WPF Canvas OnRender DrawingContext DrawImage RectAnimation

FredGrit發表於2024-11-29
CanvasGCContext
//usercontrol.cs
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApp50
{
    /// <summary>
    /// Interaction logic for UCCanvas.xaml
    /// </summary>
    public partial class UCCanvas : UserControl
    {
        public UCCanvas()
        {
            InitializeComponent();
        }
        protected override void OnRender(DrawingContext drawingContext)
        {
            string imgUrl = @"../../Resources/Images/1.jpg";
            if (!File.Exists(imgUrl))
            {
                return;
            }

            base.OnRender(drawingContext);
            RectAnimation animation = new RectAnimation();
            animation.RepeatBehavior = RepeatBehavior.Forever;
            animation.AutoReverse = true;
            animation.From = new Rect(0, 0, 100, 200);
            animation.To = new Rect(1500, 700, 100, 200);
            animation.Duration = TimeSpan.FromSeconds(5);
            var rectAnimationClock = animation.CreateClock();
            var imgSource = GetImageSourceViaUrl(imgUrl);
            drawingContext.DrawImage(imgSource, new Rect(0, 0, 100, 200), rectAnimationClock);

        }

        private ImageSource GetImageSourceViaUrl(string imgUrl)
        {
            BitmapImage bmi = new BitmapImage();
            bmi.BeginInit();
            bmi.UriSource = new Uri(imgUrl, UriKind.RelativeOrAbsolute);
            bmi.EndInit();
            if (bmi.CanFreeze)
            {
                bmi.Freeze();
            }
            return bmi;
        }
    }
}

//mainxaml
<Window x:Class="WpfApp50.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        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"
        xmlns:local="clr-namespace:WpfApp50"
        WindowState="Maximized"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <local:UCCanvas/>
    </Grid>
</Window>

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