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/* Starshatter: The Open Source Project
Copyright (c) 2021-2024, Starshatter: The Open Source Project Contributors
Copyright (c) 2011-2012, Starshatter OpenSource Distribution Contributors
Copyright (c) 1997-2006, Destroyer Studios LLC.
AUTHOR: John DiCamillo
OVERVIEW
========
Debris Sprite animation class
*/
#include "Debris.h"
#include "Shot.h"
#include "Explosion.h"
#include "Sim.h"
#include "StarSystem.h"
#include "Terrain.h"
#include "Solid.h"
#include "Bitmap.h"
#include "Clock.h"
#include "Random.h"
// +--------------------------------------------------------------------+
Debris::Debris(Model* model, const Vec3& pos, const Vec3& vel, double m)
: SimObject("Debris", SimObject::SIM_DEBRIS)
{
MoveTo(pos);
velocity = vel;
mass = (float) m;
integrity = mass * 10.0f;
life = 300;
Solid* solid = new Solid;
if (solid) {
solid->UseModel(model);
solid->MoveTo(pos);
rep = solid;
radius = solid->Radius();
}
Point torque = RandomVector(Mass()/2);
if (Mass() < 10)
torque *= (rand() / 3200);
else if (Mass() > 10e3)
torque *= 0.25;
else if (Mass() > 10e6)
torque *= 0.005;
ApplyTorque(torque);
}
// +--------------------------------------------------------------------+
int
Debris::HitBy(Shot* shot, Point& impact)
{
if (!shot->IsArmed()) return 0;
const int HIT_NOTHING = 0;
const int HIT_HULL = 1;
Point hull_impact;
int hit_type = HIT_NOTHING;
bool hit_hull = true;
Point shot_loc = shot->Location();
Point delta = shot_loc - Location();
double dlen = delta.length();
double dscale = 1;
float scale = 1.0f;
Sim* sim = Sim::GetSim();
// MISSILE PROCESSING ------------------------------------------------
if (shot->IsMissile()) {
if (dlen < Radius()) {
hull_impact = impact = shot_loc;
sim->CreateExplosion(impact, Velocity(), Explosion::HULL_FLASH, 0.3f * scale, scale, region, this);
sim->CreateExplosion(impact, Point(), Explosion::SHOT_BLAST, 2.0f, scale, region);
hit_type = HIT_HULL;
}
}
// ENERGY WEP PROCESSING ---------------------------------------------
else {
Solid* solid = (Solid*) rep;
Point shot_loc = shot->Location();
Point shot_vpn = shot_loc - shot->Origin();
double shot_len = shot_vpn.Normalize();
if (shot_len == 0) shot_len = 1000;
// impact:
if (solid) {
if (solid->CheckRayIntersection(shot->Origin(), shot_vpn, shot_len, impact)) {
// trim beam shots to impact point:
if (shot->IsBeam())
shot->SetBeamPoints(shot->Origin(), impact);
hull_impact = impact;
if (shot->IsBeam())
sim->CreateExplosion(impact, Velocity(), Explosion::BEAM_FLASH, 0.30f * scale, scale, region, this);
else
sim->CreateExplosion(impact, Velocity(), Explosion::HULL_FLASH, 0.30f * scale, scale, region, this);
Point burst_vel = hull_impact - Location();
burst_vel.Normalize();
burst_vel *= Radius() * 0.5;
burst_vel += Velocity();
sim->CreateExplosion(hull_impact, burst_vel, Explosion::HULL_BURST, 0.50f * scale, scale, region, this);
hit_type = HIT_HULL;
hit_hull = true;
}
}
else {
if (dlen < Radius()) {
hull_impact = impact = shot_loc;
if (shot->IsBeam())
sim->CreateExplosion(impact, Velocity(), Explosion::BEAM_FLASH, 0.30f * scale, scale, region, this);
else
sim->CreateExplosion(impact, Velocity(), Explosion::HULL_FLASH, 0.30f * scale, scale, region, this);
hit_type = HIT_HULL;
}
}
}
// DAMAGE RESOLUTION -------------------------------------------------
if (hit_type != HIT_NOTHING) {
double effective_damage = shot->Damage() * dscale;
if (shot->IsBeam()) {
effective_damage *= Clock::GetInstance()->Delta();
}
else {
ApplyTorque(shot->Velocity() * (float) effective_damage * 1e-6f);
}
if (effective_damage > 0)
Physical::InflictDamage(effective_damage);
}
return hit_type;
}
// +--------------------------------------------------------------------+
void
Debris::ExecFrame(double seconds)
{
if (GetRegion()->Type() == SimRegion::AIR_SPACE) {
if (AltitudeAGL() < Radius()) {
velocity = Point();
arcade_velocity = Point();
Terrain* terrain = region->GetTerrain();
if (terrain) {
Point loc = Location();
MoveTo(Point(loc.x, terrain->Height(loc.x, loc.z), loc.z));
}
}
else {
if (mass > 100) {
Orbital* primary = GetRegion()->GetOrbitalRegion()->Primary();
const double GRAV = 6.673e-11;
double m0 = primary->Mass();
double r = primary->Radius();
SetDrag(0.001);
SetGravity(6 * GRAV * m0 / (r*r)); // accentuate gravity
SetBaseDensity(1.0f);
}
AeroFrame(seconds);
}
}
else {
Physical::ExecFrame(seconds);
}
}
// +--------------------------------------------------------------------+
double
Debris::AltitudeAGL() const
{
Point loc = Location();
double altitude_agl = loc.y;
Terrain* terrain = region->GetTerrain();
if (terrain)
altitude_agl -= terrain->Height(loc.x, loc.z);
if (!_finite(altitude_agl))
altitude_agl = 0;
return altitude_agl;
}
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