结合我们之前写的AnimationPlayer，现在实现一个小游戏。
定义自己的Style，前面有例子已经说明了如何在自己的Styles.axaml中写Style。
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BombDropper.axaml代码
<Window xmlns="https://github.com/avaloniaui"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"Height="500" Width="600"x:Class="AvaloniaUI.BombDropper"Title="BombDropper"><Grid x:Name="LayoutRoot" ColumnDefinitions="*,280"><!-- 左边游戏区域 --><Border BorderBrush="SteelBlue" BorderThickness="1" Margin="5"><Grid><Canvas x:Name="canvasBackground"SizeChanged="canvasBackground_SizeChanged"MinWidth="50"><Canvas.Background><RadialGradientBrush><GradientStop Color="AliceBlue" Offset="0"/><GradientStop Color="White" Offset="0.7"/></RadialGradientBrush></Canvas.Background></Canvas></Grid></Border><!-- 右边控制面板 --><Border Grid.Column="1" BorderBrush="SteelBlue" BorderThickness="1" Margin="5"><Border.Background><RadialGradientBrush GradientOrigin="100%,70%" Center="100%,70%" RadiusX="100%" RadiusY="100%"><GradientStop Color="Orange" Offset="0"/><GradientStop Color="White" Offset="1"/></RadialGradientBrush></Border.Background><StackPanel Margin="15" VerticalAlignment="Center" HorizontalAlignment="Center"><TextBlock FontFamily="Impact" FontSize="35" Foreground="LightSteelBlue">Bomb Dropper</TextBlock><TextBlock x:Name="lblRate" Margin="0,30,0,0"TextWrapping="Wrap" FontFamily="Georgia" FontSize="14"/><TextBlock x:Name="lblSpeed" Margin="0,30"TextWrapping="Wrap" FontFamily="Georgia" FontSize="14"/><TextBlock x:Name="lblStatus"TextWrapping="Wrap" FontFamily="Georgia" FontSize="20">No bombs have dropped.</TextBlock><Button x:Name="cmdStart" Padding="5" Margin="0,30" Width="90"Content="Start Game" Click="cmdStart_Click"/></StackPanel></Border></Grid> </Window>
BombDropper.axaml.cs代码
using Avalonia;
using Avalonia.Controls;
using Avalonia.Input;
using Avalonia.Interactivity;
using Avalonia.Media;
using Avalonia.Threading;
using Shares.Avalonia;
using System;
using System.Collections.Generic;namespace AvaloniaUI;public partial class BombDropper : Window
{private readonly DispatcherTimer bombTimer = new();private readonly Dictionary<Control, AnimationPlayer> players = new();private readonly Random random = new();// ---------- 游戏参数 ----------private double secondsBetweenAdjustments = 15;private double initialSecondsBetweenBombs = 1.3;private double initialSecondsToFall = 3.5;private double secondsBetweenBombs;private double secondsToFall;private double secondsBetweenBombsReduction = 0.1;private double secondsToFallReduction = 0.1;private DateTime lastAdjustmentTime = DateTime.MinValue;private int droppedCount = 0;private int savedCount = 0;private int maxDropped = 5;public BombDropper(){InitializeComponent();this.Load("avares://Shares/Avalonia/Styles/Styles.axaml");bombTimer.Tick += BombTimer_Tick;}private void canvasBackground_SizeChanged(object? sender, SizeChangedEventArgs e){// 限制绘制区域canvasBackground.Clip = new RectangleGeometry(new Rect(0, 0, canvasBackground.Bounds.Width, canvasBackground.Bounds.Height));}private void cmdStart_Click(object? sender, RoutedEventArgs e){cmdStart.IsEnabled = false;droppedCount = 0;savedCount = 0;secondsBetweenBombs = initialSecondsBetweenBombs;secondsToFall = initialSecondsToFall;lblStatus.Text = "Game started!";bombTimer.Interval = TimeSpan.FromSeconds(secondsBetweenBombs);bombTimer.Start();}private void BombTimer_Tick(object? sender, EventArgs e){// 每隔 15 秒调整掉落速度if ((DateTime.Now - lastAdjustmentTime).TotalSeconds > secondsBetweenAdjustments){lastAdjustmentTime = DateTime.Now;secondsBetweenBombs = Math.Max(0.3, secondsBetweenBombs - secondsBetweenBombsReduction);secondsToFall = Math.Max(0.5, secondsToFall - secondsToFallReduction);bombTimer.Interval = TimeSpan.FromSeconds(secondsBetweenBombs);lblRate.Text = $"A bomb is released every {secondsBetweenBombs:0.0}s";lblSpeed.Text = $"Each bomb takes {secondsToFall:0.0}s to fall.";}DropBomb();}private void DropBomb(){// 创建炸弹控件var bomb = new ContentControl { Classes = { "Bomb" } };double bombWidth = 150;double maxLeft = Math.Max(0, canvasBackground.Bounds.Width - bombWidth);double left = random.NextDouble() * maxLeft;double startTop = -bombWidth;double endTop = canvasBackground.Bounds.Height;Canvas.SetLeft(bomb, left);Canvas.SetTop(bomb, startTop);bomb.PointerPressed += Bomb_PointerPressed;canvasBackground.Children.Add(bomb);// ---------------- AnimationPlayer 控制 ----------------var player = new AnimationPlayer{Duration = secondsToFall,Fps = 60};// 下落动画player.At(0).Ease("CubicEaseIn").PlayLocal(progress =>{double y = startTop + (endTop - startTop) * progress;Canvas.SetTop(bomb, y);});// 左右摆动动画double baseLeft = left;player.At(0, secondsToFall).Ease("SineEaseInOut").PlayLocal(progress =>{double offset = Math.Sin(progress * Math.PI * 8) * 10;Canvas.SetLeft(bomb, baseLeft + offset);});player.AnimationCompleted += () => OnBombFallen(bomb);players[bomb] = player;player.Start();}private void Bomb_PointerPressed(object? sender, PointerPressedEventArgs e){if (sender is not Control bomb)return;if (!players.TryGetValue(bomb, out var player))return;player.Stop();players.Remove(bomb);savedCount++;double currentTop = Canvas.GetTop(bomb);double currentLeft = Canvas.GetLeft(bomb);double targetLeft = currentLeft < canvasBackground.Bounds.Width / 2? -100 : canvasBackground.Bounds.Width + 100;var escape = new AnimationPlayer{Duration = 1.5,Fps = 60};double startTop = currentTop;double startLeft = currentLeft;escape.At(0).Ease("CubicEaseOut").PlayDual((p, g) =>{double y = startTop - 300 * p; // 向上飞double x = startLeft + (targetLeft - startLeft) * p;Canvas.SetTop(bomb, y);Canvas.SetLeft(bomb, x);});escape.AnimationCompleted += () =>{canvasBackground.Children.Remove(bomb);UpdateStatus();};escape.Start();}private void OnBombFallen(Control bomb){if (!canvasBackground.Children.Contains(bomb))return;droppedCount++;canvasBackground.Children.Remove(bomb);UpdateStatus();if (droppedCount >= maxDropped)EndGame();}private void UpdateStatus(){lblStatus.Text = $"You have dropped {droppedCount} bombs and saved {savedCount}.";}private void EndGame(){bombTimer.Stop();lblStatus.Text += "\n\nGame over.";foreach (var kv in players)kv.Value.Stop();players.Clear();canvasBackground.Children.Clear();cmdStart.IsEnabled = true;}
}
运行效果
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