GeoPattern

This is an Elixir port of the Ruby GeoPattern library by Jason Long. It converts strings into beautiful SVG patterns that can be used as the background-image of containers. See example patterns generated by the Ruby library in Github Guides, and view the Javascript port in action in the live preview tool by Brandon Mills. In this port, 16 different patterns are available, and the pattern and the background color are configurable.

Installation

Add geo_pattern to your list of dependencies in mix.exs:

def deps do
  [{:geo_pattern, "~> 0.0.1"}]
end

Usage Instructions

Use GeoPattern.generate/1 to get a complete NodeCollection. If you want a string, pass the result to to_string/1.

iex> GeoPattern.generate("Hello, world")
%GeoPattern.SVG.NodeCollection{
  nodes: [
    %GeoPattern.SVG.Node{attrs: [xmlns: "http://www.w3.org/2000[204/1987]
      width: 227.10000000000002, height: 393.34873839889207], closing: false,
      name: "svg", self_closing: false},
    %GeoPattern.SVG.Node{attrs: [fill: "#843C90", x: 0, y: 0, width: "100%",
      height: "100%"], closing: false, name: "rect", self_closing: true},
    ..
  ]
}

iex> GeoPattern.generate("Hello, world") |> to_string
"<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"227.10000000000002\" height=\"393.34873839889207\"><rect fill=\"#843C90\" x=\"0\" y=\"0\" width=\"100%\" height=\"100%\" /><polyline fill=\"#DDD\" fill-opacity=\"0.1\" stroke=\"#000\" stroke-opacity=\"0.02\" transform=\"translate(-37.85,0.0) rotate(180,37.85,32.779061533241006)\" points=\"37.85,0,75.7,65.55812306648201,0,65.55812306648201,37.85,0\" /><polyline fill=\"#DDD\" fill-opacity=\"0.1\" stroke=\"#000\" stroke-opacity=\"0.02\" transform=\"translate(189.25,0.0) rotate(180,37.85,32.779061533241006)\" points=\"37.85,0,75.7,65.55812306648201,0,65.55812306648201,37.85,0\" />.."

To write a pattern to a file, use GeoPattern.generate_to_file/2.

iex> GeoPattern.generate_to_file("patterns!", "my-pattern.svg")
:ok

You can specify :color and :pattern options in GeoPattern.generate/2 and GeoPattern.generate_to_file/3. The :color option sets the background color.

iex> GeoPattern.generate("dragons", color: "#445588")
%GeoPattern.SVG.NodeCollection{..}

iex> GeoPattern.generate_to_file("fairies", "background.svg", pattern: :concentric_circles)
:ok

Available Patterns

• :chevrons
• :concentric_circles
• :diamonds
• :hexagons
• :mosaic_squares
• :nested_squares
• :octagons
• :overlapping_circles
• :overlapping_rings
• :plaid
• :plus_signs
• :sine_waves
• :squares
• :tessellation
• :triangles
• :xes

View full documentation here.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/annejohnson/geo_pattern. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

Get started by cloning the repository, running mix deps.get, and running the test suite with mix espec.