1 files changed, 36 insertions, 0 deletions
diff --git a/FSF-2020/calculus-of-several-variables/geometry-of-planes-and-curves/velocity-and-differentiability/file2_non_differentiable.py b/FSF-2020/calculus-of-several-variables/geometry-of-planes-and-curves/velocity-and-differentiability/file2_non_differentiable.py
new file mode 100644
index 0000000..a91da6b
--- /dev/null
+++ b/FSF-2020/calculus-of-several-variables/geometry-of-planes-and-curves/velocity-and-differentiability/file2_non_differentiable.py
@@ -0,0 +1,36 @@
+from manimlib.imports import *
+
+class nd(Scene):
+    def construct(self):
+        ld1 = Line().rotate(20*DEGREES)
+        pd1 = Dot(ld1.get_end(), fill_opacity = 0)
+        pd1.set_stroke(width = 0.5)
+        ld2 = Line().rotate(40*DEGREES).shift(1.4*UP + 1.7*RIGHT)
+        pd2 = Dot(ld2.get_start(), fill_opacity  = 1, color = PURPLE)
+        t1 = TextMobject('A discontinuous function.').scale(0.7).shift(UP + 2*RIGHT)
+
+        obj1 = VGroup(*[ld1, pd1, ld2, pd2]).shift(4*LEFT)
+        self.play(FadeIn(obj1), FadeIn(t1))
+        self.wait(2)
+
+        ld3 = ld2.copy().rotate(-60*DEGREES).shift(1.4*DOWN + 0.2*RIGHT)
+        pd3 = Dot(ld1.get_end(), fill_opacity  = 1, color = PURPLE)
+        t2 = TextMobject('Graph containing a sharp corner.').scale(0.7).shift( 2*RIGHT)
+
+        obj2 = VGroup(*[ld3, pd3])
+
+        self.play(Transform(VGroup(*[ld2, pd2]), obj2), ReplacementTransform(t1, t2))
+
+        self.wait(2)
+
+        ld4 = Line().rotate(90*DEGREES)
+        pd4 = Dot(ld4.get_center(), color = PURPLE)
+        a1 = Arc(start_angle = -180*DEGREES, angle = 90*DEGREES).move_to(ld4.get_end()).rotate(-90*DEGREES).shift(0.5*(UP+RIGHT))
+        a2 = Arc(start_angle = -180*DEGREES, angle = 90*DEGREES).move_to(ld4.get_start()).rotate(90*DEGREES).shift(0.5*(DOWN+LEFT))
+        t3 = TextMobject('Graph with a vertical line.').scale(0.7).shift(2*RIGHT)
+
+        obj3 = VGroup(*[ld4, pd4, a1, a2]).shift(3*LEFT)
+
+        self.play(FadeOut(obj1), Transform(obj2, obj3), ReplacementTransform(t2, t3))
+        self.wait(2)
+        self.play(FadeOut(obj2), FadeOut(t3))