Classes & dbPickObject - GameCreators Forum

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kklouzal

15

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Joined: 15th May 2009

Location: Arizona

Posted: 17th May 2009 13:02

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Heya. Me again. Maybe someone can explain how this is accomplished, or if there are better ways to accomplish this.

Heres what I have, I have a NPC class which holds, for now, some basic variables like int health and int modelnum.

When called, this class creates an object in the game, currently a square it holds the model number and passed to it the health.

I was wondering if I could use dbPickObject and through some means determine which class that object is part of, since dbPickObject returns an object number and the classes all store model numbers that this could be possible.

My brain is racking on this, i cant figure it out, there must be an easier way to do what im trying to do.

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jezza

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Joined: 8th Mar 2008

Location: Bham, UK

Posted: 17th May 2009 16:26

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inside all the classes could be a var of say an enum called Type.
if you had a void * array where the index is the model number, using dbPickObject you could do something like this:

+ Code Snippet

void *objects[1000];

enum OBJTYPE{
OBJ_LIL_EMENY=1,
OBJ_MATE=2
};

class enemy{
OBJTYPE type;//set as OBJ_LIL_EMENY
int hp;
};
class friend{
OBJTYPE type;//set as OBJ_MATE
int hp;
};

int objnum = dbPickObject();
//check what a picked object is
switch(objects[objnum]->type){
case OBJ_LIL_EMENY:
printf("Ahh! It's an enemy!");
break;
case OBJ_MATE:
printf("Hey man, long time no see");
break;
}

pdEngine - http://forum.thegamecreators.com/?m=forum_view&t=150417&b=8

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AndrewT

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Joined: 11th Feb 2007

Location: MI, USA

Posted: 17th May 2009 16:36

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Or you could reserve objects, say, 101 through 200 for a certain class, 201 through 300 for another, etc. and when you use pick object, you just check which range it is in and you know the class.

i like orange

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kklouzal

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Joined: 15th May 2009

Location: Arizona

Posted: 17th May 2009 23:31

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Alright! Perfect! =]

Thanks so much!

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kklouzal

15

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Joined: 15th May 2009

Location: Arizona

Posted: 18th May 2009 02:51

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Alright, I thought I understood how to use classes, let me show you what i'm doing:

NPC Class:

+ Code Snippet

class NPC {
public:
	int objnum;
	int health;
	NPC( int h, int x, int y, int z )
	{
		dbLoadObject ( "tiger.x", npcnum );
		health = h;
		objnum = npcnum;
		dbMakeObjectSphere( npcnum, 1 );
		dbPositionObject( npcnum, x, y, z );
		npcnum++;
	}
};

Now i'm trying to print something from the class:

+ Code Snippet

	if ( dbMouseClick() == 1 )
	{
		int selobj = dbPickObject(dbMouseX(),dbMouseY(),1,10);
		if ( selobj <= 500 && selobj >= 1000 )
		{
			int selh = NPC[selobj]::health;
			char stuff1 [ 256 ] = "NPC ID = ";
			strcat ( stuff1, dbStr ( selobj ) );
			dbText ( 0, 0, stuff1 );
			char stuff2 [ 256 ] = "NPC Health = ";
			strcat ( stuff2, dbStr ( selh ) );
			dbText ( 0, 10, stuff2 );
		}

Well I get a few errors when I try to compile:

+ Code Snippet

1>c:\users\administrator\desktop\3d rpg\3d rpg\3d rpg\functions.h(78) : error C2275: 'NPC' : illegal use of this type as an expression
1>        c:\users\administrator\desktop\3d rpg\3d rpg\3d rpg\classes.h(1) : see declaration of 'NPC'
1>c:\users\administrator\desktop\3d rpg\3d rpg\3d rpg\functions.h(78) : error C2039: 'health' : is not a member of '`global namespace''
1>c:\users\administrator\desktop\3d rpg\3d rpg\3d rpg\functions.h(78) : error C2146: syntax error : missing ';' before identifier 'health'
1>c:\users\administrator\desktop\3d rpg\3d rpg\3d rpg\functions.h(78) : error C2065: 'health' : undeclared identifier

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