std::pair<bool, Ogre::Vector3> CombatCamera::IntersectMouseWithEcliptic(const GG::Pt& pt) const
{
std::pair<bool, Ogre::Vector3> retval(false, Ogre::Vector3());
double ray_origin[3];
double ray_direction[3];
ViewportRay(Value(pt.x * 1.0 / GG::GUI::GetGUI()->AppWidth()),
Value(pt.y * 1.0 / GG::GUI::GetGUI()->AppHeight()),
ray_origin, ray_direction);
double unit_z[3] = { 0, 0, 1.0 };
double origin[3] = { 0, 0, 0 };
std::pair<bool, double> intersection = Intersects(ray_origin, ray_direction, unit_z, origin);
if (intersection.first) {
double point[3] = {
ray_origin[0] + ray_direction[0] * intersection.second,
ray_origin[1] + ray_direction[1] * intersection.second,
ray_origin[2] + ray_direction[2] * intersection.second
};
const double MAX_DISTANCE_SQ = SystemRadius() * SystemRadius();
if ((point[0] * point[0] + point[1] * point[1] + point[2] * point[2]) < MAX_DISTANCE_SQ) {
retval.first = true;
retval.second.x = point[0];
retval.second.y = point[1];
retval.second.z = point[2];
}
}
return retval;
}
void CombatCamera::MouseWheel(const GG::Pt& pt, int move, GG::Flags<GG::ModKey> mod_keys)
{
Ogre::Real total_move = TotalMove(move, mod_keys, DistanceToLookAtPoint());
if (0 < move)
{
const unsigned int TICKS = GG::GUI::GetGUI()->Ticks();
const unsigned int ZOOM_IN_TIMEOUT = 750u;
if (m_initial_zoom_in_position == INVALID_MAP_LOCATION ||
ZOOM_IN_TIMEOUT < TICKS - m_previous_zoom_in_time)
{
std::pair<bool, Ogre::Vector3> intersection = IntersectMouseWithEcliptic(pt);
m_initial_zoom_in_position = intersection.first ? intersection.second : INVALID_MAP_LOCATION;
}
if (m_initial_zoom_in_position != INVALID_MAP_LOCATION) {
const double CLOSE_FACTOR = move * 0.333 * ZoomFactor(mod_keys);
Ogre::Vector3 start = Moving() ? m_look_at_point_target : LookAtPoint();
Ogre::Vector3 delta = m_initial_zoom_in_position - start;
double delta_length = delta.length();
double distance = std::min(std::max(1.0, delta_length * CLOSE_FACTOR), delta_length);
delta.normalise();
Ogre::Vector3 new_center = start + delta * distance;
if (new_center.length() < SystemRadius())
LookAtPositionAndZoom(new_center, ZoomResult(total_move));
}
m_previous_zoom_in_time = TICKS;
} else if (move < 0) {
ZoomImpl(total_move);
}
}
double StarlaneEntranceOrbitalRadius()
{ return SystemRadius() - StarlaneEntranceRadialAxis(); }
double OrbitalRadius(unsigned int orbit) {
assert(orbit < 10);
return (SystemRadius() - 50.0) / 10 * (orbit + 1) - 20.0;
}
