fix IndirectInterval not to start/stop sounds repeatedly

direct/src/interval/IndirectInterval.py

@@ -2,9 +2,10 @@
 
 from PandaModules import *
 from DirectNotifyGlobal import *
-import LerpInterval
+import Interval
+import LerpBlendHelpers
 
-class IndirectInterval(LerpInterval.LerpFunctionInterval):
+class IndirectInterval(Interval.Interval):
     """
     This class can be used to play samples of another interval, so
     that only a subset of the interval is played, or the time is
@@ -28,6 +29,9 @@ class IndirectInterval(LerpInterval.LerpFunctionInterval):
                  duration = None, blendType = 'noBlend', name = None):
         self.interval = interval
 
+        self.startAtStart = (startT == 0)
+        self.endAtEnd = (endT == None or endT == interval.getDuration())
+        
         if endT == None:
             endT = interval.getDuration()
 
@@ -39,10 +43,92 @@ class IndirectInterval(LerpInterval.LerpFunctionInterval):
                     IndirectInterval.indirectIntervalNum)
             IndirectInterval.indirectIntervalNum += 1
 
-        LerpInterval.LerpFunctionInterval.__init__(
-            self, self.__step, fromData = startT, toData = endT,
-            duration = duration, blendType = blendType, name = name)
+        self.startT = startT
+        self.endT = endT
+        self.deltaT = endT - startT
+        self.blendType = LerpBlendHelpers.getBlend(blendType)
 
-    def __step(self, t):
-        self.interval.setT(t)
+        Interval.Interval.__init__(self, name, duration)
 
+    def __calcT(self, t):
+        return self.startT + self.deltaT * self.blendType(t / self.duration)
+
+    def privInitialize(self, t):
+        state = self.interval.getState()
+        if state == CInterval.SInitial or state == CInterval.SFinal:
+            self.interval.privInitialize(self.__calcT(t))
+        else:
+            self.interval.privStep(self.__calcT(t))
+        self.currT = t
+        self.state = CInterval.SStarted
+        self.interval.privPostEvent()
+
+    def privInstant(self):
+        state = self.interval.getState()
+        if (state == CInterval.SInitial or state == CInterval.SFinal) and \
+           self.endAtEnd:
+            self.interval.privInstant()
+            self.currT = self.getDuration()
+            self.interval.privPostEvent()
+            self.intervalDone()
+        else:
+            if state == CInterval.SInitial or state == CInterval.SFinal:
+                self.interval.privInitialize(self.startT)
+            else:
+                self.interval.privStep(self.startT)
+            self.privFinalize()
+
+    def privStep(self, t):
+        self.interval.privStep(self.__calcT(t))
+        self.currT = t
+        self.state = CInterval.SStarted
+        self.interval.privPostEvent()
+
+    def privFinalize(self):
+        if self.endAtEnd:
+            self.interval.privFinalize()
+        else:
+            self.interval.privStep(self.endT)
+            self.interval.privInterrupt()
+        self.currT = self.getDuration()
+        self.state = CInterval.SFinal
+        self.interval.privPostEvent()
+        self.intervalDone()
+
+    def privReverseInitialize(self, t):
+        state = self.interval.getState()
+        if state == CInterval.SInitial or state == CInterval.SFinal:
+            self.interval.privReverseInitialize(self.__calcT(t))
+        else:
+            self.interval.privStep(self.__calcT(t))
+        self.currT = t
+        self.state = CInterval.SStarted
+        self.interval.privPostEvent()
+
+    def privReverseInstant(self):
+        state = self.interval.getState()
+        if (state == CInterval.SInitial or state == CInterval.SFinal) and \
+           self.startAtStart:
+            self.interval.privReverseInstant()
+            self.currT = 0
+            self.interval.privPostEvent()
+        else:
+            if state == CInterval.SInitial or state == CInterval.SFinal:
+                self.interval.privReverseInitialize(self.endT)
+            else:
+                self.interval.privStep(self.endT)
+            self.privReverseFinalize()
+
+    def privReverseFinalize(self):
+        if self.startAtStart:
+            self.interval.privReverseFinalize()
+        else:
+            self.interval.privStep(self.endT)
+            self.interval.privInterrupt()
+        self.currT = 0
+        self.state = CInterval.SInitial
+        self.interval.privPostEvent()
+
+    def privInterrupt(self):
+        self.interval.privInterrupt()
+        self.interval.privPostEvent()

direct/src/interval/LerpInterval.py

@@ -383,7 +383,7 @@ class LerpFunctionInterval(Interval.Interval):
         self.function = function
         self.fromData = fromData
         self.toData = toData
-        self.blendType = self.getBlend(blendType)
+        self.blendType = LerpBlendHelpers.getBlend(blendType)
         self.extraArgs = extraArgs
         # Generate unique name if necessary
         if (name == None):
@@ -412,23 +412,6 @@ class LerpFunctionInterval(Interval.Interval):
         self.state = CInterval.SStarted
         self.currT = t
 
-    def getBlend(self, blendType):
-        """__getBlend(self, string)
-        Return the C++ blend class corresponding to blendType string
-        """
-        # Note, this is temporary until blend functions get exposed
-        if (blendType == "easeIn"):
-            return LerpBlendHelpers.easeIn
-        elif (blendType == "easeOut"):
-            return LerpBlendHelpers.easeOut
-        elif (blendType == "easeInOut"):
-            return LerpBlendHelpers.easeInOut
-        elif (blendType == "noBlend"):
-            return LerpBlendHelpers.noBlend
-        else:
-            raise Exception(
-                'Error: LerpInterval.__getBlend: Unknown blend type')
-
 # New interface
 class LerpFunc(LerpFunctionInterval):
     def __init__(self, *args, **kw):

direct/src/showbase/LerpBlendHelpers.py

@@ -11,3 +11,21 @@ easeOut = EaseOutBlendType()
 easeInOut = EaseInOutBlendType()
 
 noBlend = NoBlendType()
+
+            
+def getBlend(blendType):
+    """__getBlend(string)
+    Return the C++ blend class corresponding to blendType string
+    """
+    # Note, this is temporary until blend functions get exposed
+    if (blendType == "easeIn"):
+        return easeIn
+    elif (blendType == "easeOut"):
+        return easeOut
+    elif (blendType == "easeInOut"):
+        return easeInOut
+    elif (blendType == "noBlend"):
+        return noBlend
+    else:
+        raise Exception(
+            'Error: LerpInterval.__getBlend: Unknown blend type')