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less-sprites

Node.js sprites generator for LESS

node.js sprites generator for LESS

less-sprites uses ImageMagick, so install it first.

npm install less-sprites

Write a list of source images into a .json file: { "files": ["icon1.png", "icon2.png"] }

Create the sprite:

less-sprites my-sprite.json

There are more options you can specify:

{
// Direction of image placement, default "bottom"
"direction": "right|bottom",
// Directory relative to the .json file where source files are located
"dir": "icons-sprite",
// List of source images (without directory) or "*" to use all PNG files
"files": ["icon1.png", "icon2.png"],
// Location and name of the final sprite, default is same as the .json file.
"sprite": "icons-sprite.png",
// The http path to the image (default: /images)
"httpPath": '/images',
// Space between the images in the sprite, default 0
"spacing": 50,
// Enable retina support, place all retina images in the same directory name with 2x at the end, eg.: icons-sprite2x
"retina": true,
// Location and name of the final LESS file, default is same as the .json file.
"less": "../less/icon-sprite.less"
}

less-sprites my-sprite.json creates two files:

  • my-sprite.png - the final sprite image
  • my-sprite.less - positions of the images inside the sprite

In your stylesheet you target the original image, not the sprite; it will be translated during compilation.

.icon-first {
background: url('/images/icons_sprite/icon1.png');
}
.icon-second {
background: url('/images/icons_sprite/icon2.png');
}
@import "icons/icons-sprite.less"
 
.icon-first {
.sprite('icon1.png');
}
 
// enabled auto dimensions 
.icon-second {
.sprite('icon2.png', true);
}

which is later compiled into final CSS:

.icon-first {
background: url("/images/icons-sprite.png") 0px 0px;
background-repeat: no-repeat;
background-position: 0px 0px;
}
.icon-second {
height: 118px;
width: 69px;
background-repeat: no-repeat;
background: url("/images/icons-sprite.png") 0px -20px;
}
 

Now when you need to add a new image to the sprite, you simply it to the .json file and call less-sprites. No extra work is needed in your stylesheets.

@import "icons/icons-sprite.less"
 
.icon-first {
.sprite('icon1.png');
}
 
// enabled auto dimensions 
.icon-second {
.sprite('icon2.png', true);
}

which is later compiled into final CSS:

.icon-first {
background: url("/images/icons-sprite.png") 0px 0px;
background-repeat: no-repeat;
background-position: 0px 0px;
}
.icon-second {
height: 118px;
width: 69px;
background-repeat: no-repeat;
background: url("/images/icons-sprite.png") 0px -20px;
}
@media (-webkit-min-device-pixel-ratio: 1.5), (min--moz-device-pixel-ratio: 1.5), (-o-min-device-pixel-ratio: 3/2), (min-device-pixel-ratio: 1.5) {
.icon-first {
background-image: url("/images/sprite-specs2x.png");
background-position: 0px 0px;
background-size: 270px auto;
}
}
 

If you @import several sprites into global namespace there is a possibility of name conflict (imagine referencing two images from two different places as ../image.png). The best way to avoid this is to always import inside a scope:

.my-icons {
@import "...";
.icon-first {
.sprite('...');
}
}

The MIT License.