NumberLine#

Qualified name: manim.mobject.graphing.number\_line.NumberLine

class NumberLine(x_range=None, length=None, unit_size=1, include_ticks=True, tick_size=0.1, numbers_with_elongated_ticks=None, longer_tick_multiple=2, exclude_origin_tick=False, rotation=0, stroke_width=2.0, include_tip=False, tip_width=0.35, tip_height=0.35, tip_shape=None, include_numbers=False, font_size=36, label_direction=array([ 0., -1., 0.]), label_constructor=<class 'manim.mobject.text.tex_mobject.MathTex'>, scaling=<manim.mobject.graphing.scale.LinearBase object>, line_to_number_buff=0.25, decimal_number_config=None, numbers_to_exclude=None, numbers_to_include=None, **kwargs)[source]#

Bases: Line

Creates a number line with tick marks.

Parameters

x_range (Sequence[float] | None) – The [x_min, x_max, x_step] values to create the line.
length (float | None) – The length of the number line.
unit_size (float) – The distance between each tick of the line. Overwritten by length, if specified.
include_ticks (bool) – Whether to include ticks on the number line.
tick_size (float) – The length of each tick mark.
numbers_with_elongated_ticks (Iterable[float] | None) – An iterable of specific values with elongated ticks.
longer_tick_multiple (int) – Influences how many times larger elongated ticks are than regular ticks (2 = 2x).
rotation (float) – The angle (in radians) at which the line is rotated.
stroke_width (float) – The thickness of the line.
include_tip (bool) – Whether to add a tip to the end of the line.
tip_width (float) – The width of the tip.
tip_height (float) – The height of the tip.
tip_shape (type[ArrowTip] | None) – The mobject class used to construct the tip, or None (the default) for the default arrow tip. Passed classes have to inherit from ArrowTip.
include_numbers (bool) – Whether to add numbers to the tick marks. The number of decimal places is determined by the step size, this default can be overridden by decimal_number_config.
scaling (_ScaleBase) – The way the x_range is value is scaled, i.e. LogBase for a logarithmic numberline. Defaults to LinearBase.
font_size (float) – The size of the label mobjects. Defaults to 36.
label_direction (Sequence[float]) – The specific position to which label mobjects are added on the line.
label_constructor (VMobject) – Determines the mobject class that will be used to construct the labels of the number line.
line_to_number_buff (float) – The distance between the line and the label mobject.
decimal_number_config (dict | None) – Arguments that can be passed to DecimalNumber to influence number mobjects.
numbers_to_exclude (Iterable[float] | None) – An explicit iterable of numbers to not be added to the number line.
numbers_to_include (Iterable[float] | None) – An explicit iterable of numbers to add to the number line
kwargs – Additional arguments to be passed to Line.
exclude_origin_tick (bool) –

Note

Number ranges that include both negative and positive values will be generated from the 0 point, and may not include a tick at the min / max values as the tick locations are dependent on the step size.

Examples

Example: NumberLineExample ¶

from manim import *

class NumberLineExample(Scene):
    def construct(self):
        l0 = NumberLine(
            x_range=[-10, 10, 2],
            length=10,
            color=BLUE,
            include_numbers=True,
            label_direction=UP,
        )

        l1 = NumberLine(
            x_range=[-10, 10, 2],
            unit_size=0.5,
            numbers_with_elongated_ticks=[-2, 4],
            include_numbers=True,
            font_size=24,
        )
        num6 = l1.numbers[8]
        num6.set_color(RED)

        l2 = NumberLine(
            x_range=[-2.5, 2.5 + 0.5, 0.5],
            length=12,
            decimal_number_config={"num_decimal_places": 2},
            include_numbers=True,
        )

        l3 = NumberLine(
            x_range=[-5, 5 + 1, 1],
            length=6,
            include_tip=True,
            include_numbers=True,
            rotation=10 * DEGREES,
        )

        line_group = VGroup(l0, l1, l2, l3).arrange(DOWN, buff=1)
        self.add(line_group)

Methods

`add_labels`	Adds specifically positioned labels to the `NumberLine` using a `dict`.
`add_numbers`	Adds `DecimalNumber` mobjects representing their position at each tick of the number line.
`add_ticks`	Adds ticks to the number line.
`get_labels`
`get_number_mobject`	Generates a positioned `DecimalNumber` mobject generated according to `label_constructor`.
`get_number_mobjects`
`get_tick`	Generates a tick and positions it along the number line.
`get_tick_marks`
`get_tick_range`	Generates the range of values on which labels are plotted based on the `x_range` attribute of the number line.
`get_unit_size`
`get_unit_vector`
`n2p`	Abbreviation for `number_to_point()`.
`number_to_point`	Accepts a value along the number line and returns a point with respect to the scene.
`p2n`	Abbreviation for `point_to_number()`.
`point_to_number`	Accepts a point with respect to the scene and returns a float along the number line.
`rotate_about_number`
`rotate_about_zero`

