Moved Stars45 to StarsEx

1 files changed, 364 insertions, 0 deletions

diff --git a/StarsEx/Contact.cpp b/StarsEx/Contact.cpp
new file mode 100644
index 0000000..2dbec5a
--- /dev/null
+++ b/StarsEx/Contact.cpp
@@ -0,0 +1,364 @@
+/*  Starshatter: The Open Source Project
+    Copyright (c) 2021-2022, 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
+    ========
+    Integrated (Passive and Active) Sensor Package class implementation
+*/
+
+#include "Contact.h"
+#include "Drone.h"
+#include "Sensor.h"
+#include "Ship.h"
+#include "Sim.h"
+#include "WeaponDesign.h"
+
+#include "Game.h"
+#include "Clock.h"
+
+// +----------------------------------------------------------------------+
+
+const int      DEFAULT_TRACK_UPDATE = 500; // milliseconds
+const int      DEFAULT_TRACK_LENGTH =  20; // 10 seconds
+const double   DEFAULT_TRACK_AGE    =  10; // 10 seconds
+const double   SENSOR_THRESHOLD     = 0.25;
+
+// +----------------------------------------------------------------------+
+
+Contact::Contact()
+: ship(0), shot(0), d_pas(0.0f), d_act(0.0f),
+track(0), ntrack(0), time(0), track_time(0), probe(false)
+{
+    acquire_time = Clock::GetInstance()->GameTime();
+}
+
+Contact::Contact(Ship* s, float p, float a)
+: ship(s), shot(0), d_pas(p), d_act(a),
+track(0), ntrack(0), time(0), track_time(0), probe(false)
+{
+    acquire_time = Clock::GetInstance()->GameTime();
+    Observe(ship);
+}
+
+Contact::Contact(Shot* s, float p, float a)
+: ship(0), shot(s), d_pas(p), d_act(a),
+track(0), ntrack(0), time(0), track_time(0), probe(false)
+{
+    acquire_time = Clock::GetInstance()->GameTime();
+    Observe(shot);
+}
+
+// +----------------------------------------------------------------------+
+
+Contact::~Contact()
+{
+    delete [] track;
+}
+
+// +----------------------------------------------------------------------+
+
+int
+Contact::operator == (const Contact& c) const
+{
+    if (ship)
+    return ship == c.ship;
+
+    else if (shot)
+    return shot == c.shot;
+
+    return 0;
+}
+
+// +----------------------------------------------------------------------+
+
+bool
+Contact::Update(SimObject* obj)
+{
+    if (obj == ship || obj == shot) {
+        ship  = 0;
+        shot  = 0;
+        d_act = 0;
+        d_pas = 0;
+
+        ClearTrack();
+    }
+
+    return SimObserver::Update(obj);
+}
+
+const char*
+Contact::GetObserverName() const
+{
+    static char name[128];
+
+    if (ship)
+        sprintf_s(name, "Contact Ship='%s'", ship->Name());
+    else if (shot)
+        sprintf_s(name, "Contact Shot='%s' %s", shot->Name(), shot->DesignName());
+    else
+        sprintf_s(name, "Contact (unknown)");
+
+    return name;
+}
+
+// +----------------------------------------------------------------------+
+
+double
+Contact::Age() const
+{
+    double age = 0;
+
+    if (!ship && !shot)
+    return age;
+
+    double seconds = (Clock::GetInstance()->GameTime() - time) / 1000.0;
+
+    age = 1.0 - seconds/DEFAULT_TRACK_AGE;
+
+    if (age < 0)
+    age = 0;
+
+    return age;
+}
+
+int
+Contact::GetIFF(const Ship* observer) const
+{
+    int i = 0;
+
+    if (ship) {
+        i = ship->GetIFF();
+
+        // if the contact is on our side or has locked us up,
+        // we know whose side he's on.
