● Covered by 1 source · 1 reportLow impact1 neutral
The Qlobe: A Ruby Quine That Rotates Its Output 45 Degrees Per Execution
Key points
- The Qlobe is a Ruby quine that self-replicates.
- It rotates a textual globe in its output by 45 degrees per run.
- Users can specify a custom rotation angle via command-line argument.
- The quine uses Zlib for data compression and manipulation.
Introducing The Qlobe
Yusuke Endoh, known for creating specialized quines, developed "The Qlobe" for RubyConf. This quine is designed to be a "global" quine, meaning it is not specific to a particular language or locale beyond its Ruby implementation.
Rotational Output Mechanism
The Qlobe's primary feature is its ability to rotate a textual representation of a globe within its output. Each execution of the quine advances the globe's rotation by 45 degrees. This means that after eight executions, the globe will return to its original orientation.
The rotation angle is controlled by an internal variable, 'v', which is updated with each run. Users can override the default 45-degree rotation by providing an integer as a command-line argument, allowing for custom rotation increments.
Technical Implementation
The quine's code includes mechanisms for self-replication and the globe rendering. It utilizes Ruby's `eval` function to execute its own source code. Data compression and manipulation are handled using the `zlib` library, which is required for the quine's operation. The visual globe is constructed using character mapping and mathematical calculations to project a 3D shape onto a 2D text output.
Significance in Quine Development
The Qlobe demonstrates a creative application of quine principles by incorporating dynamic visual output. While quines are primarily self-replicating programs, this example adds an interactive and visually changing element to the concept, showcasing advanced programming techniques within the constraints of a quine.
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Reporting from
Yusuke Endoh created "The Qlobe," a Ruby quine that outputs its own source code while rotating a textual globe by 45 degrees with each execution. This quine can also accept a command-line argument to specify a custom rotation angle.