from manimlib import *

class HelloWorldExample(InteractiveScene):
    def construct(self):
        # Setup
        plane = NumberPlane(
            x_range=(-4, 4), y_range=(0, 1.5, 0.5),
            width=14, height=5,
            background_line_style=dict(
                stroke_color=GREY_B,
                stroke_width=2,
                stroke_opacity=0.75
            )
        )
        plane.to_edge(DOWN)
        plane.x_axis.add_numbers(num_decimal_places=1, excluding=[0])
        plane.y_axis.add_numbers(font_size=24)
        self.add(plane)

        # graph
        graph = plane.get_graph(lambda x: np.exp(-x**2))
        graph.set_stroke(BLUE, 2)
        self.add(graph)

        area = plane.get_area_under_graph(graph, x_range=[-1, 1])
        area.scale(0.7)
        area.next_to(graph.pfp(0.65), UR)
        self.add(area)