Attributes

`animate`	Used to animate the application of any method of `self`.
`animation_overrides`
`color`
`depth`	The depth of the mobject.
`fill_color`	If there are multiple colors (for gradient) this returns the first one
`height`	The height of the mobject.
`n_points_per_curve`
`sheen_factor`
`stroke_color`
`width`	The width of the mobject.

add_labels(dict_values, direction=None, buff=None, font_size=None, label_constructor=None)[source]#

Adds specifically positioned labels to the NumberLine using a dict. The labels can be accessed after creation via self.labels.

Parameters

dict_values (dict[float, str | float | VMobject]) – A dictionary consisting of the position along the number line and the mobject to be added: {1: Tex("Monday"), 3: Tex("Tuesday")}. label_constructor will be used to construct the labels if the value is not a mobject (str or float).
direction (Sequence[float]) – Determines the direction at which the label is positioned next to the line.
buff (float | None) – The distance of the label from the line.
font_size (float | None) – The font size of the mobject to be positioned.
label_constructor (VMobject | None) – The VMobject class that will be used to construct the label. Defaults to the label_constructor attribute of the number line if not specified.

Raises

AttributeError – If the label does not have a font_size attribute, an AttributeError is raised.

add_numbers(x_values=None, excluding=None, font_size=None, label_constructor=None, **kwargs)[source]#

Adds DecimalNumber mobjects representing their position at each tick of the number line. The numbers can be accessed after creation via self.numbers.

Parameters

x_values (Iterable[float] | None) – An iterable of the values used to position and create the labels. Defaults to the output produced by get_tick_range()
excluding (Iterable[float] | None) – A list of values to exclude from x_values.
font_size (float | None) – The font size of the labels. Defaults to the font_size attribute of the number line.
label_constructor (VMobject | None) – The VMobject class that will be used to construct the label. Defaults to the label_constructor attribute of the number line if not specified.

add_ticks()[source]#: Adds ticks to the number line. Ticks can be accessed after creation via self.ticks.

get_number_mobject(x, direction=None, buff=None, font_size=None, label_constructor=None, **number_config)[source]#

Generates a positioned DecimalNumber mobject generated according to label_constructor.

Parameters

x (float) – The x-value at which the mobject should be positioned.
direction (Sequence[float] | None) – Determines the direction at which the label is positioned next to the line.
buff (float | None) – The distance of the label from the line.
font_size (float | None) – The font size of the label mobject.
label_constructor (VMobject | None) – The VMobject class that will be used to construct the label. Defaults to the label_constructor attribute of the number line if not specified.

Returns

The positioned mobject.

Return type

DecimalNumber

get_tick(x, size=None)[source]#

Generates a tick and positions it along the number line.

Parameters

x (float) – The position of the tick.
size (float | None) – The factor by which the tick is scaled.

Returns

A positioned tick.

Return type

Line

get_tick_range()[source]#

Generates the range of values on which labels are plotted based on the x_range attribute of the number line.

Returns: A numpy array of floats represnting values along the number line.
Return type: np.ndarray

n2p(number)[source]#

Abbreviation for number_to_point().

Parameters: number (float | np.ndarray) –
Return type: np.ndarray

number_to_point(number)[source]#

Accepts a value along the number line and returns a point with respect to the scene.

Parameters: number (float | np.ndarray) – The value to be transformed into a coordinate. Or a list of values.
Returns: A point with respect to the scene’s coordinate system. Or a list of points.
Return type: np.ndarray

Examples

>>> from manim import NumberLine
>>> number_line = NumberLine()
>>> number_line.number_to_point(0)
array([0., 0., 0.])
>>> number_line.number_to_point(1)
array([1., 0., 0.])
>>> number_line.number_to_point([1,2,3])
array([[1., 0., 0.],
       [2., 0., 0.],
       [3., 0., 0.]])

p2n(point)[source]#

Abbreviation for point_to_number().

Parameters: point (Sequence[float]) –
Return type: float

point_to_number(point)[source]#

Accepts a point with respect to the scene and returns a float along the number line.

Parameters: point (Sequence[float]) – A sequence of values consisting of (x_coord, y_coord, z_coord).
Returns: A float representing a value along the number line.
Return type: float

Examples

>>> from manim import NumberLine
>>> number_line = NumberLine()
>>> number_line.point_to_number((0,0,0))
0.0
>>> number_line.point_to_number((1,0,0))
1.0
>>> number_line.point_to_number([[0.5,0,0],[1,0,0],[1.5,0,0]])
array([0.5, 1. , 1.5])