FruitFrolic

    这是一个连连看小游戏，以 Unity2D 开发。因用了数种水果图片来做头像，所以游戏取名 FruitFrolic。同样，它也只是我闲时的练手。

    少时曾玩过掌上游戏机里的俄罗斯方块及打飞机，及手机上的推箱子等，也在 Dos 上玩过几乎人人皆知的超级玛丽。我很想在闲暇的时候自己来实现它们，但为兴趣和乐趣而已。所以有前文所述的 PetGenie，以及本文，和之后可能的自实现版俄罗斯方块。不过限于美术素材及个人精力等之因，它们应会实现得比较简陋，虽然游戏核心逻辑几都具备。

    而我所使用的所有美术素材及音频等都来源于网络，本着开放的原则，我的（所有）自实现小游戏也都开源，且没有任何版权等限制。

    连连看的核心显然在洗牌及连线分析算法。洗牌控制了游戏的难易，变化很多。但我这里只是简单地平均生成了头像并随机打乱，而在连线分析算法里使用了广度优先搜索。

    洗牌代码如下。

void RandomGenies() {
        int idx;
        // 共 6 * 8 个格子、12 种水果 --> 每种水果生成 4 次
        int[] geniesCounter = new int[cSpriteTypeCount] {4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4};
        for (int i = 0; i < cGridRows; i++) {
            for (int j = 0; j < cGridCols; j++) {
                genies[i, j].x = i;
                genies[i, j].y = j;
                while (true) {
                    idx = (int)(Random.value * cSpriteTypeCount);
                    if (geniesCounter[idx] > 0) {
                        break;
                    }
                }
                geniesCounter[idx]--;
                genies[i, j].index = idx;
                genies[i, j].spriteRenderer.sprite = fruitSprites[idx];
            }
        }
    }

    而连线分析实现代码如下。

void DetectLink() {
        if (!ValidPrecondition()) {
            return;
        }

        List<TGenie> contnr0 = new List<TGenie>();
        FindCells((int)(touchCoords.pos1.x), (int)(touchCoords.pos1.y), contnr0);
        if (CellExists(genies[(int)(touchCoords.pos2.y), (int)(touchCoords.pos2.x)], contnr0)) {
            genies[(int)(touchCoords.pos1.y), (int)(touchCoords.pos1.x)].index = cInvalidCoordValue;
            genies[(int)(touchCoords.pos2.y), (int)(touchCoords.pos2.x)].index = cInvalidCoordValue;
            return;
        }

        List<TGenie> contnr1 = new List<TGenie>();
        PrepareContnr(contnr0, contnr1);
        ShrinkContnr(contnr0, contnr1);
        if (CellExists(genies[(int)(touchCoords.pos2.y), (int)(touchCoords.pos2.x)], contnr1)) {
            genies[(int)(touchCoords.pos1.y), (int)(touchCoords.pos1.x)].index = cInvalidCoordValue;
            genies[(int)(touchCoords.pos2.y), (int)(touchCoords.pos2.x)].index = cInvalidCoordValue;
            return;
        }

        List<TGenie> contnr2 = new List<TGenie>();
        PrepareContnr(contnr1, contnr2);
        ShrinkContnr(contnr0, contnr2);
        ShrinkContnr(contnr1, contnr2);
        if (CellExists(genies[(int)(touchCoords.pos2.y), (int)(touchCoords.pos2.x)], contnr2)) {
            genies[(int)(touchCoords.pos1.y), (int)(touchCoords.pos1.x)].index = cInvalidCoordValue;
            genies[(int)(touchCoords.pos2.y), (int)(touchCoords.pos2.x)].index = cInvalidCoordValue;
            return;
        }