+
+        // Otherwise:
+        if (i != observer->GetIFF() && !Threat(observer)) {
+            if (d_pas < 2*SENSOR_THRESHOLD && d_act < SENSOR_THRESHOLD && !Visible(observer))
+            i = -1000;   // indeterminate iff reading
+        }
+    }
+
+    else if (shot && shot->Owner()) {
+        i = shot->Owner()->GetIFF();
+    }
+
+    return i;
+}
+
+bool
+Contact::ActLock() const
+{
+    return d_act >= SENSOR_THRESHOLD;
+}
+
+bool
+Contact::PasLock() const
+{
+    return d_pas >= SENSOR_THRESHOLD;
+}
+
+// +----------------------------------------------------------------------+
+
+void
+Contact::GetBearing(const Ship* observer, double& az, double& el, double& rng) const
+{
+    // translate:
+    Point targ_pt = loc - observer->Location();
+
+    // rotate:
+    const Camera* cam = &observer->Cam();
+    double        tx  = targ_pt * cam->vrt();
+    double        ty  = targ_pt * cam->vup();
+    double        tz  = targ_pt * cam->vpn();
+
+    // convert to spherical coords:
+    rng = targ_pt.length();
+    az  = asin(fabs(tx) / rng);
+    el  = asin(fabs(ty) / rng);
+
+    if (tx < 0) az = -az;
+    if (ty < 0) el = -el;
+
+    // correct az/el for back hemisphere:
+    if (tz < 0) {
+        if (az < 0) az = -PI - az;
+        else        az =  PI - az;
+    }
+}
+
+double
+Contact::Range(const Ship* observer, double limit) const
+{
+    double r = Point(loc - observer->Location()).length();
+
+    // if passive only, return approximate range:
+    if (!ActLock()) {
+        const int chunk = 25000;
+
+        if (!PasLock()) {
+            r = (int) limit;
+        }
+
+        else if (r <= chunk) {
+            r = chunk;
+        }
+
+        else {
+            int r1 = (int) (r + chunk/2) / chunk;
+            r = r1 * chunk;
+        }
+    }
+
+    return r;
+}
+
+// +----------------------------------------------------------------------+
+
+bool
+Contact::InFront(const Ship* observer) const
+{
+    // translate:
+    Point targ_pt = loc - observer->Location();
+
+    // rotate:
+    const Camera* cam = &observer->Cam();
+    double tz = targ_pt * cam->vpn();
+
+    if (tz > 1.0)
+    return true;
+
+    return false;
+}
+
+bool
+Contact::Threat(const Ship* observer) const
+{
+    bool threat = false;
+
+    if (observer && observer->Life() != 0) {
+        if (ship && ship->Life() != 0) {
+            threat = (ship->GetIFF() &&
+            ship->GetIFF() != observer->GetIFF() &&
+            ship->GetEMCON() > 2 &&
+            ship->IsTracking((Ship*) observer) &&
+            ship->Weapons().size() > 0);
+
+            if (threat && observer->GetIFF() == 0)
+            threat = ship->GetIFF() > 1;
+        }
+
+        else if (shot) {
+            threat = shot->IsTracking((Ship*) observer);
+
+            if (!threat && shot->Design()->probe && shot->GetIFF() != observer->GetIFF()) {
+                Point  probe_pt = shot->Location() - observer->Location();
+                double prng     = probe_pt.length();
+
+                threat = (prng < shot->Design()->lethal_radius);
+            }
+        }
+    }
+
+    return threat;
+}
+
+bool
+Contact::Visible(const Ship* observer) const
+{
+    // translate:
+    Point targ_pt = loc - observer->Location();
+    double radius = 0;
+
+    if (ship)
+    radius = ship->Radius();
+
+    else if (shot)
+    radius = shot->Radius();
+
+    // rotate:
+    const Camera* cam = &observer->Cam();
+    double        rng = targ_pt.length();
+
+    return radius/rng > 0.002;
+}
+
+// +----------------------------------------------------------------------+
+
+void
+Contact::Reset()
+{
+    if (Game::GetInstance()->Paused()) return;
+
+    float step_down = (float) (Clock::GetInstance()->Delta() / 10);
+
+    if (d_pas > 0)
+    d_pas -= step_down;
+
+    if (d_act > 0)
+    d_act -= step_down;
+}
+
+void
+Contact::Merge(Contact* c)
+{
+    if (c->GetShip() == ship && c->GetShot() == shot) {
+        if (c->d_pas > d_pas)
+        d_pas = c->d_pas;
+
+        if (c->d_act > d_act)
+        d_act = c->d_act;
+    }
+}
+
+void
+Contact::ClearTrack()
+{
+    delete [] track;
+    track = 0;
+    ntrack = 0;
+}
+
+void
+Contact::UpdateTrack()
+{
+    time = Clock::GetInstance()->GameTime();
+
+    if (shot || (ship && ship->IsGroundUnit()))
+    return;
+
+    if (!track) {
+        track = new Point[DEFAULT_TRACK_LENGTH];
+        track[0] = loc;
+        ntrack   = 1;
+        track_time = time;
+    }
+
+    else if (time - track_time > DEFAULT_TRACK_UPDATE) {
+        if (loc != track[0]) {
+            for (int i = DEFAULT_TRACK_LENGTH-2; i >= 0; i--)
+            track[i+1] = track[i];
+
+            track[0] = loc;
+            if (ntrack < DEFAULT_TRACK_LENGTH) ntrack++;
+        }
+
+        track_time = time;
+    }
+}
+
+// +----------------------------------------------------------------------+
+
+Point
+Contact::TrackPoint(int i) const
+{
+    if (track && i < ntrack)
+    return track[i];
+
+    return Point();
+}