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https://github.com/fossunited/joy

Joy is a tiny creative coding library in Python.
https://github.com/fossunited/joy

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Joy is a tiny creative coding library in Python.

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README 

        
# Joy



Joy is a tiny creative coding library in Python.



## Installation



The easiest way to install it is download `joy.py` and place it in your

directory. The library has no dependencies.



It can be downloaded from:



## Coordinate System



Joy uses a canvas with `(0, 0)` as the center of the canvas.



By default, the size of the canvas is `(300, 300)`.



## Using Joy



The `Joy` library integrates well with Jupyter environment and it is

recommended to explore Joy in a Jupyter lab.



The first thing you need to do is import the module.



```python

from joy import *

```



Once the functionality in the module is imported, you can start playing

with it.



## Basic Shapes



Joy supports the basic shapes `circle`, `ellipse`, `rectangle` and `line`.



Let's start with a drawing a circle:



```

c = circle()

show(c)

```



![svg](images/circle.svg)



By default circle will have center at `(0, 0)` and radius as `100`. But

you can specify different values.



```

c = circle(x=50, y=50, r=50)

show(c)

```



![svg](images/circle-2.svg)



The other basic types that are supported are `ellipse`, `rectangle`,

and `line`:



```

s1 = circle()

s2 = ellipse()

s3 = rectangle()

s4 = line()

show(s1, s2, s3, s4)

```



![svg](images/basic-shapes.svg)



## Combining Shapes



Joy supports `+` operator to join shapes.



```

def donut(x, y, r):

    c1 = circle(x=x, y=y, r=r)

    c2 = circle(x=x, y=y, r=r/2)

    return c1+c2



d = donut(0, 0, 100)

show(d)

```



![svg](images/donut.svg)



## Transformations



Joy supports `translate`, `rotate` and `scale` transformations.

Transformations are applied using `|` operator.



```

shape = circle(r=50) | translate(x=100, y=0)

show(shape)

```



![svg](images/circle-translate.svg)



Transformations can be chained too.



```

r1 = rectangle(w=200, h=200)

r2 = r1 | rotate(angle=45) | scale(1/SQRT2)

show(r1, r2)

```

![svg](images/rect-rotate.svg)



## Higer-Order Transformations



Joy supports higher-order transformation `repeat`.



The `repeat` transformation applies a transformation multiple times and

combines all the resulting shapes.



For example, draw 10 circles:



```

c = circle(x=-100, y=0, r=50)

shape = c | Repeat(10, Translate(x=10, y=0)

show(shape)

```



![svg](images/ten-circles.svg)



Combined with rotation, it can create amusing patterns.



```

shape = line() | repeat(18, rotate(angle=10))

show(shape)

```



![svg](images/cycle-line.svg)



We could do the same with a square:



```

shape = rectangle(w=200, h=200) | repeat(18, rotate(angle=10))

show(shape)

```



![svg](images/cycle-square.svg)



or a rectangle:



```

shape = rectangle(w=200, h=100) | repeat(18, rotate(angle=10))

show(shape)

```



![svg](images/cycle-rect.svg)



We can combine multiple transformations and repeat.



```

shape = rectangle(w=300, h=300) | repeat(72, rotate(360/72) | scale(0.92))

show(shape)

```



![svg](images/square-spiral.svg)



You can try the same with a circle too:



```

c = circle(x=100, y=0, radius=50)

shape = c | repeat(36*4, rotate(10) | scale(0.97))

show(shape)

```

![svg](images/circle-spiral.svg)



For more information, please checkout the [tutorial](tutorial.ipynb).



## Tutorial



See [tutorial.ipynb](tutorial.ipynb).



## Acknowledgements



Special thanks to Amit Kapoor (@amitkaps). This library woundn't have

been possible without his inputs.



The long discussions between @anandology and @amitkaps on functional

programming and computational artistry (for almost over an year) and the

[initial experiments](https://amitkaps.com/artistry) were some of the

seeds that gave life to this library.



## License



This repository has been released under the MIT License.