Curve-Tortoise

Draw Bezier Curves with Python turtle and interpolate points with curves! This isn't a python package! It's just me having some fun, that's all.

Usage

Calculating Bezier Interpolation

Usually people think of Bezier curves as points that you can drag around and in doing so manipulate a curve.

That's true, however you also have to have lines that connect the points, otherwise the curve won't know how to flow!

So the easiest method to describe a curve is by defining some points using variables and then connecting them together!

from common.types import *

A = Point(0.1, 0.1)
B = Point(0.3, 0.5)
C = Point(0.5, 0.1)

Line(A, B)

Although defining some lines isn't all enough either, you still need to describe how the lines connect! So instead of having some fancy type for this, just define a list, and the order that you put the lines is the order that they will be connected in!

bezier_curve = [
    Line(A, B),
    Line(B, C)
]

Then, to calculate the interpolated points along the curve you defined. Note that the amount of steps defines how many points of interpolation the curve will have (more points = smoother curve).

import bezier

bezier.bezier_interpolation(bezier_curve, steps=20)

Closed curves work as well!

bezier.bezier_interpolation(bezier_curve, steps=20, closed=True)

or

renderer.draw(tortoise, scale=400, bezier_points=[
    Line(A, B),
    Line(B, C)
], closed=True)

Drawing points

This calculates the curve and draws it with turtle, you have to pass a turtle object to the draw function and give it a scale (you can give it steps too)

import renderer
from common.types import *

tortoise = turtle.Turtle()

A = Point(0.1, 0.1)
B = Point(0.3, 0.5)
C = Point(0.5, 0.1)

renderer.draw(tortoise, 400, [
    Line(A, B),
    Line(B, C)
])

For a full working demo, check out demos.py!