Plot2DArea.cs

using System;
using SkiaSharp;
using Waher.Script.Abstraction.Elements;
using Waher.Script.Exceptions;
using Waher.Script.Model;
 
namespace Waher.Script.Graphs.Functions.Plots
{
    public class Plot2DArea : FunctionMultiVariate
    {
        private static readonly ArgumentType[] argumentTypes3Parameters = new ArgumentType[] { ArgumentType.Vector, ArgumentType.Vector, ArgumentType.Scalar };
        private static readonly ArgumentType[] argumentTypes2Parameters = new ArgumentType[] { ArgumentType.Vector, ArgumentType.Vector };
 
        public Plot2DArea(ScriptNode X, ScriptNode Y, int Start, int Length, Expression Expression)
            : base(new ScriptNode[] { X, Y }, argumentTypes2Parameters, Start, Length, Expression)
        {
        }
 
        public Plot2DArea(ScriptNode X, ScriptNode Y, ScriptNode Color, int Start, int Length, Expression Expression)
            : base(new ScriptNode[] { X, Y, Color, }, argumentTypes3Parameters, Start, Length, Expression)
        {
        }
 
        public override string FunctionName => nameof(Plot2DArea);
 
        public override string[] Aliases
        {
            get
            {
                return new string[] { "plot2dlinearea" };
            }
        }
 
        public override string[] DefaultArgumentNames
        {
            get { return new string[] { "x", "y", "color" }; }
        }
 
        public override IElement Evaluate(IElement[] Arguments, Variables Variables)
        {
            if (!(Arguments[0] is IVector X))
                throw new ScriptRuntimeException("Expected vector for X argument.", this);
 
            if (!(Arguments[1] is IVector Y))
                throw new ScriptRuntimeException("Expected vector for Y argument.", this);
 
            int Dimension = X.Dimension;
            if (Y.Dimension != Dimension)
                throw new ScriptRuntimeException("Vector size mismatch.", this);
 
            IElement AreaColor = Arguments.Length <= 2 ? null : Arguments[2];
 
            return new Graph2D(Variables, X, Y, new Plot2DAreaPainter(), false, true, this,
                AreaColor?.AssociatedObjectValue ?? new SKColor(Graph.DefaultColor.Red, Graph.DefaultColor.Green, Graph.DefaultColor.Blue, 192));
        }
    }
}