Added export option for printers, but it needs some tuning.

.idea/.idea.NetworkDiagram/.idea/avalonia.xml

@@ -3,7 +3,10 @@
   <component name="AvaloniaProject">
     <option name="projectPerEditor">
       <map>
+        <entry key="NetworkDiagram/EditDeviceWindow.axaml" value="NetworkDiagram/NetworkDiagram.csproj" />
         <entry key="NetworkDiagram/ExportOptionsWindow.axaml" value="NetworkDiagram/NetworkDiagram.csproj" />
+        <entry key="NetworkDiagram/Localization/Strings.cs.axaml" value="NetworkDiagram/NetworkDiagram.csproj" />
+        <entry key="NetworkDiagram/Localization/Strings.en.axaml" value="NetworkDiagram/NetworkDiagram.csproj" />
         <entry key="NetworkDiagram/MainWindow.axaml" value="NetworkDiagram/NetworkDiagram.csproj" />
         <entry key="NetworkDiagramAvalonia/App.axaml" value="NetworkDiagramAvalonia/NetworkDiagramAvalonia.csproj" />
         <entry key="NetworkDiagramAvalonia/Views/MainWindow.axaml" value="NetworkDiagramAvalonia/NetworkDiagramAvalonia.csproj" />

.idea/.idea.NetworkDiagram/.idea/riderPublish.xml

@@ -4,6 +4,8 @@
     <option name="locations">
       <list>
         <option value="$PROJECT_DIR$/NetworkDiagram/bin/Release/net10.0-windows/win-x64/publish" />
+        <option value="$PROJECT_DIR$/NetworkDiagram/bin/Release/net10.0/linux-x64/publish" />
+        <option value="$PROJECT_DIR$/NetworkDiagram/bin/Release/net10.0/linux-arm64/publish" />
       </list>
     </option>
   </component>

NetworkDiagram/EditDeviceWindow.axaml

@@ -5,16 +5,20 @@
         WindowStartupLocation="CenterOwner" CanResize="False"
         Background="{DynamicResource BgWhite}"
         Icon="/Assets/router.jpg">
-    <Grid Margin="25" RowDefinitions="Auto,Auto,Auto,*,Auto">
+    <Grid Margin="25" RowDefinitions="Auto,Auto,Auto,Auto,Auto,*,Auto">
 
         <TextBlock Text="{DynamicResource DeviceNameLabel}" Margin="0,0,0,8" FontWeight="SemiBold" Foreground="{DynamicResource PrimaryBlue}"/>
-        <TextBox x:Name="NameBox" Grid.Row="1" Margin="0,0,0,20"/>
+        <TextBox x:Name="NameBox" Grid.Row="1" Margin="0,0,0,15"/>
 
-        <TextBlock Grid.Row="2" Text="{DynamicResource IpLabel}" Margin="0,0,0,8" FontWeight="SemiBold" Foreground="{DynamicResource PrimaryBlue}"/>
-        <TextBox x:Name="IpBox" Grid.Row="3" Margin="0,0,0,25" 
-                 AcceptsReturn="True" VerticalContentAlignment="Top" MinHeight="80"/>
+        <TextBlock Grid.Row="2" Text="{DynamicResource DescLabel}" Margin="0,0,0,8" FontWeight="SemiBold" Foreground="{DynamicResource PrimaryBlue}"/>
+        <TextBox x:Name="DescBox" Grid.Row="3" Margin="0,0,0,15"
+                 AcceptsReturn="True" VerticalContentAlignment="Top" MinHeight="60"/>
 
-        <StackPanel Grid.Row="4" Orientation="Horizontal" HorizontalAlignment="Right">
+        <TextBlock Grid.Row="4" Text="{DynamicResource IpLabel}" Margin="0,0,0,8" FontWeight="SemiBold" Foreground="{DynamicResource PrimaryBlue}"/>
+        <TextBox x:Name="IpBox" Grid.Row="5" Margin="0,0,0,25" 
+                 AcceptsReturn="True" VerticalContentAlignment="Top" MinHeight="60"/>
+
+        <StackPanel Grid.Row="6" Orientation="Horizontal" HorizontalAlignment="Right">
             <Button Content="{DynamicResource CancelBtn}" Classes="SecondaryButtonStyle" Click="Cancel_Click" Width="90" Margin="0,0,12,0"/>
             <Button Content="{DynamicResource SaveDialogBtn}" Classes="ModernButtonStyle" Click="Save_Click" Width="90"/>
         </StackPanel>

