private List <PizzaSlice> PerformSlice_PhaseTwo(int[,] plate)
{
int nextSliceId = -1;
Dictionary <int, PizzaSlice> sliceHash = new Dictionary <int, PizzaSlice>();
// Slice Pizza
for (int r = 0; r < mRows; r++)
{
for (int c = 0; c < mColumns; c++)
{
if (SlicePizzaAtPosition(plate, r, c, sliceHash, nextSliceId) == true)
{
nextSliceId--;
}
}
}
// Try re-slicing
List <PizzaSlice> slices = new List <PizzaSlice>(sliceHash.Values);
foreach (PizzaSlice slice in slices)
{
PizzaSlice currentSlice = sliceHash[slice.ID];
sliceHash.Remove(currentSlice.ID);
currentSlice.RestoreSliceToPlate(plate, mPlate);
SlicePizzaAtPosition(plate, currentSlice.RowMin, currentSlice.ColumnMin, sliceHash, currentSlice.ID);
}
return(new List <PizzaSlice>(sliceHash.Values));
}
private bool SlicePizzaAtPosition(int[,] plate, int r, int c, Dictionary <int, PizzaSlice> sliceHash, int nextSliceId)
{
if (plate[r, c] < 0)
{
return(false);
}
PizzaSlice maxSlice = GetMaxSliceExtentionAt(plate, sliceHash, r, c, nextSliceId);
if (maxSlice != null)
{
// Shrink existing slices
Dictionary <int, int> sliceContent = maxSlice.GetSliceContent(plate);
foreach (int overlapSliceId in sliceContent.Keys)
{
if (overlapSliceId > 0)
{
continue;
}
PizzaSlice existingSlice = sliceHash[overlapSliceId];
PizzaSlice existingAfterOverlap = existingSlice.BuildShirnkedSliceWithOverlapping(maxSlice);
sliceHash[existingSlice.ID] = existingAfterOverlap;
}
maxSlice.RemoveSliceFromPlate(plate);
sliceHash.Add(maxSlice.ID, maxSlice);
return(true);
}
return(false);
}
private PizzaSlice GetMaxSliceExtentionAt(int[,] plate, Dictionary <int, PizzaSlice> sliceHash, int row, int column, int nextSliceId)
{
PizzaSlice maxSlice = null;
int maxSliceIngredients = 0;
for (int minRow = row; minRow >= Math.Max(0, row - this.mMaxSliceSize); minRow--)
{
for (int maxRow = row; maxRow < Math.Min(row + this.mMaxSliceSize + 1, mRows); maxRow++)
{
for (int minCol = column; minCol >= Math.Max(0, column - this.mMaxSliceSize); minCol--)
{
for (int maxCol = column; maxCol < Math.Min(column + this.mMaxSliceSize + 1, mColumns); maxCol++)
{
int isValidSlice = IsValidSlice(this.mPlate, minRow, maxRow, minCol, maxCol);
if ((isValidSlice == CHECK_SLICE_TOO_BIG) || (isValidSlice == CHECK_SLICE_INVALID_SLICE))
{
break;
}
if (isValidSlice != CHECK_SLICE_VALID)
{
continue;
}
PizzaSlice newSlice = new PizzaSlice(nextSliceId, minRow, maxRow, minCol, maxCol);
// The new slice contains positions previously not in any slice
int newSliceIngredients = newSlice.CountIngredients(plate);
if (newSliceIngredients == 0)
{
continue;
}
// Check overlapping slices are still valid slices
Dictionary <int, int> sliceContent = newSlice.GetSliceContent(plate);
bool isValidOverlap = true;
foreach (int overlapSliceId in sliceContent.Keys)
{
if (overlapSliceId > 0)
{
continue;
}
PizzaSlice existingSlice = sliceHash[overlapSliceId];
PizzaSlice existingAfterOverlap = existingSlice.BuildShirnkedSliceWithOverlapping(newSlice);
if (existingAfterOverlap == null)
{
isValidOverlap = false;
break;
}
if (this.IsValidSlice(this.mPlate,
existingAfterOverlap.RowMin, existingAfterOverlap.RowMax,
existingAfterOverlap.ColumnMin, existingAfterOverlap.ColumnMax) != CHECK_SLICE_VALID)
{
isValidOverlap = false;
break;
}
}
if (isValidOverlap == false)
{
continue;
}
// Check if the new slice is bettter than existing max
if (maxSlice == null)
{
maxSlice = newSlice;
maxSliceIngredients = newSliceIngredients;
}
else if (maxSliceIngredients < newSliceIngredients)
{
maxSlice = newSlice;
maxSliceIngredients = newSliceIngredients;
}
}
}
}
}
return(maxSlice);
}
public PizzaSlice BuildShirnkedSliceWithOverlapping(PizzaSlice newSlice)
{
// Verify overlap is rect
if (
// Partial column overlap
((newSlice.ColumnMin > this.ColumnMin) || (newSlice.ColumnMax < this.ColumnMax))
&&
// Partial row overlap
((newSlice.RowMin > this.RowMin) || (newSlice.RowMax < this.RowMax))
)
{
return(null);
}
// Calc new overlapping slice
int existingNewRowMin = this.RowMin;
int existingNewRowMax = this.RowMax;
int existingNewColumnMin = this.ColumnMin;
int existingNewColumnMax = this.ColumnMax;
// Full column overlap
if ((newSlice.ColumnMin <= this.ColumnMin) && (newSlice.ColumnMax >= this.ColumnMax))
{
// New slice in the middle of old slice
if ((newSlice.RowMin > this.RowMin) && (newSlice.RowMax < this.RowMax))
{
return(null);
}
// Above
if (newSlice.RowMin <= this.RowMin)
{
existingNewRowMin = newSlice.RowMax + 1;
}
// Below
if (newSlice.RowMax >= this.RowMax)
{
existingNewRowMax = newSlice.RowMin - 1;
}
}
// Full row overlap
if ((newSlice.RowMin <= this.RowMin) && (newSlice.RowMax >= this.RowMax))
{
// New slice in the middle of old slice
if ((newSlice.ColumnMin > this.ColumnMin) && (newSlice.ColumnMax < this.ColumnMax))
{
return(null);
}
// Left
if (newSlice.ColumnMin <= this.ColumnMin)
{
existingNewColumnMin = newSlice.ColumnMax + 1;
}
// Right
if (newSlice.ColumnMax >= this.ColumnMax)
{
existingNewColumnMax = newSlice.ColumnMin - 1;
}
}
if (existingNewColumnMin > existingNewColumnMax)
{
return(null);
}
if (existingNewRowMin > existingNewRowMax)
{
return(null);
}
return(new PizzaSlice(this.ID, existingNewRowMin, existingNewRowMax, existingNewColumnMin, existingNewColumnMax));
}