Moved Stars45 to StarsEx

1 files changed, 148 insertions, 0 deletions

diff --git a/StarsEx/SimObject.cpp b/StarsEx/SimObject.cpp
new file mode 100644
index 0000000..24fac59
--- /dev/null
+++ b/StarsEx/SimObject.cpp
@@ -0,0 +1,148 @@
+/*  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
+    ========
+    Simulation Object and Observer classes
+*/
+
+#include "SimObject.h"
+
+#include "Graphic.h"
+#include "Light.h"
+#include "Scene.h"
+
+// +--------------------------------------------------------------------+
+
+SimObserver::~SimObserver()
+{
+    ListIter<SimObject> observed = observe_list;
+    while (++observed)
+    observed->Unregister(this);
+}
+
+void
+SimObserver::Observe(SimObject* obj)
+{
+    if (obj) {
+        obj->Register(this);
+
+        if (!observe_list.contains(obj))
+        observe_list.append(obj);
+    }
+}
+
+void
+SimObserver::Ignore(SimObject* obj)
+{
+    if (obj) {
+        obj->Unregister(this);
+        observe_list.remove(obj);
+    }
+}
+
+bool
+SimObserver::Update(SimObject* obj)
+{
+    if (obj)
+    observe_list.remove(obj);
+
+    return true;
+}
+
+const char*
+SimObserver::GetObserverName() const
+{
+    static char name[32];
+    sprintf_s(name, "SimObserver 0x%08x", (DWORD) this);
+    return name;
+}
+
+// +--------------------------------------------------------------------+
+
+SimObject::~SimObject()
+{
+    Notify();
+}
+
+// +--------------------------------------------------------------------+
+
+void
+SimObject::Notify()
+{
+    if (!notifying) {
+        notifying = true;
+
+        int nobservers = observers.size();
+        int nupdate    = 0;
+
+        if (nobservers > 0) {
+            ListIter<SimObserver> iter = observers;
+            while (++iter) {
+                SimObserver* observer = iter.value();
+                observer->Update(this);
+                nupdate++;
+            }
+
+            observers.clear();
+        }
+
+        if (nobservers != nupdate) {
+            ::Print("WARNING: incomplete notify sim object '%s' - %d of %d notified\n",
+            Name(), nupdate, nobservers);
+        }
+
+        notifying = false;
+    }
+    else {
+        ::Print("WARNING: double notify on sim object '%s'\n", Name());
+    }
+}
+
+// +--------------------------------------------------------------------+
+
+void
+SimObject::Register(SimObserver* observer)
+{
+    if (!notifying && !observers.contains(observer))
+    observers.append(observer);
+}
+
+// +--------------------------------------------------------------------+
+
+void
+SimObject::Unregister(SimObserver* observer)
+{
+    if (!notifying)
+    observers.remove(observer);
+}
+
+// +--------------------------------------------------------------------+
+
+void
+SimObject::Activate(Scene& scene)
+{
+    if (rep)
+    scene.AddGraphic(rep);
+    if (light)
+    scene.AddLight(light);
+
+    active = true;
+}
+
+void
+SimObject::Deactivate(Scene& scene)
+{
+    if (rep)
+    scene.DelGraphic(rep);
+    if (light)
+    scene.DelLight(light);
+
+    active = false;
+}
+