转换

限定名称: manim.animation.transform.Transform

class Transform(mobject=None, *args, use_override=True, **kwargs)[来源]

基础类:Animation

一个Transform将一个Mobject转换为目标Mobject。

Parameters:
  • mobject (Mobject | None) – 要转换的Mobject。它将被改变以成为target_mobject

  • target_mobject (Mobject | None) – 转换的目标。

  • path_func (Callable | None) – 一个定义路径的函数,mobject的点沿着该路径移动,直到它们与target_mobject的点匹配,参见utils.paths

  • path_arc (float) – 如果使用圆弧路径,mobject的点将遵循的弧角(以弧度为单位)到达目标点,参见path_arc_centers。 另请参见manim.utils.paths.path_along_arc()

  • path_arc_axis (np.ndarray) – 如果使用圆形路径弧线,则沿此轴旋转,参见 path_arc_centers

  • path_arc_centers (np.ndarray) –

    沿着这些圆弧的中心,mobject的点被变换移动。

    如果设置了此参数且未设置path_func,则将使用path_arc参数生成一个path_along_circles路径,并存储在path_func中。如果设置了path_func,则此参数和其他path_arc字段将作为属性设置,但不会从中生成path_func

  • replace_mobject_with_target_in_scene (bool) –

    控制转换完成后替换哪个mobject。

    如果设置为True,mobject将从场景中移除,target_mobject将替换它。否则,target_mobject不会被添加,mobject只是取其形状。

示例

示例:TransformPathArc

from manim import *

class TransformPathArc(Scene):
    def construct(self):
        def make_arc_path(start, end, arc_angle):
            points = []
            p_fn = path_along_arc(arc_angle)
            # alpha animates between 0.0 and 1.0, where 0.0
            # is the beginning of the animation and 1.0 is the end.
            for alpha in range(0, 11):
                points.append(p_fn(start, end, alpha / 10.0))
            path = VMobject(stroke_color=YELLOW)
            path.set_points_smoothly(points)
            return path

        left = Circle(stroke_color=BLUE_E, fill_opacity=1.0, radius=0.5).move_to(LEFT * 2)
        colors = [TEAL_A, TEAL_B, TEAL_C, TEAL_D, TEAL_E, GREEN_A]
        # Positive angles move counter-clockwise, negative angles move clockwise.
        examples = [-90, 0, 30, 90, 180, 270]
        anims = []
        for idx, angle in enumerate(examples):
            left_c = left.copy().shift((3 - idx) * UP)
            left_c.fill_color = colors[idx]
            right_c = left_c.copy().shift(4 * RIGHT)
            path_arc = make_arc_path(left_c.get_center(), right_c.get_center(),
                                     arc_angle=angle * DEGREES)
            desc = Text('%d°' % examples[idx]).next_to(left_c, LEFT)
            # Make the circles in front of the text in front of the arcs.
            self.add(
                path_arc.set_z_index(1),
                desc.set_z_index(2),
                left_c.set_z_index(3),
            )
            anims.append(Transform(left_c, right_c, path_arc=angle * DEGREES))

        self.play(*anims, run_time=2)
        self.wait()
class TransformPathArc(Scene):
    def construct(self):
        def make_arc_path(start, end, arc_angle):
            points = []
            p_fn = path_along_arc(arc_angle)
            # alpha animates between 0.0 and 1.0, where 0.0
            # is the beginning of the animation and 1.0 is the end.
            for alpha in range(0, 11):
                points.append(p_fn(start, end, alpha / 10.0))
            path = VMobject(stroke_color=YELLOW)
            path.set_points_smoothly(points)
            return path

        left = Circle(stroke_color=BLUE_E, fill_opacity=1.0, radius=0.5).move_to(LEFT * 2)
        colors = [TEAL_A, TEAL_B, TEAL_C, TEAL_D, TEAL_E, GREEN_A]
        # Positive angles move counter-clockwise, negative angles move clockwise.
        examples = [-90, 0, 30, 90, 180, 270]
        anims = []
        for idx, angle in enumerate(examples):
            left_c = left.copy().shift((3 - idx) * UP)
            left_c.fill_color = colors[idx]
            right_c = left_c.copy().shift(4 * RIGHT)
            path_arc = make_arc_path(left_c.get_center(), right_c.get_center(),
                                     arc_angle=angle * DEGREES)
            desc = Text('%d°' % examples[idx]).next_to(left_c, LEFT)
            # Make the circles in front of the text in front of the arcs.
            self.add(
                path_arc.set_z_index(1),
                desc.set_z_index(2),
                left_c.set_z_index(3),
            )
            anims.append(Transform(left_c, right_c, path_arc=angle * DEGREES))

        self.play(*anims, run_time=2)
        self.wait()

方法

begin

开始动画。

clean_up_from_scene

在完成动画后清理场景

create_target

get_all_families_zipped

get_all_mobjects

获取动画中涉及的所有mobjects。

interpolate_submobject

属性

path_arc

path_func

begin()[source]

开始动画。

此方法在动画播放时被调用。尽可能多的初始化,特别是任何mobject复制,应该在此方法中进行。

Return type:

clean_up_from_scene(scene)[source]

在完成动画后清理场景

这包括如果动画是移除器,则移除动画的Mobject

Parameters:

场景 (场景) – 动画应该从中清理的场景。

Return type:

get_all_mobjects()[来源]

获取动画中涉及的所有mobjects。

排序必须与interpolate_submobject参数的顺序匹配

Returns:

mobjects的序列。

Return type:

序列[Mobject]