Масштабирование карты по размеру объекта

  int widgetHeight = ui.DMapView1->height();
  int widgetWidth = ui.DMapView1->width();

  HMAP mapHandle = ui.DMapView1->GetMapHandle();
  // objectHandle - идентификатор объекта (HOBJ)
  DFRAME objectFrame;
  mapObjectFrame(objectHandle, &objectFrame);

  DOUBLEPOINT centerPoint;
  centerPoint.x = (objectFrame.X1 + objectFrame.X2)/2;
  centerPoint.y = (objectFrame.Y1 + objectFrame.Y2)/2;

  mapPlaneToPicture(mapHandle, &objectFrame.X1, &objectFrame.Y1);
  mapPlaneToPicture(mapHandle, &objectFrame.X2, &objectFrame.Y2);

  double scaleDividerByHeight = (fabs(objectFrame.X1 - objectFrame.X2))/widgetWidth;
  double scaleDividerByWidth = (fabs(objectFrame.Y1 - objectFrame.Y2))/widgetHeight;
  double scaleDivider = min(scaleDividerByHeight, scaleDividerByWidth);

  double currentScale = mapGetRealShowScale(mapHandle);
  double newScale = currentScale * scaleDivider;
  mapSetRealShowScale(mapHandle, newScale);
  ui.DMapView1->UpdatePictureBorder();

  mapPlaneToPicture(mapHandle, &centerPoint.x, &centerPoint.y);
  ui.DMapView1->SetMapLeftTop(centerPoint.x - widgetWidth/2, centerPoint.y - widgetHeight/2);