OpenSteer::AbstractVehicle*
OpenSteer::OpenSteerDemo::findVehicleNearestScreenPosition (int x, int y)
{
// find the direction from the camera position to the given pixel
const Vec3 direction = directionFromCameraToScreenPosition (x, y, glutGet (GLUT_WINDOW_HEIGHT));
// iterate over all vehicles to find the one whose center is nearest the
// "eye-mouse" selection line
float minDistance = FLT_MAX; // smallest distance found so far
AbstractVehicle* nearest = NULL; // vehicle whose distance is smallest
const AVGroup& vehicles = allVehiclesOfSelectedPlugIn();
for (AVIterator i = vehicles.begin(); i != vehicles.end(); i++)
{
// distance from this vehicle's center to the selection line:
const float d = distanceFromLine ((**i).position(),
camera.position(),
direction);
// if this vehicle-to-line distance is the smallest so far,
// store it and this vehicle in the selection registers.
if (d < minDistance)
{
minDistance = d;
nearest = *i;
}
}
return nearest;
}
void
OpenSteer::OpenSteerDemo::updateSelectedPlugIn (const float currentTime,
const float elapsedTime)
{
// switch to Update phase
pushPhase (updatePhase);
// service queued reset request, if any
doDelayedResetPlugInXXX ();
// if no vehicle is selected, and some exist, select the first one
if (SteeringVehicle::getSelectedVehicle() == nullptr)
{
const AVGroup& vehicles = allVehiclesOfSelectedPlugIn();
if (vehicles.size() > 0)
SteeringVehicle::setSelectedVehicle( vehicles.front() );
}
// invoke selected Plugin's Update method
AbstractUpdated* updatedPlugin = dynamic_cast<AbstractUpdated*>(OpenSteer::Plugin::getSelectedPlugin());
assert( updatedPlugin != nullptr );
updatedPlugin->update (currentTime, elapsedTime);
// return to previous phase
popPhase ();
}
void
OpenSteer::OpenSteerDemo::selectNextVehicle (void)
{
if (selectedVehicle != NULL)
{
// get a container of all vehicles
const AVGroup& all = allVehiclesOfSelectedPlugIn ();
const AVIterator first = all.begin();
const AVIterator last = all.end();
// find selected vehicle in container
const AVIterator s = std::find (first, last, selectedVehicle);
// normally select the next vehicle in container
selectedVehicle = *(s+1);
// if we are at the end of the container, select the first vehicle
if (s == last-1) selectedVehicle = *first;
// if the search failed, use NULL
if (s == last) selectedVehicle = NULL;
}
}
void
OpenSteer::OpenSteerDemo::updateSelectedPlugIn (const float currentTime,
const float elapsedTime)
{
// switch to Update phase
pushPhase (updatePhase);
// service queued reset request, if any
doDelayedResetPlugInXXX ();
// if no vehicle is selected, and some exist, select the first one
if (selectedVehicle == NULL)
{
const AVGroup& vehicles = allVehiclesOfSelectedPlugIn();
if (vehicles.size() > 0) selectedVehicle = vehicles.front();
}
// invoke selected PlugIn's Update method
selectedPlugIn->update (currentTime, elapsedTime);
// return to previous phase
popPhase ();
}
void
OpenSteer::OpenSteerDemo::selectNextVehicle (void)
{
if (SteeringVehicle::getSelectedVehicle() != nullptr)
{
// get a container of all vehicles
const AVGroup& all = allVehiclesOfSelectedPlugIn ();
const AVIterator first = all.begin();
const AVIterator last = all.end();
// find selected vehicle in container
const AVIterator s = std::find (first, last, SteeringVehicle::getSelectedVehicle());
// normally select the next vehicle in container
SteeringVehicle::setSelectedVehicle( *(s+1) );
// if we are at the end of the container, select the first vehicle
if (s == last-1) SteeringVehicle::setSelectedVehicle( *first );
// if the search failed, use nullptr
if (s == last) SteeringVehicle::setSelectedVehicle( nullptr );
}
}
