Geometry Curved Line

The defined geometry VMobject related to curved line in geometry.py

• Class TipableVMobject(VMobject)
• Class Arc(TipableVMobject)
• Class ArcBetweenPoints(Arc)
• Class CurvedArrow(ArcBetweenPoints)
• Class CurvedDoubleArrow(CurvedArrow)
• Class CubicBezier(VMobject)

Class TipableVMobject(VMobject)

TipableVMobject is used as a dummy tipable vmobject container with base tipable vmobject manipulating functions. A TipableVMobject object focuses only on the internal structural design of a VMobject object.

Class Arc(TipableVMobject)

Arc is used to generate an arc for given radius, arc_center, start_angle, and angle.

Example

Code

# folder/file: tut/manim_mobject_arc_001a.py

from manimlib.scene.scene import Scene
from manimlib.mobject.geometry import Arc
from manimlib.animation.creation import ShowCreation

class manim_mobject_arc_001a(Scene): 
   def construct(self):
      poly = Arc(radius=1.1,arc_center=(0,0,0),start_angle=0.25,angle=1.3208,color="#33FF33",fill_color="#FFFF00",fill_opacity=1)
      self.play(ShowCreation(poly),run_time=2)
      self.play(ShowCreation(Arc(arc_center=(1,1,0),stroke_width=50,fill_color="#FFFF00",fill_opacity=1)),run_time=2)
      self.play(ShowCreation(Arc()),run_time=2)
      self.play(ShowCreation(Arc(start_angle=3.1416,angle=1.5708,stroke_width=15)),run_time=2)

Output

Class ArcBetweenPoints(Arc)

ArcBetweenPoints is used to generate an arc for given start point, end point and angle between points.

Example

Code

# folder/file: tut/manim_mobject_arcbetweenpoints_001a.py
import numpy as np
from manimlib.scene.scene import Scene
from manimlib.mobject.geometry import ArcBetweenPoints
from manimlib.animation.creation import ShowCreation

class manim_mobject_arcbetweenpoints_001a(Scene): 
   def construct(self):
      poly = ArcBetweenPoints(np.array([1,0,0]),np.array([1,2,0]),color="#33FF33",fill_color="#FFFF00",fill_opacity=1)
      self.play(ShowCreation(poly),run_time=2)
      self.play(ShowCreation(ArcBetweenPoints(end=np.array([1,0,0]),start=np.array([1,2,0]),angle=0.7854,stroke_width=15)),run_time=2)
      self.play(ShowCreation(ArcBetweenPoints(np.array([-4,0,0]),np.array([-1,3,0]))),run_time=2)
      self.play(ShowCreation(ArcBetweenPoints(np.array([4,0,0]),np.array([1,3,0]),angle=3.7854,stroke_width=15)),run_time=2)

Output

Class CurvedArrow(ArcBetweenPoints)

CurvedArrow is used to generate a curved arrow for given start_point, end_point, angle, and tip_length.

Example

Code

# folder/file: tut/manim_mobject_curvedarrow_001a.py
import numpy as np
from manimlib.scene.scene import Scene
from manimlib.mobject.geometry import CurvedArrow
from manimlib.animation.creation import ShowCreation

class manim_mobject_curvedarrow_001a(Scene): 
   def construct(self):
      poly = CurvedArrow(np.array([1,0,0]),np.array([1,2,0]),color="#33FF33",fill_color="#FFFF00",fill_opacity=1)
      self.play(ShowCreation(poly),run_time=2)
      self.play(ShowCreation(CurvedArrow(end_point=np.array([1,0,0]),start_point=np.array([1,2,0]),angle=0.7854,stroke_width=15)),run_time=2)
      self.play(ShowCreation(CurvedArrow(np.array([-4,0,0]),np.array([-1,3,0]),tip_length=0.1)),run_time=2)
      self.play(ShowCreation(CurvedArrow(np.array([4,0,0]),np.array([1,3,0]),angle=3.7854,stroke_width=15)),run_time=2)

Output

Class CurvedDoubleArrow(CurvedArrow)

CurvedDoubleArrow is used to generate a curved double arrow for given start_point, end_point, angle, and tip_length.

Example

Code

# folder/file: tut/manim_mobject_curveddoublearrow_001a.py
import numpy as np
from manimlib.scene.scene import Scene
from manimlib.mobject.geometry import CurvedDoubleArrow
from manimlib.animation.creation import ShowCreation

class manim_mobject_curveddoublearrow_001a(Scene): 
   def construct(self):
      poly = CurvedDoubleArrow(np.array([1,0,0]),np.array([1,2,0]),color="#33FF33",fill_color="#FFFF00",fill_opacity=1)
      self.play(ShowCreation(poly),run_time=2)
      self.play(ShowCreation(CurvedDoubleArrow(end_point=np.array([1,0,0]),start_point=np.array([1,2,0]),angle=0.7854,stroke_width=15)),run_time=2)
      self.play(ShowCreation(CurvedDoubleArrow(np.array([-4,0,0]),np.array([-1,3,0]),tip_length=0.1)),run_time=2)
      self.play(ShowCreation(CurvedDoubleArrow(np.array([4,0,0]),np.array([1,3,0]),angle=3.7854,stroke_width=15)),run_time=2)

Output

Class CubicBezier(VMobject)

CubicBezier is used to generate a cubic bezier for given point set, [start, start control, end control, end].

Example

Code

# folder/file: tut/manim_mobject_cubicbezier_001a.py
import numpy as np
from manimlib.scene.scene import Scene
from manimlib.mobject.geometry import CubicBezier
from manimlib.animation.creation import ShowCreation

class manim_mobject_cubicbezier_001a(Scene): 
   def construct(self):
      poly = CubicBezier([(-6,0,0),(-6,1,0),(-5,1,0),(-5,0,0)],color="#33FF33",fill_color="#FFFF00",fill_opacity=1)
      self.play(ShowCreation(poly),run_time=2)
      self.play(ShowCreation(CubicBezier([(-3,-2,0),(-3,1,0),(-5,-3,0),(-5,-4,0)],stroke_width=15)),run_time=2)
      self.play(ShowCreation(CubicBezier(np.array([(-4,0,0),(-4,1,0),(4,1,0),(4,0,0)]))),run_time=2)
      self.play(ShowCreation(CubicBezier([(-6,2,0),(-6,1,0),(-5,-2,0),(-5,3,0)],stroke_width=15)),run_time=2)        

Output