Reorganized files for 3b1b videos into a 3b1b_projects folder

3b1b_projects/old/clacks/solution2/block_collision_scenes.py

@@ -0,0 +1,76 @@
+from manimlib.imports import *
+from old_projects.clacks.question import BlocksAndWallExample
+
+
+class PreviousTwoVideos(BlocksAndWallExample):
+    CONFIG = {
+        "sliding_blocks_config": {
+            "block1_config": {
+                "mass": 1e2,
+                "velocity": -2,
+                "width": 4,
+                "distance": 8,
+            },
+            "block2_config": {
+                "width": 4,
+                "distance": 3,
+            },
+        },
+        "floor_y": -3,
+        "wait_time": 15,
+    }
+
+    def setup(self):
+        super().setup()
+        blocks = self.blocks
+        videos = Group(
+            ImageMobject("ClacksSolution1Thumbnail"),
+            ImageMobject("ClacksQuestionThumbnail"),
+        )
+        for n, video, block in zip([2, 1], videos, blocks):
+            block.fade(1)
+            video.add(SurroundingRectangle(
+                video, buff=0,
+                color=BLUE,
+                stroke_width=3,
+            ))
+            video.replace(block)
+
+            title = TextMobject("Part {}".format(n))
+            title.scale(1.5)
+            title.next_to(video, UP, MED_SMALL_BUFF)
+            video.add(title)
+
+        def update_videos(videos):
+            for video, block in zip(videos, blocks):
+                video.move_to(block, DOWN)
+                video.shift(0.04 * UP)
+
+        videos.add_updater(update_videos)
+        self.add(videos)
+        if self.show_flash_animations:
+            self.add(self.clack_flashes.mobject)
+        self.videos = videos
+
+
+class IntroducePreviousTwoVideos(PreviousTwoVideos):
+    CONFIG = {
+        "show_flash_animations": False,
+        "include_sound": False,
+    }
+
+    def construct(self):
+        blocks = self.blocks
+        videos = self.videos
+
+        self.remove(blocks)
+        videos.clear_updaters()
+        self.remove(videos)
+
+        self.play(FadeInFromLarge(videos[1]))
+        self.play(TransformFromCopy(
+            videos[0].copy().fade(1).shift(2 * RIGHT),
+            videos[0],
+            rate_func=lambda t: rush_into(t, 3),
+        ))
+        # self.wait()