        DetectSpecialLink();
    }

bool ValidPrecondition() {
        if ((touchCoords.pos1.x == cInvalidCoordValue) || (touchCoords.pos1.y == cInvalidCoordValue) || (touchCoords.pos2.x == cInvalidCoordValue) || (touchCoords.pos2.y == cInvalidCoordValue)) {
            return false;
        }
        
        if ((touchCoords.pos1.x == touchCoords.pos2.x) && (touchCoords.pos1.y == touchCoords.pos2.y)) {
            return false;
        }
        
        if (genies[(int)(touchCoords.pos1.y), (int)(touchCoords.pos1.x)].index != genies[(int)(touchCoords.pos2.y), (int)(touchCoords.pos2.x)].index) {
            return false;
        }

        return true;
    }

void FindCells(int x, int y, List<TGenie> contnr) {
        int n = 0;
        n = y - 1;
        if (n >= 0) {
            if (!(contnr.Contains(genies[n, x]))) {            
                contnr.Add(genies[n, x]);
            }
        }
        while ((n >= 0) && (genies[n, x].index == cInvalidCoordValue)) {
            n--;
            if ((n >= 0) && (!(contnr.Contains(genies[n, x])))) {
                contnr.Add(genies[n, x]);
            }
        }

        n = y + 1;
        if (n < cGridRows) {
            if (!(contnr.Contains(genies[n, x]))) {            
                contnr.Add(genies[n, x]);
            }
        }
        while ((n < cGridRows) && (genies[n, x].index == cInvalidCoordValue)) {
            n++;
            if ((n < cGridRows) && (!(contnr.Contains(genies[n, x])))) {
                contnr.Add(genies[n, x]);
            }
        }

        n = x - 1;
        if (n >= 0) {
            if (!(contnr.Contains(genies[y, n]))) {            
                contnr.Add(genies[y, n]);
            }
        }
        while ((n >= 0) && (genies[y, n].index == cInvalidCoordValue)) {
            n--;
            if ((n >= 0) && (!(contnr.Contains(genies[y, n])))) {
                contnr.Add(genies[y, n]);
            }
        }

        n = x + 1;
        if (n < cGridCols) {
            if (!(contnr.Contains(genies[y, n]))) {            
                contnr.Add(genies[y, n]);
            }
        }
        while ((n < cGridCols) && (genies[y, n].index == cInvalidCoordValue)) {
            n++;
            if ((n < cGridCols) && (!(contnr.Contains(genies[y, n])))) {
                contnr.Add(genies[y, n]);
            }
        }
    }

    bool CellExists(TGenie genie, List<TGenie> contnr) {
        foreach (TGenie g in contnr) {
            if (g.Equals(genie)) {
                return true;
            }
        }

        return false;
    }

    void PrepareContnr(List<TGenie> contnrSrc, List<TGenie> contnrDest) {
        foreach (TGenie g in contnrSrc) {
            if (g.index == cInvalidCoordValue) {
                FindCells(g.y, g.x, contnrDest);
            }
        }
    }

    void ShrinkContnr(List<TGenie> contnrSrc, List<TGenie> contnrDest) {
        foreach (TGenie g in contnrSrc) {
            if (contnrDest.Contains(g)) {
                contnrDest.Remove(g);
            }
        }
    }

void DetectSpecialLink() {
        // 若在第一或最末列
        if (touchCoords.pos1.x == touchCoords.pos2.x) {
            if ((touchCoords.pos1.x == 0) || (touchCoords.pos1.x == cGridCols - 1)) {
                genies[(int)(touchCoords.pos1.y), (int)(touchCoords.pos1.x)].index = cInvalidCoordValue;
                genies[(int)(touchCoords.pos2.y), (int)(touchCoords.pos2.x)].index = cInvalidCoordValue;                
                return;
            }
        }

        // 若在第一或最末行
        if (touchCoords.pos1.y == touchCoords.pos2.y) {
            if ((touchCoords.pos1.y == 0) || (touchCoords.pos1.y == cGridRows - 1)) {
                genies[(int)(touchCoords.pos1.y), (int)(touchCoords.pos1.x)].index = cInvalidCoordValue;
                genies[(int)(touchCoords.pos2.y), (int)(touchCoords.pos2.x)].index = cInvalidCoordValue;                
                return;
            }
        }
    }

