b23_zuma/assets/script/utils/MathUtils.ts

/** @format */
// ---------Math-----------
interface Math {
    /**
     * 返回[min,max]闭区间随机整数
     * @param min 最小值
     * @param max 最大值
     * @param seed 随机种子
     */
    randomRangeInt(min: number, max: number, seed?: number): number

    /**
     * 返回[min,max]闭区间随机浮点数
     * @param min 最小值
     * @param max 最大值
     * @param seed 随机种子
     */
    randomRangeFloat(min: number, max: number, seed?: number): number

    /**
     * 返回[min,max]闭区间随机整数数组
     * @param min 最小值
     * @param max 最大值
     * @param count 数量
     * @param seed 随机种子
     */
    randomRangeIntArr(min: number, max: number, count: number, seed?: number): number[]

    /**
     * 返回余数
     * @param x 除数
     * @param y 被除数
     */
    fMod(x: number, y: number): number

    /**
     * 返回正态分布随机数
     * @param mean 基数
     * @param stdDev 标准差
     */
    getNumberInNormalDistribution(mean, stdDev)

    randomNormalDistribution()

    /**
     * 给一个数添加前导0
     * @param num 数字
     * @param length 包含数字的位数
     */
    addPreZero(num: number, length: number)

    /**
     * 给定圆心坐标和圆的半径，获得一个圆内的随机点
     * @param pos 圆心
     * @param radius 半径
     */
    getCirclesRandPos(pos: cc.Vec2, radius: number)

    /**
     * 获取一个概率是否成功
     * @param val 0 - 1
     */
    getProb(val: number, seed?: number)

    /**
     * 判断阿拉伯数字转换成中文
     * @param num 阿拉伯数字
     * @return 对应中文
     */
    toBigTextNum(num: Number): string

    // 判断一个整数是否在安全的范围
    isSafeInteger(n: number)

    /**
     * 将数字转换为带有 K、M、B 等后缀的字符串
     * @param num 数字
     * @return 对应字符串
     */
    toKMBNum(num: Number): string

    /**
     * 限制数字再指定范围内，如果超出范围，则返回边界值
     * @param value
     * @param min
     * @param max
     */
    clampValue(value: number, min: number, max: number): number

    /**
     * 获取目标数二进制最后一位开始某个位置的数字是0还是1的布尔值
     * @param target
     * @param index
     */
    getBitBool(target: number, index: number): boolean

    /*
     * 是否开启伪随机
     */
    isSeededRandom: boolean
    /*
     * 随机种子
     */
    seed: number
}

Math.isSeededRandom = false
Math.seed = Date.now()
Math.randomRangeInt = (min: number, max: number, seed: number): number => {
    let rand = Math.random()
    if (seed || Math.isSeededRandom) {
        rand = createRandom(seed)
    }
    if (rand === 1) {
        rand -= Number.EPSILON
    }
    return min + Math.floor(rand * (max - min + 1))
}
Math.randomRangeFloat = (min: number, max: number, seed: number): number => {
    let rand = Math.random()
    if (seed || Math.isSeededRandom) {
        rand = createRandom(seed)
    }
    return min + rand * (max - min)
}
Math.randomRangeIntArr = (min: number, max: number, count: number, seed: number): number[] => {
    if (count > max - min + 1) {
        return []
    }
    let tempArr = []
    for (let i = min; i <= max; i++) {
        tempArr.push(i)
    }
    let newArrList = []
    for (let i = 0; i < count; i++) {
        let baseRandom = Math.random()
        if (seed || Math.isSeededRandom) {
            baseRandom = createRandom(seed)
        }
        let random = Math.floor(baseRandom * tempArr.length)
        let value = tempArr[random]
        tempArr.splice(random, 1)
        newArrList.push(value)
    }
    return newArrList
}
Math.fMod = (x: number, y: number): number => {
    const temp = Math.floor(x / y)
    return x - temp * y
}

Math.getNumberInNormalDistribution = (mean, stdDev) => mean + Math.randomNormalDistribution() * stdDev

