relocate car

I need move the car in track of the segment 30 for segment 200.

car->carElt->pub.trkPos.seg=Eventos->front()->getSegmento(); // locate from
segment 200
float yy=(car->carElt->pub.trkPos.seg->vertex[0].y+
      car->carElt->pub.trkPos.seg->vertex[1].y+
      car->carElt->pub.trkPos.seg->vertex[2].y+
      car->carElt->pub.trkPos.seg->vertex[3].y)/4;
float xx=(car->carElt->pub.trkPos.seg->vertex[0].x+
      car->carElt->pub.trkPos.seg->vertex[1].x+
      car->carElt->pub.trkPos.seg->vertex[2].x+
    car->carElt->pub.trkPos.seg->vertex[3].x)/4;

car->DynGCg.pos.x=xx; //
car->DynGCg.pos.y=yy; //
car->carElt->pub.DynGCg.pos.x=xx;
car->carElt->pub.DynGCg.pos.y=yy;

If car into equals axis Y, ok
But, into another axis Y, not rendering image.

[]' Tales

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