    判断是否已连线完毕（已全部消除或已死锁）的代码如下。

bool HasMatches() {
        // 检测上下左右第一行/列是否有可消除的格子(特殊处理)
        for (int i = 0; i < cGridCols - 1; i++) {
            if (genies[0, i].index != cInvalidCoordValue) {
                for (int j = i + 1; j < cGridCols; j++) {
                    if (genies[0, i].index == genies[0, j].index) {
                        return true;
                    }
                }
            }

            if (genies[cGridRows - 1, i].index != cInvalidCoordValue) {
                for (int j = i + 1; j < cGridCols; j++) {
                    if (genies[cGridRows - 1, i].index == genies[cGridRows - 1, j].index) {
                        return true;
                    }
                }
            }
        }

        for (int i = 0; i < cGridRows - 1; i++) {
            if (genies[i, 0].index != cInvalidCoordValue) {
                for (int j = i + 1; j < cGridRows; j++) {
                    if (genies[i, 0].index == genies[j, 0].index) {
                        return true;
                    }
                }
            }
            
            if (genies[i, cGridCols - 1].index != cInvalidCoordValue) {
                for (int j = i + 1; j < cGridRows; j++) {
                    if (genies[i, cGridCols - 1].index == genies[j, cGridCols - 1].index) {
                        return true;
                    }
                }
            }
        }

        for (int i = 0; i < cGridRows; i++) {
            for (int j = 0; j < cGridCols; j++) {
                if (genies[i, j].index != cInvalidCoordValue) {
                    // 0 转弯
                    List<TGenie> contnr0 = new List<TGenie>();
                    FindCells(j, i, contnr0);
                    if (HasMatchableGenie(genies[i, j], contnr0)) {                        
                        return true;
                    }

                    // 1 转弯
                    List<TGenie> contnr1 = new List<TGenie>();
                    PrepareContnr(contnr0, contnr1);
                    ShrinkContnr(contnr0, contnr1);
                    if (HasMatchableGenie(genies[i, j], contnr1)) {                        
                        return true;
                    }

                    // 2 转弯
                    List<TGenie> contnr2 = new List<TGenie>();
                    PrepareContnr(contnr1, contnr2);
                    ShrinkContnr(contnr0, contnr2);
                    ShrinkContnr(contnr1, contnr2);
                    RemoveNullGenies(contnr2);
                    if (HasMatchableGenie(genies[i, j], contnr2)) {                        
                        return true;
                    }
                }
            }
        }

        return false;
    }

bool HasMatchableGenie(TGenie genie, List<TGenie> contnr) {
        foreach (TGenie g in contnr) {
            if ((!g.Equals(genie)) && (g.index == genie.index)) {
                return true;
            }
        }
        
        return false;
    }

    void RemoveNullGenies(List<TGenie> contnr) {
        List<TGenie> tmp = new List<TGenie>();
        foreach (TGenie g in contnr) {
            if (g.index == cInvalidCoordValue) {
                tmp.Add(g);
            }
        }

        foreach (TGenie g in tmp) {
            contnr.Remove(g);
        }
    }

    其实我本想分析每一种可能的连线情况（0---2 个转弯），但在写完 0 和 1 个转弯分析之后不想再写 2 个转弯分析代码了，因它们确实不好理解（也不好维护）。

// 0 个转角连通
    bool CheckLink0() {
        // 若在同一列格子
        if (touchCoords.pos1.x == touchCoords.pos2.x) {
            if ((touchCoords.pos1.x != 0) && (touchCoords.pos1.x != cGridCols - 1)) {
                if (touchCoords.pos1.y < touchCoords.pos2.y) {
                    for (int i = (int)(touchCoords.pos1.y) + 1; i < ((int)(touchCoords.pos2.y)); i++) {
                        if (genies[i, (int)(touchCoords.pos1.x)].index != cInvalidCoordValue) {
                            return false;
                        }
                    }
                } else {
                    for (int i = (int)(touchCoords.pos2.y) + 1; i < ((int)(touchCoords.pos1.y)); i++) {
                        if (genies[i, (int)(touchCoords.pos1.x)].index != cInvalidCoordValue) {
                            return false;
                        }
                    }
                }
            }

            genies[(int)(touchCoords.pos1.y), (int)(touchCoords.pos1.x)].index = cInvalidCoordValue;
            genies[(int)(touchCoords.pos2.y), (int)(touchCoords.pos2.x)].index = cInvalidCoordValue;
            
