AMXX.pl: Support AMX Mod X i SourceMod

/* AMX Mod script.
*
* HE-CONC 1.0
*  by ThantiK
*
*
* Description:
*  Remember CONC jumping in TFC? -- This adds the knockback to the HE 'nades
*  its great to set higher or lower depending on your wants.  But definately
*  adds some spunk to the game.
*  
* Commands:
*  CVAR - he_push, set higher or lower depending on the effect you want.
*
* Special Thanks:
*  JGHG for the help with setting velocity, and for the code on getting HE coords.
*  Ryan (War3 Expansion guy) for the mathematics and velocity stocks.
*/

#include <amxmodx>
#include <amxmisc>
#include <engine>

#define SPEED 800.0

public plugin_init() {
	register_plugin("HE Knockback", "1.0", "ThantiK")
	register_event("Damage", "hedamage_event", "b", "2!0", "4!0", "5!0", "6!0")
	register_cvar("he_push","20.0")
}

stock get_velocity_from_origin( ent, Float:fOrigin[3], Float:fSpeed, Float:fVelocity[3] )
{
	new Float:fEntOrigin[3];
	entity_get_vector( ent, EV_VEC_origin, fEntOrigin );

	// Velocity = Distance / Time

	new Float:fDistance[3];
	fDistance[0] = fEntOrigin[0] - fOrigin[0];
	fDistance[1] = fEntOrigin[1] - fOrigin[1];
	fDistance[2] = fEntOrigin[2] - fOrigin[2];

	new Float:fTime = ( vector_distance( fEntOrigin,fOrigin ) / fSpeed );

	fVelocity[0] = fDistance[0] / fTime;
	fVelocity[1] = fDistance[1] / fTime;
	fVelocity[2] = fDistance[2] / fTime;

	return ( fVelocity[0] && fVelocity[1] && fVelocity[2] );
}


// Sets velocity of an entity (ent) away from origin with speed (speed)

stock set_velocity_from_origin( ent, Float:fOrigin[3], Float:fSpeed )
{
	new Float:fVelocity[3];
	get_velocity_from_origin( ent, fOrigin, fSpeed, fVelocity )

	entity_set_vector( ent, EV_VEC_velocity, fVelocity );

	return ( 1 );
}

public hedamage_event(id) {
	new MAXPLAYERS
	MAXPLAYERS = get_maxplayers()

	new inflictor = entity_get_edict(id, EV_ENT_dmg_inflictor)
	if (inflictor <= MAXPLAYERS)
		return PLUGIN_CONTINUE

	new classname2[8]
	entity_get_string(inflictor, EV_SZ_classname, classname2, 7)
	if (!equal(classname2, "grenade"))
		return PLUGIN_CONTINUE

	new Float:upVector[3]
	upVector[0] = float(read_data(4))
	upVector[1] = float(read_data(5))
	upVector[2] = float(read_data(6))

	new damagerept = read_data(2)
	set_velocity_from_origin(id, upVector, get_cvar_float("he_push")*damagerept)

	return PLUGIN_CONTINUE
}