turf计算点与面两侧之间的夹角

import * as turf from '@turf/turf';

// 定义面
const polygon = turf.polygon([[
  [-122.801742, 45.48565],
  [-122.801742, 45.60491],
  [-122.584762, 45.60491],
  [-122.584762, 45.48565],
  [-122.801742, 45.48565]
]]);

// 中心点
const center = turf.centerOfMass(polygon);

// 测试点半径
const radius = 1500; // meters

// 旋转角度
const angle = 5; // degrees

// 生成测试点序列
const points = [];
for (let i = 0; i < 360 / angle; i++) {
  points.push(turf.transformRotate(center, angle * i, { units: 'meters', distance: radius }));
}

// 计算角度
let angleSum = 0;
let insideCount = 0;
points.forEach((point) => {
  if (turf.booleanPointInPolygon(point, polygon)) {
    const bearing = turf.bearing(center, point);
    const angleDiff = (bearing - angleSum + 360) % 360;
    angleSum += angleDiff;
    insideCount++;
  }
});

// 平均角度
const averageAngle = angleSum / insideCount;
console.log('Average angle: ', averageAngle);