"Mandelbrot Set" - Processing

ID	Autor	Duplicat din	Ultima modificare
`#4727`	Arseniu Victor Stefan (Vicarsen)	-	Vineri, 31 dec 2021, 13:14
let width = 400;
let height = 400;
let centerX = -0.5;
let centerY = 0.0;
let zoom = 1.0;
let max_iter = 50.0;
let threshold = 256.0;

class Complex {
  constructor(real, imaginary) {
    this.re = real;
    this.im = imaginary;
  }
  
  get length() {
  	return Math.sqrt(this.re * this.re + this.im * this.im);
  }
  
  add(other) {
  	return new Complex(this.re + other.re,
                       this.im + other.im);
  }
  
  multiply(other) {
  	return new Complex(this.re * other.re - this.im * other.im,
                       this.re * other.im + this.im * other.re);
  }
  
  dot(other) {
  	return this.re * other.re + this.im * other.im;
  }
}

function getColor(value) {
	if(value * 3.0 < 1.0)
    {
        let blue = color(0, 0, 255);
        let green = color(0, 255, 0);
        return lerpColor(blue, green, value * 3.0);
    }
    else if(value * 3.0 < 2.0)
    {
        let green = color(0, 255, 0);
        let red = color(255, 0, 0);
        return lerpColor(green, red, value * 3.0 - 1.0);
    }
    else
    {
        let red = color(255, 0, 0);
        let black = color(0, 0, 0);
        return lerpColor(red, black, value * 3.0 - 2.0);
    }
}

function setup() {
  createCanvas(width, height);
  for(let x = 0; x < width; x++) {
    for(let y = 0; y < height; y++) {
      let xmapped = map(x, 0, width, -1.0, 1.0);
      let ymapped = map(y, 0, height, -1.0, 1.0);
      let c = new Complex(xmapped / zoom + centerX,
                          ymapped / zoom + centerY);
      let z = new Complex(0.0, 0.0);
      let iter = 0;
      while(iter < max_iter && c.length < threshold) {
        z = z.multiply(z).add(c);
        iter++;
      }
      let n = Math.log2(Math.log2(dot(z, z))) + 4.0;
      let cl = getColor(n / max_iter);
      set(x, y, cl);
    }
  }
  updatePixels();
}

function draw() {
}