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void gear::tailGear(int from,int to){
        QGraphicsLineItem* line;
        // (ÒÇæíÉ ãíá ÇáãÓÊÞíã ÇáãÇÑ ÈãÑßÒí ÇáÊÑÓ ( ãäÕÝ ÇáãËáË
        double t=atan((centers[to].y()-centers[from].y())/(centers[to].x()-centers[from].x()));
        //  ÇáÒÇæíÉ Èíä ÇáãäÕÝ æããÇÓí ÇáÊÑæÓ
        double c=asin((radials[to]-radials[from])/
        (pow(pow(centers[to].x()-centers[from].x(),2)+pow(centers[to].y()-centers[from].y(),2),.5)));
        //ÎØ ÇáÊãÇÓ ÇáÚáæí
        double m=t+c;
        double y1=sin(m-pi/2)*radials[from]+centers[from].y();
        double x1=cos(m-pi/2)*radials[from]+centers[from].x();
        double y2=sin(m-pi/2)*radials[to]+centers[to].y();
        double x2=cos(m-pi/2)*radials[to]+centers[to].x();
        scene->addItem(line=new QGraphicsLineItem(QLineF(x2,y2,x1,y1)));
        line->setPen(QPen(QBrush(Qt::green),3,Qt::DashDotDotLine));
        //ÎØ ÇáÊãÇÓ ÇáÓÝáí
        m=t-c;
        y1=sin(m+pi/2)*radials[from]+centers[from].y();
        x1=cos(m+pi/2)*radials[from]+centers[from].x();
        y2=sin(m+pi/2)*radials[to]+centers[to].y();
        x2=cos(m+pi/2)*radials[to]+centers[to].x();
        scene->addItem(line=new QGraphicsLineItem(QLineF(x2,y2,x1,y1)));
        line->setPen(QPen(QBrush(Qt::green),3,Qt::DashDotDotLine));
}