molstar
Version:
A comprehensive macromolecular library.
27 lines (26 loc) • 876 B
JavaScript
;
/**
* Copyright (c) 2018-2019 mol* contributors, licensed under MIT, See LICENSE file for more info.
*
* @author Alexander Rose <alexander.rose@weirdbyte.de>
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.polygon = polygon;
/**
* Create 3d points for a polygon:
* 3 for a triangle, 4 for a rectangle, 5 for a pentagon, 6 for a hexagon...
*/
function polygon(sideCount, shift, radius = -1) {
const points = new Float32Array(sideCount * 3);
const r = radius === -1
? (sideCount <= 4 ? Math.sqrt(2) / 2 : 0.6)
: radius;
const offset = shift ? 1 : 0;
for (let i = 0, il = sideCount; i < il; ++i) {
const c = (i * 2 + offset) / sideCount * Math.PI;
points[i * 3] = Math.cos(c) * r;
points[i * 3 + 1] = Math.sin(c) * r;
points[i * 3 + 2] = 0;
}
return points;
}