using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Shapes;

namespace LineDrawingApp
{
    public partial class MainWindow : Window
    {
        private Line currentLine;
        private Point startPoint;
        private bool isDrawing = false;

        public MainWindow()
        {
            InitializeComponent();
        }

        private void btnDrawLine_Click(object sender, RoutedEventArgs e)
        {
            if (currentLine == null)
            {
                currentLine = new Line
                {
                    Stroke = Brushes.Black,
                    StrokeThickness = 2
                };
                canvas.Children.Add(currentLine);
            }
        }

        private void canvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (currentLine != null)
            {
                startPoint = e.GetPosition(canvas);
                currentLine.X1 = startPoint.X;
                currentLine.Y1 = startPoint.Y;
                currentLine.X2 = startPoint.X;
                currentLine.Y2 = startPoint.Y;
                isDrawing = true;
            }
        }

        private void canvas_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            if (currentLine != null && isDrawing)
            {
                Point endPoint = e.GetPosition(canvas);
                currentLine.X2 = endPoint.X;
                currentLine.Y2 = endPoint.Y;
                currentLine = null;
                isDrawing = false;
            }
        }

        private void canvas_MouseMove(object sender, MouseEventArgs e)
        {
            if (currentLine != null && isDrawing)
            {
                Point currentPoint = e.GetPosition(canvas);
                currentLine.X2 = currentPoint.X;
                currentLine.Y2 = currentPoint.Y;
            }
        }
    }
}