gridgy-presets

This contains some premade instances and creators for the Tesselation and Grid classes from gridgy.

Demo

Install

With npm installed, run

npm install gridgy-presets

UMD builds made with rollup are available in the dist directory.

Example

The example on the gridgy readme shows a simple case of using gridgy-presets. A more complete example is the demo and its JS source.

Here is another example that covers the tesselation override feature:

import {Tesselation} from "gridgy";
import {tessHexagonV, hexagonVCubic} from "gridgy-presets";
 
// A grid of square cells where every other row is offset by the width of half
// a cell. Topologically equivalent to tessHexagonV.
const tessHexagonVSquareCells = new Tesselation({
  periodMatrix: [1, 0, 0.5, 1],
  faceVerticesTable: tessHexagonV.getProps().faceVerticesTable,
  vertexCoordinatesTable: {
    "0": [0, 0],
    "1": [0, 1],
  },
});
 
const grid = hexagonVCubic({
  width: 3,
  heightTL: 3,
  heightBL: 3,
  tesselation: tessHexagonVSquareCells,
  origin: [50, 10],
  scale: 20,
});
 
// followed by use of the grid instance

API

gridgy-presets exports two categories of things: premade Tesselation instances, and functions creating Grid instances of a certain shape given a few dimensions. All of these exports are viewable in the demo. This API documentation mostly concerns itself with the features the demo does not cover.

The exported tesselations are

• tessSquare
• tessOctagon
• tessSnubSquare
• tessCairo
• tessTriangleH
• tessTriangleV
• tessHexagonH
• tessHexagonV

These are premade instances, not functions. As the example above demonstrates, gridgy makes it easy to create altered tesselation instances based on these in case that is what you need.

The exported Grid-creating functions, which map one-to-one with the items in the main dropdown on the demo page, are

• square (uses tessSquare)
• octagon (uses tessOctagon)
• snubSquare (uses tessSnubSquare)
• cairo (uses tessCairo)
• triangleH (uses tessTriangleH)
• triangleHDown (uses tessTriangleH)
• triangleHUp (uses tessTriangleH)
• triangleV (uses tessTriangleV)
• triangleVLeft (uses tessTriangleV)
• triangleVRight (uses tessTriangleV)
• hexagonH (uses tessHexagonH)
• hexagonHCubic (uses tessHexagonH)
• hexagonV (uses tessHexagonV)
• hexagonVCubic (uses tessHexagonV)

You can see the code used to construct the appropriate Grid instance at the bottom left of the demo page. The demo page shows the keys used to specify the dimensions of the grid (which depends on what grid shape is being used), the origin key, and the scale key.

In addition to the dimensions, origin, and scale, there are many other keys supported on all of these functions, many of which come directly from the Grid constructor provided by gridgy. The full list of keys is:

• <dimension>: The only required key(s). A required integer giving a size for one of the grid's dimensions. For example, width and height are required for square, and only length is required for triangleHDown. Please refer to the demo to see what dimensions are required for each grid.
• tesselation: Used to override the default tesselation that this function uses. You need to make sure the Tesselation you provide mimics the structure of the default one, or things will go haywire.
• exclude: An array of faces not to include in the grid, even if they would be included by default. Specify these in your custom key format, if any.
• include: An array of extra faces to add to the grid. This takes precedence over exclude. Specify these in your custom key format, if any.
• origin: Same as the origin property on the Grid constructor.
• scale: Same as the scale property on the Grid constructor.
• fromFaceTessKey: Same as the fromFaceTessKey property on the Grid constructor.
• fromEdgeTessKey: Same as the fromEdgeTessKey property on the Grid constructor.
• fromVertexTessKey: Same as the fromVertexTessKey property on the Grid constructor.
• toFaceTessKey: Same as the toFaceTessKey property on the Grid constructor.
• toEdgeTessKey: Same as the toEdgeTessKey property on the Grid constructor.
• toVertexTessKey: Same as the toVertexTessKey property on the Grid constructor.
• elToString: Same as the elToString property on the Grid constructor.

License

MIT