bool LocalMapLayer::isValidPerspective(const GeoDataLatLonBox &candidate) const
{
if (!mVisible || !mHasContent)
{ //any perspective is valid if no content is showing
return true;
}
GeoDataLatLonBox box = mLocalMapLogic->currentBox();
if (!candidate.contains(box) && !candidate.intersects(box))
{ //No relation - invalid perspective
return false;
}
//Acceptable scales
qreal d = diameter(box);
qreal zoomOutLimit = d * 4;
qreal zoomInLimit = d * 0.25;
qreal dCandidate = diameter(candidate);
if (dCandidate > zoomOutLimit || dCandidate < zoomInLimit)
{ //Box is too big or too small
return false;
}
return true;
}
