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 1592
def initialize(*filenames, &block)
  @images = []
  @scene = nil
  filenames.each do |f|
    Magick::Image.read(f, &block).each { |n| @images << n }
  end

  @scene = length - 1 if length > 0 # last image in array
end

Public Instance Methods

*(other) click to toggle source
# File lib/rmagick_internal.rb, line 1369
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 1378
def <<(obj)
  assert_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 1390
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 1407
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 1417
def []=(*args)
  obj = @images.[]=(*args)
  if obj && obj.respond_to?(:each)
    assert_image_array(obj)
    set_current obj.last.__id__
  elsif obj
    assert_image(obj)
    set_current obj.__id__
  else
    set_current nil
  end
end
__map__(&block)
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 1442
def clear
  @scene = nil
  @images.clear
end
clone() click to toggle source
# File lib/rmagick_internal.rb, line 1447
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 1454
def collect(&block)
  current = get_current
  a = @images.map(&block)
  ilist = self.class.new
  a.each { |image| ilist << image }
  ilist.set_current current
  ilist
end
Also aliased as: map, __map__
collect!(&block) click to toggle source
# File lib/rmagick_internal.rb, line 1463
def collect!(&block)
  @images.map!(&block)
  assert_image_array @images
  self
end
Also aliased as: map!, __map__!
compact() click to toggle source
# File lib/rmagick_internal.rb, line 1492
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 1501
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 1508
def concat(other)
  assert_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 1470
def copy
  ditto = self.class.new
  @images.each { |f| ditto << f.copy }
  ditto.scene = @scene
  ditto
end
cur_image() click to toggle source

Return the current image

# File lib/rmagick_internal.rb, line 1478
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 1516
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 1522
def delete(obj, &block)
  assert_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 1530
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 1537
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 1544
def dup
  ditto = self.class.new
  @images.each { |img| ditto << img }
  ditto.scene = @scene
  ditto
end
eql?(other) click to toggle source
# File lib/rmagick_internal.rb, line 1551
def eql?(other)
  assert_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 1562
def fill(*args, &block)
  assert_image args[0] unless block_given?
  current = get_current
  @images.fill(*args, &block)
  assert_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 1572
def find_all(&block)
  current = get_current
  a = @images.select(&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 1582
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 1602
def insert(index, *args)
  args.each { |image| assert_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 1611
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 1618
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 }
end
last(*args) click to toggle source
# File lib/rmagick_internal.rb, line 1624
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)

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

Alias for: collect
map!(&block)
Alias for: collect!
marshal_dump() click to toggle source

Custom marshal/unmarshal for Ruby 1.8.

# File lib/rmagick_internal.rb, line 1638
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 1644
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 1654
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 1668
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 1672
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 1684
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 1693
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 1700
def push(*objs)
  objs.each do |image|
    assert_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 1710
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 1720
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 1729
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 1737
def replace(other)
  assert_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 1749
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 1759
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 1767
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 1774
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 1333
def scene=(n)
  if n.nil?
    Kernel.raise IndexError, 'scene number out of bounds' unless @images.length.zero?
    @scene = nil
    return
  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
end
select(&block)
Alias for: find_all
shift() click to toggle source
# File lib/rmagick_internal.rb, line 1779
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 1786
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 1801
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 1808
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 1813
def to_a
  a = []
  @images.each { |image| a << image }
  a
end
uniq() click to toggle source
# File lib/rmagick_internal.rb, line 1819
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 1827
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 1835
def unshift(obj)
  assert_image obj
  @images.unshift(obj)
  @scene = 0
  self
end
values_at(*args) click to toggle source
# File lib/rmagick_internal.rb, line 1842
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

assert_image(obj) click to toggle source
# File lib/rmagick_internal.rb, line 1298
def assert_image(obj)
  Kernel.raise ArgumentError, "Magick::Image required (#{obj.class} given)" unless obj.is_a? Magick::Image
end
assert_image_array(ary) click to toggle source

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

# File lib/rmagick_internal.rb, line 1303
def assert_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| assert_image obj }
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 1310
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 1290
def get_current
  @images[@scene].__id__
rescue StandardError
  nil
end