Time for action – swapping the gems and looking for matches

The swapping logic is found in GameScene in the swapGemsToNewPosition method:

1. The swapGemsToNewPosition method makes one call to GridAnimations to animate the swap between the selected and target gem. Once this animation is complete, we fire a onNewSwapComplete method. The majority of the logic takes place in there:

   function GameScene:swapGemsToNewPosition ()
       local function onMatchedAnimatedOut (sender)
           self:collapseGrid()
       end
     
       local function onReturnSwapComplete (sender)
           self.gridController.enabled = true
       end
   
       local function onNewSwapComplete (sender)
          self.gridGemsColumnMap[self.targetIndex.x][self.targetIndex.y]  = self.selectedGem
           self.gridGemsColumnMap[self.selectedIndex.x][self.selectedIndex.y] =  self.targetGem
           self.grid[self.targetIndex.x][self.targetIndex.y] =  self.selectedGem.type
           self.grid[self.selectedIndex.x][self.selectedIndex.y] =  self.targetGem...