MatrixTransform内部的MatrixTransform行为不是我所期望的
我目前有一个绑定到MatrixTransform的Border。滚动鼠标滚轮时，它基本上会缩放MatrixTransform。在边框内部，我有一个水平和垂直居中的矩形。在缩放Border变换时，我将Rectangle的变换设置为等于Border的Inverse。 ides是保持矩形相同的大小和中心。我当前的解决方案将使矩形保持相同的大小，但随着您保持缩放，它会逐渐远离中心。似乎Rectangle变换不知道Border变换，这有意义吗？
这是一些图像，第一个是初始，第二个是缩放几次（注意矩形保持相同的大小，但它不再居中）。
我试图解决的基本想法就像谷歌地图应用程序，当你放大时，城市名称大小保持不变。
这是我的所有代码，如果您愿意，您应该能够将其拉入并运行它：
MainPage.xaml中
<UserControl x:Class="InvertedZoomTest.MainPage"
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:InvertedZoomTest"
mc:Ignorable="d">
<UserControl.DataContext>
<local:MainPage_ViewModel/>
</UserControl.DataContext>
<Border BorderBrush="Pink" Background="Gray" VerticalAlignment="Center" HorizontalAlignment="Center" BorderThickness="2" MouseWheel="Border_MouseWheel" Height="100" Width="100" RenderTransform="{Binding MainTransform}">
<Rectangle x:Name="rectangle" Canvas.Top="43" Canvas.Left="43" Fill="Red" Height="10" Width="10" HorizontalAlignment="Center" VerticalAlignment="Center" RenderTransform="{Binding TextTransform}"/>
</Border>
public partial class MainPage : UserControl
{
public MainPage()
{
InitializeComponent();
}
private MainPage_ViewModel viewModel
{
get
{
return this.DataContext as MainPage_ViewModel;
}
}
private void Border_MouseWheel(object sender, MouseWheelEventArgs e)
{
if (e.Delta > 0)
{
this.viewModel.ZoomRatio += .1;
}
else
{
this.viewModel.ZoomRatio -= .1;
}
this.viewModel.UpdateTextScale();
}
}
public class MainPage_ViewModel : INotifyPropertyChanged
{
public MatrixTransform TextTransform
{
get { return _textTransform; }
set
{
if (value != _textTransform)
{
_textTransform = value;
OnPropertyChanged("TextTransform");
}
}
}
private MatrixTransform _textTransform = new MatrixTransform();
public MatrixTransform MainTransform
{
get
{
return _mainTransform;
}
set
{
if (value != _mainTransform)
{
_mainTransform = value;
OnPropertyChanged("MainTransform");
}
}
}
private MatrixTransform _mainTransform = new MatrixTransform();
public void UpdateTextScale()
{
var scaleX = (double)(ZoomRatio);
var scaleY = (double)(ZoomRatio);
Matrix updatedMainTransformMatrix = new Matrix(scaleX, 0, 0, scaleY, 0, 0);
this.MainTransform.Matrix = updatedMainTransformMatrix;
OnPropertyChanged("MainTransform");
this.TextTransform = MainTransform.Inverse as MatrixTransform;
OnPropertyChanged("TextTransform");
}
public double ZoomRatio
{
get
{
return zoomRatio;
}
set
{
zoomRatio = value;
OnPropertyChanged("ZoomRatio");
UpdateTextScale();
}
}
private double zoomRatio = 1;
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
<Border BorderBrush="Pink" Background="Gray" VerticalAlignment="Center" HorizontalAlignment="Center" BorderThickness="2" MouseWheel="Border_MouseWheel" Height="100" Width="100" RenderTransform="{Binding MainTransform}">
<Border BorderBrush="Green" BorderThickness="1" Height="{Binding ElementName=rectangle, Path=Height}" Width="{Binding ElementName=rectangle, Path=Width}">
<Rectangle x:Name="rectangle" Canvas.Top="43" Canvas.Left="43" Fill="Red" Height="10" Width="10" HorizontalAlignment="Center" VerticalAlignment="Center" RenderTransform="{Binding TextTransform}"/>
</Border>
</Border>
没有找到相关结果
已邀请:
1 个回复
长拳
<Border BorderBrush="Pink" Background="Gray" VerticalAlignment="Center" HorizontalAlignment="Center" BorderThickness="2" MouseWheel="Border_MouseWheel" Height="100" Width="100" RenderTransform="{Binding MainTransform}"> <Border BorderBrush="Green" BorderThickness="1" Height="{Binding ElementName=rectangle, Path=Height}" Width="{Binding ElementName=rectangle, Path=Width}"> <Rectangle x:Name="rectangle" Canvas.Top="43" Canvas.Left="43" Fill="Red" Height="10" Width="10" HorizontalAlignment="Center" VerticalAlignment="Center" RenderTransform="{Binding TextTransform}" RenderTransformOrigin=".5,.5"/> </Border>