gamecombat.java

Jake2是一个Java 3D游戏引擎.

/*
Copyright (C) 1997-2001 Id Software, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

// Created on 16.11.2005 by RST.
// $Id: GameCombat.java,v 1.3 2006/01/21 21:53:32 salomo Exp $

package jake2.game;

import jake2.Defines;
import jake2.Globals;
import jake2.qcommon.Com;
import jake2.util.Math3D;

public class GameCombat {

    /**
     * CanDamage
     * 
     * Returns true if the inflictor can directly damage the target. Used for
     * explosions and melee attacks.
     */
    static boolean CanDamage(edict_t targ, edict_t inflictor) {
        float[] dest = { 0, 0, 0 };
        trace_t trace;
    
        // bmodels need special checking because their origin is 0,0,0
        if (targ.movetype == Defines.MOVETYPE_PUSH) {
            Math3D.VectorAdd(targ.absmin, targ.absmax, dest);
            Math3D.VectorScale(dest, 0.5f, dest);
            trace = GameBase.gi.trace(inflictor.s.origin, Globals.vec3_origin,
                    Globals.vec3_origin, dest, inflictor, Defines.MASK_SOLID);
            if (trace.fraction == 1.0f)
                return true;
            if (trace.ent == targ)
                return true;
            return false;
        }
    
        trace = GameBase.gi.trace(inflictor.s.origin, Globals.vec3_origin,
                Globals.vec3_origin, targ.s.origin, inflictor,
                Defines.MASK_SOLID);
        if (trace.fraction == 1.0)
            return true;
    
        Math3D.VectorCopy(targ.s.origin, dest);
        dest[0] += 15.0;
        dest[1] += 15.0;
        trace = GameBase.gi.trace(inflictor.s.origin, Globals.vec3_origin,
                Globals.vec3_origin, dest, inflictor, Defines.MASK_SOLID);
        if (trace.fraction == 1.0)
            return true;
    
        Math3D.VectorCopy(targ.s.origin, dest);
        dest[0] += 15.0;
        dest[1] -= 15.0;
        trace = GameBase.gi.trace(inflictor.s.origin, Globals.vec3_origin,
                Globals.vec3_origin, dest, inflictor, Defines.MASK_SOLID);
        if (trace.fraction == 1.0)
            return true;
    
        Math3D.VectorCopy(targ.s.origin, dest);
        dest[0] -= 15.0;
        dest[1] += 15.0;
        trace = GameBase.gi.trace(inflictor.s.origin, Globals.vec3_origin,
                Globals.vec3_origin, dest, inflictor, Defines.MASK_SOLID);
        if (trace.fraction == 1.0)
            return true;
    
        Math3D.VectorCopy(targ.s.origin, dest);
        dest[0] -= 15.0;
        dest[1] -= 15.0;
        trace = GameBase.gi.trace(inflictor.s.origin, Globals.vec3_origin,
                Globals.vec3_origin, dest, inflictor, Defines.MASK_SOLID);
        if (trace.fraction == 1.0)
            return true;
    
        return false;
    }

    /**
     * Killed.
     */
    public static void Killed(edict_t targ, edict_t inflictor,
            edict_t attacker, int damage, float[] point) {
        Com.DPrintf("Killing a " + targ.classname + "\n");
        if (targ.health < -999)
            targ.health = -999;
    
        targ.enemy = attacker;
    
        if ((targ.svflags & Defines.SVF_MONSTER) != 0
                && (targ.deadflag != Defines.DEAD_DEAD)) {
            //			targ.svflags |= SVF_DEADMONSTER; // now treat as a different
            // content type
            if (0 == (targ.monsterinfo.aiflags & Defines.AI_GOOD_GUY)) {
                GameBase.level.killed_monsters++;
                if (GameBase.coop.value != 0 && attacker.client != null)
                    attacker.client.resp.score++;
                // medics won't heal monsters that they kill themselves
                if (attacker.classname.equals("monster_medic"))
                    targ.owner = attacker;
            }
        }
    
        if (targ.movetype == Defines.MOVETYPE_PUSH
                || targ.movetype == Defines.MOVETYPE_STOP
                || targ.movetype == Defines.MOVETYPE_NONE) { // doors, triggers,
                                                             // etc
            targ.die.die(targ, inflictor, attacker, damage, point);
            return;
        }
    
