@thi.ng/grid-iterators
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    2.0.3 • Public • Published

    grid-iterators

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    This project is part of the @thi.ng/umbrella monorepo.

    About

    2D grid iterators w/ multiple orderings.

    Provides the 15 following orderings to generate grid coordinates and additional iterators for shape rasterization:

    Columns

    anim

    Source

    Also see the filtered version columnEnds2d(), which only includes the end points of each column.

    Diagonal

    anim

    Source

    Also see the filtered version diagonalEnds2d(), which only includes the end points of the diagonals.

    Hilbert curve

    anim

    Source

    Interleave columns

    anim

    Source

    Supports custom strides... example uses step = 4

    Interleave rows

    anim

    Source

    Supports custom strides... example uses step = 4

    Random

    anim

    Source

    Supports custom PRNG implementations via IRandom interface defined in @thi.ng/random

    Rows

    anim

    Source

    Also see the filtered version rowEnds2d(), which only includes the end points of each row.

    Outward spiral

    anim

    Source

    Z-curve

    anim

    Source

    Zigzag columns

    anim

    Source

    Zigzag diagonal

    anim

    Source

    Zigzag rows

    anim

    Source

    Some functions have been ported from Christopher Kulla's Java-based Sunflow renderer.

    For more basic 2D/3D grid iteration, also see range2d() & range3d() in @thi.ng/transducers.

    Miscellaneous

    Additionally, the following shape iterators are available:

    Status

    STABLE - used in production

    Search or submit any issues for this package

    Related packages

    • @thi.ng/morton - Z-order curve / Morton encoding, decoding & range extraction for arbitrary dimensions
    • @thi.ng/transducers - Lightweight transducer implementations for ES6 / TypeScript

    Installation

    yarn add @thi.ng/grid-iterators

    ES module import:

    <script type="module" src="https://cdn.skypack.dev/@thi.ng/grid-iterators"></script>

    Skypack documentation

    For Node.js REPL:

    # with flag only for < v16
    node --experimental-repl-await
    
    > const gridIterators = await import("@thi.ng/grid-iterators");
    

    Package sizes (gzipped, pre-treeshake): ESM: 1.50 KB

    Dependencies

    Usage examples

    Several demos in this repo's /examples directory are using this package.

    A selection:

    Screenshot Description Live demo Source
    Visualization of different grid iterator strategies Demo Source

    API

    Generated API docs

    import * as gi from "@thi.ng/grid-iterators";
    
    [...gi.zigzagRows2d(4, 4)]
    
    // [
    //   [ 0, 0 ], [ 1, 0 ], [ 2, 0 ], [ 3, 0 ],
    //   [ 3, 1 ], [ 2, 1 ], [ 1, 1 ], [ 0, 1 ],
    //   [ 0, 2 ], [ 1, 2 ], [ 2, 2 ], [ 3, 2 ],
    //   [ 3, 3 ], [ 2, 3 ], [ 1, 3 ], [ 0, 3 ]
    // ]

    Authors

    Karsten Schmidt

    If this project contributes to an academic publication, please cite it as:

    @misc{thing-grid-iterators,
      title = "@thi.ng/grid-iterators",
      author = "Karsten Schmidt",
      note = "https://thi.ng/grid-iterators",
      year = 2019
    }

    License

    © 2019 - 2021 Karsten Schmidt // Apache Software License 2.0

    Install

    npm i @thi.ng/grid-iterators

    DownloadsWeekly Downloads

    48

    Version

    2.0.3

    License

    Apache-2.0

    Unpacked Size

    50.5 kB

    Total Files

    42

    Last publish

    Collaborators

    • thi.ng