NetworkDiagram/EditDeviceWindow.axaml.cs

@@ -19,12 +19,14 @@ namespace NetworkDiagram
             InitializeComponent();
             _device = device;
             NameBox.Text = device.Name;
+            DescBox.Text = device.Description;
             IpBox.Text = string.Join(Environment.NewLine, device.IpAddresses);
         }
 
         private void Save_Click(object? sender, RoutedEventArgs e)
         {
             _device.Name = NameBox.Text ?? string.Empty;
+            _device.Description = DescBox.Text ?? string.Empty;
             _device.IpAddresses = (IpBox.Text ?? string.Empty)
                 .Split(new[] { Environment.NewLine, "\n", "\r" }, StringSplitOptions.RemoveEmptyEntries)
                 .ToList();

NetworkDiagram/ExportOptionsWindow.axaml

@@ -4,11 +4,10 @@
         Title="{DynamicResource ExportOptionsTitle}" Width="400" Height="180"
         WindowStartupLocation="CenterOwner" CanResize="False"
         Background="{DynamicResource BgWhite}">
-    <StackPanel Margin="20" Spacing="20">
-        <TextBlock Text="{DynamicResource ExportWhiteBgMsg}" TextWrapping="Wrap" HorizontalAlignment="Center" TextAlignment="Center"/>
-        <StackPanel Orientation="Horizontal" HorizontalAlignment="Center" Spacing="20">
-            <Button Content="Yes (White)" Click="White_Click" Width="100" Classes="ModernButtonStyle"/>
-            <Button Content="No (Transparent)" Click="Transparent_Click" Width="140" Classes="SecondaryButtonStyle"/>
-        </StackPanel>
+    <StackPanel Margin="20" Spacing="10">
+        <TextBlock Text="{DynamicResource ExportWhiteBgMsg}" TextWrapping="Wrap" HorizontalAlignment="Center" TextAlignment="Center" Margin="0,0,0,10"/>
+        <Button Content="{DynamicResource ExportWhiteBtn}" Click="White_Click" HorizontalAlignment="Stretch" Classes="ModernButtonStyle"/>
+        <Button Content="{DynamicResource ExportTransparentBtn}" Click="Transparent_Click" HorizontalAlignment="Stretch" Classes="SecondaryButtonStyle"/>
+        <Button Content="{DynamicResource ExportBWBtn}" Click="BlackAndWhite_Click" HorizontalAlignment="Stretch" Classes="SecondaryButtonStyle"/>
     </StackPanel>
 </Window>

NetworkDiagram/ExportOptionsWindow.axaml.cs

@@ -3,6 +3,14 @@ using Avalonia.Interactivity;
 
 namespace NetworkDiagram
 {
+    public enum ExportOption
+    {
+        Cancel,
+        Transparent,
+        White,
+        BlackAndWhite
+    }
+
     public partial class ExportOptionsWindow : Window
     {
         public ExportOptionsWindow()
@@ -12,12 +20,17 @@ namespace NetworkDiagram
 
         private void White_Click(object? sender, RoutedEventArgs e)
         {
-            Close(true);
+            Close(ExportOption.White);
         }
 
         private void Transparent_Click(object? sender, RoutedEventArgs e)
         {
-            Close(false);
+            Close(ExportOption.Transparent);
+        }
+
+        private void BlackAndWhite_Click(object? sender, RoutedEventArgs e)
+        {
+            Close(ExportOption.BlackAndWhite);
         }
     }
 }

NetworkDiagram/Localization/Strings.cs.axaml

@@ -11,14 +11,18 @@
     <x:String x:Key="DevicesHeader">Zařízení</x:String>
     
     <!-- Edit Dialog -->
-    <x:String x:Key="EditTitle">Upravit zařízení</x:String>
+    <x:String x:Key="EditTitle">Upravit Zařízení</x:String>
     <x:String x:Key="DeviceNameLabel">Název zařízení:</x:String>
-    <x:String x:Key="IpLabel">IP adresy (jedna na řádek):</x:String>
+    <x:String x:Key="DescLabel">Popis:</x:String>
+    <x:String x:Key="IpLabel">IP Adresy (jedna na řádek):</x:String>
     <x:String x:Key="CancelBtn">Zrušit</x:String>
     <x:String x:Key="SaveDialogBtn">Uložit</x:String>
     
