You have to use the development version of Compass (see rubygems).
Install an alpha version of Compass
For install it, you can uses Bundler to not pollute your global environment. In first place, install bundler:
$ [sudo] gem install bundler
Now, put in your Compass project a file named Gemfile
with the following content:
source "https://rubygems.org"
gem "compass", "~> 0.13.alpha"
Initialize the Bundler project locally:
$ cd my_project/
$ bundle install --path .vendors/bundler
You can use the command bundle exec compass
instead of compass
for used that specific version of Compass.
Use the repeat-y
option of the sprite engine
Automatic sprites
If you use the basic import, you have to declare the variable $<map>-<sprite>-repeat: repeat-y
before the import:
@import "compass/utilities/sprites";
$icons-layout: horizontal;
$icons-foobar-repeat: repeat-y;
@import "icons/*.png";
@include all-icons-sprites;
In this example, the image named icons/foobar.png
will be repeated vertically.
Note that this featured only works with a horizontal
layout.
Manual sprites
The syntax to declare a repeat-y
for a sprite is $<map>-<sprite>-repeat: repeat-y
. Again, only the horizontal arrangement will be viable:
@import "compass/utilities/sprites";
$icons: sprite-map("icons/*.png",
$icons-layout: horizontal,
$icons-foobar-repeat: repeat-y);
.icons {
background: transparent $icons no-repeat;
}