Polygon2DPainter.cs

using System;
using SkiaSharp;
 
namespace Waher.Script.Graphs.Functions.Plots
{
    public class Polygon2DPainter : SingleColorGraphPainter, IPainter2D
    {
        public void DrawGraph(SKCanvas Canvas, SKPoint[] Points, object[] Parameters, SKPoint[] PrevPoints, object[] PrevParameters,
            DrawingArea DrawingArea)
        {
            SKColor Color = Graph.ToColor(Parameters[0]);
            SKPaint Brush = new SKPaint
            {
                FilterQuality = SKFilterQuality.High,
                IsAntialias = true,
                Style = SKPaintStyle.Fill,
                Color = Color
            };
 
            SKPath Path = new SKPath();
            bool First = true;
 
            foreach (SKPoint P in Points)
            {
                if (First)
                {
                    First = false;
                    Path.MoveTo(P);
                }
                else
                    Path.LineTo(P);
            }
 
            Path.Close();
 
            Canvas.DrawPath(Path, Brush);
 
            Brush.Dispose();
            Path.Dispose();
        }
    }
}