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new cvar_pump_active;
new cvar_pump_force;
Float:operator*(Float:,_:)(Float:oper1, oper2)
{
return floatmul(oper1, float(oper2));
}

Float:operator/(Float:,_:)(Float:oper1, oper2)
{
return floatdiv(oper1, float(oper2));
}

bool:operator>(Float:,Float:)(Float:oper1, Float:oper2)
{
return 0 < floatcmp(oper1, oper2);
}

bool:operator<=(Float:,Float:)(Float:oper1, Float:oper2)
{
return 0 >= floatcmp(oper1, oper2);
}

get_entity_distance(ent1, ent2)
{
new Float:orig1[3] = 0.0;
new Float:orig2[3] = 0.0;
entity_get_vector(ent1, cvar_pump_active, orig1);
entity_get_vector(ent2, cvar_pump_active, orig2);
return floatround(get_distance_f(orig1, orig2), cvar_pump_active);
}

set_user_velocity(entity, Float:vec[3])
{
return entity_set_vector(entity, 2, vec);
}

get_user_velocity(entity, Float:vec[3])
{
return entity_get_vector(entity, 2, vec);
}

public plugin_init()
{
register_plugin("Pump Knockback (when shot by one)", "1.0", "v3x & Chronic");
register_event("Damage", "event_Damage", 296, "2>0");
cvar_pump_active = register_cvar("pump_knockback", 380, cvar_pump_active, cvar_pump_active);
cvar_pump_force = register_cvar("pump_force", "10", cvar_pump_active, cvar_pump_active);
return 0;
}

public event_Damage(id)
{
if (!get_pcvar_num(cvar_pump_active))
{
return 0;
}
if (!is_user_alive(id))
{
return 0;
}
new weapon;
new attacker = get_user_attacker(id, weapon);
if (!is_user_alive(attacker))
{
return 0;
}
if (weapon == 21)
{
new Float:vec[3] = 0.0;
new Float:oldvelo[3] = 0.0;
get_user_velocity(id, oldvelo);
create_velocity_vector(id, attacker, vec);
vec[0] = floatadd(vec[0], oldvelo[0]);
new var1 = vec[1];
var1 = floatadd(var1, oldvelo[1]);
set_user_velocity(id, vec);
}
return 0;
}

create_velocity_vector(victim, attacker, Float:velocity[3])
{
new var1;
if (!is_user_alive(victim) || !is_user_alive(attacker))
{
return 0;
}
new Float:vicorigin[3] = 0.0;
new Float:attorigin[3] = 0.0;
entity_get_vector(victim, cvar_pump_active, vicorigin);
entity_get_vector(attacker, cvar_pump_active, attorigin);
new Float:origin2[3] = 0.0;
origin2[0] = floatsub(vicorigin[0], attorigin[0]);
origin2[1] = floatsub(vicorigin[1], attorigin[1]);
new Float:largestnum = 0.0;
if (floatabs(origin2[0]) > largestnum)
{
largestnum = floatabs(origin2[0]);
}
if (floatabs(origin2[1]) > largestnum)
{
largestnum = floatabs(origin2[1]);
}
origin2[0] = floatdiv(origin2[0], largestnum);
new var3 = origin2[1];
var3 = floatdiv(var3, largestnum);
velocity[0] = floatmul(origin2[0], get_pcvar_float(cvar_pump_force) * 3000) / get_entity_distance(victim, attacker);
velocity[1] = floatmul(origin2[1], get_pcvar_float(cvar_pump_force) * 3000) / get_entity_distance(victim, attacker);
new var2;
if (velocity[0] <= 20.0 || velocity[1] <= 20.0)
{
velocity[2] = random_float(1128792064, 1133084672);
}
return 1;
}