Time for action — enhancing the OnObjectTouch method

The OnObjectTouch method is updated as follows:

First add two FLOAT variables at the start which will store the difference factor regarding objects positions.
```
Method OnObjectTouch:Int(obj:ftObject, touchId:Int)
Local xdiff:Float
Local ydiff:Float
```
Check if game mode is equal to the constant g.gmMenu.
```
If g.gameMode = g.gmMenu Then
```
Start the Select statement on the object's Tag property.
```
Select obj.GetTag()
```
Check against the constant g.btnPlay (the play button). If yes, then start a new game.
```
Case g.btnPlay
g.StartNewGame()
```
Check against the constant g.btnScore (the score button). If yes, then show the high-score screen.
```
Case g.btnScore
g.ShowScore
```
Check against the constant g.btnExit (the exit button). If yes, then exit the app.
```
Case g.btnExit
g.eng.ExitApp(True)
```
Close the Select statement. After that, play the g.sndSelect sound and close the IF statement.
```
End
g.sndSelect.Play()
Endif
```
Now comes the part where we check if a gem was selected and if it can move.
Start an IF check. Check that the game mode is set to g.gmPlay, that there are no transitions in the game layer, that the touch ID is not 99, and that justStarted is not True.
```
If g.gameMode = g.gmPlay And g.layerGame.GetObjTransCount() = 0 And touchId <> 99 And g.justStarted = False Then
```

Check if the first tile was selected before.

If g.firstTile <> Null Then
Get the X/Y distance of the first tile and the current one
xdiff = g.firstTile.GetPosX() - obj.GetPosX()
ydiff = g.firstTile.GetPosY() - obj.GetPosY()

Check if the tile is the neighboring one. We do this by comparing the absolute differences between the x and y positions.
```
If ((Abs(xdiff)<80.0) And (Abs(ydiff)<2.0)) Or ((Abs(ydiff)<80.0) And (Abs(xdiff)<2.0)) Then
```
Set the second tile to the current object.
```
g.secondTile = obj
```

Now, check if there are at least two neighboring tiles of the same kind.

If (g.CountGems(g.firstTile, g.secondTile)>1) Or (g.CountGems(g.secondTile, g.firstTile)>1) Then

Initialize both tile slots

g.SetSlotTile(g.GetSlotX(g.secondTile), g.GetSlotY(g.secondTile),-1)
g.SetSlotTile(g.GetSlotX(g.firstTile), g.GetSlotY(g.firstTile),-1)

Transform these tiles to their opposite coordinates and close the IF check.

g.firstTile.CreateTransPos(g.secondTile.GetPosX(),g.secondTile.GetPosY(),300,False,99)
g.secondTile.CreateTransPos(g.firstTile.GetPosX(),g.firstTile.GetPosY(),300,False,99)
Endif

Initialize the first and second tile objects.
```
g.secondTile = Null
g.firstTile = Null
```
Place the tile selector outside the map so it can't be detected by the touch check.
```
g.selector.SetPos(0, 0)
g.selector.SetVisible(False)
Else
```
There are no neighboring tiles, so initialize the first tile and make the selector invisible.
```
g.firstTile = Null
g.selector.SetPos(0, 0)
g.selector.SetVisible(False)
```
Play the g.sndFalse sound.
```
g.sndFalse.Play()
Endif
Else
```
The first tile was selected, so make the selector visible and set it to the position of the current tile. After that, close the two IF checks.
```
g.firstTile = obj
g.selector.SetPos(obj.GetPosX(), obj.GetPosY())
g.selector.SetVisible(True)
Endif
Endif
```

If the game mode is g.gmPlay and the touch ID is 99, then raise the value of score by 100, spawn an explosion, and remove the tile.

If g.gameMode = g.gmPlay And touchId = 99 Then
g.score += 100
SpawnExplosion(7,obj.GetPosX(), obj.GetPosY())
obj.Remove()
Endif

Tell the game that the first frame was displayed. This is important because it somehow will set the selector wrong.
```
g.justStarted = False
```

Check if the Back button was selected.

If obj.GetTag() = g.btnBack Then g.ShowMenu()
Return 0
End

What just happened?

Now that we have handled the touch events, all buttons are functional, and you can start a new game. You can also select the first two tiles. We still need to handle the transition and the winning conditions of the game, so let's go further.

We've reached our parking position… a transition is done

After both the selected gems have moved, something has to happen. That would be setting the slot IDs for the new gems and also checking if matching gems can be removed.

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Table of Contents for Time for action — enhancing the OnObjectTouch method

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Time for action — enhancing the OnObjectTouch method

What just happened?

We've reached our parking position… a transition is done

Table of Contents for
Time for action — enhancing the OnObjectTouch method