1 files changed, 150 insertions, 0 deletions
diff --git a/Stars45/SimObject.cpp b/Stars45/SimObject.cpp
new file mode 100644
index 0000000..01a69f6
--- /dev/null
+++ b/Stars45/SimObject.cpp
@@ -0,0 +1,150 @@
+/*  Project Starshatter 4.5
+    Destroyer Studios LLC
+    Copyright © 1997-2004. All Rights Reserved.
+
+    SUBSYSTEM:    Stars.exe
+    FILE:         SimObject.cpp
+    AUTHOR:       John DiCamillo
+
+
+    OVERVIEW
+    ========
+    Simulation Object and Observer classes
+*/
+
+#include "MemDebug.h"
+#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(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;
+}
+