Russian Qt Forum

C++ (Qt)
QColor operator+( const QColor &a, const &b )
{
    return QColor( qBound( 0, a.red() + b.red(), 255 ), qBound( 0, a.green() + b.green(), 255 ), qBound( 0, a.blue() + b.blue(), 255 ) );
}
 

C++ (Qt)
QColor operator+( const QColor &a, const &b )
{
    return QColor( qBound( 0, a.red() + b.red(), 255 ), qBound( 0, a.green() + b.green(), 255 ), qBound( 0, a.blue() + b.blue(), 255 ), qBound( 0, a.alpha() + b.alpha(), 255 ) );
}
 

C++ (Qt)
static inline qreal c_to_f( int v ) { return qreal( v ) / 255.; }
 
QColor operator+( const QColor &c1, const QColor &c2 )
{
    if( !c1.alpha() && !c2.alpha() )
      return QColor( 0, 0, 0, 0 );
 
    qreal a1 = c_to_f( c1.alpha() );
    qreal a2 = c_to_f( c2.alpha() );
    qreal a = qBound( 0., a1 + a2, 1. );
 
    qreal r = qBound( 0., ( ( c_to_f( c1.red() ) * a1 + c_to_f( c2.red() ) * a2 ) / a, 1. );
    qreal g = qBound( 0., ( ( c_to_f( c1.green() ) * a1 + c_to_f( c2.green() ) * a2 ) / a, 1. );
    qreal b = qBound( 0., ( ( c_to_f( c1.blue() ) * a1 + c_to_f( c2.blue() ) * a2 ) / a, 1. );;
 
    return QColor::fromRgbF( r, g, b, a );
}
 

C++ (Qt)
QColor operator+( const QColor &c1, const QColor &c2 )
{
    if( !c1.alpha() && !c2.alpha() )
      return QColor( 0, 0, 0, 0 );
 
    qreal a1 = c1.alphaF();
    qreal a2 = c2.alphaF();
    qreal a = qBound( 0., a1 + a2, 1. );
 
    qreal r = qBound( 0., ( c1.redF() * a1 + c2.redF() * a2 ) / a, 1. );
    qreal g = qBound( 0., ( c1.greenF() * a1 + c2.greenF() * a2 ) / a, 1. );
    qreal b = qBound( 0., ( c1.blueF() * a1 + c2.blueF() * a2 ) / a, 1. );
 
    return QColor::fromRgbF( r, g, b, a );
}
 

C++ (Qt)
const QColor operator+(const QColor &c1, const QColor &c2) {
 
    qreal x = 0.5 * (1.0 - c1.alphaF() + c2.alphaF());
 
    qreal alpha  = 0.5 * (c1.alphaF() + c2.alphaF());
    qreal red     = c1.redF() * (1.0 - x) + x * c2.redF();
    greal green  = c1.greenF() * (1.0 - x) + x * c2.greenF();
    qreal blue    = c1.blueF() * (1.0 - x) + x * c2.blueF();
 
    return QColor(red, green, blue, alpha);
}
 

C++ (Qt)
qreal QColor::red( void ) const;
 

C++ (Qt)
template <class T>
struct ARGB {
 T a, rgb[3];
};

C++ (Qt)
QColor average = (c1 + c2) / 2;
 

C++ (Qt)
QPoint middle = (pt1 + pt2) / 2;
 

C++ (Qt)
QPoint middle = (pt1 + pt2) / 2;
 

C++ (Qt)
QPoint middle = (pt1 + pt2) ^ 2;