A_SpikeRetract is an action that is used to toggle on or off the solidity of spikes, depending on the value of Var1: if Var1 is 0, MF_SOLID is removed from the actor's flags and MF_NOCLIPTHING is added to them; when Var1 is any other value, MF_NOCLIPTHING is removed from the actor's flags and MF_SOLID is added to them. Note that in the latter case, P_CheckPosition is also called by this action to ensure other Objects can collide with the actor afterwards during the same tic.
If the actor's flags have MF_NOBLOCKMAP, this action will do nothing.
Code – A_SpikeRetract
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// Function: A_SpikeRetract
//
// Description: Toggles actor solid flag.
//
// var1:
// if var1 == 0, actor no collide
// else, actor solid
// var2 = unused
//
void A_SpikeRetract(mobj_t *actor)
{
INT32 locvar1 = var1;
#ifdef HAVE_BLUA
if (LUA_CallAction("A_SpikeRetract", actor))
return;
#endif
if (actor->flags & MF_NOBLOCKMAP)
return;
if (locvar1 == 0)
{
actor->flags &= ~MF_SOLID;
actor->flags |= MF_NOCLIPTHING;
}
else
{
actor->flags |= MF_SOLID;
actor->flags &= ~MF_NOCLIPTHING;
}
if (actor->flags & MF_SOLID)
P_CheckPosition(actor, actor->x, actor->y);
}
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