azerothcore-wotlk/src/server/game/Maps/AreaBoundary.cpp

/*
 * This file is part of the AzerothCore Project. See AUTHORS file for Copyright information
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Affero General Public License as published by the
 * Free Software Foundation; either version 3 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 Affero General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include "AreaBoundary.h"
#include "Unit.h"

// ---== RECTANGLE ==---
RectangleBoundary::RectangleBoundary(float southX, float northX, float eastY, float westY, bool isInverted) :
    AreaBoundary(isInverted), _minX(southX), _maxX(northX), _minY(eastY), _maxY(westY) { }
bool RectangleBoundary::IsWithinBoundaryArea(Position const* pos) const
{
    return !(
        pos->GetPositionX() < _minX ||
        pos->GetPositionX() > _maxX ||
        pos->GetPositionY() < _minY ||
        pos->GetPositionY() > _maxY
        );
}

// ---== CIRCLE ==---
CircleBoundary::CircleBoundary(Position const& center, double radius, bool isInverted) :
    AreaBoundary(isInverted), _center(center), _radiusSq(radius*radius) { }

CircleBoundary::CircleBoundary(Position const& center, Position const& pointOnCircle, bool isInverted) :
    AreaBoundary(isInverted), _center(center), _radiusSq(_center.GetDoubleExactDist2dSq(pointOnCircle)) { }

bool CircleBoundary::IsWithinBoundaryArea(Position const* pos) const
{
    double offX = _center.GetDoublePositionX() - pos->GetPositionX();
    double offY = _center.GetDoublePositionY() - pos->GetPositionY();
    return offX * offX + offY * offY <= _radiusSq;
}

// ---== ELLIPSE ==---
EllipseBoundary::EllipseBoundary(Position const& center, double radiusX, double radiusY, bool isInverted) :
    AreaBoundary(isInverted), _center(center), _radiusYSq(radiusY*radiusY), _scaleXSq(_radiusYSq / (radiusX*radiusX)) { }

bool EllipseBoundary::IsWithinBoundaryArea(Position const* pos) const
{
    double offX = _center.GetDoublePositionX() - pos->GetPositionX();
    double offY = _center.GetDoublePositionY() - pos->GetPositionY();
    return (offX*offX)*_scaleXSq + (offY*offY)  <=  _radiusYSq;
}

// ---== TRIANGLE ==---
TriangleBoundary::TriangleBoundary(Position const& pointA, Position const& pointB, Position const& pointC, bool isInverted) :
    AreaBoundary(isInverted), _a(pointA), _b(pointB), _c(pointC), _abx(_b.GetDoublePositionX()-_a.GetDoublePositionX()), _bcx(_c.GetDoublePositionX()-_b.GetDoublePositionX()), _cax(_a.GetDoublePositionX() - _c.GetDoublePositionX()), _aby(_b.GetDoublePositionY()-_a.GetDoublePositionY()), _bcy(_c.GetDoublePositionY()-_b.GetDoublePositionY()), _cay(_a.GetDoublePositionY() - _c.GetDoublePositionY()) { }
bool TriangleBoundary::IsWithinBoundaryArea(Position const* pos) const
{
    // half-plane signs
    bool sign1 = ((-_b.GetDoublePositionX() + pos->GetPositionX()) * _aby - (-_b.GetDoublePositionY() + pos->GetPositionY()) * _abx) < 0;
    bool sign2 = ((-_c.GetDoublePositionX() + pos->GetPositionX()) * _bcy - (-_c.GetDoublePositionY() + pos->GetPositionY()) * _bcx) < 0;
    bool sign3 = ((-_a.GetDoublePositionX() + pos->GetPositionX()) * _cay - (-_a.GetDoublePositionY() + pos->GetPositionY()) * _cax) < 0;

    // if all signs are the same, the point is inside the triangle
    return ((sign1 == sign2) && (sign2 == sign3));
}

// ---== PARALLELOGRAM ==---
ParallelogramBoundary::ParallelogramBoundary(Position const& cornerA, Position const& cornerB, Position const& cornerD, bool isInverted) :
    AreaBoundary(isInverted), _a(cornerA), _b(cornerB), _d(cornerD), _c(DoublePosition(_d.GetDoublePositionX() + (_b.GetDoublePositionX() - _a.GetDoublePositionX()), _d.GetDoublePositionY() + (_b.GetDoublePositionY() - _a.GetDoublePositionY()))), _abx(_b.GetDoublePositionX() - _a.GetDoublePositionX()), _dax(_a.GetDoublePositionX() - _d.GetDoublePositionX()), _aby(_b.GetDoublePositionY() - _a.GetDoublePositionY()), _day(_a.GetDoublePositionY() - _d.GetDoublePositionY()) { }
bool ParallelogramBoundary::IsWithinBoundaryArea(Position const* pos) const
{
    // half-plane signs
    bool sign1 = ((-_b.GetDoublePositionX() + pos->GetPositionX()) * _aby - (-_b.GetDoublePositionY() + pos->GetPositionY()) * _abx) < 0;
    bool sign2 = ((-_a.GetDoublePositionX() + pos->GetPositionX()) * _day - (-_a.GetDoublePositionY() + pos->GetPositionY()) * _dax) < 0;
    bool sign3 = ((-_d.GetDoublePositionY() + pos->GetPositionY()) * _abx - (-_d.GetDoublePositionX() + pos->GetPositionX()) * _aby) < 0; // AB = -CD
    bool sign4 = ((-_c.GetDoublePositionY() + pos->GetPositionY()) * _dax - (-_c.GetDoublePositionX() + pos->GetPositionX()) * _day) < 0; // DA = -BC

    // if all signs are equal, the point is inside
    return ((sign1 == sign2) && (sign2 == sign3) && (sign3 == sign4));
}

// ---== Z RANGE ==---
ZRangeBoundary::ZRangeBoundary(float minZ, float maxZ, bool isInverted) :
    AreaBoundary(isInverted), _minZ(minZ), _maxZ(maxZ) { }
bool ZRangeBoundary::IsWithinBoundaryArea(Position const* pos) const
{
    return (_minZ <= pos->GetPositionZ() && pos->GetPositionZ() <= _maxZ);
}

// ---== UNION OF 2 BOUNDARIES ==---
BoundaryUnionBoundary::BoundaryUnionBoundary(AreaBoundary const* b1, AreaBoundary const* b2, bool isInverted) :
    AreaBoundary(isInverted), _b1(b1), _b2(b2)
{
    ASSERT(b1 && b2);
}

BoundaryUnionBoundary::~BoundaryUnionBoundary()
{
    delete _b1;
    delete _b2;
}

bool BoundaryUnionBoundary::IsWithinBoundaryArea(Position const* pos) const
{
    return (_b1->IsWithinBoundary(pos) || _b2->IsWithinBoundary(pos));
}