circule

Circule

Generate an icon of overlapping circles derived from a hash.

• Slice the hash into 16-bit slices starting at bit bn, stepping s bits at a time, ending after bit bn.

• From each slice define a circle such that bits 0 through 4 is the x coordinate of the center, bits 5 through 9 is the y coordinate of the center, and bits 10 through 15 is the radius of the circle.

• Each pixel in the output will be colored based on the number of circles that point is inside.

The demo video shows how the final image is composed.

Installation

Add this line to your application's Gemfile:

gem 'circule'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install circule

Usage

CLI Options

Short Option	Long Option	Description
-h HEXSTRING	--hex	Use this hash
-b INTEGER	--btc-block	Use hash from this bitcoin block
-0 INTEGER	--bit0	Starting bit
-s INTEGER	--step	Step bit
-n INTEGER	--bitn	Starting bit
-c INTEGER	--canvas	Canvas size
-x INTEGER	--ox	Offset x
-y INTEGER	--oy	Offset y
-z INTEGER	--zoom	Zoom in GUI
-f FILENAME	--file	Use hash from file
-s FILENAME	--save	Save image to file
-g	--gui	Run GUI (requires glimmer & tk)
-i	--interactive	Run GUI with pry

CLI Example(s)

The icon for this project on GitLab:

$ echo -n circule | sha256sum
4b9ae43c4e15486ce131f733eff14547764623d27aa5d1d9aff45b67528f0b60  -

$ circule -h 4b9ae43c4e15486ce131f733eff14547764623d27aa5d1d9aff45b67528f0b60 -s /tmp/circule.png

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitLab at https://gitlab.com/fjc/circule.

License

The gem is available as open source under the terms of the MIT License.