Fruit Ninja- Style touch detection for multiple objects

Games
#1

Hey everybody,

so after a week I managed to get my first little app running on my own phone. Even as I am not programmer I am geek enough to feel a little pride there.

But here is the thing… I am NOT a programmer… so I guess I am doing a lot of overcomplicated stuff and now am not getting it to work for multiple objects.

Basically now I have an “enemy” consisting of a group with 2 objects. I let it randomly appear and disappear and when you use a swipe gesture over one of the picture I catch it via the a 

Runtime:addEventListener and calculate if during the move face the x and y coordinates collide with the x and y of the enemy.object1 before it disappears.

So far so good when I tried to spawn multiple enemies I used a table and would create a random number of enemies now when the function is called at the first time I would know how many enemies are on the display. But after a random number of seconds I destroy the old ones and create new ones in a higher index.

So lets say first time I create 3 and second time I create 3 then I have enemy[1]…enemy[2] etc.

also let’s say at the second time the first 3 are deleted so all currently exist is enemey[4],enemy[5] and enemy[6]

So here my question:

1.) Is there a better method to detect if the user has “hit”, used a touch gesture to hit one or multiple enemies

2.) Assuming my current method is correct… how do I know the index values of the table of the enemies that are currently displayed so I can get their position and see if they were hit?

I know that was a lot to read.

Thanks in advance.

-Gerd

#2

try this

http://docs.coronalabs.com/guide/events/touchMultitouch/index.html

#3

ok I solved the problem with the hit detection like this:

enemyGroup[i]:addEventListener(“touch”,function(event)

                  if (event.phase==“began” or event.phase==“moved”)then

                      deleteEnemy(i)

                  end

              end)

I was not aware that when I assign a touch listener to an object but the touch was started somewhere else it would still trigger… but when I pondered about the different phases of touch I thought why not give it a try and it works. Makes my code much easier.

#4

try this

http://docs.coronalabs.com/guide/events/touchMultitouch/index.html

#5

ok I solved the problem with the hit detection like this:

enemyGroup[i]:addEventListener(“touch”,function(event)

                  if (event.phase==“began” or event.phase==“moved”)then

                      deleteEnemy(i)

                  end

              end)

I was not aware that when I assign a touch listener to an object but the touch was started somewhere else it would still trigger… but when I pondered about the different phases of touch I thought why not give it a try and it works. Makes my code much easier.