From 1709c7afe41a96b079f3d34c9625d1a790dcc805 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Fri, 27 Mar 2015 09:04:54 +0200
Subject: [PATCH] Limit timestep to 10 milliseconds

The simulation still has some problems with detriggering sensors if a
train advances too much during a step.  This should alleviate the issue.
---
 source/libr2c2/layout.cpp | 8 ++++++++
 source/libr2c2/layout.h   | 4 ++++
 2 files changed, 12 insertions(+)

diff --git a/source/libr2c2/layout.cpp b/source/libr2c2/layout.cpp
index fe21881..70a9f10 100644
--- a/source/libr2c2/layout.cpp
+++ b/source/libr2c2/layout.cpp
@@ -425,6 +425,14 @@ void Layout::tick()
 		dt = t-last_tick;
 	last_tick = t;
 
+	unsigned count = dt/(10*Time::msec)+1;
+	dt /= count;
+	while(count--)
+		step(dt);
+}
+
+void Layout::step(const Time::TimeDelta &dt)
+{
 	if(!driver || !driver->is_halted())
 		clock.tick(dt);
 
diff --git a/source/libr2c2/layout.h b/source/libr2c2/layout.h
index a1c37d3..2488f93 100644
--- a/source/libr2c2/layout.h
+++ b/source/libr2c2/layout.h
@@ -5,6 +5,7 @@
 #include <set>
 #include <sigc++/sigc++.h>
 #include <msp/datafile/objectloader.h>
+#include <msp/time/timedelta.h>
 #include <msp/time/timestamp.h>
 #include "geometry.h"
 #include "sensor.h"
@@ -151,6 +152,9 @@ public:
 	void remove_train(Train &);
 
 	void tick();
+private:
+	void step(const Msp::Time::TimeDelta &);
+public:
 	void emergency(Block *, const std::string &);
 
 	void save(const std::string &) const;
-- 
2.43.0