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add Polygon.from static method #111

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add Polygon.from static method #111

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6 changes: 6 additions & 0 deletions src/polygon.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -135,6 +135,12 @@ export class Polygon implements GeoShape {
return new Polygon(...points);
}

/** Creates a polygon from a shape. */
static from(shape: GeoShape, resolution = 60): Polygon {
const points = tabulate((i) => shape.at(i / resolution), resolution);
return new Polygon(...points);
}

/** Interpolates the points of two polygons */
static interpolate(p1: Polygon, p2: Polygon, t = 0.5) {
// TODO support interpolating polygons with different numbers of points
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10 changes: 9 additions & 1 deletion test/polygon-test.ts
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Expand Up @@ -5,7 +5,7 @@


import tape from 'tape';
import {Line, Point, Polygon, Polyline} from '../src';
import {Circle, Line, Point, Polygon, Polyline} from '../src';


const poly = (...p: number[][]) => new Polygon(...p.map(q => new Point(q[0], q[1])));
Expand Down Expand Up @@ -52,3 +52,11 @@ tape('Cutting', (test) => {

test.end();
});

tape('From', (test) => {
const circle = new Circle(new Point(0, 0), 1);
const p = points(Polygon.from(circle, 4));
test.deepEqual(p, [[1, 0], [6.123233995736766e-17, 1], [-1, 1.2246467991473532e-16], [-1.8369701987210297e-16, -1]]);

test.end();
})