A_SetTargetsTarget is an action that changes the actor's target to the Object its current target is itself targeting – i.e. the actor's new target will become the same as its old target's own target. This action can use tracer Objects instead of target Objects where applicable: Var1 determines whether to use the actor's target (Var1 = 0) or tracer (Var1 = 1), while Var2 determines whether to use the target (Var2 = 0) or tracer (Var2 = 1) of the Object determined by Var1. This results in four possible ways this action can function:
| Var1
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Var2
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Effect
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| 0
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0
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actor's new target = old target's target
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| 1
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actor's new target = old target's tracer
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| 1
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0
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actor's new tracer = old tracer's target
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| 1
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actor's new tracer = old tracer's tracer
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If the actor doesn't have a target/tracer, or the actor's target/tracer doesn't have a target/tracer of its own, this action will do nothing.
Code – A_SetTargetsTarget
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// Function: A_SetTargetsTarget
//
// Description: Sets your target to the object who your target is targeting. Yikes! If it happens to be NULL, you're just out of luck.
//
// var1: (Your target)
// 0 = target
// 1 = tracer
// var2: (Your target's target)
// 0 = target/tracer's target
// 1 = target/tracer's tracer
//
void A_SetTargetsTarget(mobj_t *actor)
{
INT32 locvar1 = var1;
INT32 locvar2 = var2;
mobj_t *oldtarg = NULL, *newtarg = NULL;
#ifdef HAVE_BLUA
if (LUA_CallAction("A_SetTargetsTarget", actor))
return;
#endif
// actor's target
if (locvar1) // or tracer
oldtarg = actor->tracer;
else
oldtarg = actor->target;
if (P_MobjWasRemoved(oldtarg))
return;
// actor's target's target!
if (locvar2) // or tracer
newtarg = oldtarg->tracer;
else
newtarg = oldtarg->target;
if (P_MobjWasRemoved(newtarg))
return;
// set actor's new target
if (locvar1) // or tracer
P_SetTarget(&actor->tracer, newtarg);
else
P_SetTarget(&actor->target, newtarg);
}
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