bool checkNearness(Disc d1,Disc d2)
{
double vrel_radial,arel_radial;
double vector_par[2],x,y,l;
double xgap = abs(d1.getX() - d2.getX());
double ygap = abs(d1.getY() - d2.getY());
y=(d1.getY()-d2.getY());
x=(d1.getX()-d2.getX());
l=sqrt(y*y+x*x);
vector_par[0]=x/l;
vector_par[1]=y/l;
vrel_radial=(d1.getVx()-d2.getVx())*vector_par[0]+(d1.getVy()-d2.getVy())*vector_par[1];
arel_radial=(d1.getAx()-d2.getAx())*vector_par[0]+(d1.getAy()-d2.getAy())*vector_par[1];
error=vrel_radial*delt+0.5*arel_radial*delt*delt;
double r = d1.getRadius() + d2.getRadius()+error;
if(xgap*xgap + ygap*ygap<=r*r )
//sleep(1);
if(xgap*xgap + ygap*ygap <= r*r && (checkNextCollision(d1,d2)))
{
cout<<"colission bw "<<d1.getDiscNo()<<" "<<d2.getDiscNo()<<endl;
//sleep(1);
error=0;
return true;
}
error=0;
return false;
}
