Добавлена возможность дискретного изменения геометрических параметров

MainWindow.axaml

@@ -21,7 +21,10 @@
             <gif:GifImage Name="LoadingGif" IsVisible="False" SourceUriRaw="{Binding Path=SelectedGif}"
                           Stretch="None"
                           StretchDirection="Both" />
-            <TextBlock Name="TEST_text" Text=""/>
+            <CheckBox Name="StrictModeEnabled" IsChecked="False" >Строгий режим</CheckBox>
+            <TextBox Name="StrictModeValue" Text="1" Margin="5,0,0,0"
+                     PropertyChanged="StrictModeEnabled_OnPropertyChanged" VerticalAlignment="Center" HorizontalAlignment="Center"
+                     VerticalContentAlignment="Center"/>
 
         </StackPanel>
 

MainWindow.axaml.cs

@@ -115,8 +115,8 @@ private void jCanvas_OnPointerMoved(object? sender, PointerEventArgs e)
 
         if (movable.IsPressed && !LCtrlPressed)
         {
-            Canvas.SetLeft(element, mousePosition.X - mov_hw);
-            Canvas.SetTop(element, mousePosition.Y - mov_hh);
+            Canvas.SetLeft(element, CorrectCoords(mousePosition.X - mov_hw));
+            Canvas.SetTop(element, CorrectCoords(mousePosition.Y - mov_hh));
 
             if (Canvas.GetLeft(element) < 0)
                 Canvas.SetLeft(element, 0);
@@ -138,8 +138,8 @@ private void jCanvas_OnPointerMoved(object? sender, PointerEventArgs e)
             mousePosition = e.GetPosition(element);
             if(mousePosition.X<5 || mousePosition.Y<5)
                 return;
-            element.Width = mousePosition.X;
-            element.Height = mousePosition.Y;
+            element.Width = CorrectSize(mousePosition.X);
+            element.Height = CorrectSize(mousePosition.Y);
         }
     }
 

Miscellaneous.cs

@@ -160,8 +160,33 @@ public void AddPropItem(string name, object? value,Type type)
 
     private SolidColorBrush GetColor(string color)
         => new SolidColorBrush(Color.Parse(color));
-
 
+    //Корректировка координат для перемещения и растяжения в строгом режиме
+    double CorrectCoords(double coord)
+    {
+        if ((bool)!StrictModeEnabled.IsChecked) return coord;
+        if(StrictModeValue.Text == "") return coord;
+        int step = Convert.ToInt32(StrictModeValue.Text);
+        if (step <= 0) return coord;
+        var _coord = (((int)coord)/step)*step;
+        return _coord;
+
+    }
+    double CorrectSize(double coord)
+        => CorrectCoords(coord)>0?CorrectCoords(coord):Convert.ToInt32(StrictModeValue.Text);
 
 
+    private void StrictModeEnabled_OnPropertyChanged(object? sender, AvaloniaPropertyChangedEventArgs e)
+    {
+        if (StrictModeValue == null) return;
+        try
+        {
+            var value = Convert.ToInt32(StrictModeValue.Text);
+            StrictModeValue.Text = Math.Abs(value).ToString();
+        }
+        catch 
+        {
+            StrictModeValue.Text = "";
+        }
+    }
 }