class Magick::ImageList


Attributes

scene[R]

Public Class Methods

new(*filenames, &block) click to toggle source

Initialize new instances

# File lib/rmagick_internal.rb, line 1541
def initialize(*filenames, &block)
  @images = []
  @scene = nil
  filenames.each do |f|
    Magick::Image.read(f, &block).each { |n| @images << n }
  end
  if length > 0
    @scene = length - 1 # last image in array
  end
  self
end

Public Instance Methods

*(other) click to toggle source
# File lib/rmagick_internal.rb, line 1318
def *(other)
  Kernel.raise ArgumentError, "Integer required (#{other.class} given)" unless other.is_a? Integer
  current = get_current
  ilist = self.class.new
  (@images * other).each { |image| ilist << image }
  ilist.set_current current
  ilist
end
<<(obj) click to toggle source
# File lib/rmagick_internal.rb, line 1327
def <<(obj)
  is_an_image obj
  @images << obj
  @scene = @images.length - 1
  self
end
<=>(other) click to toggle source

Compare ImageLists Compare each image in turn until the result of a comparison is not 0. If all comparisons return 0, then

return if A.scene != B.scene
return A.length <=> B.length
# File lib/rmagick_internal.rb, line 1339
def <=>(other)
  Kernel.raise TypeError, "#{self.class} required (#{other.class} given)" unless other.is_a? self.class
  size = [length, other.length].min
  size.times do |x|
    r = self[x] <=> other[x]
    return r unless r.zero?
  end
  return 0 if @scene.nil? && other.scene.nil?

  Kernel.raise TypeError, "cannot convert nil into #{other.scene.class}" if @scene.nil? && !other.scene.nil?
  Kernel.raise TypeError, "cannot convert nil into #{scene.class}" if !@scene.nil? && other.scene.nil?
  r = scene <=> other.scene
  return r unless r.zero?

  length <=> other.length
end
[](*args) click to toggle source
# File lib/rmagick_internal.rb, line 1356
def [](*args)
  a = @images[*args]
  if a.respond_to?(:each)
    ilist = self.class.new
    a.each { |image| ilist << image }
    a = ilist
  end
  a
end
[]=(*args) click to toggle source
# File lib/rmagick_internal.rb, line 1366
def []=(*args)
  obj = @images.[]=(*args)
  if obj && obj.respond_to?(:each)
    is_an_image_array(obj)
    set_current obj.last.__id__
  elsif obj
    is_an_image(obj)
    set_current obj.__id__
  else
    set_current nil
  end
  obj
end
__map__(&block)

ImageList#map took over the “map” name. Use alternatives.

Alias for: collect
__map__!(&block)
Alias for: collect!
__respond_to__?(meth_id, priv = false)

Ensure respond_to? answers correctly when we are delegating to Image

Alias for: respond_to?
clear() click to toggle source
# File lib/rmagick_internal.rb, line 1390
def clear
  @scene = nil
  @images.clear
end
clone() click to toggle source
# File lib/rmagick_internal.rb, line 1395
def clone
  ditto = dup
  ditto.freeze if frozen?
  ditto
end
collect(&block) click to toggle source

override Enumerable#collect

# File lib/rmagick_internal.rb, line 1402
def collect(&block)
  current = get_current
  a = @images.collect(&block)
  ilist = self.class.new
  a.each { |image| ilist << image }
  ilist.set_current current
  ilist
end
Also aliased as: __map__
collect!(&block) click to toggle source
# File lib/rmagick_internal.rb, line 1411
def collect!(&block)
  @images.collect!(&block)
  is_an_image_array @images
  self
end
Also aliased as: map!, __map__!
compact() click to toggle source
# File lib/rmagick_internal.rb, line 1440
def compact
  current = get_current
  ilist = self.class.new
  a = @images.compact
  a.each { |image| ilist << image }
  ilist.set_current current
  ilist
end
compact!() click to toggle source
# File lib/rmagick_internal.rb, line 1449
def compact!
  current = get_current
  a = @images.compact! # returns nil if no changes were made
  set_current current
  a.nil? ? nil : self
end
concat(other) click to toggle source
# File lib/rmagick_internal.rb, line 1456
def concat(other)
  is_an_image_array other
  other.each { |image| @images << image }
  @scene = length - 1
  self
end
copy() click to toggle source

