horizontal sprite layout

lib/compass/sass_extensions/sprites.rb

@@ -9,6 +9,7 @@ module Compass
 end
 
 require 'compass/sass_extensions/sprites/image'
+require 'compass/sass_extensions/sprites/layout_methods'
 require 'compass/sass_extensions/sprites/sprite_methods'
 require 'compass/sass_extensions/sprites/image_methods'
 require 'compass/sass_extensions/sprites/sprite_map'

lib/compass/sass_extensions/sprites/layout_methods.rb

@@ -0,0 +1,85 @@
+module Compass
+  module SassExtensions
+    module Sprites
+      module LayoutMethods
+        HORIZONTAL = 'horizontal'
+        
+        def horizontal?
+          @kwargs.get_var('layout').value == HORIZONTAL
+        end
+        
+        # Calculates the overal image dimensions
+        # collects image sizes and input parameters for each sprite
+        def compute_image_positions!
+          if horizontal?
+            calculate_height
+            calculate_horizontal_positions
+            calculate_width
+          else
+            calculate_width
+            calulate_vertical_postions
+            calculate_height
+          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.offset, last_image.offset].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
+            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 calculate_dimensions!
+          calculate_width
+          calculate_height
+        end
+        
+        def calculate_height
+          @height = if horizontal?
+            height_for_horizontal_layout
+          else
+            height_for_vertical_layout
+          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.spacing}.max
+        end
+        
+        def calculate_width
+          @width = if horizontal?
+            width_for_horizontal_layout
+          else
+            width_for_vertical_layout
+          end
+        end
+        
+        def width_for_horizontal_layout
+          @images.inject(0) { |sum, image| sum += (image.width + image.offset) }
+        end
+        
+        def width_for_vertical_layout
+          @images.map { |image| image.width + image.offset }.max
+        end
+      end
+    end
+  end
+end
+  

lib/compass/sass_extensions/sprites/sprite_map.rb

@@ -7,6 +7,7 @@ module Compass
 
         include SpriteMethods
         include ImageMethods
+        include LayoutMethods
 
 
         # Initialize a new sprite object from a relative file path
@@ -27,6 +28,7 @@ module Compass
           @name = name
           @kwargs = kwargs
           @kwargs['cleanup'] ||= Sass::Script::Bool.new(true)
+          @kwargs['layout'] ||= Sass::Script::String.new('vertical')
           @images = nil
           @width = nil
           @height = nil

lib/compass/sass_extensions/sprites/sprite_methods.rb

@@ -14,7 +14,6 @@ module Compass
           @width = 0
           init_images
           compute_image_positions!
-          @height = @images.last.top + @images.last.height
           init_engine
         end
         
@@ -29,22 +28,10 @@ module Compass
         def init_images
           @images = image_names.collect do |relative_file|
             image = Compass::SassExtensions::Sprites::Image.new(self, relative_file, kwargs)
-            @width = [ @width, image.width + image.offset ].max
             image
           end
         end
         
-        # Calculates the overal image dimensions
-        # collects image sizes and input parameters for each sprite
-        def compute_image_positions!
-          @images.each_with_index do |image, index|
-            image.left = image.position.unit_str == "%" ? (@width - image.width) * (image.position.value / 100.0) : image.position.value
-            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
-        
         # Validates that the sprite_names are valid sass
         def validate!
           for sprite_name in sprite_names