WeaponPosition.cpp

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////////////////////////////////////////////////////////////////////////////////
//    Scorched3D (c) 2000-2009
//
//    This file is part of Scorched3D.
//
//    Scorched3D 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.
//
//    Scorched3D 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 Scorched3D; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
////////////////////////////////////////////////////////////////////////////////

#include <weapons/WeaponPosition.h>
#include <weapons/AccessoryStore.h>
#include <engine/ActionController.h>
#include <landscapemap/LandscapeMaps.h>

REGISTER_ACCESSORY_SOURCE(WeaponPosition);

WeaponPosition::WeaponPosition() :
        positionOffset_(0, 0, 0)
{

}

WeaponPosition::~WeaponPosition()
{

}

bool WeaponPosition::parseXML(AccessoryCreateContext &context, XMLNode *accessoryNode) 
{
        if (!Weapon::parseXML(context, accessoryNode)) return false;

        // Get the next weapon
        XMLNode *subNode = 0;
        if (!accessoryNode->getNamedChild("aimedweapon", subNode)) return false;

        // Check next weapon is correct type
        AccessoryPart *accessory = context.getAccessoryStore().
                createAccessoryPart(context, parent_, subNode);
        if (!accessory || accessory->getType() != AccessoryPart::AccessoryWeapon)
        {
                return subNode->returnError("Failed to find sub weapon, not a weapon");
        }
        aimedWeapon_ = (Weapon*) accessory;

        if (!accessoryNode->getNamedChild("position", position_)) return false;

        // Optional random offset
        accessoryNode->getNamedChild("positionoffset", positionOffset_, false);

        // Force it to ground level
        accessoryNode->getNamedChild("onground", onGround_, false);

        return true;
}

void WeaponPosition::fireWeapon(ScorchedContext &context,
        WeaponFireContext &weaponContext, FixedVector &position, FixedVector &velocity)
{
        // Position the fired weapon at the desired position, 
        // +/- optional random offset
        RandomGenerator &random = context.getActionController().getRandom();

        if(onGround_)
        {
                fixed minHeight = context.getLandscapeMaps().getGroundMaps().getInterpHeight(
                                position[0], position[1]);
                position_[2] = minHeight;
        }

        FixedVector newPosition;
        newPosition[0] = position_[0] - positionOffset_[0] +
                positionOffset_[0] * 2 * random.getRandFixed();
        newPosition[1] = position_[1] - positionOffset_[1] +
                positionOffset_[1] * 2 * random.getRandFixed();
        newPosition[2] = position_[2] - positionOffset_[2] +            
                positionOffset_[2] * 2 * random.getRandFixed();
        
        aimedWeapon_->fireWeapon(context, weaponContext, newPosition, velocity);

}

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