Make a deep copy

# File lib/rmagick_internal.rb, line 1418
def copy
  ditto = self.class.new
  @images.each { |f| ditto << f.copy }
  ditto.scene = @scene
  ditto.taint if tainted?
  ditto
end
cur_image() click to toggle source

Return the current image

# File lib/rmagick_internal.rb, line 1427
def cur_image
  Kernel.raise IndexError, 'no images in this list' unless @scene
  @images[@scene]
end
delay=(d) click to toggle source

Set same delay for all images

# File lib/rmagick_internal.rb, line 1464
def delay=(d)
  raise ArgumentError, 'delay must be greater than or equal to 0' if Integer(d) < 0

  @images.each { |f| f.delay = Integer(d) }
end
delete(obj, &block) click to toggle source
# File lib/rmagick_internal.rb, line 1470
def delete(obj, &block)
  is_an_image obj
  current = get_current
  a = @images.delete(obj, &block)
  set_current current
  a
end
delete_at(ndx) click to toggle source
# File lib/rmagick_internal.rb, line 1478
def delete_at(ndx)
  current = get_current
  a = @images.delete_at(ndx)
  set_current current
  a
end
delete_if(&block) click to toggle source
# File lib/rmagick_internal.rb, line 1485
def delete_if(&block)
  current = get_current
  @images.delete_if(&block)
  set_current current
  self
end
dup() click to toggle source
# File lib/rmagick_internal.rb, line 1492
def dup
  ditto = self.class.new
  @images.each { |img| ditto << img }
  ditto.scene = @scene
  ditto.taint if tainted?
  ditto
end
eql?(other) click to toggle source
# File lib/rmagick_internal.rb, line 1500
def eql?(other)
  is_an_image_array other
  eql = other.eql?(@images)
  begin # "other" is another ImageList
    eql &&= @scene == other.scene
  rescue NoMethodError
    # "other" is a plain Array
  end
  eql
end
fill(*args, &block) click to toggle source
# File lib/rmagick_internal.rb, line 1511
def fill(*args, &block)
  is_an_image args[0] unless block_given?
  current = get_current
  @images.fill(*args, &block)
  is_an_image_array self
  set_current current
  self
end
find_all(&block) click to toggle source

Override Enumerable's #find_all

# File lib/rmagick_internal.rb, line 1521
def find_all(&block)
  current = get_current
  a = @images.find_all(&block)
  ilist = self.class.new
  a.each { |image| ilist << image }
  ilist.set_current current
  ilist
end
Also aliased as: select
from_blob(*blobs, &block) click to toggle source
# File lib/rmagick_internal.rb, line 1531
def from_blob(*blobs, &block)
  Kernel.raise ArgumentError, 'no blobs given' if blobs.length.zero?
  blobs.each do |b|
    Magick::Image.from_blob(b, &block).each { |n| @images << n }
  end
  @scene = length - 1
  self
end
indexes(*args)
Alias for: values_at
indices(*args)
Alias for: values_at
insert(index, *args) click to toggle source
# File lib/rmagick_internal.rb, line 1553
def insert(index, *args)
  args.each { |image| is_an_image image }
  current = get_current
  @images.insert(index, *args)
  set_current current
  self
end
inspect() click to toggle source

Call inspect for all the images

# File lib/rmagick_internal.rb, line 1562
def inspect
  img = []
  @images.each { |image| img << image.inspect }
  img = '[' + img.join(",\n") + "]\nscene=#{@scene}"
end
iterations=(n) click to toggle source

Set the number of iterations of an animated GIF

# File lib/rmagick_internal.rb, line 1569
def iterations=(n)
  n = Integer(n)
  Kernel.raise ArgumentError, 'iterations must be between 0 and 65535' if n < 0 || n > 65_535
  @images.each { |f| f.iterations = n }
  self
end
last(*args) click to toggle source
# File lib/rmagick_internal.rb, line 1576
def last(*args)
  if args.length.zero?
    a = @images.last
  else
    a = @images.last(*args)
    ilist = self.class.new
    a.each { |img| ilist << img }
    @scene = a.length - 1
    a = ilist
  end
  a
end
map!(&block)
Alias for: collect!
marshal_dump() click to toggle source

Custom marshal/unmarshal for Ruby 1.8.