     <!-- Messages -->
-    <x:String x:Key="ExportWhiteBgMsg">Chcete bílé pozadí? (Ne = průhlednost)</x:String>
+    <x:String x:Key="ExportWhiteBgMsg">Vyberte styl pozadí a barev:</x:String>
+    <x:String x:Key="ExportWhiteBtn">Bílé pozadí</x:String>
+    <x:String x:Key="ExportTransparentBtn">Průhledné pozadí</x:String>
+    <x:String x:Key="ExportBWBtn">Pro tisk (šedotisk)</x:String>
     <x:String x:Key="ExportOptionsTitle">Možnosti exportu</x:String>
     <x:String x:Key="ExportSuccess">Export byl úspěšný!</x:String>
     <x:String x:Key="EmptyDiagramMsg">Diagram je prázdný.</x:String>

NetworkDiagram/Localization/Strings.en.axaml

@@ -13,12 +13,16 @@
     <!-- Edit Dialog -->
     <x:String x:Key="EditTitle">Edit Device</x:String>
     <x:String x:Key="DeviceNameLabel">Device Name:</x:String>
+    <x:String x:Key="DescLabel">Description:</x:String>
     <x:String x:Key="IpLabel">IP Addresses (one per line):</x:String>
     <x:String x:Key="CancelBtn">Cancel</x:String>
     <x:String x:Key="SaveDialogBtn">Save</x:String>
     
     <!-- Messages -->
-    <x:String x:Key="ExportWhiteBgMsg">Do you want a white background? (No will result in transparency)</x:String>
+    <x:String x:Key="ExportWhiteBgMsg">Select export background and color style:</x:String>
+    <x:String x:Key="ExportWhiteBtn">White Background</x:String>
+    <x:String x:Key="ExportTransparentBtn">Transparent Background</x:String>
+    <x:String x:Key="ExportBWBtn">Printer Friendly (Grayscale)</x:String>
     <x:String x:Key="ExportOptionsTitle">Export Options</x:String>
     <x:String x:Key="ExportSuccess">Export successful!</x:String>
     <x:String x:Key="EmptyDiagramMsg">Diagram is empty.</x:String>

NetworkDiagram/MainWindow.axaml.cs

@@ -18,6 +18,7 @@ using Avalonia.Media.Imaging;
 using Avalonia.Platform.Storage;
 using Avalonia.Threading;
 using Avalonia.VisualTree;
+using System.Runtime.InteropServices;
 using NetworkDiagram.Models;
 using Avalonia.Controls.Templates;
 
@@ -342,6 +343,13 @@ namespace NetworkDiagram
             nameText.Bind(TextBlock.TextProperty, new Avalonia.Data.Binding("Name"));
             stack.Children.Add(nameText);
 
+            var textDark = Application.Current!.FindResource("TextDark");
+            var descText = new TextBlock { FontSize = 11, FontStyle = FontStyle.Italic, HorizontalAlignment = Avalonia.Layout.HorizontalAlignment.Center, TextWrapping = TextWrapping.Wrap, TextAlignment = TextAlignment.Center, Opacity = 0.8 };
+            if (textDark is IBrush td) descText.Foreground = td;
+            descText.Bind(TextBlock.TextProperty, new Avalonia.Data.Binding("Description"));
+            descText.Bind(TextBlock.IsVisibleProperty, new Avalonia.Data.Binding("Description") { Converter = Avalonia.Data.Converters.StringConverters.IsNotNullOrEmpty });
+            stack.Children.Add(descText);
+
             var ips = new ItemsControl();
             ips.Bind(ItemsControl.ItemsSourceProperty, new Avalonia.Data.Binding("IpAddresses"));
 
@@ -732,8 +740,8 @@ namespace NetworkDiagram
             if (_currentDiagram.Devices.Count == 0) return;
 
             var prompt = new ExportOptionsWindow();
-            var result = await prompt.ShowDialog<bool?>(this);
-            if (result == null) return;
+            var result = await prompt.ShowDialog<ExportOption>(this);
+            if (result == ExportOption.Cancel) return;
 
             var topLevel = GetTopLevel(this);
             if (topLevel == null) return;
@@ -759,7 +767,7 @@ namespace NetworkDiagram
                 var tempCanvas = new Canvas {
                     Width = width,
                     Height = height,
-                    Background = result.Value ? Brushes.White : Brushes.Transparent
+                    Background = (result == ExportOption.White || result == ExportOption.BlackAndWhite) ? Brushes.White : Brushes.Transparent
                 };
 
