> ## Documentation Index
> Fetch the complete documentation index at: https://manimvtk.mathify.dev/llms.txt
> Use this file to discover all available pages before exploring further.
# Basic 2D Examples
> Simple 2D shape and animation examples
## Introduction
Start with these basic 2D examples to learn ManimVTK fundamentals. These examples use the default Cairo renderer and are perfect for beginners.
## Simple Shapes
### Circle Example
```python theme={null}
from manimvtk import *
class CircleExample(Scene):
def construct(self):
circle = Circle(radius=2, color=BLUE, fill_opacity=0.5)
self.play(Create(circle))
self.wait()
```
**Render:**
```bash theme={null}
manimvtk -pql examples.py CircleExample
```
### Multiple Shapes
```python theme={null}
from manimvtk import *
class MultipleShapes(Scene):
def construct(self):
# Create shapes
circle = Circle(radius=1, color=BLUE)
square = Square(side_length=1.5, color=RED)
triangle = Triangle(color=GREEN)
# Arrange horizontally
shapes = VGroup(circle, square, triangle)
shapes.arrange(RIGHT, buff=1)
# Animate
self.play(Create(shapes))
self.wait()
```
### Colored Shapes
```python theme={null}
from manimvtk import *
class ColoredShapes(Scene):
def construct(self):
# Create a grid of colored circles
colors = [RED, ORANGE, YELLOW, GREEN, BLUE, PURPLE]
circles = VGroup(*[
Circle(radius=0.5, color=color, fill_opacity=0.7)
for color in colors
])
circles.arrange_in_grid(rows=2, cols=3, buff=0.5)
# Animate creation with lag
self.play(LaggedStart(*[Create(c) for c in circles], lag_ratio=0.2))
self.wait()
```
## Transformations
### Square to Circle
```python theme={null}
from manimvtk import *
class SquareToCircle(Scene):
def construct(self):
square = Square(color=BLUE, fill_opacity=0.5)
circle = Circle(color=RED, fill_opacity=0.5)
self.play(Create(square))
self.wait()
self.play(Transform(square, circle))
self.wait()
```
### Movement and Rotation
```python theme={null}
from manimvtk import *
class MovementExample(Scene):
def construct(self):
square = Square(color=BLUE)
# Create
self.play(Create(square))
# Move right
self.play(square.animate.shift(RIGHT * 3))
# Rotate
self.play(square.animate.rotate(PI / 4))
# Scale
self.play(square.animate.scale(1.5))
self.wait()
```
## Text and Labels
### Simple Text
```python theme={null}
from manimvtk import *
class TextExample(Scene):
def construct(self):
text = Text("Hello, ManimVTK!", font_size=48, color=BLUE)
self.play(Write(text))
self.wait()
```
### Mathematical Equations
```python theme={null}
from manimvtk import *
class EquationExample(Scene):
def construct(self):
# Pythagorean theorem
equation = MathTex(r"a^2 + b^2 = c^2")
# Write equation
self.play(Write(equation))
self.wait()
# Transform to specific example
example = MathTex(r"3^2 + 4^2 = 5^2")
self.play(Transform(equation, example))
self.wait()
```
### Labeled Shapes
```python theme={null}
from manimvtk import *
class LabeledShapes(Scene):
def construct(self):
circle = Circle(radius=1.5, color=BLUE)
label = Text("Circle", font_size=36).next_to(circle, UP)
group = VGroup(circle, label)
self.play(Create(circle))
self.play(Write(label))
self.wait()
```
## Animation Techniques
### Fade In and Out
```python theme={null}
from manimvtk import *
class FadeExample(Scene):
def construct(self):
shapes = VGroup(*[
Square(side_length=1).shift(direction * 2)
for direction in [LEFT, ORIGIN, RIGHT]
])
# Fade in
self.play(FadeIn(shapes))
self.wait()
# Fade out one by one
for shape in shapes:
self.play(FadeOut(shape))
self.wait()
```
### Indicate and Flash
```python theme={null}
from manimvtk import *
class IndicateExample(Scene):
def construct(self):
squares = VGroup(*[Square() for _ in range(3)])
squares.arrange(RIGHT, buff=1)
self.add(squares)
self.wait()
# Indicate middle square
self.play(Indicate(squares[1]))
self.wait()
# Flash effect
self.play(Flash(squares[0].get_center()))
self.wait()
```
### Growing Animations
```python theme={null}
from manimvtk import *
class GrowExample(Scene):
def construct(self):
shapes = VGroup(
Circle(color=BLUE),
Square(color=RED).shift(RIGHT * 2.5),
Triangle(color=GREEN).shift(LEFT * 2.5)
)
# Grow from center
self.play(*[GrowFromCenter(shape) for shape in shapes])
self.wait()
# Shrink to center
self.play(*[ShrinkToCenter(shape) for shape in shapes])
```
## Groups and Arrangements
### Arranging in Grid
```python theme={null}
from manimvtk import *
class GridArrangement(Scene):
def construct(self):
# Create 12 squares
squares = VGroup(*[Square(side_length=0.5) for _ in range(12)])
# Arrange in 3x4 grid
squares.arrange_in_grid(rows=3, cols=4, buff=0.3)
# Color by row
for i, row in enumerate([squares[0:4], squares[4:8], squares[8:12]]):
row.set_color([RED, GREEN, BLUE][i])
self.play(Create(squares))
self.wait()
```
### Circular Arrangement
```python theme={null}
from manimvtk import *
class CircularArrangement(Scene):
def construct(self):
dots = VGroup(*[Dot() for _ in range(8)])
dots.arrange_in_circle(radius=2)
self.play(LaggedStart(*[GrowFromCenter(dot) for dot in dots], lag_ratio=0.1))
self.wait()
```
## VTK Export Examples
### Export 2D Shapes
```python theme={null}
from manimvtk import *
class Export2DShapes(Scene):
def construct(self):
shapes = VGroup(
Circle(radius=1, color=BLUE, fill_opacity=0.5),
Square(side_length=1.5, color=RED, fill_opacity=0.5),
Triangle(color=GREEN, fill_opacity=0.5)
).arrange(RIGHT, buff=1)
self.play(Create(shapes))
self.wait()
```
**Render with VTK export:**
```bash theme={null}
manimvtk -pql examples.py Export2DShapes --vtk-export
```
This creates both a video and VTK files for further visualization.
## Next Steps
Explore 3D visualization examples
Advanced animation techniques
Learn more about mobjects
Master animation techniques