Element Management

The Element management functions of Scene object is to manage the Mobject objects of Scene object. The Element management functions are

• def add(self, *mobjects)
• def remove(self, *mobjects)
• def add_mobjects_among(self, values)
• def add_foreground_mobjects(self, *mobjects)
• def add_foreground_mobject(self, mobject)
• def remove_foreground_mobjects(self, *to_remove)
• def remove_foreground_mobject(self, mobject)
• def clear(self)

def add_mobjects_among(self, values)

Add one, more, or all Mobject object instances in the local symbol table at this code point of available to the casting list of Scene object. Any Mobject object instance declared after this calling point is not included. The order of background and foreground arrangement depends on the order of symbolic varibale in the local symbol table. The add_mobjects_among function can be used to add all mobjects using locals().values(), to add one or more mobjects using functions like filter(lambda x: x!=temp,locals().values()), or mapping like map(locals().get,{"temp"}) etc.last updated 28Dec2019

Example Scene.add_mobjects_among

Example of Scene.add_mobjects_among

Code Scene.add_mobjects_among

# folder/file: tut/manim_scene_add_among_001a.py

from manimlib.scene.scene import Scene
from manimlib.mobject.geometry import Circle
from manimlib.mobject.geometry import Square

class manim_scene_add_among_001a(Scene): 
    def construct(self):
        temp1=Square(color="#FFFF00")
        temp2=Circle(radius=1.2,color="#FF0000",stroke_width=10)
        temp3=Circle()
        self.add_mobjects_among(map(locals().get,{"temp1","temp2"}))
        temp1=Circle(stroke_width=10,radius=2.5)
        temp2=Square(color="#FFFFFF",side_length=4)
        temp3=Circle(radius=2.2,color="#FF0000",stroke_width=10)
        self.add_mobjects_among(filter(lambda x: x!=temp1,locals().values()))
        temp1=Square(color="#FFFF00")
        temp2=Circle(radius=1.2,color="#FF0000",stroke_width=10)
        temp3=Circle()
        temp4=Circle(color="#FFFF00",radius=1.75)
        temp5=Square(color="#FFFF00",side_length=2.25)
        temp6=Square(side_length=5.25)
        self.add_mobjects_among(locals().values())
        temp7=Square(side_length=7)
        print(locals().values())

Output Scene.add_mobjects_among

def add_foreground_mobjects(self, *mobjects)

Add one or more Mobject objects to both the priority casting list and casting list of Scene object. The priority casting list is used as an flag indicator to indicate that all Mobject in the priority casting list at this code point and after should be promoted to the front of the casting list of Scene object. And similar to add function, Mobjects are added to Scene object from background to foreground in the order with which these Mobject objects are added.last updated 28Dec2019

Example Scene.add_foreground_mobjects

Example of Scene.add_foreground_mobjects

Code Scene.add_foreground_mobjects

# folder/file: tut/manim_scene_add_foreground_mobjects_001a.py

from manimlib.scene.scene import Scene
from manimlib.mobject.geometry import Circle
from manimlib.mobject.geometry import Square

class manim_scene_add_foreground_mobjects_001a(Scene):
    def construct(self):
        temp=Square()
        temp1=Circle(stroke_width=10)
        temp2=Square(color="#FFFF00",stroke_width=10,side_length=1.8)
        temp3=Square(fill_opacity=1)
        self.add(temp)
        self.add_foreground_mobjects(temp1,temp2)
        self.add(temp3)

Output Scene.add_foreground_mobjects

def add_foreground_mobject(self, mobject)

Same function as add_foreground_mobjects, but add only one Mobject object to the priority casting list of Scene object instead of to the casting list.last updated 28Dec2019

Example Scene.add_foreground_mobject

Example of Scene.add_foreground_mobject.

Code Scene.add_foreground_mobject

# folder/file: tut/manim_scene_add_foreground_mobject_001a.py

from manimlib.scene.scene import Scene
from manimlib.mobject.geometry import Circle
from manimlib.mobject.geometry import Square

class manim_scene_add_foreground_mobject_001a(Scene):
    def construct(self):
        temp=Square()
        temp1=Circle(stroke_width=10)
        temp2=Square(color="#FFFF00",stroke_width=10,side_length=1.8)
        temp3=Square(fill_opacity=1)
        self.add(temp)
        self.add_foreground_mobject(temp1)
        self.add_foreground_mobject(temp2)
        self.add(temp3)

Output Scene.add_foreground_mobject