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

1 files changed, 24 insertions, 0 deletions

diff --git a/libs/panners/1in2out/panner_1in2out.cc b/libs/panners/1in2out/panner_1in2out.cc
index 7a59aa04cc..cce2ec9b71 100644
--- a/libs/panners/1in2out/panner_1in2out.cc
+++ b/libs/panners/1in2out/panner_1in2out.cc
@@ -362,3 +362,27 @@ Panner1in2out::describe_parameter (Evoral::Parameter p)
                 return _pannable->describe_parameter (p);
         }
 }
+
+string 
+Panner1in2out::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));
+                
+        default:
+                return _pannable->value_as_string (ac);
+        }
+}