# File lib/rmagick_internal.rb, line 1590
def marshal_dump
  ary = [@scene]
  @images.each { |i| ary << Marshal.dump(i) }
  ary
end
marshal_load(ary) click to toggle source
# File lib/rmagick_internal.rb, line 1596
def marshal_load(ary)
  @scene = ary.shift
  @images = []
  ary.each { |a| @images << Marshal.load(a) }
end
method_missing(meth_id, *args, &block) click to toggle source

The ImageList class supports the Magick::Image class methods by simply sending the method to the current image. If the method isn't explicitly supported, send it to the current image in the array. If there are no images, send it up the line. Catch a NameError and emit a useful message.

Calls superclass method
# File lib/rmagick_internal.rb, line 1606
def method_missing(meth_id, *args, &block)
  if @scene
    @images[@scene].send(meth_id, *args, &block)
  else
    super
  end
rescue NoMethodError
  Kernel.raise NoMethodError, "undefined method `#{meth_id.id2name}' for #{self.class}"
rescue Exception
  $ERROR_POSITION.delete_if { |s| /:in `send'$/.match(s) || /:in `method_missing'$/.match(s) }
  Kernel.raise
end
new_image(cols, rows, *fill, &info_blk) click to toggle source

Create a new image and add it to the end

# File lib/rmagick_internal.rb, line 1620
def new_image(cols, rows, *fill, &info_blk)
  self << Magick::Image.new(cols, rows, *fill, &info_blk)
end
partition(&block) click to toggle source
# File lib/rmagick_internal.rb, line 1624
def partition(&block)
  a = @images.partition(&block)
  t = self.class.new
  a[0].each { |img| t << img }
  t.set_current nil
  f = self.class.new
  a[1].each { |img| f << img }
  f.set_current nil
  [t, f]
end
ping(*files, &block) click to toggle source

Ping files and concatenate the new images

# File lib/rmagick_internal.rb, line 1636
def ping(*files, &block)
  Kernel.raise ArgumentError, 'no files given' if files.length.zero?
  files.each do |f|
    Magick::Image.ping(f, &block).each { |n| @images << n }
  end
  @scene = length - 1
  self
end
pop() click to toggle source
# File lib/rmagick_internal.rb, line 1645
def pop
  current = get_current
  a = @images.pop # can return nil
  set_current current
  a
end
push(*objs) click to toggle source
# File lib/rmagick_internal.rb, line 1652
def push(*objs)
  objs.each do |image|
    is_an_image image
    @images << image
  end
  @scene = length - 1
  self
end
read(*files, &block) click to toggle source

Read files and concatenate the new images

# File lib/rmagick_internal.rb, line 1662
def read(*files, &block)
  Kernel.raise ArgumentError, 'no files given' if files.length.zero?
  files.each do |f|
    Magick::Image.read(f, &block).each { |n| @images << n }
  end
  @scene = length - 1
  self
end
reject(&block) click to toggle source

override Enumerable's reject

# File lib/rmagick_internal.rb, line 1672
def reject(&block)
  current = get_current
  ilist = self.class.new
  a = @images.reject(&block)
  a.each { |image| ilist << image }
  ilist.set_current current
  ilist
end
reject!(&block) click to toggle source
# File lib/rmagick_internal.rb, line 1681
def reject!(&block)
  current = get_current
  a = @images.reject!(&block)
  @images = a unless a.nil?
  set_current current
  a.nil? ? nil : self
end
replace(other) click to toggle source
# File lib/rmagick_internal.rb, line 1689
def replace(other)
  is_an_image_array other
  current = get_current
  @images.clear
  other.each { |image| @images << image }
  @scene = length.zero? ? nil : 0
  set_current current
  self
end
respond_to?(meth_id, priv = false) click to toggle source
Calls superclass method
# File lib/rmagick_internal.rb, line 1701
def respond_to?(meth_id, priv = false)
  return true if __respond_to__?(meth_id, priv)

  if @scene
    @images[@scene].respond_to?(meth_id, priv)
  else
    super
  end
end
Also aliased as: __respond_to__?
reverse() click to toggle source
# File lib/rmagick_internal.rb, line 1711
def reverse
  current = get_current
  a = self.class.new
  @images.reverse_each { |image| a << image }
  a.set_current current
  a
end
reverse!() click to toggle source
# File lib/rmagick_internal.rb, line 1719
def reverse!
  current = get_current
  @images.reverse!
  set_current current
  self
end
reverse_each() { |image| ... } click to toggle source
# File lib/rmagick_internal.rb, line 1726
def reverse_each
  @images.reverse_each { |image| yield(image) }
  self
end
scene=(n) click to toggle source

