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。
<!-- Bomb 样式 -->
<Style Selector="ContentControl.Bomb">
<Setter Property="Width" Value="200"/>
<Setter Property="Height" Value="200"/>
<Setter Property="RenderTransform">
<Setter.Value>
<TransformGroup>
<RotateTransform Angle="20" CenterX="50" CenterY="50"/>
<ScaleTransform ScaleX="0.5" ScaleY="0.5"/>
</TransformGroup>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Canvas>
<!-- Bomb 的视觉定义 -->
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<!-- 炸弹主体 -->
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</Canvas>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>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