Maslov/Models/ShapeManager.cs

using Avalonia;
using Avalonia.Controls;
using Avalonia.Controls.Shapes;
using Avalonia.Input;
using Avalonia.Media;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace belonging.Models
{
    public class ShapeManager
    {
        private readonly Canvas _canvas;
        private readonly List<Shape> _shapes = new List<Shape>();
        private Shape? _draggedShape;
        private Point _dragStart;
        private TextBlock? _messageTextBlock; // Ссылка на текущее сообщение

        // Статический объект Random для генерации случайных чисел
        private static readonly Random _random = new Random();

        public ShapeManager(Canvas canvas)
        {
            _canvas = canvas;
        }

        public void AddShape(Shape shape)
        {
            _shapes.Add(shape);
            _canvas.Children.Add(shape);
        }

        public void ClearShapes()
        {
            _shapes.Clear();
            _canvas.Children.Clear();
        }

        public void OnPointerPressed(object? sender, PointerPressedEventArgs e)
        {
            var point = e.GetPosition(_canvas);
            _draggedShape = null;

            foreach (var shape in _shapes)
            {
                if (shape.Bounds.Contains(point))
                {
                    _draggedShape = shape;
                    _dragStart = point;
                    break;
                }
            }

            if (_draggedShape == null)
            {
                ShowMessage("Не попал");
            }
            else
            {
                // Определяем тип фигуры и показываем соответствующее сообщение
                string shapeName = _draggedShape is Rectangle ? "квадрат" :
                                   _draggedShape is Polygon polygon ? (polygon.Points.Count == 5 ? "пятиугольник" : "шестиугольник") :
                                   "фигуру";

                ShowMessage($"Ты попал в {shapeName}!!!");
            }
        }

        public void OnPointerMoved(object? sender, PointerEventArgs e)
        {
            if (_draggedShape != null)
            {
                var currentPoint = e.GetPosition(_canvas);
                var delta = currentPoint - _dragStart;

                var newLeft = Canvas.GetLeft(_draggedShape) + delta.X;
                var newTop = Canvas.GetTop(_draggedShape) + delta.Y;

                // Проверка границ 
                if (newLeft < 0) newLeft = 0;
                if (newTop < 0) newTop = 0;
                if (newLeft + _draggedShape.Bounds.Width > _canvas.Bounds.Width) newLeft = _canvas.Bounds.Width - _draggedShape.Bounds.Width;
                if (newTop + _draggedShape.Bounds.Height > _canvas.Bounds.Height) newTop = _canvas.Bounds.Height - _draggedShape.Bounds.Height;

                Canvas.SetLeft(_draggedShape, newLeft);
                Canvas.SetTop(_draggedShape, newTop);

                _dragStart = currentPoint;
            }
        }

        public void OnPointerReleased(object? sender, PointerReleasedEventArgs e)
        {
            _draggedShape = null;
        }

        private async void ShowMessage(string message)
        {
            // Удаляем старое сообщение, если оно есть
            if (_messageTextBlock != null)
            {
                _canvas.Children.Remove(_messageTextBlock);
                _messageTextBlock = null;
            }

            // Создаем новое сообщение
            _messageTextBlock = new TextBlock
            {
                Text = message,
                FontSize = 40,
                Foreground = Brushes.Black,
                HorizontalAlignment = Avalonia.Layout.HorizontalAlignment.Center,
                VerticalAlignment = Avalonia.Layout.VerticalAlignment.Top,
                TextAlignment = Avalonia.Media.TextAlignment.Center,
                Margin = new Thickness(0, 30, 0, 0) // Отступ сверху
            };

            // Фиксированная позиция по центру сверху
            Canvas.SetLeft(_messageTextBlock, (_canvas.Bounds.Width - _messageTextBlock.Bounds.Width) / 2);
            Canvas.SetTop(_messageTextBlock, 0);

            _canvas.Children.Add(_messageTextBlock);

            // Удаляем сообщение через 2 секунды
            await Task.Delay(3000);
            if (_messageTextBlock != null)
            {
                _canvas.Children.Remove(_messageTextBlock);
                _messageTextBlock = null;
            }
        }

        public Point GenerateRandomPosition(Shape shape)
        {
            double x = _random.NextDouble() * (_canvas.Bounds.Width - shape.Bounds.Width);
            double y = _random.NextDouble() * (_canvas.Bounds.Height - shape.Bounds.Height);
            return new Point(x, y);
        }
    }
}