Math.randomNormalDistribution = () => {
    let u = 0.0
    let v = 0.0
    let w = 0.0
    let c = 0.0
    do {
        // 获得两个（-1,1）的独立随机变量
        u = Math.random() * 2 - 1.0
        v = Math.random() * 2 - 1.0
        w = u * u + v * v
    } while (w == 0.0 || w >= 1.0)
    // 这里就是 Box-Muller转换
    c = Math.sqrt((-2 * Math.log(w)) / w)
    // 返回2个标准正态分布的随机数，封装进一个数组返回
    // 当然，因为这个函数运行较快，也可以扔掉一个
    // return [u*c,v*c];
    return u * c
}

Math.addPreZero = (num: number, length: number) => {
    let numstr = num.toString()
    const l = numstr.length
    if (numstr.length >= length) {
        return numstr
    }
    for (let i = 0; i < length - l; i++) {
        numstr = `0${numstr}`
    }
    return numstr
}

Math.getCirclesRandPos = (pos: cc.Vec2, radius: number) => {
    const r = radius * Math.sqrt(Math.random())
    const theta = Math.random() * 2 * Math.PI
    return cc.v2(pos.x + r * Math.cos(theta), pos.y + r * Math.sin(theta))
}

Math.getProb = (val: number, seed: number) => {
    if (val == 0) {
        return false
    }
    const probability = val * 100 || 1
    let rand = Math.random()
    if (seed || Math.isSeededRandom) {
        rand = createRandom(seed)
    }
    const odds = Math.floor(rand * 100)
    if (probability === 1 && val != 0.01) {
        return true
    }
    if (odds < probability) {
        return true
    }
    return false
}

Math.toBigTextNum = (num: number) => {
    const chnNumChar = ['零', '一', '二', '三', '四', '五', '六', '七', '八', '九']
    const chnUnitSection = ['', '万', '亿', '万亿', '亿亿']
    const chnUnitChar = ['', '十', '百', '千']

    const SectionToChinese = section => {
        let strIns = ''
        let chnStr = ''
        let unitPos = 0
        let zero = true
        while (section > 0) {
            const v = section % 10
            if (v === 0) {
                if (!zero) {
                    zero = true
                    chnStr = chnNumChar[v] + chnStr
                }
            } else {
                zero = false
                strIns = chnNumChar[v]
                strIns += chnUnitChar[unitPos]
                chnStr = strIns + chnStr
            }
            unitPos++
            section = Math.floor(section / 10)
        }
        return chnStr
    }

    let unitPos = 0
    let strIns = ''
    let chnStr = ''
    let needZero = false

    if (num === 0) {
        return chnNumChar[0]
    }

    while (num > 0) {
        const section = num % 10000
        if (needZero) {
            chnStr = chnNumChar[0] + chnStr
        }
        strIns = SectionToChinese(section)
        strIns += section !== 0 ? chnUnitSection[unitPos] : chnUnitSection[0]
        chnStr = strIns + chnStr
        needZero = section < 1000 && section > 0
        num = Math.floor(num / 10000)
        unitPos++
    }
    return chnStr
}

Math.isSafeInteger = n =>
    typeof n === 'number' && // 判断是否是一个数字类型
    Math.round(n) === n && // 判断是否是整数，Math.round()方法用于取整
    Number.MIN_SAFE_INTEGER <= n && // 判断是否大于最小整数
    n <= Number.MAX_SAFE_INTEGER // 判断是否小于最大整数
let createRandom = seed => {
    if (!seed) {
        Math.seed += 1
        seed = Math.seed
    }
    let x = Math.sin(seed) * 10000
    return x - Math.floor(x)
}

Math.toKMBNum = (num: number): string => {
    const suffixes = ['', 'K', 'M', 'B', 'T']
    let suffixIndex = 0
    let origin = num
    while (num >= 1000 && suffixIndex < suffixes.length - 1) {
        num /= 1000
        suffixIndex++
    }
    return origin < 1000 ? String(num.toFixed(0)) : num.toFixed(2) + suffixes[suffixIndex]
}
Math.clampValue = (value: number, min: number, max: number): number => {
    return value < min ? min : value > max ? max : value
}
Math.getBitBool = (target: number, index: number): boolean => {
    return (target & (1 << index)) !== 0
}