Project contains code to draw attractors. These objects are made with a simple algorithm:
1) take any point p₀ = (x₀, y₀),
2) calculate the next point p_n+1 = ν(p_n) = (x_n+1, y_n+1), change the color at p_n+1,
3) and repeat step 2 many times...

Formulas to calculate successive p_n+1 points are:

x_n+1 = f(x_n, y_n) = sin(t₁ * y_n) + t₃ * cos(t₁ * x_n)
y_n+1 = g(x_n, y_n) = sin(t₂ * x_n) + t₄ * cos(t₂ * y_n)

Look at the file attractor_basics.l, you'll find the corresponding code easyli. These formulas are just to start experiments. Other combinations of trigonometric functions will work as well, just be warned: it takes some patience to find interesting t_i coefficients.

In the file app.l you will find a complete application to draw attractors. It uses a base attractor class to implement all common functions. The derived custom_attractor redefines f and g formulas. There are also some clues how to play with color modifications. Another interesting idea is to change t_i's slowly with iterations... try it.

Attractors idea for the project and some coefficient sets based on: Clifford Attractors