Allow scene to be set to nil

# File lib/rmagick_internal.rb, line 1281
def scene=(n)
  if n.nil?
    Kernel.raise IndexError, 'scene number out of bounds' unless @images.length.zero?
    @scene = nil
    return @scene
  elsif @images.length.zero?
    Kernel.raise IndexError, 'scene number out of bounds'
  end

  n = Integer(n)
  Kernel.raise IndexError, 'scene number out of bounds' if n < 0 || n > length - 1
  @scene = n
  @scene
end
select(&block)
Alias for: find_all
shift() click to toggle source
# File lib/rmagick_internal.rb, line 1731
def shift
  current = get_current
  a = @images.shift
  set_current current
  a
end
slice(*args) click to toggle source
# File lib/rmagick_internal.rb, line 1738
def slice(*args)
  slice = @images.slice(*args)
  if slice
    ilist = self.class.new
    if slice.respond_to?(:each)
      slice.each { |image| ilist << image }
    else
      ilist << slice
    end
  else
    ilist = nil
  end
  ilist
end
slice!(*args) click to toggle source
# File lib/rmagick_internal.rb, line 1753
def slice!(*args)
  current = get_current
  a = @images.slice!(*args)
  set_current current
  a
end
ticks_per_second=(t) click to toggle source
# File lib/rmagick_internal.rb, line 1760
def ticks_per_second=(t)
  Kernel.raise ArgumentError, 'ticks_per_second must be greater than or equal to 0' if Integer(t) < 0
  @images.each { |f| f.ticks_per_second = Integer(t) }
end
to_a() click to toggle source
# File lib/rmagick_internal.rb, line 1765
def to_a
  a = []
  @images.each { |image| a << image }
  a
end
uniq() click to toggle source
# File lib/rmagick_internal.rb, line 1771
def uniq
  current = get_current
  a = self.class.new
  @images.uniq.each { |image| a << image }
  a.set_current current
  a
end
uniq!(*_args) click to toggle source
# File lib/rmagick_internal.rb, line 1779
def uniq!(*_args)
  current = get_current
  a = @images.uniq!
  set_current current
  a.nil? ? nil : self
end
unshift(obj) click to toggle source

@scene -> new object

# File lib/rmagick_internal.rb, line 1787
def unshift(obj)
  is_an_image obj
  @images.unshift(obj)
  @scene = 0
  self
end
values_at(*args) click to toggle source
# File lib/rmagick_internal.rb, line 1794
def values_at(*args)
  a = @images.values_at(*args)
  a = self.class.new
  @images.values_at(*args).each { |image| a << image }
  a.scene = a.length - 1
  a
end
Also aliased as: indexes, indices

Protected Instance Methods

is_an_image(obj) click to toggle source
# File lib/rmagick_internal.rb, line 1244
def is_an_image(obj)
  Kernel.raise ArgumentError, "Magick::Image required (#{obj.class} given)" unless obj.is_a? Magick::Image
  true
end
is_an_image_array(ary) click to toggle source

Ensure array is always an array of Magick::Image objects

# File lib/rmagick_internal.rb, line 1250
def is_an_image_array(ary)
  Kernel.raise ArgumentError, "Magick::ImageList or array of Magick::Images required (#{ary.class} given)" unless ary.respond_to? :each
  ary.each { |obj| is_an_image obj }
  true
end
set_current(current) click to toggle source

Find old current image, update scene number current is the id of the old current image.

# File lib/rmagick_internal.rb, line 1258
def set_current(current)
  if length.zero?
    self.scene = nil
    return
  # Don't bother looking for current image
  elsif scene.nil? || scene >= length
    self.scene = length - 1
    return
  elsif !current.nil?
    # Find last instance of "current" in the list.
    # If "current" isn't in the list, set current to last image.
    self.scene = length - 1
    each_with_index do |f, i|
      self.scene = i if f.__id__ == current
    end
    return
  end
  self.scene = length - 1
end

Private Instance Methods

get_current() click to toggle source
# File lib/rmagick_internal.rb, line 1236
def get_current
  @images[@scene].__id__
rescue StandardError
  nil
end