game/sdlpp/sdlpp_collision.cpp

#include "sdlpp_collision.hpp"
#include "sdlpp_geometry.hpp"

namespace SDLPP {
CollisionPolygon::CollisionPolygon( double x, double y )
        : CollisionPolygon( Vec2D< double >( x, y ) ) {}

CollisionPolygon::CollisionPolygon( const Vec2D< double > &input ) {
    original = input;
    position = { 0, 0 };
}
CollisionPolygon::CollisionPolygon( double x, double y, uint64_t id )
        : CollisionPolygon( Vec2D< double >( x, y ), id ) {}
CollisionPolygon::CollisionPolygon( const Vec2D< double > &input, uint64_t id )
        : CollisionPolygon( input ) {
    _id = id;
}

bool CollisionPolygon::isInfinite() const {
    return infinite;
}
void CollisionPolygon::setInfinite() {
    infinite = true;
}

void CollisionPolygon::updateCollision( int x, int y, int w, int h,
                                        uint64_t id ) {
    if ( _id == static_cast< uint64_t >( -1 ) )
        _id = id;
    position = Vec2D< int >( original.getX() * w + x, original.getY() * h + y );
}

int CollisionPolygon::getX() const {
    return position.getX();
}
int CollisionPolygon::getY() const {
    return position.getY();
}

void CollisionPolygon::setColor( const std::string &color ) {
    sdl_color = getSDLColorHEX( color );
}
void CollisionPolygon::setOutlineColor( const std::string &color ) {
    sdl_outline = getSDLColorHEX( color );
}
void CollisionPolygon::setId( uint64_t id ) {
    _id = id;
}
uint64_t CollisionPolygon::getId() {
    return _id;
}

bool infinityIntersection( const SDLPP::CollisionPolygon &infinite,
                           const SDLPP::CollisionPolygon &other ) {
    int ileft = infinite.leftmost();
    int iright = infinite.rightmost();
    int itop = infinite.topmost();
    int ibottom = infinite.bottommost();
    bool ret =
        ileft != -1 && ileft <= other.rightmost() && ileft >= other.leftmost();
    ret |= iright != -1 && iright >= other.leftmost() &&
           iright <= other.rightmost();
    ret |= itop != -1 && itop <= other.bottommost() && itop >= other.topmost();
    ret |= ibottom != -1 && ibottom >= other.topmost() &&
           ibottom <= other.bottommost();
    ret |= ileft == -1 && iright == -1 && itop == -1 && ibottom == -1;
    return ret;
}

bool intersects( const SDLPP::CollisionPolygon &p1,
                 const SDLPP::CollisionPolygon &p2 ) {
    if ( p1.rightmost() < p2.leftmost() || p2.rightmost() < p1.leftmost() ||
         p1.bottommost() < p2.topmost() || p2.bottommost() < p1.topmost() )
        return false;
    for ( auto &line : p1.getLines() ) {
        for ( auto &line2 : p2.getLines() ) {
            if ( linesCross( line, line2 ) )
                return true;
        }
    }
    return false;
}
} // namespace SDLPP