DynamicField · May 12, 2018 09:02 · May 12, 2018
diff --git a/UIElement.cs b/UIElement.cs
@@ -0,0 +1,50 @@
+using Cosmos.System.Graphics;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace DongOSEvolved.UI
+{
+    public abstract class UIElement
+    {
+        // The problem with this technique is that if it's the same color,
+        // it doesn't recognize the shape.
+        public virtual List<Pixel> Draw(Canvas c)
+        {
+            var before = GetAllPixels(c);
+            DrawShape(c);
+            var after = GetAllPixels(c);
+            var pixelsChanged = new List<Pixel>();
+            // Normally i won't have to check the length of both.
+            for (int i = 0; i < before.Length; i++)
+            {
+                if (before[i] != after[i])
+                {
+                    pixelsChanged.Add(after[i]);
+                }
+            }
+            return pixelsChanged;
+        }
+
+        private static Pixel[] GetAllPixels(Canvas c)
+        {
+            var totalPixels = c.Mode.Columns * c.Mode.Rows;
+            Pixel[] allPoints = new Pixel[totalPixels];
+            int x = 0, y = 0;
+            for (int i = 0; i < totalPixels; i++)
+            {
+                allPoints[i] = new Pixel(c.GetPointColor(x, y), new Point(x, y));
+                y++;
+                if (y >= c.Mode.Columns - 1) // Go to the line under it
+                {
+                    y = 0;
+                    ++x; // it's better than x++ for some reason.
+                }
+            }
+            return allPoints;
+        }
+
+        protected abstract void DrawShape(Canvas c);
+        public int Layer { get; set; } = 0;
+    }
+}