qzdoom-gpl/src/g_shared/a_randomspawner.cpp

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#include "actor.h"
#include "info.h"
#include "m_random.h"
#include "p_local.h"
#include "p_enemy.h"
#include "s_sound.h"
#include "a_doomglobal.h"
#include "statnums.h"
#include "gstrings.h"
#include "a_action.h"
#include "thingdef/thingdef.h"
/*
- in the decorate definition define multiple drop items
- use the function GetDropItems to get the first drop item, then iterate over them and count how many dropitems are defined.
- with M_Random( ) % NUMBEROFDROPITEMS you get a random drop item number (let's call it n)
- use GetDropItems again to get the first drop item, then iterate to the n-th drop item
*/
static FRandom pr_randomspawn("RandomSpawn");
class ARandomSpawner : public AActor
{
DECLARE_CLASS (ARandomSpawner, AActor)
void PostBeginPlay()
{
AActor *newmobj;
FDropItem *di; // di will be our drop item list iterator
FDropItem *drop; // while drop stays as the reference point.
int n=0;
Super::PostBeginPlay();
drop = di = GetDropItems(RUNTIME_TYPE(this));
// Always make sure it actually exists.
if (di != NULL)
{
// First, we get the size of the array...
while (di != NULL)
{
if (di->Name != NAME_None)
{
if (di->amount < 0) di->amount = 1; // default value is -1, we need a positive value.
n += di->amount; // this is how we can weight the list.
di = di->Next;
}
}
// Then we reset the iterator to the start position...
di = drop;
// Take a random number...
n = pr_randomspawn(n);
// And iterate in the array up to the random number chosen.
while (n > 0)
{
if (di->Name != NAME_None)
{
n -= di->amount;
if (di->Next != NULL) di = di->Next; else n=0;
}
}
// So now we can spawn the dropped item.
if (pr_randomspawn() <= di->probability) // prob 255 = always spawn, prob 0 = never spawn.
{
newmobj = Spawn(di->Name, x, y, z, ALLOW_REPLACE);
// copy everything relevant
newmobj->SpawnAngle = newmobj->angle = angle;
newmobj->special = special;
newmobj->args[0] = args[0];
newmobj->args[1] = args[1];
newmobj->args[2] = args[2];
newmobj->args[3] = args[3];
newmobj->args[4] = args[4];
newmobj->SpawnFlags = SpawnFlags;
newmobj->HandleSpawnFlags();
newmobj->tid = tid;
newmobj->AddToHash();
newmobj->momx = momx;
newmobj->momy = momy;
newmobj->momz = momz;
newmobj->CopyFriendliness(this, false);
}
}
Destroy();
}
};
IMPLEMENT_CLASS (ARandomSpawner)