// ok, need thing to step down through bodies and find closest approach
// modify targpos directly to aim short of dangerous bodies
static bool ParentSafetyAdjust(Ship *ship, Frame *targframe, const vector3d &posoff, vector3d &targpos)
{
Body *body = 0;
Frame *frame = targframe->IsRotatingFrame() ? targframe->m_parent : targframe;
while (frame)
{
double sdist = ship->GetPositionRelTo(frame).Length(); // ship position in that frame
if (sdist < frame->GetRadius()) break;
while (frame && !(body = frame->GetBodyFor()))
frame = frame->m_parent;
if (!frame) return false;
frame = body->GetFrame()->m_parent;
if (body->HasDoubleFrame()) frame = frame->m_parent;
}
if (!body) return false;
// ok, so if body != 0, aim for zero velocity at distance to surface of that body
// still along path to target
vector3d targpos2 = targpos - ship->GetPosition();
double targdist = targpos2.Length();
double bodydist = body->GetPositionRelTo(ship).Length() - MaxEffectRad(body, ship)*1.5;
if (targdist < bodydist) return false;
targpos -= (targdist - bodydist) * targpos2 / targdist;
// printf("Adjusted targpos for safety from %s: old = %.1f, new = %.1f\n",
// body->GetLabel().c_str(), targdist, (targpos-ship->GetPosition()).Length());
return true;
}
// ok, need thing to step down through bodies and find closest approach
// modify targpos directly to aim short of dangerous bodies
static bool ParentSafetyAdjust(Ship *ship, Frame *targframe, vector3d &targpos, vector3d &targvel)
{
Body *body = 0;
Frame *frame = targframe->GetNonRotFrame();
while (frame)
{
if (ship->GetFrame()->GetNonRotFrame() == frame) break; // ship in frame, stop
if (frame->GetBody()) body = frame->GetBody(); // ignore grav points?
double sdist = ship->GetPositionRelTo(frame).Length();
if (sdist < frame->GetRadius()) break; // ship inside frame, stop
frame = frame->GetParent()->GetNonRotFrame(); // check next frame down
}
if (!body) return false;
// aim for zero velocity at surface of that body
// still along path to target
vector3d targpos2 = targpos - ship->GetPosition();
double targdist = targpos2.Length();
double bodydist = body->GetPositionRelTo(ship).Length() - MaxEffectRad(body, ship)*1.5;
if (targdist < bodydist) return false;
targpos -= (targdist - bodydist) * targpos2 / targdist;
targvel = body->GetVelocityRelTo(ship->GetFrame());
return true;
}
/*
* Function: SpawnShipNear
*
* Create a ship and place it in space near the given <Body>.
*
* > ship = Space.SpawnShip(type, body, min, max, hyperspace)
*
* Parameters:
*
* type - the name of the ship
*
* body - the <Body> near which the ship should be spawned
*
* min - minimum distance from the body to place the ship, in Km
*
* max - maximum distance to place the ship
*
* hyperspace - optional table containing hyperspace entry information. If
* this is provided the ship will not spawn directly. Instead,
* a hyperspace cloud will be created that the ship will exit
* from. The table contains two elements, a <SystemPath> for
* the system the ship is travelling from, and the due
* date/time that the ship should emerge from the cloud.
*
* Return:
*
* ship - a <Ship> object for the new ship
*
* Example:
*
* > -- spawn a ship 10km from the player
* > local ship = Ship.SpawnNear("viper_police_craft", Game.player, 10, 10)
*
* Availability:
*
* alpha 10
*
* Status:
*
* experimental
*/
static int l_space_spawn_ship_near(lua_State *l)
{
if (!Pi::game)
luaL_error(l, "Game is not started");
LUA_DEBUG_START(l);
const char *type = luaL_checkstring(l, 1);
if (! ShipType::Get(type))
luaL_error(l, "Unknown ship type '%s'", type);
Body *nearbody = LuaObject<Body>::CheckFromLua(2);
float min_dist = luaL_checknumber(l, 3);
float max_dist = luaL_checknumber(l, 4);
SystemPath *path = 0;
double due = -1;
_unpack_hyperspace_args(l, 5, path, due);
Ship *ship = new Ship(type);
assert(ship);
Body *thing = _maybe_wrap_ship_with_cloud(ship, path, due);
// XXX protect against spawning inside the body
Frame * newframe = nearbody->GetFrame();
const vector3d newPosition = (MathUtil::RandomPointOnSphere(min_dist, max_dist)* 1000.0) + nearbody->GetPosition();
// If the frame is rotating and the chosen position is too far, use non-rotating parent.
// Otherwise the ship will be given a massive initial velocity when it's bumped out of the
// rotating frame in the next update
if (newframe->IsRotFrame() && newframe->GetRadius() < newPosition.Length()) {
assert(newframe->GetParent());
newframe = newframe->GetParent();
}
thing->SetFrame(newframe);;
thing->SetPosition(newPosition);
thing->SetVelocity(vector3d(0,0,0));
Pi::game->GetSpace()->AddBody(thing);
LuaObject<Ship>::PushToLua(ship);
LUA_DEBUG_END(l, 1);
return 1;
}
