construir estrela

star.js

buildStar(x, y, radius) {
    let pentagon = this.buildPolygonRegular(x, y, radius, 5);
    let p0 = lineIntersection(pentagon[0], pentagon[2], pentagon[1], pentagon[4]);
    let p1 = lineIntersection(pentagon[0], pentagon[2], pentagon[1], pentagon[3]);
    let p2 = lineIntersection(pentagon[2], pentagon[4], pentagon[3], pentagon[1]);
    let p3 = lineIntersection(pentagon[2], pentagon[4], pentagon[3], pentagon[0]);
    let p4 = lineIntersection(pentagon[0], pentagon[3], pentagon[1], pentagon[4]);


    let output = [];
    output.push(
        pentagon[0], s0, s4,
        pentagon[1], s0, s1,
        pentagon[2], s1, s2,
        pentagon[3], s2, s3,
        pentagon[4], s3, s4
    );

    return output;
},