MapCoord SnappingToolHelper::snapToObject(MapCoordF position, MapWidget* widget, SnappingToolHelperSnapInfo* info, Object* exclude_object, float snap_distance)
{
if (snap_distance < 0)
snap_distance = 0.001f * widget->getMapView()->pixelToLength(Settings::getInstance().getMapEditorSnapDistancePx());
float closest_distance_sq = snap_distance * snap_distance;
auto result_position = MapCoord { position };
SnappingToolHelperSnapInfo result_info;
result_info.type = NoSnapping;
result_info.object = NULL;
result_info.coord_index = -1;
result_info.path_coord.pos = MapCoordF(0, 0);
result_info.path_coord.index = -1;
result_info.path_coord.clen = -1;
result_info.path_coord.param = -1;
if (filter & (ObjectCorners | ObjectPaths))
{
// Find map objects at the given position
SelectionInfoVector objects;
map->findAllObjectsAt(position, snap_distance, true, false, false, true, objects);
// Find closest snap spot from map objects
for (SelectionInfoVector::const_iterator it = objects.begin(), end = objects.end(); it != end; ++it)
{
Object* object = it->second;
if (object == exclude_object)
continue;
float distance_sq;
if (object->getType() == Object::Point && filter & ObjectCorners)
{
PointObject* point = object->asPoint();
distance_sq = point->getCoordF().distanceSquaredTo(position);
if (distance_sq < closest_distance_sq)
{
closest_distance_sq = distance_sq;
result_position = point->getCoord();
result_info.type = ObjectCorners;
result_info.object = object;
result_info.coord_index = 0;
}
}
else if (object->getType() == Object::Path)
{
PathObject* path = object->asPath();
if (filter & ObjectPaths)
{
PathCoord path_coord;
path->calcClosestPointOnPath(position, distance_sq, path_coord);
if (distance_sq < closest_distance_sq)
{
closest_distance_sq = distance_sq;
result_position = MapCoord(path_coord.pos);
result_info.object = object;
if (path_coord.param == 0.0)
{
result_info.type = ObjectCorners;
result_info.coord_index = path_coord.index;
}
else
{
result_info.type = ObjectPaths;
result_info.coord_index = -1;
result_info.path_coord = path_coord;
}
}
}
else
{
MapCoordVector::size_type index;
path->calcClosestCoordinate(position, distance_sq, index);
if (distance_sq < closest_distance_sq)
{
closest_distance_sq = distance_sq;
result_position = path->getCoordinate(index);
result_info.type = ObjectCorners;
result_info.object = object;
result_info.coord_index = index;
}
}
}
else if (object->getType() == Object::Text)
{
// No snapping to texts
continue;
}
}
}
// Find closest grid snap position
if ((filter & GridCorners) && widget->getMapView()->isGridVisible() &&
map->getGrid().isSnappingEnabled() && map->getGrid().getDisplayMode() == MapGrid::AllLines)
{
MapCoordF closest_grid_point = map->getGrid().getClosestPointOnGrid(position, map);
float distance_sq = closest_grid_point.distanceSquaredTo(position);
if (distance_sq < closest_distance_sq)
{
closest_distance_sq = distance_sq;
result_position = MapCoord(closest_grid_point);
result_info.type = GridCorners;
result_info.object = NULL;
result_info.coord_index = -1;
}
}
// Return
if (snap_mark != result_position || snapped_type != result_info.type)
{
snap_mark = result_position;
snapped_type = result_info.type;
emit displayChanged();
}
if (info != NULL)
*info = result_info;
return result_position;
}
