zoom in on BrickRowScene

active_projects/eop/chapter1/entire_brick_wall.py

@@ -3,7 +3,12 @@ from big_ol_pile_of_manim_imports import *
 from active_projects.eop.reusable_imports import *
 from active_projects.eop.chapter1.brick_row_scene import BrickRowScene
 
-class EntireBrickWall(BrickRowScene):
+class EntireBrickWall(BrickRowScene, MovingCameraScene):
+
+    def setup(self):
+        super(BrickRowScene, self).setup()
+        super(PiCreatureScene, self).setup()
+
 
     def construct(self):
 
@@ -45,7 +50,6 @@ class EntireBrickWall(BrickRowScene):
             rows.submobjects[-1] = self.merge_rects_by_coloring(rows[-1])
 
 
-
         # draw indices under the last row for the number of tails
         tails_counters = VGroup()
         for (i, rect) in enumerate(rows[-1].rects):
@@ -83,6 +87,7 @@ class EntireBrickWall(BrickRowScene):
         last_row_rect = SurroundingRectangle(rows[-1], buff = 0)
         last_row_rect.set_stroke(color = YELLOW, width = 6)
 
+        rows.save_state()
         self.play(
             rows.fade, 0.9,
             ShowCreation(last_row_rect)
@@ -102,24 +107,40 @@ class EntireBrickWall(BrickRowScene):
             highlighted_brick(row = 20, nb_tails = i)
             for i in range(20)
         ]
-
+        self.wait()
         self.play(
             FadeIn(highlighted_bricks[10])
         )
-
+        self.wait()
         self.play(
             FadeOut(highlighted_bricks[10]),
             FadeIn(highlighted_bricks[9]),
             FadeIn(highlighted_bricks[11]),
         )
-
+        self.wait()
         self.play(
             FadeOut(highlighted_bricks[9]),
             FadeOut(highlighted_bricks[11]),
             FadeIn(highlighted_bricks[8]),
             FadeIn(highlighted_bricks[12]),
         )
-
+        self.wait()
+        self.play(
+            FadeOut(highlighted_bricks[8]),
+            FadeOut(highlighted_bricks[12]),
+            FadeOut(last_row_rect),
+            rows.restore,
+        )
+        self.wait()
+        new_frame = self.camera_frame.copy()
+        new_frame.scale(0.0001).move_to(rows.get_corner(DR))
+
+        self.play(
+            Transform(self.camera_frame, new_frame,
+                run_time = 9,
+                rate_func = exponential_decay
+            )
+        )
 
 
 

active_projects/eop/reusables/brick_row.py

@@ -184,6 +184,7 @@ class SplitRectsInBrickWall(AnimationGroup):
 
     def __init__(self, mobject, **kwargs):
 
+        #print mobject.height, mobject.get_height()
         r = self.subdiv_level = mobject.subdiv_level + 1
         
         subdivs = VGroup()
@@ -196,6 +197,7 @@ class SplitRectsInBrickWall(AnimationGroup):
             subdiv = DashedLine(
                 mobject.get_top() + x * RIGHT,
                 mobject.get_bottom() + x * RIGHT,
+                dashed_segment_length = 0.05
             )
             subdivs.add(subdiv)
             anims.append(ShowCreation(subdiv))

utils/rate_functions.py

@@ -82,3 +82,24 @@ def squish_rate_func(func, a=0.4, b=0.6):
 
 def lingering(t):
     return squish_rate_func(lambda t: t, 0, 0.8)(t)
+
+def exponential_decay(t, half_life = 0.1):
+# The half-life should be rather small to minimize the cut-off error at the end
+    return 1 - np.exp(-t/half_life)
+
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