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Math in XAML objects

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Math in XAML objects

Sonntag, 2. Februar 2025, 06:15

I'm trying to make a custom widget with the User Defined feature and I can't find any way to make a bar graph. I'm assuming I need to adjust the margins of the rectangle to change the size and shape of the "fill" of the bar graph, but I can't find a valid way to do that with XAML without trying to import external libraries.

e.g.

Quellcode

 
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<UserControl
   x:Name="this"
   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:sys="clr-namespace:System;assembly=mscorlib"
   mc:Ignorable="d"
   d:DesignHeight="200"
   d:DesignWidth="300">
   <Grid>
      <Grid.RowDefinitions>
         <RowDefinition />
      </Grid.RowDefinitions>
      <Rectangle
         Grid.Row="0"
         Opacity="1.0"
         Margin="7,7,7,7"
         RadiusX="0"
         RadiusY="0">
         <Rectangle.Style>
            <Style
               TargetType="{x:Type Rectangle}">
               <Style.Triggers>
                  <DataTrigger
                     Value="True"
                     Binding="{Binding ElementName=this, Path=DataContext.Value, ConverterParameter=0, Converter={StaticResource CompareSmallerConverter}}">
                     <Setter
                        Property="Margin"
                        Value="this.Height / 100 * DataContext.value, 0, 0, 0" />
                  </DataTrigger>
                  <DataTrigger
                     Value="False"
                     Binding="{Binding ElementName=this, Path=DataContext.Value, ConverterParameter=0, Converter={StaticResource CompareSmallerConverter}}">
                     <Setter
                        Property="Fill"
                        Value="Green" />
                  </DataTrigger>
               </Style.Triggers>
            </Style>
         </Rectangle.Style>
      </Rectangle>
   </Grid></UserControl>


Any pointers? Is there a way to see the XAML behind existing components so I could just reverse engineer how existing graphs are made?

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