Basic rocket timeline

Author: einarf

demosys/timeline/rocket.py

@@ -0,0 +1,36 @@
+from .base import BaseTimeline
+
+
+class Timeline(BaseTimeline):
+    """
+    At attempt to use rocket data as our timeline.
+    We use rocket track values of 0 and 1 deciding if the effect should be active.
+    Only runnable effects will be used.
+    Each effect should also have some way to specify its draw priority
+
+    The following class attributes must be specified on the effect:
+
+        rocket_timeline_track = Track instance
+        rocket_timeline_order = 0
+
+    Effects are drawn in the user-defined order.
+
+    We might want to eventually convert this timeline data into a more managable format
+    internally in the timeline because rocket tracks are not ideal for 
+    """
+    def __init__(self, project, *args, **kwargs):
+        super().__init__(project)
+
+        # Get all runnable effect sorting them by rocket_timeline_order
+        self.effects = self._project.get_runnable_effects()
+        self.effects.sort(key=lambda x: x.rocket_timeline_order)
+
+    def draw(self, time, frametime, target):
+        """
+        Fetch track value for every runnable effect.
+        If the value is > 0.5 we draw it.
+        """
+        for effect in self.effects:
+            value = effect.rocket_timeline_track.time_value(time)
+            if value > 0.5:
+                effect.draw(time, frametime, target)