#ifndef CIRCLE1_H
 #define CIRCLE1_H
 #include <QObject>
 #include <QPainter>
 #include <QtQuick>
  
class circle1 : public QObject
{
     Q_OBJECT
     Q_PROPERTY(int radius READ radius WRITE setRadius NOTIFY RadiusChanged)
     Q_PROPERTY(int wavelength READ wavelength WRITE setWavelength NOTIFY WavelengthChanged)
     Q_PROPERTY(int distance_to_the_screen READ distance_to_the_screen WRITE setDistance_to_the_screen NOTIFY Distance_to_the_screenChanged)
     Q_PROPERTY(int distance_to_the_screen2 READ distance_to_the_screen2 WRITE setDistance_to_the_screen2 NOTIFY Distance_to_the_screen2Changed)
private:
     int _wavelength;
     int _radius;
     int _distance_to_the_screen;
     int _distance_to_the_screen2;
public:
     explicit circle1(QObject *parent = 0);
//    //Запуск класса
//    void start(int &a,int &b,int &c,int &d);
     //Вывод изображения
     Q_INVOKABLE void draw(QPainter *painter);
     //Get-функции
     int radius();
     int wavelength();
     int distance_to_the_screen();
     int distance_to_the_screen2();
     //Set-функции
     void setWavelength(int &a);
     void setRadius(int &a);
     void setDistance_to_the_screen(int &a);
     void setDistance_to_the_screen2(int &a);
 signals:
     //Сигналы для Set-функций
     void RadiusChanged();
     void WavelengthChanged();
     void Distance_to_the_screenChanged();
     void Distance_to_the_screen2Changed();
     void PaintChanged();
public slots:
};
 #endif // CIRCLE1_H

void circle1::draw(QPainter *painter)
{
     painter->save();
  
     double m;
     QPen pen = QPen(Qt::NoPen);
     QBrush black_brush = QBrush(Qt::black);
     QBrush red_brush = QBrush(Qt::red);
     painter->setPen(pen);
     m=100000*(_radius*_radius)/_wavelength;
     m=m*(1/_distance_to_the_screen+1/(_distance_to_the_screen2-_distance_to_the_screen));
     int k=int(m);
     if(k!=0)
     {
         m=120/k;
         for(int i=1;i<=k;i++)
         {
             if(i%2==1)
             {
                 painter->setBrush(red_brush);
                 painter->drawEllipse(2+m*(i-1),2+m*(i-1),210-m*(i-1)*2,210-m*(i-1)*2);
             }
             else
             {
                 painter->setBrush(black_brush);
                 painter->drawEllipse(2+m*(i-1),2+m*(i-1),210-m*(i-1)*2,210-m*(i-1)*2);
             }
         }
     }
     else
     {
         int i;
         painter->setBrush(red_brush);
         painter->drawEllipse(2+m*(i-1),2+m*(i-1),210-m*(i-1)*2,210-m*(i-1)*2);
     }
     painter->restore();
     emit PaintChanged();
}

...
         Rectangle{
             id: for_start;
             x: 600
             anchors.top: rectangle1.bottom
             anchors.topMargin: 11
             anchors.right: parent.right
             anchors.rightMargin: 424
             Button{
                 id:start
                 text:"Start"
                 onClicked: {
                     Circle1.radius = slider2.value
                     Circle1.wavelength = slider1.value
                     Circle1.distance_to_the_screen = slider3.value
                     Circle1.distance_to_the_screen2 = slider4.value
                     Circle1.draw(rectangle2)
                 }
             }
         }
 ...