        if ((targ.svflags & Defines.SVF_MONSTER) != 0
                && (targ.deadflag != Defines.DEAD_DEAD)) {
            targ.touch = null;
            Monster.monster_death_use(targ);
        }
    
        targ.die.die(targ, inflictor, attacker, damage, point);
    }

    /**
     * SpawnDamage.
     */
    static void SpawnDamage(int type, float[] origin, float[] normal, int damage) {
        if (damage > 255)
            damage = 255;
        GameBase.gi.WriteByte(Defines.svc_temp_entity);
        GameBase.gi.WriteByte(type);
        //		gi.WriteByte (damage);
        GameBase.gi.WritePosition(origin);
        GameBase.gi.WriteDir(normal);
        GameBase.gi.multicast(origin, Defines.MULTICAST_PVS);
    }

    static int CheckPowerArmor(edict_t ent, float[] point, float[] normal,
            int damage, int dflags) {
        gclient_t client;
        int save;
        int power_armor_type;
        int index = 0;
        int damagePerCell;
        int pa_te_type;
        int power = 0;
        int power_used;
    
        if (damage == 0)
            return 0;
    
        client = ent.client;
    
        if ((dflags & Defines.DAMAGE_NO_ARMOR) != 0)
            return 0;
    
        if (client != null) {
            power_armor_type = GameItems.PowerArmorType(ent);
            if (power_armor_type != Defines.POWER_ARMOR_NONE) {
                index = GameItems.ITEM_INDEX(GameItems.FindItem("Cells"));
                power = client.pers.inventory[index];
            }
        } else if ((ent.svflags & Defines.SVF_MONSTER) != 0) {
            power_armor_type = ent.monsterinfo.power_armor_type;
            power = ent.monsterinfo.power_armor_power;
        } else
            return 0;
    
        if (power_armor_type == Defines.POWER_ARMOR_NONE)
            return 0;
        if (power == 0)
            return 0;
    
        if (power_armor_type == Defines.POWER_ARMOR_SCREEN) {
            float[] vec = { 0, 0, 0 };
            float dot;
            float[] forward = { 0, 0, 0 };
    
            // only works if damage point is in front
            Math3D.AngleVectors(ent.s.angles, forward, null, null);
            Math3D.VectorSubtract(point, ent.s.origin, vec);
            Math3D.VectorNormalize(vec);
            dot = Math3D.DotProduct(vec, forward);
            if (dot <= 0.3)
                return 0;
    
            damagePerCell = 1;
            pa_te_type = Defines.TE_SCREEN_SPARKS;
            damage = damage / 3;
        } else {
            damagePerCell = 2;
            pa_te_type = Defines.TE_SHIELD_SPARKS;
            damage = (2 * damage) / 3;
        }
    
        save = power * damagePerCell;
    
        if (save == 0)
            return 0;
        if (save > damage)
            save = damage;
    
        SpawnDamage(pa_te_type, point, normal, save);
        ent.powerarmor_time = GameBase.level.time + 0.2f;
    
        power_used = save / damagePerCell;
    
        if (client != null)
            client.pers.inventory[index] -= power_used;
        else
            ent.monsterinfo.power_armor_power -= power_used;
        return save;
    }

    static int CheckArmor(edict_t ent, float[] point, float[] normal,
            int damage, int te_sparks, int dflags) {
        gclient_t client;
        int save;
        int index;
        gitem_t armor;
    
        if (damage == 0)
            return 0;
    
        client = ent.client;
    
        if (client == null)
            return 0;
    
        if ((dflags & Defines.DAMAGE_NO_ARMOR) != 0)
            return 0;
    
        index = GameItems.ArmorIndex(ent);
    
        if (index == 0)
            return 0;
    
        armor = GameItems.GetItemByIndex(index);
        gitem_armor_t garmor = (gitem_armor_t) armor.info;
    
        if (0 != (dflags & Defines.DAMAGE_ENERGY))
            save = (int) Math.ceil(garmor.energy_protection * damage);
        else
            save = (int) Math.ceil(garmor.normal_protection * damage);
    
        if (save >= client.pers.inventory[index])
            save = client.pers.inventory[index];
    
        if (save == 0)
            return 0;
    
        client.pers.inventory[index] -= save;
        SpawnDamage(te_sparks, point, normal, save);
    
        return save;
    }

    public static void M_ReactToDamage(edict_t targ, edict_t attacker) {
        if ((null != attacker.client)
                && 0 != (attacker.svflags & Defines.SVF_MONSTER))
            return;