Function pointInPolygon

src/components/CropPlanningSection.tsx:1456–1467

(point: [number, number], polygon: [number, number][])

function getMetersPerLng(latitude: number) {
  return 111320 * Math.cos((latitude * Math.PI) / 180);
}

function pointInPolygon(point: [number, number], polygon: [number, number][]) {
  let inside = false;
  for (let i = 0, j = polygon.length - 1; i < polygon.length; j = i++) {
    const xi = polygon[i][0];
    const yi = polygon[i][1];
    const xj = polygon[j][0];
    const yj = polygon[j][1];
    const intersect = yi > point[1] !== yj > point[1] && point[0] < ((xj - xi) * (point[1] - yi)) / (yj - yi || 1e-9) + xi;
    if (intersect) inside = !inside;
  }
  return inside;
}