private bool CouldWaterFlowDown(GridEntryViewModel entry)
{
if (entry.Y == this.YLength - 1)
{
//Water can flow out below the map
return(true);
}
var cellRightBelow = this.Cells[entry.Y + 1][entry.X];
if (cellRightBelow.Type == GridEntryType.RunningWater)
{
//Water is already running down from here
return(true);
}
if (cellRightBelow.Type == GridEntryType.Sand)
{
MakeWaterFlow(cellRightBelow);
return(true);
}
//There is either clay or still water below us, so we can't run further down
return(false);
}
private void LetWaterFlowHorizontally(List <GridEntryViewModel> waterThatDidNotFlowDown)
{
//This might/will find duplicate bodies of water, but that doesn't matter
var nextWaterBodyEdges =
waterThatDidNotFlowDown
.Select(entry =>
{
//This will be left as null if we come to the edge or any along the path can flow down
GridEntryViewModel nextOnLeftSide = null;
for (var x = entry.X; x >= 0; x--)
{
//If it's not running water, it should be sand or clay, so this is what we're looking for.
if (Cells[entry.Y][x].Type != GridEntryType.RunningWater)
{
nextOnLeftSide = Cells[entry.Y][x];
break;
}
GridEntryViewModel cellRightBelow = Cells[entry.Y + 1][x];
if (cellRightBelow.Type == GridEntryType.RunningWater || cellRightBelow.Type == GridEntryType.Sand)
{
break;
}
}
//This will be left as null if we come to the edge or any along the path can flow down
GridEntryViewModel nextOnRightSide = null;
for (var x = entry.X; x < XLength; x++)
{
//If it's not running water, it should be sand or clay, so this is what we're looking for.
if (Cells[entry.Y][x].Type != GridEntryType.RunningWater)
{
nextOnRightSide = Cells[entry.Y][x];
break;
}
GridEntryViewModel cellRightBelow = Cells[entry.Y + 1][x];
if (cellRightBelow.Type == GridEntryType.RunningWater || cellRightBelow.Type == GridEntryType.Sand)
{
break;
}
}
return(Tuple.Create(nextOnLeftSide, nextOnRightSide));
})
.ToArray();
foreach (var waterBodyEdges in nextWaterBodyEdges)
{
switch (waterBodyEdges.Item1?.Type)
{
case null:
//This means we have an edge here
break;
case GridEntryType.Sand:
MakeWaterFlow(waterBodyEdges.Item1);
break;
case GridEntryType.Clay:
//This case is handled by the right edge instead
break;
default:
//This most likely happens because we have a duplicate of the body of water, so this is just to be ignored
break;
}
switch (waterBodyEdges.Item2?.Type)
{
case null:
//This means we have an edge here
break;
case GridEntryType.Sand:
MakeWaterFlow(waterBodyEdges.Item2);
break;
case GridEntryType.Clay:
//If both of the edges are clay, let's freeze the water.
if (waterBodyEdges.Item1?.Type == GridEntryType.Clay)
{
for (var x = waterBodyEdges.Item1.X + 1; x < waterBodyEdges.Item2.X; x++)
{
MakeWaterStill(Cells[waterBodyEdges.Item1.Y][x]);
}
}
break;
default:
//This most likely happens because we have a duplicate of the body of water, so this is just to be ignored
break;
}
}
}
private void MakeWaterStill(GridEntryViewModel cell)
{
cell.Type = GridEntryType.StillWater;
_cellsWithRunningWater.Remove(cell);
}
private void MakeWaterFlow(GridEntryViewModel cell)
{
cell.Type = GridEntryType.RunningWater;
_waterCells.Add(cell);
_cellsWithRunningWater.Add(cell);
}