diff options
| -rw-r--r-- | FSF-2020/calculus-of-several-variables/integrals-of-multivariable-functions/line-integrals/unfinished_vector_line_integral.py | 39 |
1 files changed, 17 insertions, 22 deletions
diff --git a/FSF-2020/calculus-of-several-variables/integrals-of-multivariable-functions/line-integrals/unfinished_vector_line_integral.py b/FSF-2020/calculus-of-several-variables/integrals-of-multivariable-functions/line-integrals/unfinished_vector_line_integral.py index 9cdb976..410ea98 100644 --- a/FSF-2020/calculus-of-several-variables/integrals-of-multivariable-functions/line-integrals/unfinished_vector_line_integral.py +++ b/FSF-2020/calculus-of-several-variables/integrals-of-multivariable-functions/line-integrals/unfinished_vector_line_integral.py @@ -146,34 +146,29 @@ class LineIntegrationProcess(SpecialThreeDScene): def get_vector_and_tangent(self): - dot=self.dots[self.index] - self.show_specific_vectors(dot) - self.play(Write(self.func_val)) - self.wait(1) - self.show_tangent(dot) - self.play(FadeIn(VGroup(*[ - dot.set_color(ORANGE).scale(1.4) - for dot in self.dots ] - ))) + t_tracker = ValueTracker(0) + self.t_tracker = t_tracker + t = t_tracker.get_value + coord = [np.cos(t()), np.sin(t())] + self.show_vectors(coord) + self.show_tangent(coord) - def show_specific_vectors(self,dots): - for dot in dots: - vector=self.vector_field.get_vector(dot.get_center()) - vector.set_color(ORANGE) - - self.play(Write(vector),run_time=.2) - + def show_vector(self,coord): + vector = self.vector_field.get_vector(coord) + vector.set_color(ORANGE) + + self.add(vector) + # self.play(Write(vector),run_time=.2) - def show_tangent(self,dot): + def show_tangent(self,coord): tangent_sym=TextMobject("$\\vec T(x_i,y_i)$",color="#DC75CD").scale(.8) - x=dot.get_center() - angle=self.angle_of_tangent( - self.point_to_coords(x)[0], - self.curve, + angle=self.angle_of_tangent( + coord[0], + self.line_of_int, dx=0.01 ) - vect = Vector().rotate(angle,about_point=x) + vect = Vector().rotate(angle,about_point=coord) vect.set_color("#DC75CD") tangent=vect.next_to(x,DR,buff=0) tangent_sym.next_to(tangent,DOWN,buff=.1) |