算法 - 如何使用2D Flood填充地形成本？

Question

我的游戏中有两种移动算法 - one displays possible moves using Flood Fill，另一种算法使用A *来计算如何到达任何可能的位置。

现在洪水填充以下列格式返回信息

• 【产地]
• [1个移动中可到达的方块阵列]
• [2个移动中可到达的正方形阵列]

当我每个广场的移动/地形成本变化时，我对如何使用洪水填充感兴趣。

这是我当前的实施，没有移动费用：

-(NSMutableArray*)getValidMovesFromPoint:(CGPoint)p lockMovesInTileset:(NSMutableArray*)tileset usingConnexity:(int)connexity
{
    int i = 0;
    NSMutableArray* validMovesFromThisPoint = [NSMutableArray array];//these tiles are valid moves from point

    NSNumber* tileIsWalkable = nil;

    //using (x,y) (0,0) as bottom left corner, Y axis pointing up, X axis pointing right
    i = [self indexFromPoint:CGPointMake(p.x-1, p.y)];//left
    tileIsWalkable = tileset[i];
    if(tileIsWalkable.boolValue == YES)
    {
        [self lockTileAtIndex:i forTileset:tileset rememberValidMovesInThisArray:validMovesFromThisPoint];
    };

    i = [self indexFromPoint:CGPointMake(p.x+1, p.y)];//right
    tileIsWalkable = tileset[i];
    if(tileIsWalkable.boolValue == YES)
    {
        [self lockTileAtIndex:i forTileset:tileset rememberValidMovesInThisArray:validMovesFromThisPoint];
    };

    i = [self indexFromPoint:CGPointMake(p.x, p.y-1)];//bottom
    tileIsWalkable = tileset[i];
    if(tileIsWalkable.boolValue == YES)
    {
        [self lockTileAtIndex:i forTileset:tileset rememberValidMovesInThisArray:validMovesFromThisPoint];
    };

    i = [self indexFromPoint:CGPointMake(p.x, p.y+1)];//top
    tileIsWalkable = tileset[i];
    if(tileIsWalkable.boolValue == YES)
    {
        [self lockTileAtIndex:i forTileset:tileset rememberValidMovesInThisArray:validMovesFromThisPoint];
    };

    if(connexity == 4){
        return validMovesFromThisPoint;//if we want a connexity 4, no need to go further
    }

    i = [self indexFromPoint:CGPointMake(p.x-1, p.y-1)];//bottom left
    tileIsWalkable = tileset[i];
    if(tileIsWalkable.boolValue == YES){
        [self lockTileAtIndex:i forTileset:tileset rememberValidMovesInThisArray:validMovesFromThisPoint];
    };

    i = [self indexFromPoint:CGPointMake(p.x+1, p.y-1)];//bottom right
    tileIsWalkable = tileset[i];
    if(tileIsWalkable.boolValue == YES){
        [self lockTileAtIndex:i forTileset:tileset rememberValidMovesInThisArray:validMovesFromThisPoint];
    };

    i = [self indexFromPoint:CGPointMake(p.x-1, p.y+1)];//top left
    tileIsWalkable = tileset[i];
    if(tileIsWalkable.boolValue == YES){
        [self lockTileAtIndex:i forTileset:tileset rememberValidMovesInThisArray:validMovesFromThisPoint];
    };

    i = [self indexFromPoint:CGPointMake(p.x+1, p.y+1)];///top right
    tileIsWalkable = tileset[i];
    if(tileIsWalkable.boolValue == YES){
        [self lockTileAtIndex:i forTileset:tileset rememberValidMovesInThisArray:validMovesFromThisPoint];
    };

    return validMovesFromThisPoint;
}

Answer 1

显然不能使用洪水填充，而是实施Breadth First Search, as described in this post.这样可以将地形成本计算在计算中