100个 Unity小游戏系列三 -Unity 抽奖游戏专题三老虎机游戏

一、演示效果

二、知识点讲解

2.1 布局

public void CreateItems(SlotsData[] slotsData)
        {
            isInited = false;
            slotsPrizeList = new List<SlotsData>();
            for (int i = 0; i < slotsData.Length; i++)
            {
                var item = slotsData[i];
                slotsPrizeList.Add(item);
            }

            float bottomY = -itemPadding * frontItemCount;
            slotEdge = new Vector2(bottomY + itemPadding * slotsPrizeList.Count, bottomY);

            slotWheelsIds = new int[slotWheels.Length][];
            slotsStopIdx = new int[slotWheels.Length];

            for (int i = 0; i < slotWheelsIds.Length; i++)
            {
                slotWheelsIds[i] = new int[slotsPrizeList.Count];
                for (int j = 0; j < slotWheelsIds[i].Length; j++)
                {
                    slotWheelsIds[i][j] = slotsPrizeList[j].id;
                }
                int halfLen = slotsPrizeList.Count / 2;
                for (int j = 0; j < halfLen; j++)
                {
                    int randSwapIdx = UnityEngine.Random.Range(0, halfLen + 1);
                    int swapIdx2 = slotsPrizeList.Count - randSwapIdx - 1;
                    int tmpPrizeId = slotWheelsIds[i][swapIdx2];
                    slotWheelsIds[i][swapIdx2] = slotWheelsIds[i][randSwapIdx];
                    slotWheelsIds[i][randSwapIdx] = tmpPrizeId;
                }
            }

            for (int i = 0; i < slotWheels.Length; i++)
            {
                var wheel = slotWheels[i];
                for (int j = 0; j < slotWheelsIds[i].Length; j++)
                {
                    var prizeId = slotWheelsIds[i][j];
                    var reward_data = LuckyManager.Instance.GetDataById(rewardDatas, prizeId, out int index);
                    var item = Instantiate(slot_Item, wheel);
                    var pos = item.transform.localPosition;
                    pos.y = slotEdge.y + j * itemPadding;
                    item.transform.localPosition = pos;
                    item.transform.localScale = Vector3.one * itemSize;

                    var reward_img = item.GetComponentInChildren<Image>();
                    reward_img.sprite = itemImgs[reward_data.type - 1];
                    reward_img.SetNativeSize();
                    item.GetComponentInChildren<TextMeshProUGUI>().text = string.Format("{0}", reward_data.amount);
                    item.SetActive(true);
                }
            }
            isInited = true;
        }

2.2、转动逻辑

 private void OnClickSpin()
        {
            if (!isInited || IsRolling)
            {
                return;
            }

            GetSelectIndex();
            RollSlots(SpinComplete);
        }

  public void RollSlots(Action<bool, SlotsData> onSpinCompleted)
        {

            IsRolling = true;

            int rewardId = LuckyManager.Instance.CalculateRewardId(rewardDatas);
            var reward_data = LuckyManager.Instance.GetDataById(rewardDatas, rewardId, out int slot_index);


            bool isMatched = CalculateSlotStopIndex(reward_data, out slotsStopIdx);

            int slotWheelsCount = slotWheels.Length;
            int roundNum = 5;

            for (int i = 0; i < slotWheels.Length; i++)
            {
                var wheel = slotWheels[i];
                var stopIdx = slotsStopIdx[i];
                float rollDistance = roundNum * (slotEdge.x - slotEdge.y);
                var offsetY = wheel.GetChild(stopIdx).localPosition.y;
                rollDistance += offsetY < 0 ? Mathf.Abs(offsetY - slotEdge.y) + slotEdge.x : offsetY;

                float preframePosY = 0f;
                float curPosY = 0f;
                float rollTime = 2.5f;
                if (rollStyle2)
                {
                    rollTime = 2.5f + i * 0.5f;
                }
                else if (rollStyle3)
                {
                    rollTime = 4.5f - i * 0.5f;
                }
                else if (rollStyle4)
                {
                    rollTime = 2.5f + i * 2.5f;
                }

                var rollAnim = DOTween.To(() => curPosY, (x) => curPosY = x, rollDistance, rollTime);
                rollAnim.SetEase(Ease.OutQuart);
                rollAnim.onUpdate = () =>
                {
                    float deltaY = curPosY - preframePosY;
                    for (int j = 0; j < wheel.childCount; j++)
                    {
                        var item = wheel.GetChild(j);
                        float nextPosY = item.transform.localPosition.y - deltaY;
                        var localPosition = item.transform.localPosition;
                        localPosition.y = nextPosY < slotEdge.y ? slotEdge.x - (slotEdge.y - nextPosY) : nextPosY;
                        item.transform.localPosition = localPosition;
                    }
                    preframePosY = curPosY;
                };
                rollAnim.onComplete = () =>
                {
                    if (--slotWheelsCount <= 0)
                    {
                        IsRolling = false;
                        onSpinCompleted.Invoke(isMatched, reward_data);
                    }
                };
            }
        }