91 lines
2.8 KiB
TypeScript
91 lines
2.8 KiB
TypeScript
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export module RandomEx {
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/**
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* 取得隨機布林值
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*/
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export function GetBool() {
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return GetInt() >= 0;
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}
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/**
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* 取得隨機整數(回傳min ~ max - 1)
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* @param min
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* @param max
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*/
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export function GetInt(min: number = Number.MIN_VALUE, max: number = Number.MAX_VALUE): number {
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return Math.floor(Math.random() * (max - min)) + min;
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}
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/**
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* 取得隨機小數
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* @param min
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* @param max
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*/
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export function GetFloat(min: number = Number.MIN_VALUE, max: number = Number.MAX_VALUE): number {
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return Math.random() * (max - min) + min;
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}
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/**
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* 隨機取得複數個不重複回傳
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* @param num 取得數量
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* @param items 陣列
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*/
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export function GetMultiNoRepeat(num: number, items: any[]): any[] {
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let result: any[] = [];
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for (let i: number = 0; i < num; i++) {
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let ran: number = Math.floor(Math.random() * items.length);
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let item = items.splice(ran, 1)[0];
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if (result.indexOf(item) == -1) {
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result.push(item);
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}
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};
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return result;
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}
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/**
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* 根據權重取得複數個不重複回傳
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* @param prize 獎項
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* @param weights 機率
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* @param count 數量
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*/
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export function GetMultiNoRepeatByWeight(prize: any[], weights: number[] = null, count: number = 1): any[] {
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if (weights === null) {
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weights = [];
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for (let i: number = 0; i < prize.length; i++) {
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weights.push(1);
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}
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}
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let target: any[] = [];
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for (let i: number = 0; i < count; i++) {
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let results: number[] = RandomEx.GetPrizeByWeight(prize, weights);
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prize.splice(results[0], 1);
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weights.splice(results[0], 1);
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target.push(results[1]);
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}
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return target;
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}
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/**
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* 根據權重隨機取值
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* @param prize 獎項
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* @param weights 機率
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*/
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export function GetPrizeByWeight(prize: any[], weights: number[]): any[] {
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if (prize.length !== weights.length) {
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console.error(`GetWeight error -> prize.length:${prize.length} !== weights.length:${weights.length}`);
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return null;
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}
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let totalWeight: number = 0;
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for (let i: number = 0; i < weights.length; i++) {
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totalWeight += weights[i];
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}
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let random: number = RandomEx.GetInt(0, totalWeight) + 1;
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let nowWeight: number = weights[0];
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for (let i: number = 0; i < weights.length; i++) {
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if (nowWeight >= random) {
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return [i, prize[i]];
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}
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nowWeight += weights[i + 1];
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}
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}
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}
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