NPC2

const NPC_LAYER =2;//Has to be layer 2 or 1.
					//Used to affect solidity

// FFC script for talking NPCs with different functions
// It's pretty much a sign you can approach from any side.
// D0: String number to be displayed
// D1: Item for interaction
//     If positive, npc persists until you have the item
//     If Negative, npc doesn't appear until you have the item
//
// D2: Screen->D register to store information in.
//     A number between 0-7 unique for each npc on screen
//
// D3: Whether screen secrets are triggered after talking to this npc

ffc script altnpcscript{
    void run(int string, int item_req, int perm,bool secret){
	// So that people don't have to be pixel perfect on placing npcs.
		//Used for determining what combo to change
		int loc= ComboAt(this->X,this->Y);
		//Remember what combo was here before
		int this_combo= Screen->D[loc];
		//Remember the npc's appearance if it is supposed to be invisible until you have an item
		int store_combo= this->Data;
		//NPC appears until you have an item
		if(item_req>0){
			//You don't have the item
			if(!Link->Item[item_req]){
				//Set the combo on layer one at this position
				//To whatever was here before
				SetLayerComboD(NPC_LAYER-1,loc,this_combo);
				//Set the combo here on layer 2 to the npc's data
				SetLayerComboD(NPC_LAYER,loc,this->Data);
			}
			else
				SetLayerComboD(NPC_LAYER,loc,GetLayerComboD(NPC_LAYER-1,loc));
				//Once you have the item, change the combo at this position
				//Uses the stored combo on layer 1 to determine what to put here
		}
		else if(item_req<0){
			//Npc is invisible until you have the item
			this->Data= GH_INVISIBLE_COMBO;
			//Do nothing until you have the item
			while(!Link->Item[item_req])
				Waitframe();
			//Restore npc appearance
			this->Data = store_combo;
			//Change the combo on layer 2 to npc data to affect solidity
			SetLayerComboD(NPC_LAYER,loc,this->Data);
		}
	//When placed here, no errors manifest
	//int LinkX;
	//int LinkY;
	//int centerX;
	//int centerY;
        while(true){
		//When placed here, they do
		// Set up some values to make the if statement smaller.
			int LinkX = Link->X + 8;
			int LinkY = Link->Y + 8;
			int centerX = this->X + this->EffectWidth / 2;
			int centerY = this->Y + this->EffectHeight / 2;
			// If Link is on one of the sides of the NPC and facing it
			if(
				((Abs(LinkX - centerX) < this->EffectWidth / 2
					&& Abs(LinkY - centerY) <= this->EffectHeight / 2 + 12
					&& LinkY < centerY && Link->Dir == DIR_DOWN) ||
					(Abs(LinkX - centerX) < this->EffectWidth / 2
					&& Abs(LinkY - centerY) <= this->EffectHeight / 2 + 4
					&& LinkY > centerY && Link->Dir == DIR_UP) ||
					(Abs(LinkY + 3 - centerY) < this->EffectHeight / 2
					&& Abs(LinkX - centerX) <= this->EffectWidth / 2 + 12
					&& LinkX < centerX && Link->Dir == DIR_RIGHT) ||
					(Abs(LinkY + 3- centerY) < this->EffectHeight / 2
					&& Abs(LinkX - centerX) <= this->EffectWidth / 2 + 12
					&& LinkX > centerX && Link->Dir == DIR_LEFT))){
				if(Link->PressEx1){
					Link->InputEx1=false;
					Screen->Message(string);
					if(Screen->D[perm]==0){
						//This is so that any string control codes which read Screen->D aren't
						//immediately triggered
						Waitframes(5);
						//Set screen D register
						Screen->D[perm]=1;
						//Trigger secrets
						if(secret){
							Screen->TriggerSecrets();
							Screen->State[ST_SECRET]= true;
						}
					}
				}
			}
		    Waitframe();
        } // End of while(true)
    } // End of void run(int message)
} // End of ffc script npcscript