Completed Shape.cs and Program.cs

Shapes/Program.cs

@@ -33,7 +33,22 @@ void Run()
 
 void HandleClick(ClickEvent @event)
 {
-    // TODO - handle click at location
+    // Check if clicked on existing shape
+    foreach (var shape in shapes.ToList())
+    {
+        if (shape.PointInShape(@event.ClickedPoint))
+        {
+            shapes.Remove(shape);
+            Console.WriteLine($"Removed shape with id {shape.Id}");
+            Redraw();
+            return;
+        }
+    }
+    
+    // Create new shape
+    var generatedShape = generator.CreateNewShape(@event.ClickedPoint);
+    shapes.Add(generatedShape);
+    Console.WriteLine($"Added shape with id {generatedShape.Id}");
 
     Redraw();
 }

Shapes/Shapes/Shape.cs

@@ -1,21 +1,54 @@
-using System.Numerics;
+using Avalonia;
+using Avalonia.Media;
 
 namespace Shapes.Shapes;
 
 public abstract class Shape
 {
     private static int _nextId = 1;
+    // Ripped from https://github.com/haslingerm/simple-xplat-drawing/blob/master/SimpleDrawing/LeoCanvas.cs#L26
+    protected const double DefaultLineThickness = 1D;
     public int Id { get; }
-    protected Vector2 Scale;
+    protected Point Scale;
-    protected Vector2 Position;
+    protected Point Position;
+    protected double? LineThickness;
+    protected IBrush? LineColor;
+    protected IBrush? FillColor;
 
-    protected Shape(Vector2 position, Vector2 scale)
+    /// <summary>
+    /// The base constructor for all shapes
+    /// </summary>
+    /// <param name="position">The position of the shape</param>
+    /// <param name="scale">The scale of the shape</param>
+    /// <param name="lineThickness">The thickness of the line (optional)</param>
+    /// <param name="lineColor">The color of the line (optional)</param>
+    /// <param name="fillColor">The color of the fill (optional)</param>
+    protected Shape(Point position, Point scale, double? lineThickness = null, IBrush? lineColor = null, IBrush? fillColor = null)
     {
         Id = _nextId++;
         Position = position;
         Scale = scale;
+        LineThickness = lineThickness;
+        LineColor = lineColor;
+        FillColor = fillColor;
     }
     
-    public abstract bool DrawSelf(Vector2 position = default, Vector2 scale = default);
+    /// <summary>
-    public abstract bool PointInShape(Vector2 mousePoint);
+    /// Draws the shape
+    /// Not specified values will use the stored ones at the instance creation
+    /// </summary>
+    /// <param name="position">The position of the shape (optional)</param>
+    /// <param name="scale">The scale of the shape (optional)</param>
+    /// <param name="lineThickness">The thickness of the line (optional)</param>
+    /// <param name="lineColor">The color of the line (optional)</param>
+    /// <param name="fillColor">The color of the fill (optional)</param>
+    /// <returns>True if the drawing was successful, false otherwise</returns>
+    public abstract bool DrawSelf(Point position = default, Point scale = default, double? lineThickness = null, IBrush? lineColor = null, IBrush? fillColor = null);
+    
+    /// <summary>
+    /// Checks if the <see cref="mousePoint"/> is inside the shape
+    /// </summary>
+    /// <param name="mousePoint">The mouse point</param>
+    /// <returns>True if the mouse point is inside the shape, false otherwise</returns>
+    public abstract bool PointInShape(Point mousePoint);
 }