add some mor stuff

Imaging/FiltersAreas.cs

@@ -68,5 +68,66 @@ internal static Bitmap GenerateFilter(Bitmap image,
             return ImageStream.CombineBitmap(image, filterBitmap, 0, 0);
         }
 
+        /// <summary>
+        /// Fills the area with color.
+        /// </summary>
+        /// <param name="image">The image.</param>
+        /// <param name="width">The width.</param>
+        /// <param name="height">The height.</param>
+        /// <param name="shape">The shape.</param>
+        /// <param name="shapeParams">The shape parameters.</param>
+        /// <param name="startPoint">The optional starting point (top-left corner) of the rectangle. Defaults to (0, 0).</param>
+        /// <returns>
+        /// Generates a filter for a certain area
+        /// </returns>
+        /// <exception cref="System.ArgumentOutOfRangeException">filter - null
+        /// or
+        /// shape - null</exception>
+        internal static Bitmap FillAreaWithColor(
+            Bitmap image,
+            int width,
+            int height,
+            Color color,
+            MaskShape shape,
+            object shapeParams = null,
+            Point? startPoint = null)
+        {
+            // Validate input
+            if (image == null) throw new ArgumentNullException(nameof(image));
+
+            // Default start point
+            var actualStartPoint = startPoint ?? new Point(0, 0);
+
+            using Graphics g = Graphics.FromImage(image);
+            using Brush brush = new SolidBrush(color);
+
+            // Apply mask based on the specified shape
+            switch (shape)
+            {
+                case MaskShape.Rectangle:
+                    g.FillRectangle(brush, new Rectangle(actualStartPoint, new Size(width, height)));
+                    break;
+
+                case MaskShape.Circle:
+                    g.FillEllipse(brush, new Rectangle(actualStartPoint, new Size(width, height)));
+                    break;
+
+                case MaskShape.Polygon:
+                    if (shapeParams is Point[] points)
+                    {
+                        g.FillPolygon(brush, points);
+                    }
+                    else
+                    {
+                        throw new ArgumentException("Invalid shape parameters for polygon mask.", nameof(shapeParams));
+                    }
+                    break;
+
+                default:
+                    throw new ArgumentOutOfRangeException(nameof(shape), shape, "Unsupported shape type");
+            }
+
+            return image;
+        }
     }
 }