            return true;
        }
        
        // 若在同一行格子
        if (touchCoords.pos1.y == touchCoords.pos2.y) {
            if ((touchCoords.pos1.y != 0) && (touchCoords.pos1.y != cGridRows - 1)) {
                if (touchCoords.pos1.x < touchCoords.pos2.x) {
                    for (int i = (int)(touchCoords.pos1.x) + 1; i < ((int)(touchCoords.pos2.x)); i++) {
                        if (genies[(int)(touchCoords.pos1.y), i].index != cInvalidCoordValue) {
                            return false;
                        }
                    }
                } else {
                    for (int i = (int)(touchCoords.pos2.x) + 1; i < ((int)(touchCoords.pos1.x)); i++) {
                        if (genies[(int)(touchCoords.pos1.y), i].index != cInvalidCoordValue) {
                            return false;
                        }
                    }
                }
            }

            genies[(int)(touchCoords.pos1.y), (int)(touchCoords.pos1.x)].index = cInvalidCoordValue;
            genies[(int)(touchCoords.pos2.y), (int)(touchCoords.pos2.x)].index = cInvalidCoordValue;
            
            return true;
        }

        return false;
    }

    // 1 个转角连通 --> 相当于两个格子划出一个矩形, 这两个格子是一对对角顶点, 另两个顶点如果可以同时和这两个格子直连, 那就说明可以连通
    bool CheckLink1() {
        int l = cInvalidCoordValue, t = cInvalidCoordValue, r = cInvalidCoordValue, b = cInvalidCoordValue;
        if (touchCoords.pos1.y < touchCoords.pos2.y) {
            t = (int)(touchCoords.pos1.y);
            b = (int)(touchCoords.pos2.y);
        } else {
            t = (int)(touchCoords.pos2.y);
            b = (int)(touchCoords.pos1.y);
        }
        if (touchCoords.pos1.x < touchCoords.pos2.x) {
            l = (int)(touchCoords.pos1.x);
            r = (int)(touchCoords.pos2.x);
        } else {
            l = (int)(touchCoords.pos2.x);
            r = (int)(touchCoords.pos1.x);
        }
        
        if (genies[t, l].index == cInvalidCoordValue) {  // 若选取的两个格子在 右上、左下
            for (int i = t + 1; i < b; i++) {
                if (genies[i, l].index != cInvalidCoordValue) {
                    return false;
                }
            }
            
            for (int j = l + 1; j < r; j++) {
                if (genies[t, j].index != cInvalidCoordValue) {
                    return false;
                }
            }
            
            genies[t, r].index = cInvalidCoordValue;
            genies[b, l].index = cInvalidCoordValue;
            
            return true;
        } else if (genies[t, r].index == cInvalidCoordValue) {  // 若选取的两个格子在 左上、右下
            for (int i = t + 1; i < b; i++) {
                if (genies[i, r].index != cInvalidCoordValue) {
                    return false;
                }
            }
            
            for (int j = l + 1; j < r; j++) {
                if (genies[t, j].index != cInvalidCoordValue) {
                    return false;
                }
            }
            
            genies[t, l].index = cInvalidCoordValue;
            genies[b, r].index = cInvalidCoordValue;
            
            return true;
        } else if (genies[b, l].index == cInvalidCoordValue) {  // 若选取的两个格子在 左上、右下
            for (int i = t + 1; i < b; i++) {
                if (genies[i, r].index != cInvalidCoordValue) {
                    return false;
                }
            }
            
            for (int j = l + 1; j < r; j++) {
                if (genies[b, j].index != cInvalidCoordValue) {
                    return false;
                }
            }
            
            genies[t, l].index = cInvalidCoordValue;
            genies[b, r].index = cInvalidCoordValue;
            
            return true;            
        } else if (genies[b, r].index == cInvalidCoordValue) {  // 若选取的两个格子在 右上、左下
            for (int i = t + 1; i < b; i++) {
                if (genies[i, l].index != cInvalidCoordValue) {
                    return false;
                }
            }
            
            for (int j = l + 1; j < r; j++) {
                if (genies[b, j].index != cInvalidCoordValue) {
                    return false;
                }
            }
            
            genies[t, r].index = cInvalidCoordValue;
            genies[b, l].index = cInvalidCoordValue;
            
            return true;
        }

        return false;
    }

    游戏真机运行截图如下。

    代码下载链接在这里。