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Contents
##
# Provides a clean and simple API to generate thumbnails using
# FreeImage as the underlying mechanism.
#
# For more information or if you have build issues with FreeImage, see
# http://seattlerb.rubyforge.org/ImageScience.html
class ImageScience
##
# The top-level image loader opens +path+ and then yields the image.
def self.with_image(path) # :yields: image
end
##
# The top-level image loader, opens an image from the string +data+ and then yields the image.
def self.with_image_from_memory(data) # :yields: image
end
##
# Crops an image to +left+, +top+, +right+, and +bottom+ and then
# yields the new image.
def with_crop(left, top, right, bottom) # :yields: image
end
##
# Returns the width of the image, in pixels.
def width; end
##
# Returns the height of the image, in pixels.
def height; end
##
# Saves the image out to +path+. Changing the file extension will
# convert the file type to the appropriate format.
def save(path); end
##
# Resizes the image to +width+ and +height+ using a cubic-bspline
# filter and yields the new image.
def resize(width, height) # :yields: image
end
##
# Creates a proportional thumbnail of the image scaled so its longest
# edge is resized to +size+ and yields the new image.
def thumbnail(size) # :yields: image
w, h = width, height
scale = size.to_f / (w > h ? w : h)
self.resize((w * scale).round, (h * scale).round) do |image|
yield image
end
end
##
# Creates a square thumbnail of the image cropping the longest edge
# to match the shortest edge, resizes to +size+, and yields the new
# image.
def cropped_thumbnail(size) # :yields: image
w, h = width, height
l, t, r, b, half = 0, 0, w, h, (w - h).abs / 2
l, r = half, half + h if w > h
t, b = half, half + w if h > w
with_crop(l, t, r, b) do |img|
img.thumbnail(size) do |thumb|
yield thumb
end
end
end
end
Version data entries
4 entries across 4 versions & 2 rubygems