50 lines
1.3 KiB
TypeScript
50 lines
1.3 KiB
TypeScript
import { Vec2 } from 'cc'
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export default class RandomUtil {
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//随机minNum到maxNum的数字 （包含maxNum）
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public static nextInt(minNum: number, maxNum: number) {
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return Math.floor(Math.random() * (maxNum - minNum + 1) + minNum)
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}
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public static nextNumber(minNum: number, maxNum: number) {
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return Math.random() * (maxNum - minNum) + minNum
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}
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public static nextSign() {
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let temp = Math.random()
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if (temp < 0.5) {
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return 1
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}
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return -1
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}
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public static nextBoolean() {
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let temp = Math.random()
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return temp < 0.5;
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}
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public static randomArr(nowArr: Array<any>, needNum: number) {
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let tempArr: Array<any> = nowArr.concat()
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let resultArr: Array<any> = []
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for (let index = 0; index < needNum; index++) {
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if (tempArr.length <= 0) {
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break
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}
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let randomIndex: number = RandomUtil.nextInt(0, tempArr.length - 1)
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resultArr.push(tempArr.splice(randomIndex, 1)[0])
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}
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return resultArr
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}
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public static randomItem(nowArr: Array<any>) {
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return this.randomArr(nowArr, 1)[0]
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}
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public static randomP(left: number, right: number, up: number, down: number) {
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let randomX: number = RandomUtil.nextNumber(left, right)
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let randomY: number = RandomUtil.nextNumber(up, down)
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return new Vec2(randomX, randomY)
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}
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}
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