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module Compass
module SassExtensions
module Sprites
module LayoutMethods
HORIZONTAL = 'horizontal'
DIAGONAL = 'diagonal'
SMART = 'smart'
VERTICAL = 'vertical'
def smart?
layout == SMART
end
def horizontal?
layout == HORIZONTAL
end
def diagonal?
layout == DIAGONAL
end
def vertical?
layout == VERTICAL
end
def layout
@layout ||= @kwargs.get_var('layout').value
end
# Calculates the overal image dimensions
# collects image sizes and input parameters for each sprite
def compute_image_positions!
case layout
when SMART
calculate_smart_positions
when DIAGONAL
calculate_diagonal_dimensions
calculate_diagonal_positions
when HORIZONTAL
@height = height_for_horizontal_layout
calculate_horizontal_positions
@width = width_for_horizontal_layout
else
@images.sort! do |a,b|
if (b.size <=> a.size) === 0
a.name <=> b.name
else
b.size <=> a.size
end
end
@width = width_for_vertical_layout
calulate_vertical_postions
@height = height_for_vertical_layout
if @images.any?(&:repeat_x?)
calculate_repeat_extra_width!
tile_images_that_repeat
end
end
end
def tile_images_that_repeat
@images.map {|img| img if img.repeat_x?}.compact.each do |image|
x = image.left - (image.left / image.width).ceil * image.width
while x < @width do
begin
img = image.dup
img.top = image.top
img.left = x.to_i
@images << img
x += image.width
end
end
end
end
def calculate_repeat_extra_width!
require 'rational' #for ruby 1.8.7
m = @images.inject(1) {|m,img| img.repeat_x? ? m.lcm(img.width) : m}
remainder = @width % m
@width += (m - remainder) unless remainder.zero?
end
def calculate_smart_positions
fitter = ::Compass::SassExtensions::Sprites::RowFitter.new(@images)
current_y = 0
fitter.fit!.each do |row|
current_x = 0
row.images.each_with_index do |image, index|
image.left = current_x
image.top = current_y
current_x += image.width
end
current_y += row.height
end
@width = fitter.width
@height = fitter.height
end
def calculate_diagonal_dimensions
@width = @images.inject(0) {|sum, img| sum + img.width}
@height = @images.inject(0) {|sum, img| sum + img.height}
end
def calculate_diagonal_positions
previous = nil
@images.each_with_index do |image, index|
if previous.nil?
previous = image
image.top = @height - image.height
image.left = 0
next
end
image.top = previous.top - image.height
image.left = previous.left + previous.width
previous = image
end
end
def calculate_horizontal_positions
@images.each_with_index do |image, index|
image.top = image.position.unit_str == '%' ? (@height - image.height) * (image.position.value / 100.0) : image.position.value
next if index == 0
last_image = @images[index-1]
image.left = last_image.left + last_image.width + [image.spacing, last_image.spacing].max
end
end
def calulate_vertical_postions
@images.each_with_index do |image, index|
image.left = (image.position.unit_str == "%" ? (@width - image.width) * (image.position.value / 100.0) : image.position.value).to_i
next if index == 0
last_image = @images[index-1]
image.top = last_image.top + last_image.height + [image.spacing, last_image.spacing].max
end
end
def height_for_vertical_layout
last = @images.last
last.top + last.height
end
def height_for_horizontal_layout
@height = @images.map {|image| image.height + image.offset}.max
end
def width_for_horizontal_layout
@images.inject(0) { |sum, image| sum += (image.width + image.spacing) }
end
def width_for_vertical_layout
@images.map { |image| image.width + image.offset }.max
end
end
end
end
end
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