private ItemMovementDetails MoveItemToNullPositionAndCheckIfSameWithNextOne
(int oldRow, int newRow, int itemToCheckRow, int oldColumn, int newColumn, int itemToCheckColumn)
{
matrix[newRow, newColumn] = matrix[oldRow, oldColumn];
matrix[oldRow, oldColumn] = null;
ItemMovementDetails imd2 = AreTheseTwoItemsSame(newRow, newColumn, itemToCheckRow,
itemToCheckColumn);
if (imd2 != null)
{
return(imd2);
}
else
{
return
(new ItemMovementDetails(newRow, newColumn, matrix[newRow, newColumn].GO, null));
}
}
private ItemMovementDetails MoveItemToNullPositionAndCheckIfSameWithNextOne
(int oldRow, int newRow, int itemToCheckRow, int oldColumn, int newColumn, int itemToCheckColumn)
{
//we found a null item, so we attempt the switch ;)
//bring the first not null item to the position of the first null one
matrix[newRow, newColumn] = matrix[oldRow, oldColumn];
matrix[oldRow, oldColumn] = null;
//check if we have the same value as the left one
ItemMovementDetails imd2 = AreTheseTwoItemsSame(newRow, newColumn, itemToCheckRow,
itemToCheckColumn);
if (imd2 != null)//we have, so add the item returned by the method
{
return(imd2);
}
else//they are not the same, so we'll just animate the current item to its new position
{
return
(new ItemMovementDetails(newRow, newColumn, matrix[newRow, newColumn].GO, null));
}
}
public List <ItemMovementDetails> MoveHorizontal(HorizontalMovement horizontalMovement)
{
ResetWasJustDuplicatedValues();
var movementDetails = new List <ItemMovementDetails>();
//the relative column we will compare with
//if swipe is left, we will compare with the previous one (the -1 position)
int relativeColumn = horizontalMovement == HorizontalMovement.Left ? -1 : 1;
//to get the column indexes, to do the loop below
var columnNumbers = Enumerable.Range(0, Globals.Columns);
//for left swipe, we will traverse the columns in the order 0,1,2,3
//for right swipe, we want the reverse order
if (horizontalMovement == HorizontalMovement.Right)
{
columnNumbers = columnNumbers.Reverse();
}
for (int row = Globals.Rows - 1; row >= 0; row--)
{ //we're doing foreach instead of for in order to traverse the columns
//in the appropriate order
foreach (int column in columnNumbers)
{
//if the item is null, continue checking for non-null items
if (matrix[row, column] == null)
{
continue;
}
//since we arrived here, we have a non-null item
//first we check if this item has the same value as the previous one
//previous one's position depends on whether the relativeColumn variable is -1 or 1, depending on the swipe
ItemMovementDetails imd = AreTheseTwoItemsSame(row, column, row, column + relativeColumn);
if (imd != null)
{
//items have the same value, so they will be "merged"
movementDetails.Add(imd);
//continue the loop
//the new duplicated item may be moved on a subsequent loop
continue;
}
//matrix[row,column] is the first not null item
//move it to the first null item space
int columnFirstNullItem = -1;
//again, this is to help on the foreach loop that follows
//for a left swipe, we want to check the columns 0 to [column-1]
//for a right swipe, we want to check columns [Globals.Columns-1] to column
int numberOfItemsToTake = horizontalMovement == HorizontalMovement.Left
? column : Globals.Columns - column;
bool emptyItemFound = false;
//keeping it for documentation/clarity
//this for loop would run for a left swipe ;)
//for (columnFirstNullItem = 0; columnFirstNullItem < column; columnFirstNullItem++)
foreach (var tempColumnFirstNullItem in columnNumbers.Take(numberOfItemsToTake))
{
//keep a copy of the index on the potential null item position
columnFirstNullItem = tempColumnFirstNullItem;
if (matrix[row, columnFirstNullItem] == null)
{
emptyItemFound = true;
break;//exit the loop
}
}
//we did not find an empty/null item, so we cannot move current item
if (!emptyItemFound)
{
continue;
}
ItemMovementDetails newImd =
MoveItemToNullPositionAndCheckIfSameWithNextOne
(row, row, row, column, columnFirstNullItem, columnFirstNullItem + relativeColumn);
movementDetails.Add(newImd);
}
}
return(movementDetails);
}
public List <ItemMovementDetails> MoveVertical(VerticalMovement verticalMovement)
{
ResetWasJustDuplicatedValues();
var movementDetails = new List <ItemMovementDetails>();
int relativeRow = verticalMovement == VerticalMovement.Bottom ? -1 : 1;
var rowNumbers = Enumerable.Range(0, Globals.Rows);
if (verticalMovement == VerticalMovement.Top)
{
rowNumbers = rowNumbers.Reverse();
}
for (int column = 0; column < Globals.Columns; column++)
{
foreach (int row in rowNumbers)
{
//if the item is null, continue checking for non-null items
if (matrix[row, column] == null)
{
continue;
}
//we have a non-null item
//first we check if this item has the same value as the next one
ItemMovementDetails imd = AreTheseTwoItemsSame(row, column, row + relativeRow, column);
if (imd != null)
{
movementDetails.Add(imd);
continue;
}
//matrix[row,column] is the first not null item
//move it to the first null item
int rowFirstNullItem = -1;
int numberOfItemsToTake = verticalMovement == VerticalMovement.Bottom
? row : Globals.Rows - row;
bool emptyItemFound = false;
foreach (var tempRowFirstNullItem in rowNumbers.Take(numberOfItemsToTake))
{
rowFirstNullItem = tempRowFirstNullItem;
if (matrix[rowFirstNullItem, column] == null)
{
emptyItemFound = true;
break;
}
}
if (!emptyItemFound)
{
continue;
}
ItemMovementDetails newImd =
MoveItemToNullPositionAndCheckIfSameWithNextOne(row, rowFirstNullItem, rowFirstNullItem + relativeRow, column, column, column);
movementDetails.Add(newImd);
}
}
return(movementDetails);
}
public List <ItemMovementDetails> MoveHorizontal(HorizontalMovement horizontalMovement)
{
ResetWasJustDuplicatedValues();
var movementDetails = new List <ItemMovementDetails>();
int relativeColumn = horizontalMovement == HorizontalMovement.Left ? -1 : 1;
var columnNumbers = Enumerable.Range(0, Globals.Columns);
if (horizontalMovement == HorizontalMovement.Right)
{
columnNumbers = columnNumbers.Reverse();
}
for (int row = Globals.Rows - 1; row >= 0; row--)
{
foreach (int column in columnNumbers)
{
if (matrix[row, column] == null)
{
continue;
}
ItemMovementDetails imd = AreTheseTwoItemsSame(row, column, row, column + relativeColumn);
if (imd != null)
{
movementDetails.Add(imd);
continue;
}
int columnFirstNullItem = -1;
int numberOfItemsToTake = horizontalMovement == HorizontalMovement.Left
? column : Globals.Columns - column;
bool emptyItemFound = false;
foreach (var tempColumnFirstNullItem in columnNumbers.Take(numberOfItemsToTake))
{
columnFirstNullItem = tempColumnFirstNullItem;
if (matrix[row, columnFirstNullItem] == null)
{
emptyItemFound = true;
break;
}
}
if (!emptyItemFound)
{
continue;
}
ItemMovementDetails newImd =
MoveItemToNullPositionAndCheckIfSameWithNextOne
(row, row, row, column, columnFirstNullItem, columnFirstNullItem + relativeColumn);
movementDetails.Add(newImd);
}
}
return(movementDetails);
}