                 // Create a container to host temp canvas for rendering
@@ -768,13 +776,28 @@ namespace NetworkDiagram
 
                 var rtb = new RenderTargetBitmap(new PixelSize(width, height), new Vector(96, 96));
 
+                // Fetch resources once for efficiency and consistency
+                var primaryBlue = Application.Current!.FindResource("PrimaryBlue") as IBrush;
+                var accentBlue = Application.Current!.FindResource("AccentBlue") as IBrush;
+                var textDark = Application.Current!.FindResource("TextDark") as IBrush ?? Brushes.Black;
+                var gridBlue = Application.Current!.FindResource("GridBlue") as IBrush;
+
+                bool isGrayscale = result == ExportOption.BlackAndWhite;
+                if (isGrayscale)
+                {
+                    primaryBlue = Brushes.Black;
+                    accentBlue = Brushes.Black;
+                    textDark = Brushes.Black;
+                    gridBlue = Brushes.Black;
+                }
+
                 // 1. Draw connections
                 foreach (var conn in _currentDiagram.Connections)
                 {
                     if (_connectionLines.TryGetValue(conn, out var line))
                     {
                         var tempLine = new Line {
-                            Stroke = line.Stroke,
+                            Stroke = isGrayscale ? Brushes.Black : line.Stroke,
                             StrokeThickness = line.StrokeThickness,
                             StrokeDashArray = line.StrokeDashArray,
                             StartPoint = new Point(line.StartPoint.X - minX, line.StartPoint.Y - minY),
@@ -794,33 +817,62 @@ namespace NetworkDiagram
                             CornerRadius = new CornerRadius(8),
                             Padding = new Thickness(12),
                             Background = Brushes.White,
-                            BorderBrush = (IBrush)Application.Current!.FindResource("GridBlue")!,
-                            BorderThickness = new Thickness(1),
-                            Width = original.Bounds.Width > 0 ? original.Bounds.Width : 120,
-                            Height = original.Bounds.Height > 0 ? original.Bounds.Height : 100,
-                            DataContext = device
+                            BorderBrush = gridBlue ?? Brushes.Blue,
+                            BorderThickness = new Thickness(isGrayscale ? 2 : 1),
+                            MinWidth = 100,
+                            MinHeight = 80,
+                            MaxWidth = 180
                         };
 
                         var stack = new StackPanel { Spacing = 4 };
-                        var img = new Image { Width = 64, Height = 64 };
-                        img.Bind(Image.SourceProperty, new Avalonia.Data.Binding("IconPath") { Converter = ImageConverter.Instance });
+                        
+                        var img = new Image { Width = 64, Height = 64, HorizontalAlignment = Avalonia.Layout.HorizontalAlignment.Center };
+                        if (ImageConverter.Instance.Convert(device.IconPath, typeof(IImage), null, System.Globalization.CultureInfo.CurrentCulture) is IImage iimg)
+                        {
+                            img.Source = iimg;
+                        }
 
                         var txt = new TextBlock {
                             Text = device.Name,
                             FontWeight = FontWeight.Bold,
+                            FontSize = isGrayscale ? 14 : 12,
                             HorizontalAlignment = Avalonia.Layout.HorizontalAlignment.Center,
-                            Foreground = (IBrush)Application.Current!.FindResource("PrimaryBlue")!
+                            TextWrapping = TextWrapping.Wrap,
+                            TextAlignment = TextAlignment.Center,
+                            Foreground = primaryBlue
                         };
 
                         stack.Children.Add(img);
                         stack.Children.Add(txt);
 
