Move activity tracking to a separate class

[netvis.git] / source / activity.cpp

diff --git a/source/activity.cpp b/source/activity.cpp
new file mode 100644 (file)
index 0000000..05a4892
--- /dev/null
+++ b/source/activity.cpp
@@ -0,0 +1,30 @@
+#include <cmath>
+#include <msp/time/units.h>
+#include "activity.h"
+
+using namespace Msp;
+
+Activity::Activity():
+       average(0)
+{ }
+
+void Activity::add_bytes(unsigned n)
+{
+       // Scale for correct integral
+       average += n*0.06935;
+}
+
+void Activity::tick(const Time::TimeDelta &dt)
+{
+       static Time::TimeDelta last_dt;
+       static float decay = 0;
+
+       if(dt!=last_dt)
+       {
+               // Half-life in 10 seconds
+               decay = pow(0.933f, dt/Time::sec);
+               last_dt = dt;
+       }
+
+       average *= decay;
+}