ti_mo
103 lines
3.1 KiB
C#
103 lines
3.1 KiB
C#
using System;
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using System.Linq;
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using Avalonia;
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using Avalonia.Controls;
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using Avalonia.Controls.Shapes;
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using Avalonia.Input;
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using Avalonia.Interactivity;
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using Avalonia.Media;
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using Avalonia.VisualTree;
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using DelauneyTriangulation.ViewModels;
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namespace DelauneyTriangulation.Views;
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public partial class MainWindow : Window
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{
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private bool _isPanning;
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private Point _panStart;
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private Vector _panOffset = new();
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private double _scale = 1.0;
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private const double MinScale = 0.2;
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private const double MaxScale = 8.0;
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private readonly TranslateTransform _panTransform = new();
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private readonly ScaleTransform _scaleTransform = new();
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private readonly TransformGroup _transformGroup = new();
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public MainWindow()
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{
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InitializeComponent();
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_transformGroup.Children.Add(_scaleTransform);
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_transformGroup.Children.Add(_panTransform);
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SceneContent.RenderTransform = _transformGroup;
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if (DataContext is MainWindowViewModel vm) vm.View = this;
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}
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private void OnTitleBarPointerPressed(object? sender, PointerPressedEventArgs e)
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{
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if (!e.GetCurrentPoint(this).Properties.IsLeftButtonPressed) return;
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BeginMoveDrag(e);
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}
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private void OnTitleBarDoubleTapped(object? sender, RoutedEventArgs e) => WindowState = WindowState == WindowState.Maximized ? WindowState.Normal : WindowState.Maximized;
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private void Scene_OnPointerPressed(object? sender, PointerPressedEventArgs e)
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{
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if (!e.GetCurrentPoint(Scene).Properties.IsLeftButtonPressed)
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return;
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_isPanning = true;
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_panStart = e.GetPosition(this);
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Scene.Cursor = new Cursor(StandardCursorType.SizeAll);
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e.Handled = true;
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}
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private void Scene_OnPointerMoved(object? sender, PointerEventArgs e)
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{
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if (!_isPanning) return;
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var pos = e.GetPosition(this);
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var delta = pos - _panStart;
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var current = _panOffset + delta;
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_panTransform.X = current.X;
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_panTransform.Y = current.Y;
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e.Handled = true;
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}
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private void Scene_OnPointerReleased(object? sender, PointerReleasedEventArgs e)
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{
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if (!_isPanning) return;
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var pos = e.GetPosition(this);
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var delta = pos - _panStart;
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_panOffset += delta;
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_isPanning = false;
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Scene.Cursor = new Cursor(StandardCursorType.Arrow);
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e.Handled = true;
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}
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private void Scene_OnWheel(object? sender, PointerWheelEventArgs e)
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{
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var mouse = e.GetPosition(Scene);
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var oldScale = _scale;
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var factor = Math.Pow(1.1, e.Delta.Y);
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var newScale = Math.Clamp(oldScale * factor, MinScale, MaxScale);
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var applied = newScale / oldScale;
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_scale = newScale;
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_scaleTransform.ScaleX = _scaleTransform.ScaleY = _scale;
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_panOffset = new Vector(
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mouse.X - applied * (mouse.X - _panOffset.X),
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mouse.Y - applied * (mouse.Y - _panOffset.Y)
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);
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_panTransform.X = _panOffset.X;
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_panTransform.Y = _panOffset.Y;
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e.Handled = true;
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}
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} |