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