This project is largely unmaintained now.

I'll happily accept PRs to keep things in working order, but I no longer plan to make updates.

GeoPattern

Generate beautiful tiling SVG patterns from a string. The string is converted into a SHA and a color and pattern are determined based on the values in the hash. The color is determined by shifting the hue and saturation from a default (or passed in) base color. One of 16 patterns is used (or you can specify one) and the sizing of the pattern elements is also determined by the hash values.

You can use the generated pattern as the background-image for a container. Using the base64 representation of the pattern still results in SVG rendering, so it looks great on retina displays.

See the GitHub Guides site and the Explore section of GitHub are examples of this library in action. Brandon Mills has put together an awesome live preview page that's built on his Javascript port.

Installation

Note: as of version 1.4.0, Ruby version 2 or greater is required.

Add this line to your application's Gemfile:

gem 'geo_pattern'

And then execute:

$ bundle

Or install it yourself as:

$ gem install geo_pattern

Usage

Make a new pattern:

pattern = GeoPattern.generate('Mastering Markdown')

To specify a base background color (with a hue and saturation that adjusts depending on the string):

pattern = GeoPattern.generate('Mastering Markdown', base_color: '#fc0')

To use a specific background color (w/o any hue or saturation adjustments):

pattern = GeoPattern.generate('Mastering Markdown', color: '#fc0')

To use a specific pattern generator:

pattern = GeoPattern.generate('Mastering Markdown', patterns: :sine_waves)

To use a subset of the available patterns:

pattern = GeoPattern.generate('Mastering Markdown', patterns: [:sine_waves, :xes])

Get the SVG string:

puts pattern.to_svg
# => <svg xmlns="http://www.w3.org/2000/svg" ...

Get the Base64 encoded string:

puts pattern.to_base64
# => PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC...

You can then use this string to set the background:

<div style="background-image: <%= pattern.to_data_uri %>"></div>

Available patterns

Note: As of version 1.3.0, string references (e.g. overlapping_circles) are deprecated in favor of symbol references (e.g. :overlapping_circles).

:chevrons

:octagons

:overlapping_circles

:plus_signs

:xes

:sine_waves

:hexagons

:overlapping_rings

:plaid

:triangles

:squares

:nested_squares

:mosaic_squares

:concentric_circles

:diamonds

:tessellation

Inspection of pattern

If you want to get some more information about a pattern, please use the following methods.

pattern = GeoPattern.generate('Mastering Markdown', patterns: [:sine_waves, :xes])

# The color of the background in html notation
pattern.background.color.to_html

# The color of the background in svg notation
pattern.background.color.to_svg


# The input colors
pattern.background.preset.color
pattern.background.preset.base_color

# The generator
pattern.background.generator

To get more information about the structure of the pattern, please use the following methods:

pattern = GeoPattern.generate('Mastering Markdown', patterns: [:sine_waves, :xes])

# The name of the structure
pattern.structure.name

# The generator of the structure
pattern.structure.generator

Rake Support

string = 'Mastering markdown'

require 'geo_pattern/geo_pattern_task'

GeoPattern::GeoPatternTask.new(
  name: 'generate',
  description: 'Generate patterns to make them available as fixtures',
  data: {
    'fixtures/generated_patterns/diamonds_with_color.svg'      => { input: string, patterns: [:diamonds], color: '#00ff00' },
    'fixtures/generated_patterns/diamonds_with_base_color.svg' => { input: string, patterns: [:diamonds], base_color: '#00ff00' }
  }
)