OpenCASCADE Animation function not work

Hi Everyone:

I have tried to use AIS_Animation and AIS_AnimationObject to do a basic Two-link Animation. And when I click the Winform button, then start to play animation. The animation code is written in the OCCTProxy project, which is a function. But when I clicked, things did not happen. And here is my code: It first sets the two link's start_pnt and end_pnt individually and adds to the animation object. Then play in the while loop. Does anyone have any idea?

// Animation function void MOVJAnimation( void ) {

    // add animation object
Handle( AIS_Animation ) ais_animation = new AIS_Animation( "MOVJ_project" );
gp_Trsf start_pnt_axis1, start_pnt_axis2;

// C1, C2 = 0 deg
start_pnt_axis1.SetValues( 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0 );
start_pnt_axis2.SetValues( 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0 );

// C1 = 80 deg, C2 = 50 deg

int index = 0;
for( auto iter = CADModel().begin(); iter != CADModel().end(); iter++ ) {
    if( index == 0 ) {
        gp_Trsf end_pnt_axis1 = iter->Location().Transformation();
        gp_Ax1 axe1 =
            gp_Ax1( gp_Pnt( end_pnt_axis1.Value( 1, 4 ), end_pnt_axis1.Value( 2, 4 ), end_pnt_axis1.Value( 3, 4 ) ), gp_Dir( 0, 0, 1 ) );
        end_pnt_axis1.SetRotation( axe1, 90 * M_PI / 180. );
        Handle( AIS_AnimationObject ) ais_ao =
            new AIS_AnimationObject( "MOVJ_project", myAISContext(), new AIS_Shape( *iter ), start_pnt_axis1, end_pnt_axis1 );
        ais_ao->SetOwnDuration( 5 );
        ais_ao->SetStartPts( 0 );
        ais_animation->Add( ais_ao );
    }
    else if( index == 1 ){
        gp_Trsf end_pnt_axis2 = iter->Location().Transformation();
        gp_Ax1 axe1 = gp_Ax1( gp_Pnt( 0, 0, 0 ), gp_Dir( 0, 0, 1 ) );
        gp_Ax1 axe2 = gp_Ax1( gp_Pnt( 0, 0, 0 ), gp_Dir( 0, 1, 0 ) );
        axe2.Rotate( axe1, 90 * M_PI / 180. );
        end_pnt_axis2.SetRotation( axe2, 50 * M_PI / 180. );
        Handle( AIS_AnimationObject ) ais_ao =
            new AIS_AnimationObject( "MOVJ_project", myAISContext(), new AIS_Shape( *iter ), start_pnt_axis2, end_pnt_axis2 );
        ais_ao->SetOwnDuration( 5 );
        ais_ao->SetStartPts( 0 );
        ais_animation->Add( ais_ao );
        }
    else {
    }
        index++;
}

// clear old transformation model
// myAISContext()->RemoveAll( Standard_False );
double duration = ais_animation->Duration();
ais_animation->StartTimer( 0, 1.0, Standard_True, Standard_False );
while( !ais_animation->IsStopped() ) {
    ais_animation->UpdateTimer();
    myAISContext()->UpdateCurrentViewer();
}

    return;

}