A flat array of vertice coordinates like [x0,y0, x1,y1, x2,y2, ...].
Optional holes: ArrayLike<number>An array of hole indices if any (e.g. [5, 8] for a 12-vertice input would mean one hole with vertices 5–7 and another with 8–11).
Optional dimensions: numberThe number of coordinates per vertice in the input array (2 by default).
A flat array with each group of three numbers indexing a triangle in the vertices array.
earcut([10,0, 0,50, 60,60, 70,10]); // returns [1,0,3, 3,2,1]
with a hole: earcut([0,0, 100,0, 100,100, 0,100, 20,20, 80,20, 80,80, 20,80], [4]); // [3,0,4, 5,4,0, 3,4,7, 5,0,1, 2,3,7, 6,5,1, 2,7,6, 6,1,2]
with 3d coords: earcut([10,0,1, 0,50,2, 60,60,3, 70,10,4], null, 3); // [1,0,3, 3,2,1]
Returns the relative difference between the total area of triangles and the area of the input polygon. 0 means the triangulation is fully correct.
same as earcut
same as earcut
same as earcut
see return value of earcut
const triangles = earcut(vertices, holes, dimensions);
const deviation = earcut.deviation(vertices, holes, dimensions, triangles);
Transforms multi-dimensional array (e.g. GeoJSON Polygon) into the format expected by earcut.
Arrays of rings, with the first being the outline and the rest holes. A ring is an array points, each point being an array of numbers.
Transforming GeoJSON data.
const data = earcut.flatten(geojson.geometry.coordinates);
const triangles = earcut(data.vertices, data.holes, data.dimensions);
Transforming simple triangle with hole:
const data = earcut.flatten([[[0, 0], [100, 0], [0, 100]], [[10, 10], [0, 10], [10, 0]]]);
const triangles = earcut(data.vertices, data.holes, data.dimensions);
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Triangulate an outline.