creation

class janim.anims.creation.ShowPartial(item: Item, bound_func: Callable[[UpdaterParams], tuple[int, int]], *, auto_close_path: bool = False, become_at_end: bool = False, root_only: bool = False, zero_bound: int | None = None, **kwargs)

基类：DataUpdater

显示物件一部分的动画，显示的部分由 bound_func 决定

ShowPartialExample

from janim.imports import *

class ShowPartialExample(Timeline):
    def construct(self):
        group = Group(
            Line(path_arc=PI),
            Line(path_arc=PI),
            Circle(),
            Circle()
        )
        group.points.arrange(aligned_edge=DOWN)

        func1 = lambda p: (0, p.alpha)
        func2 = lambda p: (.5 - .5 * p.alpha, .5 + .5 * p.alpha)

        self.play(
            ShowPartial(group[0], func1),
            ShowPartial(group[1], func2),
            ShowPartial(group[2], func1),
            ShowPartial(group[3], func2),
            duration=3
        )

class janim.anims.creation.Create(item: Item, auto_close_path: bool = True, **kwargs)

基类：ShowPartial

显示物件的创建过程

CreateExample

from janim.imports import *

class CreateExample(Timeline):
    def construct(self):
        group = Group(
            Square(),
            Square(),
            Circle(fill_alpha=0.5),
            Text('Text', font_size=48),
            color=BLUE
        )
        group.points.arrange(buff=LARGE_BUFF)

        self.play(
            Create(group[0], auto_close_path=False),
            Create(group[1:]),
            duration=3
        )

class janim.anims.creation.Uncreate(item: Item, hide_at_end: bool = True, auto_close_path: bool = True, **kwargs)

基类：ShowPartial

显示物件的销毁过程（Create 的倒放）

UncreateExample

from janim.imports import *

class UncreateExample(Timeline):
    def construct(self):
        group = Group(
            Square(),
            Square(),
            Circle(fill_alpha=0.5),
            Text('Text', font_size=48),
            color=BLUE
        )
        group.points.arrange(buff=LARGE_BUFF)

        self.play(
            Uncreate(group[0], auto_close_path=False),
            Uncreate(group[1:]),
            duration=3
        )

class janim.anims.creation.Destruction(item: Item, hide_at_end: bool = True, auto_close_path: bool = True, **kwargs)

基类：ShowPartial

显示物件的销毁过程

• 与 Uncreate 方向相反

DestructionExample

class DestructionExample(Timeline):
    def construct(self):
        group = Group(
            Square(),
            Square(),
            Circle(fill_alpha=0.5),
            Text('Text', font_size=48),
            color=BLUE
        )
        group.points.arrange(buff=LARGE_BUFF)

        self.play(
            Destruction(group[0], auto_close_path=False),
            Destruction(group[1:]),
            duration=3
        )

class janim.anims.creation.DrawBorderThenFill(item: ~janim.items.item.Item, *, duration: float = 2.0, stroke_radius: float = 0.01, scale_with_camera: bool = False, stroke_color: JAnimColor = None, rate_func: RateFunc = <function double_smooth>, become_at_end: bool = False, root_only: bool = False, **kwargs)

基类：DataUpdater

画出边缘，然后填充颜色

• 可以使用 stroke_radius 参数调整“画出边缘”时的描边粗细，在默认画面下的值是 0.01

  如果设置了 scale_with_camera 参数，描边粗细会随着 camera 大小的变化而调整，画面尺寸越小，描边越细

DrawBorderThenFillExample

from janim.imports import *

class DrawBorderThenFillExample(Timeline):
    def construct(self):
        group = Group(
            Square(fill_alpha=0.5),
            Circle(fill_alpha=0.5),
            Text('Text', font_size=48),
            color=BLUE
        )
        group.points.arrange(buff=LARGE_BUFF)

        self.play(
            DrawBorderThenFill(group),
            duration=3
        )
        self.forward()

        self.play(
            DrawBorderThenFill(group, stroke_radius=0.02),
            duration=3
        )
        self.forward()

class janim.anims.creation.Write(item: ~janim.items.item.Item, *, duration: float | None = None, lag_ratio: float | None = None, rate_func: RateFunc = <function linear>, skip_null_items: bool = True, root_only: bool = False, **kwargs)

基类：DrawBorderThenFill

显示书写过程（对每个子物件应用 DrawBorderThenFill）

WriteExample

from janim.imports import *

class WriteExample(Timeline):
    def construct(self):
        dots = Dot(color=BLUE) * 10
        dots.points.arrange().shift(UP)

        txt = Text('Text text Text text')
        txt.points.shift(DOWN)

        self.play(
            Write(dots, duration=2),
            Write(txt, duration=2),
        )

class janim.anims.creation.ShowIncreasingSubsets(group: ~janim.items.points.Group[~janim.items.item.Item], *, int_func=<built-in function round>, show_at_begin: bool = True, hide_at_end: bool = False, **kwargs)

基类：Animation

ShowIncreasingSubsetsExample

from janim.imports import *

class ShowIncreasingSubsetsExample(Timeline):
    def construct(self):
        text = Text('ShowIncreasingSubsets')
        text.points.set_width(11)
        self.forward(0.5)
        self.play(ShowIncreasingSubsets(text[0], duration=3))
        self.forward(0.5)

class janim.anims.creation.ShowSubitemsOneByOne(group: ~janim.items.points.Group, *, int_func=<built-in function ceil>, hide_at_end: bool = True, **kwargs)

基类：ShowIncreasingSubsets

ShowSubitemsOneByOneExample

from janim.imports import *

class ShowSubitemsOneByOneExample(Timeline):
    def construct(self):
        text = Text('ShowSubitemsOneByOne')
        text.points.set_width(11)
        self.forward(0.5)
        self.play(ShowSubitemsOneByOne(text[0], duration=3))
        self.forward(0.5)