used may be changed by "set"ting the "-setch" and "-unsetch" characters. If you give "as_string" a parameter it will print out the hotspot if present using "-sethotch" or "-unsethotch" as appropriate, e.g. print $n->as_string( 1 ) ; H## #-# ### as_binstring() print $i->as_binstring ; Returns the image as a string of 0's and 1's, e.g. 1111101110001110001001001000100000010000 CHANGES 2000/11/09 Added Jerrad Pierce's patch to allow load() to accept filehandles or strings; will document in next release. 2000/05/05 Added new_from_serialised() and serialise() methods. 2000/05/04 Made xy() compatible with Image::Base, use xybit() for the earlier functionality. 2000/05/01 Improved speed of vec(), xy() and as_string(). Tried use integer to improve speed but according to Benchmark it made the code slower so I dropped it; interestingly perl 5.6.0 was around 25% slower than perl 5.004 with and without use integer. 2000/04/30 Created. AUTHOR Mark Summerfield. I can be contacted as <summer AT perlpress.com> - please include the word 'xbm' in the subject line. COPYRIGHT Copyright (c) Mark Summerfield 2000. All Rights Reserved. This module may be used/distributed/modified under the LGPL.
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