[pitivi] track.py, curve.py: when creating keyframes, calculate value so that it lies

[Edward Hervey <edwardrv src gnome org>]

commit ed0173e51511642f0d228856e1186e6a6d172114
Author: Brandon Lewis <brandon_lewis berkeley edu>
Date:   Mon Aug 3 16:52:53 2009 -0700

    track.py, curve.py: when creating keyframes, calculate value so that it lies
    on the existing curve. fixes bug 589815

 pitivi/timeline/track.py |    7 ++-----
 pitivi/ui/curve.py       |    2 +-
 2 files changed, 3 insertions(+), 6 deletions(-)
---
diff --git a/pitivi/timeline/track.py b/pitivi/timeline/track.py
index a951095..4c338ae 100644
--- a/pitivi/timeline/track.py
+++ b/pitivi/timeline/track.py
@@ -180,12 +180,9 @@ class Interpolator(Signallable, Loggable):
         if isinstance(time_or_keyframe, Keyframe):
             keyframe = time_or_keyframe
         else:
-            # TODO: calculate value so that the new point doesn't change the shape
-            # of the curve when added. This might be tricky to achieve with cubic
-            # interpolation, but should work fine for linear and step
-            # interpolation.
             if value is None:
-                value = self._default
+                value = self._controller.get(self._property.name,
+                    time_or_keyframe)
             if mode is None:
                 # FIXME: Controller.get_interpolation_mode is not wrapped in
                 # gst-python, so for now we assume the default is linear.
diff --git a/pitivi/ui/curve.py b/pitivi/ui/curve.py
index f8c0073..d1acbc4 100644
--- a/pitivi/ui/curve.py
+++ b/pitivi/ui/curve.py
@@ -92,7 +92,7 @@ class Curve(goocanvas.ItemSimple, goocanvas.Item, View, Zoomable):
             if kf is None:
                 time, value = self.xyToTimeValue(pos)
                 self._view.app.action_log.begin("add volume point")
-                interpolator.newKeyframe(time, value)
+                interpolator.newKeyframe(time)
                 self._view.app.action_log.commit()
             else:
                 self._view.app.action_log.begin("remove volume point")