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

• About
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  • Diagonal
  • Hilbert curve
  • Interleave columns
  • Interleave rows
  • Random
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  • Outward spiral
  • Z-curve
  • Zigzag columns
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2D grid iterators w/ multiple orderings.

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

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

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

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Supports custom strides... example uses step = 4

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Supports custom strides... example uses step = 4

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

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

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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.

Additionally, the following shape iterators are available:

• circle (Bresenham)
• hline
• vline
• line (Bresenham)

STABLE - used in production

Search or submit any issues for this package

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

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

• @thi.ng/arrays
• @thi.ng/binary
• @thi.ng/morton
• @thi.ng/random
• @thi.ng/transducers

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

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 ]
// ]

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
}

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