#include <sdktools>

new Handle:cvarRadius;
new Handle:cvarMagnitude;

int g_sprite = 0;

...

public OnPluginStart()
{
    cvarRadius = CreateConVar("sm_rocketguns_radius", "150", "Radius of the explosions.", 0, true, 150.0, false, _);
    cvarMagnitude = CreateConVar("sm_rocketguns_magnitude", "300", "Magnitude of the explosions.", 0, true, 300.0, false, _);
    AutoExecConfig(true, "rocket_guns");

    HookEvent("bullet_impact", Event_BulletImpact, EventHookMode_Pre);    
}

public OnMapStart()
{
    g_sprite = PrecacheGeneric("sprites/zerogxplode.spr", true);
}

public Action Event_BulletImpact(Handle:event, const String:name[], bool:dontBroadcast)
{
    new client = GetClientOfUserId(GetEventInt(event, "userid"));
    if (!IsClientInGame(client))
  return;

    new Float:origin[3];
    origin[0] = GetEventFloat(event, "x");
    origin[1] = GetEventFloat(event, "y");
    origin[2] = GetEventFloat(event, "z");

    new Float:ClientOrigin[3];
    GetClientAbsOrigin(client, ClientOrigin);

    char weapon[32];
    GetClientWeapon(client, weapon, sizeof(weapon));

    if (StrContains("weapon_deagle", weapon) != -1)
    {
  new radius = GetConVarInt(cvarRadius);
  new magnitude = GetConVarInt(cvarMagnitude);

  char s_radius[32];
  char s_magnitude[32];
  IntToString(radius, s_radius, sizeof(s_radius));
  IntToString(magnitude, s_magnitude, sizeof(s_magnitude));

  new entity = CreateEntityByName("env_explosion");
  DispatchKeyValueVector(entity, "origin", origin);
  DispatchKeyValue(entity, "imagnitude", s_magnitude);
  DispatchKeyValue(entity, "iradiusoverride", s_radius);
  DispatchKeyValue(entity, "spawnflags", "0");
  SetEntPropEnt(entity, Prop_Send, "m_hOwnerEntity", client);

  DispatchSpawn(entity);
  AcceptEntityInput(entity, "Explode");

  TE_SetupExplosion(origin, g_sprite, 1.0, 10, TE_EXPLFLAG_NONE, radius, magnitude);
  TE_SendToAll();
    }
}