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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:

https://github.com/fossunited/joy/raw/main/joy.py

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.

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

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

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

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

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

Transformations can be chained too.

r1 = rectangle(w=200, h=200)
r2 = r1 | rotate(angle=45) | scale(1/SQRT2)
show(r1, r2)

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

Combined with rotation, it can create amusing patterns.

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

svg

We could do the same with a square:

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

svg

or a rectangle:

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

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

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

For more information, please checkout the tutorial.

Tutorial

See 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 were some of the seeds that gave life to this library.

License

This repository has been released under the MIT License.

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Joy is a tiny creative coding library in Python.

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