JuliaRoot2Variation.cs

using System;
using System.Numerics;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Model;
 
namespace Waher.Script.Fractals.IFS.Variations.Fractals
{
    public class JuliaRoot2Variation : FlameVariationOneComplexParameter
    {
        public JuliaRoot2Variation(ScriptNode Parameter1, ScriptNode Parameter2, int Start, int Length, Expression Expression)
            : base(Parameter1, Parameter2, Start, Length, Expression)
        {
        }
 
        public JuliaRoot2Variation(ScriptNode Parameter1, int Start, int Length, Expression Expression)
            : base(Parameter1, null, Start, Length, Expression)
        {
        }
 
        private JuliaRoot2Variation(Complex z, ScriptNode Parameter, int Start, int Length, Expression Expression)
            : base(z, Parameter, Start, Length, Expression)
        {
        }
 
        private JuliaRoot2Variation(double Re, double Im, ScriptNode Parameter1, ScriptNode Parameter2,
            int Start, int Length, Expression Expression)
            : base(Re, Im, Parameter1, Parameter2, Start, Length, Expression)
        {
        }
 
        public override IElement Evaluate(IElement[] Arguments, Variables Variables)
        {
            if (Arguments[1] is null || Arguments[1].AssociatedObjectValue is null)
            {
                return new JuliaRoot2Variation(Expression.ToComplex(Arguments[0].AssociatedObjectValue),
                    this.Arguments[0], this.Start, this.Length, this.Expression);
            }
            else
            {
                return new JuliaRoot2Variation(
                    Expression.ToDouble(Arguments[0].AssociatedObjectValue),
                    Expression.ToDouble(Arguments[1].AssociatedObjectValue),
                    this.Arguments[0], this.Arguments[1], this.Start, this.Length, this.Expression);
            }
        }
 
        public override void Operate(ref double x, ref double y)
        {
            // -sqrt(x+iy-z)
 
            double re = x - this.re;
            double im = y - this.im;
 
            double argz = Math.Atan2(im, re);
            double amp = -Math.Pow(re * re + im * im, 0.25);
            double phi = 0.5 * argz;
 
            x = amp * Math.Cos(phi);
            y = amp * Math.Sin(phi);
        }
 
        public override string FunctionName => nameof(JuliaRoot2Variation);
    }
}