VGroup

限定名称: manim.mobject.types.vectorized\_mobject.VGroup

class VGroup(*vmobjects, **kwargs)

基础类: VMobject

一组向量化的mobjects。

这可以用于将多个VMobject实例组合在一起，以便一起缩放、移动等。

注释

当多次添加相同的mobject时，重复项将被忽略。 使用Mobject.copy()创建一个单独的副本，然后可以将其添加到组中。

示例

要添加VGroup，你可以使用 add()方法，或者使用+和+=运算符。同样地，你可以通过remove()方法，或者 -和-=运算符来减去VGroup中的元素：

>>> from manim import Triangle, Square, VGroup
>>> vg = VGroup()
>>> triangle, square = Triangle(), Square()
>>> vg.add(triangle)
VGroup(Triangle)
>>> vg + square   # a new VGroup is constructed
VGroup(Triangle, Square)
>>> vg            # not modified
VGroup(Triangle)
>>> vg += square; vg  # modifies vg
VGroup(Triangle, Square)
>>> vg.remove(triangle)
VGroup(Square)
>>> vg - square; # a new VGroup is constructed
VGroup()
>>> vg   # not modified
VGroup(Square)
>>> vg -= square; vg # modifies vg
VGroup()

示例：ArcShapeIris

from manim import *

class ArcShapeIris(Scene):
    def construct(self):
        colors = [DARK_BROWN, BLUE_E, BLUE_D, BLUE_A, TEAL_B, GREEN_B, YELLOW_E]
        radius = [1 + rad * 0.1 for rad in range(len(colors))]

        circles_group = VGroup()

        # zip(radius, color) makes the iterator [(radius[i], color[i]) for i in range(radius)]
        circles_group.add(*[Circle(radius=rad, stroke_width=10, color=col)
                            for rad, col in zip(radius, colors)])
        self.add(circles_group)

class ArcShapeIris(Scene):
    def construct(self):
        colors = [DARK_BROWN, BLUE_E, BLUE_D, BLUE_A, TEAL_B, GREEN_B, YELLOW_E]
        radius = [1 + rad * 0.1 for rad in range(len(colors))]

        circles_group = VGroup()

        # zip(radius, color) makes the iterator [(radius[i], color[i]) for i in range(radius)]
        circles_group.add(*[Circle(radius=rad, stroke_width=10, color=col)
                            for rad, col in zip(radius, colors)])
        self.add(circles_group)

方法

add	检查所有传递的元素是否是VMobject的实例，然后将它们添加到子对象中

属性

animate	用于动画化self的任何方法的应用。
animation_overrides
color
depth	mobject的深度。
fill_color	如果有多种颜色（用于渐变），则返回第一个颜色
height	mobject的高度。
n_points_per_curve
sheen_factor
stroke_color
width	mobject的宽度。

_original__init__(*vmobjects, **kwargs)

初始化自身。有关准确的签名，请参阅 help(type(self))。

add(*vmobjects)

检查所有传递的元素是否是VMobject的实例，然后将它们添加到子对象中

Parameters:

vmobjects (VMobject) – 要添加的VMobject列表

Return type:

VGroup

Raises:

TypeError – 如果列表中的一个元素不是 VMobject 的实例

示例

示例：AddToVGroup

from manim import *

class AddToVGroup(Scene):
    def construct(self):
        circle_red = Circle(color=RED)
        circle_green = Circle(color=GREEN)
        circle_blue = Circle(color=BLUE)
        circle_red.shift(LEFT)
        circle_blue.shift(RIGHT)
        gr = VGroup(circle_red, circle_green)
        gr2 = VGroup(circle_blue) # Constructor uses add directly
        self.add(gr,gr2)
        self.wait()
        gr += gr2 # Add group to another
        self.play(
            gr.animate.shift(DOWN),
        )
        gr -= gr2 # Remove group
        self.play( # Animate groups separately
            gr.animate.shift(LEFT),
            gr2.animate.shift(UP),
        )
        self.play( #Animate groups without modification
            (gr+gr2).animate.shift(RIGHT)
        )
        self.play( # Animate group without component
            (gr-circle_red).animate.shift(RIGHT)
        )

class AddToVGroup(Scene):
    def construct(self):
        circle_red = Circle(color=RED)
        circle_green = Circle(color=GREEN)
        circle_blue = Circle(color=BLUE)
        circle_red.shift(LEFT)
        circle_blue.shift(RIGHT)
        gr = VGroup(circle_red, circle_green)
        gr2 = VGroup(circle_blue) # Constructor uses add directly
        self.add(gr,gr2)
        self.wait()
        gr += gr2 # Add group to another
        self.play(
            gr.animate.shift(DOWN),
        )
        gr -= gr2 # Remove group
        self.play( # Animate groups separately
            gr.animate.shift(LEFT),
            gr2.animate.shift(UP),
        )
        self.play( #Animate groups without modification
            (gr+gr2).animate.shift(RIGHT)
        )
        self.play( # Animate group without component
            (gr-circle_red).animate.shift(RIGHT)
        )