Generate pie chart in After effects using createPath() expression

ae_pie_v1.js

const r = effect("Radius")("Slider");
const progress = Math.max(Math.min(effect("Completion")("Slider"), 1), 0);

const ratio = 0.551915024494;
const t = r*ratio;

const points = [[r,0],[0,r],[-r,0],[0,-r],[r,0]];
const inTangents = [[0,t],[-t,0],[0,-t],[t,0],[0,0]];
const outTangents = [[0,0],[t,0],[0,t],[-t,0],[0,-t]];

const endAngle = progress * 2 * Math.PI;
const endVertex = [Math.cos(endAngle), Math.sin(endAngle)] * r;
const endOutTangent = normalize([endVertex[1], -endVertex[0]])*t*((progress*4) % 1);

let r_points = [[0,0], endVertex],
    r_inTangents = [[0,0],[0,0]],
    r_outTangents = [[0,0],endOutTangent];

const limit = Math.floor(progress * 4);
for (i = 0; i <= limit; i++) {
	r_points.unshift(points[i]);
  r_inTangents.unshift(inTangents[i]);
	r_outTangents.unshift(outTangents[i]);
}
createPath(r_points, r_inTangents, r_outTangents)