From 43a583fc4fe559df11fa60e226de71c59b2130bf Mon Sep 17 00:00:00 2001
From: Grant Sanderson <grant@3blue1brown.com>
Date: Fri, 25 Jan 2019 11:47:55 -0800
Subject: [PATCH] Beginning clacks_solution2 animations

---
 .../solution2/block_collision_scenes.py       | 63 +++++++++++++++++++
 .../clacks/solution2/pi_creature_scenes.py    |  6 ++
 .../clacks/solution2/simple_scenes.py         | 17 +++++
 active_projects/clacks_solution2.py           |  6 ++
 4 files changed, 92 insertions(+)
 create mode 100644 active_projects/clacks/solution2/block_collision_scenes.py
 create mode 100644 active_projects/clacks/solution2/pi_creature_scenes.py
 create mode 100644 active_projects/clacks/solution2/simple_scenes.py
 create mode 100644 active_projects/clacks_solution2.py

diff --git a/active_projects/clacks/solution2/block_collision_scenes.py b/active_projects/clacks/solution2/block_collision_scenes.py
new file mode 100644
index 00000000..3a54fed5
--- /dev/null
+++ b/active_projects/clacks/solution2/block_collision_scenes.py
@@ -0,0 +1,63 @@
+from big_ol_pile_of_manim_imports import *
+from active_projects.clacks.question import BlocksAndWallExample
+
+
+class PreviousTwoVideos(BlocksAndWallExample):
+    CONFIG = {
+        "sliding_blocks_config": {
+            "block1_config": {
+                "mass": 1e4,
+                "velocity": -2,
+                "width": 3,
+            },
+            "block2_config": {
+                "width": 3,
+            },
+        },
+        "wait_time": 15,
+    }
+
+    def setup(self):
+        videos = Group(
+            ImageMobject
+        )
+
+        name_mobs = VGroup(*map(TextMobject, names))
+        name_mobs.set_stroke(BLACK, 3, background=True)
+        name_mobs.set_fill(LIGHT_GREY, 1)
+        name_mobs.set_sheen(3, UL)
+        name_mobs.scale(2)
+        configs = [
+            self.sliding_blocks_config["block1_config"],
+            self.sliding_blocks_config["block2_config"],
+        ]
+        for name_mob, config in zip(name_mobs, configs):
+            config["width"] = name_mob.get_width()
+        self.name_mobs = name_mobs
+
+        super().setup()
+
+    def add_blocks(self):
+        super().add_blocks()
+        blocks = self.blocks
+        name_mobs = self.name_mobs
+
+        blocks.fade(1)
+
+        def update_name_mobs(name_mobs):
+            for name_mob, block in zip(name_mobs, self.blocks):
+                name_mob.move_to(block)
+                target_y = block.get_bottom()[1] + SMALL_BUFF
+                curr_y = name_mob[0].get_bottom()[1]
+                name_mob.shift((target_y - curr_y) * UP)
+
+        name_mobs.add_updater(update_name_mobs)
+        self.add(name_mobs)
+
+        clack_y = self.name_mobs[1].get_center()[1]
+        for location, time in self.clack_data:
+            location[1] = clack_y
+
+        for block, name_mob in zip(blocks, name_mobs):
+            block.label.next_to(name_mob, UP)
+            block.label.set_fill(YELLOW, opacity=1)
diff --git a/active_projects/clacks/solution2/pi_creature_scenes.py b/active_projects/clacks/solution2/pi_creature_scenes.py
new file mode 100644
index 00000000..b6c3492e
--- /dev/null
+++ b/active_projects/clacks/solution2/pi_creature_scenes.py
@@ -0,0 +1,6 @@
+from big_ol_pile_of_manim_imports import *
+
+
+class NewSceneName(TeacherStudentsScene):
+    def construct(self):
+        pass
diff --git a/active_projects/clacks/solution2/simple_scenes.py b/active_projects/clacks/solution2/simple_scenes.py
new file mode 100644
index 00000000..955f5503
--- /dev/null
+++ b/active_projects/clacks/solution2/simple_scenes.py
@@ -0,0 +1,17 @@
+from big_ol_pile_of_manim_imports import *
+from active_projects.clacks.question import BlocksAndWallExample
+
+
+class PreviousTwoVideos(BlocksAndWallExample):
+    CONFIG = {
+        "sliding_blocks_config": {
+            "block1_config": {
+                "mass": 1e0,
+                "velocity": -2,
+            }
+        },
+        "wait_time": 15,
+    }
+
+    def construct(self):
+        pass
diff --git a/active_projects/clacks_solution2.py b/active_projects/clacks_solution2.py
new file mode 100644
index 00000000..6840c08d
--- /dev/null
+++ b/active_projects/clacks_solution2.py
@@ -0,0 +1,6 @@
+from active_projects.clacks.solution2 import block_collision_scenes
+
+OUTPUT_DIRECTORY = "clacks_solution2"
+ALL_SCENE_CLASSES = [
+    block_collision_scenes.PreviousTwoVideos
+]