CachingTest.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="600" Width="800"x:Class="AvaloniaUI.CachingTest"x:Name="window"Title="CachingTest"><Window.Resources><ArithmeticConverter x:Key="converter" /></Window.Resources><Grid Margin="5" RowDefinitions="*,auto"><Canvas Name="canvas"><Path Name="pathBackground" Stroke="DarkRed" StrokeThickness="1" ></Path><Rectangle Name="rect" Canvas.Left="10" Canvas.Top="100" Fill="Blue" Width="75" Height="75"><Rectangle.Styles><Style Selector="Rectangle"><Style.Animations><Animation Duration="0:0:10" IterationCount="Infinite"><KeyFrame Cue="0%"><Setter Property="Canvas.Left" Value="10"/></KeyFrame><KeyFrame Cue="100%"><Setter Property="Canvas.Left"Value="{Binding #window.Width, Converter={StaticResource converter}, ConverterParameter=-100}" /></KeyFrame></Animation></Style.Animations></Style></Rectangle.Styles></Rectangle></Canvas><CheckBox Grid.Row="2" Name="chkCache" Content="Enable Caching"IsChecked="False" Click="chkCache_Click"></CheckBox></Grid> </Window>
CachingTest.axaml.cs代码
using Avalonia;
using Avalonia.Controls;
using Avalonia.Interactivity;
using Avalonia.Markup.Xaml;
using Avalonia.Media;
using Avalonia.Media.Imaging;
using System;
using System.Text;namespace AvaloniaUI;public partial class CachingTest : Window
{public CachingTest(){InitializeComponent();int maxHeight = (int)this.Height;int maxWidth = (int)this.Width;var rand = new Random();var sb = new StringBuilder();// PathGeometry 用字符串构造sb.Append("M 0,0 ");for (int i = 0; i < 500; i++){sb.Append($"L {rand.Next(0, maxWidth)},{rand.Next(0, maxHeight)} ");}var geometry = Geometry.Parse(sb.ToString());pathBackground.Data = geometry;chkCache.Click += chkCache_Click;}private void chkCache_Click(object? sender, RoutedEventArgs e){if (chkCache.IsChecked == true){var rtb = new RenderTargetBitmap(new PixelSize((int)Bounds.Width, (int)Bounds.Height));rtb.Render(pathBackground);pathBackground.Fill = new ImageBrush(rtb);}else{pathBackground.Fill = null; // 移除缓存，恢复原始绘制}}
}
运行效果
)