-                        var ips = new ItemsControl { ItemsSource = device.IpAddresses };
-                        ips.ItemTemplate = new FuncDataTemplate<string>((val, _) => new TextBlock {
-                            Text = val, FontSize = 10, HorizontalAlignment = Avalonia.Layout.HorizontalAlignment.Center,
-                            Foreground = (IBrush)Application.Current!.FindResource("AccentBlue")!
-                        });
-                        stack.Children.Add(ips);
+                        if (!string.IsNullOrWhiteSpace(device.Description))
+                        {
+                            var desc = new TextBlock {
+                                Text = device.Description,
+                                FontSize = isGrayscale ? 18 : 11,
+                                FontWeight = isGrayscale ? FontWeight.Bold : FontWeight.Normal,
+                                FontStyle = FontStyle.Italic,
+                                HorizontalAlignment = Avalonia.Layout.HorizontalAlignment.Center,
+                                TextWrapping = TextWrapping.Wrap,
+                                TextAlignment = TextAlignment.Center,
+                                Foreground = textDark,
+                                Opacity = isGrayscale ? 1.0 : 0.8
+                            };
+                            stack.Children.Add(desc);
+                        }
+
+                        foreach (var ip in device.IpAddresses)
+                        {
+                            var tb = new TextBlock {
+                                Text = ip,
+                                FontSize = isGrayscale ? 14 : 10,
+                                FontWeight = isGrayscale ? FontWeight.Bold : FontWeight.Normal,
+                                HorizontalAlignment = Avalonia.Layout.HorizontalAlignment.Center,
+                                TextWrapping = TextWrapping.Wrap,
+                                Foreground = accentBlue
+                            };
+                            stack.Children.Add(tb);
+                        }
 
                         clone.Child = stack;
                         Canvas.SetLeft(clone, device.X - minX);
@@ -836,8 +888,65 @@ namespace NetworkDiagram
                 await Task.Delay(100);
                 rtb.Render(container);
 
-                using var stream = await file.OpenWriteAsync();
-                rtb.Save(stream);
+                if (result == ExportOption.BlackAndWhite)
+                {
+                    using var ms = new MemoryStream();
+                    rtb.Save(ms);
+                    ms.Position = 0;
+                    var wb = WriteableBitmap.Decode(ms);
+                    ApplyGrayscale(wb);
+                    using var stream = await file.OpenWriteAsync();
+                    wb.Save(stream);
+                }
+                else
+                {
+                    using var stream = await file.OpenWriteAsync();
+                    rtb.Save(stream);
+                }
+            }
+        }
+
+        private void ApplyGrayscale(WriteableBitmap bitmap)
+        {
+            using (var lockedBitmap = bitmap.Lock())
+            {
+                int totalBytes = lockedBitmap.RowBytes * lockedBitmap.Size.Height;
+                byte[] buffer = new byte[totalBytes];
+                Marshal.Copy(lockedBitmap.Address, buffer, 0, totalBytes);
+
+                for (int y = 0; y < lockedBitmap.Size.Height; y++)
+                {
+                    int rowOffset = y * lockedBitmap.RowBytes;
+                    for (int x = 0; x < lockedBitmap.Size.Width; x++)
+                    {
+                        int i = rowOffset + x * 4;
+                        if (i + 3 >= totalBytes) continue;
+
+                        byte b = buffer[i];
+                        byte g = buffer[i + 1];
+                        byte r = buffer[i + 2];
+                        byte a = buffer[i + 3];
+
+                        if (a < 128)
+                        {
+                            // Transparent -> White
+                            buffer[i] = 255;
+                            buffer[i + 1] = 255;
+                            buffer[i + 2] = 255;
+                        }
+                        else
+                        {
+                            // Standard luminance for grayscale
+                            byte val = (byte)(0.299 * r + 0.587 * g + 0.114 * b);
+                            buffer[i] = val;
+                            buffer[i + 1] = val;
+                            buffer[i + 2] = val;
+                        }
+                        buffer[i + 3] = 255; // Always opaque for printing
+                    }
+                }
+
+                Marshal.Copy(buffer, 0, lockedBitmap.Address, totalBytes);
             }
         }
         #endregion

NetworkDiagram/Models/DiagramModels.cs

@@ -38,6 +38,19 @@ namespace NetworkDiagram.Models
             }
         }
 
+        private string _description = string.Empty;
+
+        [JsonPropertyName("Description")]
+        public string Description
+        {
+            get => _description;
+            set
+            {
+                _description = value;
+                OnPropertyChanged();
+            }
+        }
+
         [JsonPropertyName("TemplateName")]
         public string TemplateName { get; set; } = string.Empty;