WPF - 放大滚动查看器内的图像，并相应调整滚动条

使用WPF技术可以轻松地创建一个图像查看器，并在其中实现放大和滚动功能，同时还能自动调整滚动条的位置。本文将详细介绍如何在WPF应用程序中实现这一功能，并提供相应的案例代码。

xml
    

csharp
BitmapImage bitmap = new BitmapImage();
bitmap.BeginInit();
bitmap.UriSource = new Uri("image.jpg", UriKind.Relative);
bitmap.EndInit();
image.Source = bitmap;

xml

csharp
private void zoomSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs e)
{
    double zoomValue = zoomSlider.Value;
    ScaleTransform scaleTransform = new ScaleTransform(zoomValue, zoomValue);
    image.RenderTransform = scaleTransform;
}

csharp
private void zoomSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs e)
{
    double zoomValue = zoomSlider.Value;
    ScaleTransform scaleTransform = new ScaleTransform(zoomValue, zoomValue);
    image.RenderTransform = scaleTransform;
    // 调整ScrollViewer的滚动位置
    double scrollX = imageScrollViewer.HorizontalOffset * zoomValue / e.OldValue;
    double scrollY = imageScrollViewer.VerticalOffset * zoomValue / e.OldValue;
    imageScrollViewer.ScrollToHorizontalOffset(scrollX);
    imageScrollViewer.ScrollToVerticalOffset(scrollY);
}

xml
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Image Zoom ScrollViewer" Height="450" Width="800">
    
        
            
        
                        ValueChanged="zoomSlider_ValueChanged" />
    

csharp
using System;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;
namespace ImageZoomScrollViewer
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            BitmapImage bitmap = new BitmapImage();
            bitmap.BeginInit();
            bitmap.UriSource = new Uri("image.jpg", UriKind.Relative);
            bitmap.EndInit();
            image.Source = bitmap;
        }
        private void zoomSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs e)
        {
            double zoomValue = zoomSlider.Value;
            ScaleTransform scaleTransform = new ScaleTransform(zoomValue, zoomValue);
            image.RenderTransform = scaleTransform;
            double scrollX = imageScrollViewer.HorizontalOffset * zoomValue / e.OldValue;
            double scrollY = imageScrollViewer.VerticalOffset * zoomValue / e.OldValue;
            imageScrollViewer.ScrollToHorizontalOffset(scrollX);
            imageScrollViewer.ScrollToVerticalOffset(scrollY);
        }
    }
}