transform-circular.ts

  private transform(d) {
    const x = (((d.x0 + d.x1) / 2) * 180) / Math.PI;
    const y = ((d.y0 + d.y1) / 2) * this.radius;
    return `rotate(${x - 90}) translate(${y},0) rotate(${x < 180 ? 0 : 180})`;
  }

  private position(d) {
    const x = (((d.x0 + d.x1) / 2) * 180) / Math.PI;
    const y = ((d.y0 + d.y1) / 2) * this.radius;
    return `rotate(${x - 90}deg) translate(${this.radius}px,0px) rotate(${x < 180 ? 0 : 180}deg)`;
  }