diff options
Diffstat (limited to 'video')
| -rw-r--r-- | video/qam.py | 36 |
1 files changed, 31 insertions, 5 deletions
diff --git a/video/qam.py b/video/qam.py index 88096e9..1cb10dd 100644 --- a/video/qam.py +++ b/video/qam.py @@ -29,6 +29,9 @@ class TimeDependentComplexPlane(ComplexPlane): def number_to_point(self, number, time=0): return self.coords_to_point(number.real, number.imag, time) + def point_to_number(self, point, time=0): + return point[0] + 1j * point[1] + def n2p(self, number, time=0): return self.number_to_point(number, time) @@ -65,23 +68,46 @@ class QamModulation(Scene): CONFIG = {} def construct(self): - cplane = TimeDependentComplexPlane() + self.camera.frame.reorient(0, 0, 0) + cplane = TimeDependentComplexPlane() self.play(ShowCreation(cplane)) + + + dot = Dot(cplane.n2p(1 + 2j)) + number = DecimalNumber() + + number.add_updater(lambda m: m.next_to(dot, RIGHT)) + + def update_nums(m): + x, y, z = dot.get_center() + num = cplane.p2n((x,y)) + m.set_value(num) + + number.add_updater(update_nums) + + self.play(ShowCreation(dot), ShowCreation(number)) + self.play(dot.animate.move_to(cplane.n2p(-5 + 3j)), run_time=2) + self.play(dot.animate.move_to(cplane.n2p(-1 - 3j)), run_time=2) + self.play(dot.animate.move_to(cplane.n2p(4 - 3j))) + + self.wait(1) + + # Get out and show time dependence self.play(self.camera.frame.animate.move_to(2 * OUT)) - graph_y = cplane.get_inphase_graph(lambda t: 2 * np.cos(2 * t), color=RED) + graph_y = cplane.get_inphase_graph(lambda t: -2 * np.cos(2 * t), color=RED) graph_x = cplane.get_quadrature_graph(lambda t: 1 * sig.square(4 * t), color=BLUE) - self.play(self.camera.frame.animate.reorient(90, 90, 90)) + self.play(self.camera.frame.animate.reorient(-90, 90, 90)) self.play(ShowCreation(graph_x)) self.play(self.camera.frame.animate.reorient(0, 90, 90)) self.play(ShowCreation(graph_y)) - self.play(self.camera.frame.animate.reorient(80, 90, 90)) + self.play(self.camera.frame.animate.reorient(-100, 90, 90)) # arrow = Arrow( # open an interactive IPython shell here - self.embed() + # self.embed() |