virtualize the way that AutomationController gets strings to display values, so that we can callback through the owner of an AutomationControl, not just rely on the value from the AutomationControl; make pan automation tracks use this to display more audio-centric values

git-svn-id: svn://localhost/ardour2/branches/3.0@8590 d708f5d6-7413-0410-9779-e7cbd77b26cf

2 files changed, 28 insertions, 0 deletions

diff --git a/libs/panners/2in2out/panner_2in2out.cc b/libs/panners/2in2out/panner_2in2out.cc
index 2c2856361c..30d971d118 100644
--- a/libs/panners/2in2out/panner_2in2out.cc
+++ b/libs/panners/2in2out/panner_2in2out.cc
@@ -473,3 +473,30 @@ Panner2in2out::describe_parameter (Evoral::Parameter p)
                 return _pannable->describe_parameter (p);
         }
 }
+
+string 
+Panner2in2out::value_as_string (boost::shared_ptr<AutomationControl> ac) const
+{
+        /* DO NOT USE LocaleGuard HERE */
+        double val = ac->get_value();
+
+        switch (ac->parameter().type()) {
+        case PanAzimuthAutomation:
+                /* We show the position of the center of the image relative to the left & right.
+                   This is expressed as a pair of percentage values that ranges from (100,0) 
+                   (hard left) through (50,50) (hard center) to (0,100) (hard right).
+                   
+                   This is pretty wierd, but its the way audio engineers expect it. Just remember that
+                   the center of the USA isn't Kansas, its (50LA, 50NY) and it will all make sense.
+                */
+                
+                return string_compose (_("L:%1 R:%2"), (int) rint (100.0 * (1.0 - val)),
+                                       (int) rint (100.0 * val));
+                
+        case PanWidthAutomation:
+                return string_compose (_("Width: %1%%"), (int) floor (100.0 * val));
+                
+        default:
+                return _pannable->value_as_string (ac);
+        }
+}
diff --git a/libs/panners/2in2out/panner_2in2out.h b/libs/panners/2in2out/panner_2in2out.h
index 0bb38fa27f..2014bb032e 100644
--- a/libs/panners/2in2out/panner_2in2out.h
+++ b/libs/panners/2in2out/panner_2in2out.h
@@ -60,6 +60,7 @@ class Panner2in2out : public Panner
 	static Panner* factory (boost::shared_ptr<Pannable>, Speakers&);
 
         std::string describe_parameter (Evoral::Parameter);
+        std::string value_as_string (boost::shared_ptr<AutomationControl>) const;
 
 	XMLNode& state (bool full_state); 
 	XMLNode& get_state (void);