I want to show two horizontal lines within a graphic. The Position of the Lines is depending on some data. Therefor I created a ValueConverter (basically double to int). The Problems is, the lines are always shown in the same position.
I have to following XAML:
<Window
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:CGM_Auswertung"
xmlns:chartingToolkit="clr-namespace:System.Windows.Controls.DataVisualization.Charting;assembly=System.Windows.Controls.DataVisualization.Toolkit" x:Class="CGM_Auswertung.MainWindow"
mc:Ignorable="d"
Title="MainWindow" Height="780" Width="1300" Loaded="Window_Loaded">
<Window.Resources>
<local:DoubleToPositionConverter x:Key="DtPConverter"/>
</Window.Resources>
<Grid Name="MainGrid">
<StackPanel Margin="10" Orientation="Vertical">
<Button Name="OpenFile" Content="Öffnen" Height="30" Margin="550,0" Click="OpenFile_Click"/>
<Grid x:Name="drawGrid" >
<TextBox Height="30" Width="40" HorizontalAlignment="Left" VerticalAlignment="Top" Text="{Binding OptMinimum}"/>
<Frame x:Name="drawFrame" HorizontalAlignment="Left" Height="420" Margin="40,10,10,50" VerticalAlignment="Top" Width="1210" BorderBrush="Black" BorderThickness="3">
<Frame.Content>
<Grid Name="contentGrid" Background="Transparent" >
<Line x:Name="MinLine" Stroke="Red" StrokeThickness="2" StrokeDashArray="2,2" X1="0" X2="1200" Y1="{Binding OptMinimum, Converter={StaticResource DtPConverter}}" Y2="{Binding OptMinimum, Converter={StaticResource DtPConverter}}"/>
<Line x:Name="MaxLine" Stroke="Red" StrokeThickness="2" StrokeDashArray="2,2" X1="0" X2="1200" Y1="{Binding OptMaximum, Converter={StaticResource DtPConverter}}" Y2="{Binding OptMaximum, Converter={StaticResource DtPConverter}}"/>
<Grid Name="vertLineGrid" MouseMove="tempLineGrid_MouseMove" Background="Transparent" HorizontalAlignment="Center" VerticalAlignment="Center" Height="394" Width="1183" MouseUp="ReleaseSelectedItem"/>
</Grid>
</Frame.Content>
...
this is the converter:
namespace CGM_Auswertung
{
public class ViewModelBase : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(PropertyChangedEventArgs e)
{
PropertyChanged?.Invoke(this, e);
}
}
public class ViewModel : ViewModelBase
{
...
private double _optMinimum;
public double OptMinimum
{
get { return _optMinimum; }
set
{
_optMinimum = value;
OnPropertyChanged(new PropertyChangedEventArgs("OptMinimum"));
}
}
private double _optMaximum;
public double OptMaximum
{
get { return _optMaximum; }
set
{
_optMaximum = value;
OnPropertyChanged(new PropertyChangedEventArgs("OptMaximum"));
}
}
}
public class DoubleToPositionConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
return (int)(Math.Abs(400 - (double)value * 20));
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return (double)(Math.Abs((double)value / 20 - 400 / 20));
}
}
}
I also tried this before the converter:
[ValueConversion(typeof(double),typeof(int))]
but it didn't change anything And here is the start of my program:
namespace CGM_Auswertung
{
/// <summary>
/// Interaktionslogik für MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
private List<CGM_Measurement> completeMeasures = new List<CGM_Measurement>();
private ViewModel mvm = new ViewModel() { MinimalValue = 0, MaximalValue=0, ActualValue=0};
private UIElement selectedItem = null;
public MainWindow()
{
mvm.FirstDay = mvm.LastDay = DateTime.Today;
mvm.OverviewText = "Switch to day view";
mvm.Visual = Visibility.Visible;
mvm.VisualInverse = Visibility.Collapsed;
mvm.OptMinimum = 2.0;
mvm.OptMaximum = 3.0;
InitializeComponent();
MainGrid.DataContext = mvm;
}
I guess the problem is somewhere in the xaml, because when i set a breakpoint within my converter the convert is never called.
I guess because the conversion is so simple I could use another property within my viewmodel. But since im still learning about WPF I would like to do it with a value converter.
Thanks for your help.
