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
{
    public partial class MainWindow : Window
    {
        ManualResetEvent MRE = new ManualResetEvent(true);

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

        Point pt = new Point();

        int numPoints = 300;

        Polyline pline = new Polyline();


        BackgroundWorker Worker = new BackgroundWorker() { WorkerReportsProgress = true };

        public MainWindow()
        {
            InitializeComponent();

            StopButton.Click += (o, e) => MRE.Reset();
            StartButton.Click += (o, e) => MRE.Set();

            Worker.DoWork += (o, e) => DrawSpiroGraph(0);
            Worker.ProgressChanged += (o, e) => Progressbar1.Value = e.ProgressPercentage;
        }

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


        static Random rand = new Random((int)DateTime.Now.Ticks);
        double aaFactor = (rand.Next(10, 96)) * (-0.01);

        void DrawSpiroGraph(int iteration) {
            Thread.Sleep(30);
            MRE.WaitOne();

            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;
            pline.Dispatcher.BeginInvoke((Action)(() => pline.Points.Add(pnt)));

            Worker.ReportProgress((int)(((float)iteration / numPoints) * 100));

            if (iteration < numPoints) DrawSpiroGraph(iteration+1);
        }


        private void button1_Click(object sender, RoutedEventArgs e)
        {
            if (Worker.IsBusy) return;

            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(); }


    }
}