initial commit and version 1.0

moviepy/video/fx/Blink.py

@@ -0,0 +1,27 @@
+from dataclasses import dataclass
+
+from moviepy.Effect import Effect
+
+
+@dataclass
+class Blink(Effect):
+    """
+    Makes the clip blink. At each blink it will be displayed ``duration_on``
+    seconds and disappear ``duration_off`` seconds. Will only work in
+    composite clips.
+    """
+
+    duration_on: float
+    duration_off: float
+
+    def apply(self, clip):
+        """Apply the effect to the clip."""
+        if clip.mask is None:
+            clip = clip.with_mask()
+
+        duration = self.duration_on + self.duration_off
+        clip.mask = clip.mask.transform(
+            lambda get_frame, t: get_frame(t) * ((t % duration) < self.duration_on)
+        )
+
+        return clip