在 WPF 中相对于其容器绘制对角文本/文本块/标签/控件

Question

我有一个动态大小的Grid。在里面我想画一个对角线 TextBlock 。我已经有一个对角线Path，您可以在其中设置LineGeometry 进行动态调整。但我在TextBlock 中找不到吊坠。我错过了什么吗？

<Grid>
    <TextBlock Text="Draft" HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="180" FontWeight="Bold" Foreground="#FFA43A3A" RenderTransformOrigin="0.5,0.5"/>
    <Path Grid.Row="2" Grid.Column="0" Stroke="Red" StrokeThickness="2" Stretch="Fill">
        <Path.Data>
            <LineGeometry StartPoint="1,0" EndPoint="0,1" />                
        </Path.Data>            
    </Path>
</Grid>

预览

目标

这是我想要在不设置绝对 RotateTransform 的情况下拥有的东西。

两种解决方案的比较

red 前景是 FrankM 解决方案，green 来自 Henrik Hansen

https://imgur.com/a/92X0LXI

Answer 1

每当 Grid 的大小发生变化时，您都必须计算 TextBlock 的角度，例如使用转换器。

这是一个例子：

<Window x:Class="WpfApplication13.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:WpfApplication13"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <local:AngleConverter x:Key="AngleConverter"/>
    </Window.Resources>
    <Grid x:Name="grid">
        <TextBlock Text="Draft" HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="120" FontWeight="Bold" Foreground="#FFA43A3A"
                   RenderTransformOrigin="0.5,0.5">
            <TextBlock.RenderTransform>
                <MultiBinding Converter="{StaticResource AngleConverter}">
                    <MultiBinding.Bindings>
                        <Binding ElementName="grid" Path="ActualWidth"/>
                        <Binding ElementName="grid" Path="ActualHeight"/>
                    </MultiBinding.Bindings>
                </MultiBinding>
            </TextBlock.RenderTransform>
        </TextBlock>
        <Path Stroke="Red" StrokeThickness="2" Stretch="Fill">
            <Path.Data>
                <LineGeometry StartPoint="1,0" EndPoint="0,1" />
            </Path.Data>
        </Path>
    </Grid>
</Window>

转换器代码：

using System;
using System.Globalization;
using System.Windows.Data;
using System.Windows.Media;

namespace WpfApplication13
{
    public class AngleConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            double width = values[0] as double? ?? 0;
            double height = values[1] as double? ?? 0;

            double angleRadians = Math.Atan2(height, width);
            return new RotateTransform {Angle = - angleRadians * 180.0 / Math.PI};
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}

结果：

Answer 2

您也可以将 TextBlock 包装在 ViewBox 中。它也会缩放文本，但这可能是不可取的？：

<Viewbox Stretch="Fill" StretchDirection="Both">
  <TextBlock Text="Draft" FontWeight="Bold" Foreground="#FFA43A3A" Margin="5" RenderTransformOrigin="0.5,0.5" >
    <TextBlock.RenderTransform>
      <RotateTransform Angle="-35.0" />
    </TextBlock.RenderTransform>
  </TextBlock>
</Viewbox>

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