风水罗盘

复制import math

# 罗盘 24 山方位角（度），以正北为 0°，顺时针递增
SHAN_ANGLES = {
    '子': 0, '癸': 15, '丑': 30, '艮': 45, '寅': 60, '甲': 75,
    '卯': 90, '乙': 105, '辰': 120, '巽': 135, '巳': 150, '丙': 165,
    '午': 180, '丁': 195, '未': 210, '坤': 225, '申': 240, '庚': 255,
    '酉': 270, '辛': 285, '戌': 300, '乾': 315, '亥': 330, '壬': 345
}

def azimuth_to_shan(azimuth: float) -> str:
    """将方位角（0-360）映射到最近的 24 山"""
    azimuth = azimuth % 360
    # 找到最小角度差的山
    nearest = min(SHAN_ANGLES, key=lambda s: abs(SHAN_ANGLES[s] - azimuth))
    return nearest

# 示例：正南 180° → 午山
print(azimuth_to_shan(180))  # 午

# 示例：东北 50° → 艮山（45°）
print(azimuth_to_shan(50))   # 艮

复制package main

import (
	"fmt"
	"math"
)

// 24山方位角映射
var shanAngles = map[string]float64{
	"子": 0, "癸": 15, "丑": 30, "艮": 45, "寅": 60, "甲": 75,
	"卯": 90, "乙": 105, "辰": 120, "巽": 135, "巳": 150, "丙": 165,
	"午": 180, "丁": 195, "未": 210, "坤": 225, "申": 240, "庚": 255,
	"酉": 270, "辛": 285, "戌": 300, "乾": 315, "亥": 330, "壬": 345,
}

// AzimuthToShan 将方位角（度）转换为最近的 24 山名称
func AzimuthToShan(azimuth float64) string {
	azimuth = math.Mod(azimuth, 360)
	if azimuth < 0 {
		azimuth += 360
	}
	nearest := ""
	minDiff := 360.0
	for shan, angle := range shanAngles {
		diff := math.Abs(angle - azimuth)
		if diff > 180 {
			diff = 360 - diff
		}
		if diff < minDiff {
			minDiff = diff
			nearest = shan
		}
	}
	return nearest
}

func main() {
	fmt.Println(AzimuthToShan(180)) // 午
	fmt.Println(AzimuthToShan(50))  // 艮
}

复制// 24 山方位角映射（度），正北 0° 顺时针
const SHAN_ANGLES = {
  '子': 0, '癸': 15, '丑': 30, '艮': 45, '寅': 60, '甲': 75,
  '卯': 90, '乙': 105, '辰': 120, '巽': 135, '巳': 150, '丙': 165,
  '午': 180, '丁': 195, '未': 210, '坤': 225, '申': 240, '庚': 255,
  '酉': 270, '辛': 285, '戌': 300, '乾': 315, '亥': 330, '壬': 345
};

/**
 * 将方位角（0-360）映射到最近的 24 山
 * @param {number} azimuth - 方位角（度）
 * @returns {string} 山名
 */
function azimuthToShan(azimuth) {
  azimuth = ((azimuth % 360) + 360) % 360;
  let nearest = '';
  let minDiff = 360;
  for (const [shan, angle] of Object.entries(SHAN_ANGLES)) {
    let diff = Math.abs(angle - azimuth);
    if (diff > 180) diff = 360 - diff;
    if (diff < minDiff) {
      minDiff = diff;
      nearest = shan;
    }
  }
  return nearest;
}

// 示例
console.log(azimuthToShan(180)); // 午
console.log(azimuthToShan(50));  // 艮