Function zoomUnitsFromHfov

shared/src/aim.ts:554–569

(hfovDeg: number, lut: FovPoint[])

}

export function zoomUnitsFromHfov(hfovDeg: number, lut: FovPoint[]): number {
  const pts = [...lut].sort((a, b) => b.hfovDeg - a.hfovDeg); // wide -> tele
  if (pts.length === 0) return 0;
  if (hfovDeg >= pts[0].hfovDeg) return pts[0].units;
  const last = pts[pts.length - 1];
  if (hfovDeg <= last.hfovDeg) return last.units;
  for (let i = 1; i < pts.length; i++) {
    if (hfovDeg >= pts[i].hfovDeg) {
      const a = toLogTan(pts[i - 1].hfovDeg);
      const b = toLogTan(pts[i].hfovDeg);
      const f = (toLogTan(hfovDeg) - a) / (b - a);
      return Math.round(pts[i - 1].units * (1 - f) + pts[i].units * f);
    }
  }
  return last.units;
}

/**
 * The HFOV to command: frame the plane at ~1/4–1/3 of frame height, but never