game/sdlpp/sdlpp_rectcolider.cpp

#include "sdlpp_rectcolider.hpp"

namespace SDLPP {

double RectColider::width() const {
    return _size.getX();
}

double RectColider::height() const {
    return _size.getY();
}

int RectColider::pixel_width() const {
    return _size_pixel.getX();
}

int RectColider::pixel_height() const {
    return _size_pixel.getY();
}

RectColider::RectColider( double x, double y, double w, double h )
        : RectColider( { x, y }, { w, h } ) {}

RectColider::RectColider( const Vec2D< double > &top_left,
                          const Vec2D< double > &size )
        : CollisionPolygon( top_left ), _size( size ) {}

RectColider::RectColider( double x, double y, double w, double h, uint64_t id )
        : RectColider( { x, y }, { w, h }, id ) {}

RectColider::RectColider( const Vec2D< double > &top_left,
                          const Vec2D< double > &size, uint64_t id )
        : RectColider( top_left, size ) {
    _id = id;
}

bool RectColider::colidesWith( const SDLPP::CollisionPolygon &other ) const {
    if ( other.isCircle() ) {
        return other.colidesWith( *this );
    }
    if ( other.isInfinite() ) {
        return infinityIntersection( other, *this );
    }
    if ( isInfinite() )
        return infinityIntersection( *this, other );
    return intersects( *this, other );
}

bool RectColider::isCircle() const {
    return false;
}
int RectColider::topmost() const {
    return ( !isInfinite() || original.getY() != -1 ) * getY() +
           isInfinite() * -1;
}
int RectColider::bottommost() const {
    return ( !isInfinite() || height() != -1 ) * ( getY() + pixel_height() ) +
           isInfinite() * -1;
}
int RectColider::leftmost() const {
    return ( !isInfinite() || original.getX() != -1 ) * getX() +
           isInfinite() * -1;
}
int RectColider::rightmost() const {
    return ( !isInfinite() || width() != -1 ) * ( getX() + pixel_width() ) +
           isInfinite() * -1;
}

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

void RectColider::render( Renderer &renderer, const SDL_Color &color,
                          const SDL_Color &outline_color ) {
    auto rect = getRect();
    SDL_SetRenderDrawColor( renderer.getRendererPtr(), color.r, color.g,
                            color.b, color.a );
    SDL_RenderFillRect( renderer.getRendererPtr(), &rect );
    SDL_SetRenderDrawColor( renderer.getRendererPtr(), outline_color.r,
                            outline_color.g, outline_color.b, outline_color.a );
    SDL_RenderDrawRect( renderer.getRendererPtr(), &rect );
}

void RectColider::render( Renderer &renderer, const SDL_Color &color ) {
    auto input_color = color;
    auto outline_color = color;
    input_color.a = 0x40;
    outline_color.a = 0x80;
    render( renderer, input_color, outline_color );
}

void RectColider::render( Renderer &renderer ) {
    render( renderer, sdl_color, sdl_outline );
}

SDL_Rect RectColider::getRect() {
    if ( !isInfinite() )
        return { leftmost(), topmost(), pixel_width(), pixel_height() };

    SDL_Rect r = { 0, 0, 0, 0 };
    if ( ( r.x = leftmost() ) == -1 )
        r.x = 0;
    if ( ( r.y = topmost() ) == -1 )
        r.y = 0;
    if ( rightmost() == -1 )
        r.w = std::numeric_limits< int >::max();
    else
        r.w = pixel_width();
    if ( bottommost() == -1 )
        r.h = std::numeric_limits< int >::max();
    else
        r.h = pixel_height();
    return r;
}

std::shared_ptr< CollisionPolygon > RectColider::copySelf() {
    return std::make_shared< RectColider >( *this );
}

std::vector< Line< int > > RectColider::getLines() const {
    std::vector< Line< int > > ret{};
    ret.emplace_back( position, position + Vec2D< int >( pixel_width(), 0 ) );
    ret.emplace_back( position + Vec2D< int >( pixel_width(), 0 ),
                      position + _size_pixel );
    ret.emplace_back( position, position + Vec2D< int >( 0, pixel_height() ) );
    ret.emplace_back( position + Vec2D< int >( 0, pixel_height() ),
                      position + _size_pixel );
    return ret;
}

} // namespace SDLPP