using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplicationGraphics
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {

        double x0 = 250;
        double y0 = 150;
        double r = 100;
        double a = 0;

        Point pt = new Point();

        int numPoints = 300;

        Polyline pline = new Polyline();

        Random rand = new Random((int)DateTime.Now.Ticks);

        BackgroundWorker Worker = new BackgroundWorker();
        public MainWindow()
        {
            InitializeComponent();

            Worker.DoWork += (o, e) => DrawSpiroGraph();
        }

        public void SetLineFeatures()
        {
            pline = new Polyline();
            pline.Stroke = Brushes.Blue;
        }


        public void DrawSpiroGraph()
        {
            double aaFactor = (rand.Next(10, 96)) * (-0.01);

            for (int i = 0; i <= numPoints; i++)
            {
                Thread.Sleep(25);
                pt = new Point();
                pt.X = x0 + r * Math.Cos(a);
                pt.Y = y0 + r * Math.Sin(a);

                double rr = 0.5 * r;
                double aa = aaFactor * a;
                Point pnt = new Point();
                pnt.X = pt.X + rr * Math.Cos(aa);
                pnt.Y = pt.Y + rr * Math.Sin(aa);
                a += 0.5;
                //System.Threading.Thread.Sleep(1000);
                pline.Dispatcher.BeginInvoke((Action)(() => pline.Points.Add(pnt)));
            }
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            if (canvas.Children.Contains(pline))
                canvas.Children.Remove(pline);

            SetLineFeatures();
            Worker.RunWorkerAsync();
            canvas.Children.Add(pline);
        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            this.Close();
        }


    }
}