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Contents
# In an Imageable, you either need to define method
# image path, *args
# for an unchanging image
# or
# sequenced_image path, width, height, frequency = 10, &block
# for a sprite sequence.
# Or override
# method image
# or set an image dynamically.
#
module Imageable extend Trait
class ImageMissingError < RuntimeError
def initialize
super <<-MESSAGE
In an Imageable, you either need to define method
image path, *args
for an unchanging image
or
sequenced_image path, width, height, frequency = 10, &block
for a sprite sequence.
Or override
method image
or set an image dynamically.
MESSAGE
end
end
def self.included klass
klass.extend ClassMethods
end
def initialize *args
super *args
end
attr_writer :image
def image
@image || raise(ImageMissingError.new)
end
# Set this thing's image using a path.
#
def image_from path, *args
self.image = Gosu::Image.new self.window, File.join(Resources.root, path), *args
end
# Set this thing's image in the form of a sequenced image.
#
def sequenced_image_from path, width, height, frequency = 10, &block
@image_sequence_started = Time.now
self.image = Gosu::Image::load_tiles self.window, File.join(Resources.root, path), width, height, false
end
module ClassMethods
def image path, *args
InitializerHooks.register self do
image_from path, *args
end
end
def sequenced_image path, width, height, frequency = 10, &block
InitializerHooks.register self do
sequenced_image_from path, width, height, frequency, &block
end
# divider = 1000 / frequency
# Override image.
#
define_method :image do
@image[(block ? block : lambda { (Time.now - @image_sequence_started)*frequency % @image.size })[]]
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems