如何在C#wpf Kinect SDK 2.0的滚动查看器中获取缩放值？

Question

我最近开始使用Kinect SDK 2.0,并专注于缩放和平移功能,如Control Basics-WPF示例中所示.

我已经启动并运行了缩放和平移功能.问题是我希望访问由Pinch缩放手势执行的缩放量的值.

这是我的xaml:

<UserControl x:Class="ImageNav.NavigationImage"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:k="http://schemas.microsoft.com/kinect/2014"
      mc:Ignorable="d" 
      d:DesignWidth="1200"
      d:DesignHeight="700"
      >

    <Grid Grid.RowSpan="2">
        <ScrollViewer Name="scrollViewer" Grid.Row="0" 
                      HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto"
                      k:KinectRegion.IsHorizontalRailEnabled="true" k:KinectRegion.IsVerticalRailEnabled="true"
                      k:KinectRegion.ZoomMode="Enabled">
            <Image Name="navigationImage" RenderTransformOrigin="0.5, 0.5" />
        </ScrollViewer>
        <TextBox x:Name="ZoomTextBox" Grid.Row="1" TextWrapping="Wrap" Text="Zoom: 100%" IsEnabled="False" Panel.ZIndex="10" BorderThickness="0" HorizontalAlignment="Right" VerticalAlignment="Bottom" FontSize="20"/>
    </Grid>
</UserControl>

我本来希望有类似的东西k:KinectRegion.ZoomFactor,但那是不可用的.我也想看看在UI元素,当我执行缩放手势,通过写什么样的变化Height和ActualHeight的性质ScrollViewer scrollViewer和Image navigationImage日志文件,但它们没有显示出任何的变化.

当我执行缩放手势时,我想获得缩放的值,即图像的当前高度和宽度相对于原始高度和宽度.

Answer 1

这与Kinect SDK无关,这更像是一个ScrollViewer缩放问题.没有,k:KinectRegion.ZoomFactor因为缩放不会改变图像的实际大小,它只会执行一些布局转换,因此您可以从LayoutTransform您的属性中获取缩放因子Image.

类似下面的代码应该得到缩放因子:

UserControl.Code:

    public NavigationImage()
    {
        InitializeComponent();
        DataContext = this;
        _zoom = 1.0;
    }

    double _zoom;
    public string ZoomPercentage
    {
        get
        {
            return _zoom * 100 + "%";
        }
    }

    private void scrollViewer_MouseWheel(object sender, MouseWheelEventArgs e)
    {
        if (e.Delta > 0)
        {
            _zoom += 0.1;
        }
        else
        {
            _zoom -= 0.1;
        }

        ScaleTransform scale = new ScaleTransform(_zoom, _zoom);
        navigationImage.LayoutTransform = scale;
        OnPropertyChanged("ZoomPercentage");
        e.Handled = true;
    }

UserControl.Xaml:

<UserControl x:Class="ImageNav.NavigationImage"  ...    >

    <Grid Grid.RowSpan="2">
        <ScrollViewer Name="scrollViewer" Grid.Row="0" PreviewMouseWheel="scrollViewer_MouseWheel"
        ....
                      HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto"
                      k:KinectRegion.IsHorizontalRailEnabled="true" k:KinectRegion.IsVerticalRailEnabled="true"
                      k:KinectRegion.ZoomMode="Enabled"
                      >
            <Image Name="navigationImage" RenderTransformOrigin="0.5, 0.5"/>
        </ScrollViewer>
        <TextBox x:Name="ZoomTextBox" Grid.Row="1" Text="{Binding ZoomPercentage, Mode=OneWay}" .... />
    </Grid>
</UserControl>