Adventure Game Studio

I think is complecated!! I used AGS 3.1
The question:
I have a room and in the room a object " a ball" (1) to pick up. I will that the character can pick up the object "ball" (1), only if, after the character give a inventory item (bombom) to a  object "cat" (2), and the cat move in a new position, the character can pick up the object "ball" (1), else the character say "I can't pick up". How can solve??
I've think for a "set global" or a "Object.GetAtScreenXY" or there is aanother command the I know??
My code:
\\ character give inventory item (bombom)  and the object "cat" (2) move to a new position
if (UsedAction (A_USE_INV)){
  if (MovePlayer (301, 95)) {
   FaceDirection (player.ID, DIR_RIGHT);
   Wait (5);
  PlaySound(35);
       character[16].LoseInventory(iInventory14);
   object[1].SetView(52, 0);
while (object[1].Moving) Wait(20);
object[1].Animate(0, 1, eRepeat, eNoBlock);
object[1].Move(360, 80, 1, eBlock, eAnywhere);
object[1].StopAnimating();
object[1].SetView(50, 0);
while (object[1].Moving) Wait(20);
object[1].Animate(0, 1, eRepeat, eNoBlock);

\\character pick up a object " a ball" (1)    "the code  is incomplete"

if (UsedAction (A_PICK_UP)) {
 if (MovePlayer (325,134)){
\\ must I put a "set global" or a "Object.GetAtScreenXY" command??
   FaceDirection (GetPlayerCharacter (), DIR_RIGHT);
   Wait (5);
   AddInventory (10);
   PlaySound (4);
   ObjectOff (0);
   }
   else {
     DisplaySpeech(GetPlayerCharacter(), "I can't pick up.");
 }
}


HELP ???

Open the Global variables pane, then create a new bool variable. Name it "cat_has_bombom" and set its initial value to false.

After you gave the bombom to the cat, use
  cat_has_bombom = true;

When the player tries to pick up the ball:
  if (cat_has_bombom) {
    // player picks up ball here
  }
  else {
    player.Say("I can't pick up the ball.");
  }

(Older versions of AGS used SetGlobalInt() and GetGlobalInt() to do the same thing; best forget about those as quickly as possible :))

Also, PLEASE use [code] tags and indent your code properly.

Thanks Chris for your HELP! Very Great!!
I've see that the new version of AGS is great!! (I've study bool variable ;D).
But there is also something that dosn't work!!
The code work in part....I've set bool and...
At first, when I pick up the ball....not work
After give bombom cat I pick the ball...work
mmmmm....what is wrong??

After Char give the bombom to the cat,  I've used code:

Code:
if (UsedAction (A_USE_INV)){
 if (MovePlayer (301, 95)) {
   FaceDirection (player.ID, DIR_RIGHT);
   Wait (5);
       PlaySound(35);
       character[16].LoseInventory(iInventory14);
      cat_has_bombom = true; \\ here I've just lose inventory item 14 (giving bombom)
    object[1].SetView(52, 0);
while (object[1].Moving) Wait(20);
object[1].Animate(0, 1, eRepeat, eNoBlock);
object[1].Move(360, 80, 1, eBlock, eAnywhere);
object[1].StopAnimating();
object[1].SetView(50, 0);
while (object[1].Moving) Wait(20);
object[1].Animate(0, 1, eRepeat, eNoBlock);  

Char pick up:
if (UsedAction (A_PICK_UP)) {
 if (cat_has_bombom) {
 if (MovePlayer (325,134)){
   FaceDirection (GetPlayerCharacter (), DIR_RIGHT);
   Wait (5);
   AddInventory (10);
   PlaySound (4);
   ObjectOff (0);
   Wait (5);
   player.Say("A ball.");
   }
   else {
     player.Say("I can't pick up the ball.");

So, what doesn't work?

I thought this is what you wanted, the player can't pick up the ball, only after they gave the bombom to the cat.

Here's how you're supposed to code it:

  if (UsedAction(A_PICK_UP)) {

    // always move the player to the ball
    if (MovePlayer(325, 134)) {
      FaceDirection(player.ID, DIR_RIGHT);
      Wait(5);

      if (cat_has_bombom) {
        player.AddInventory(10);
        PlaySound(4);
        oBall.Visible = false;            // you can use a name instead of object[0]
        Wait(5);
        player.Say("A ball.");
      }
      else {
        player.Say("I can't pick up the ball.");
      }
    }
  }

Great!! :D
Thanks Chris