Merge pull request #6 from FOSSEE/master

obtaining changes

1 files changed, 43 insertions, 0 deletions

diff --git a/FSF-2020/calculus-of-several-variables/triple-and-surface-integrals/flux/file1_flux_through_circle.py b/FSF-2020/calculus-of-several-variables/triple-and-surface-integrals/flux/file1_flux_through_circle.py
new file mode 100644
index 0000000..e418a96
--- /dev/null
+++ b/FSF-2020/calculus-of-several-variables/triple-and-surface-integrals/flux/file1_flux_through_circle.py
@@ -0,0 +1,43 @@
+from manimlib.imports import *
+def pendulum_vector_field_func(point):
+    #theta, omega = point[:2]
+    return np.array([
+        point[0],
+        point[1],
+        point[2],
+    ])
+class F2D(Scene):
+    CONFIG = {
+        # "func": cylinder_flow_vec or_field,
+        "flow_time": 5,
+    }
+    def initialize_vector_field(self):
+        self.vector_field = VectorField(
+            pendulum_vector_field_func,
+        )
+        self.vector_field.sort(get_norm)
+    def construct(self):
+        # plane = NumberPlane(color=RED)
+        # plane.add(plane.get_axis_labels()) 
+        # self.add(plane)  
+        self.initialize_vector_field()
+
+        field = self.vector_field
+        c1=Circle(radius=3,color=BLUE)
+        self.play(ShowCreation(field), run_time=7)
+        self.play(ShowCreation(c1))
+        self.wait(3)
+        lines = StreamLines(
+            pendulum_vector_field_func,
+            virtual_time=3,
+            min_magnitude=0,
+            max_magnitude=2,
+        )
+        self.add(AnimatedStreamLines(
+            lines,
+            line_anim_class=ShowPassingFlash
+        ))
+        self.wait(2)
+        phase_point = VectorizedPoint(1*UP+1*RIGHT)
+        self.add(move_along_vector_field(phase_point, pendulum_vector_field_func))
+        self.wait(2)