Beginning Bell's and Waves projects

waves.py

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+from helpers import *
+
+from mobject.tex_mobject import TexMobject
+from mobject import Mobject
+from mobject.image_mobject import ImageMobject
+from mobject.vectorized_mobject import *
+
+from animation.animation import Animation
+from animation.transform import *
+from animation.simple_animations import *
+from animation.continual_animation import ContinualAnimation
+from animation.playground import *
+from topics.geometry import *
+from topics.characters import *
+from topics.functions import *
+from topics.fractals import *
+from topics.number_line import *
+from topics.combinatorics import *
+from topics.numerals import *
+from topics.three_dimensions import *
+from topics.objects import *
+from topics.probability import *
+from topics.complex_numbers import *
+from scene import Scene
+from scene.reconfigurable_scene import ReconfigurableScene
+from scene.zoomed_scene import *
+from camera import Camera
+from mobject.svg_mobject import *
+from mobject.tex_mobject import *
+
+E_COLOR = BLUE
+M_COLOR = RED
+
+class OscillatingVector(ContinualAnimation):
+    CONFIG = {
+        "tail" : ORIGIN,
+        "frequency" : 1,
+        "A_x" : 1,
+        "A_y" : 0,
+        "phi_x" : 0,
+        "phi_y" : 0,
+    }
+    def setup(self):
+        self.vector = self.mobject
+
+    def update_mobject(self, dt):
+        f = self.frequency
+        t = self.total_time
+        angle = 2*np.pi*f*t
+        vect = np.array([
+            self.A_x*np.exp(complex(0, angle + self.phi_x)),
+            self.A_y*np.exp(complex(0, angle + self.phi_y)),
+            0,
+        ]).real
+        self.vector.put_start_and_end_on(self.tail, self.tail+vect)
+
+
+class EMScene(Scene):
+    def construct(self):
+        pass
+
+
+class Test(Scene):
+    def construct(self):
+        E_vect = Vector(UP, color = E_COLOR)
+        wiggle = OscillatingVector(
+            E_vect, 
+            A_x = 2, 
+            A_y = 1,
+            phi_x = np.pi/2,
+            frequency = 0.5,
+            tail = UP+RIGHT,
+        )
+        randy = Randolph()
+
+        self.add(randy, wiggle)
+        self.dither(2)
+        self.play(FadeOut(E_vect))
+        self.dither(2)
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