Added RectangleExtentions class

craftersmine.EtherEngine.Utilities/RectangleExtentions.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace craftersmine.EtherEngine.Utilities
+{
+    public static class RectangleExtentions
+    {
+        public static bool IsLineIntersects(this Rectangle r, int x1, int y1, int x2, int y2)
+        {
+            return IsLineIntersects(r, new Point(x1, y1), new Point(x2, y2));
+        }
+
+        public static bool IsLineIntersects(this Rectangle r, Point p1, Point p2)
+        {
+            if (r.Left > p1.X || r.Right < p2.X)
+            {
+                return false;
+            }
+
+            if (r.Top < p1.Y || r.Bottom > p2.Y)
+            {
+                return false;
+            }
+
+            var yAtRectLeft = CalculateYForX(r.Left, p1, p2);
+            var yAtRectRight = CalculateYForX(r.Right, p1, p2);
+
+            if (r.Bottom > yAtRectLeft && r.Bottom > yAtRectRight)
+            {
+                return false;
+            }
+
+            if (r.Top < yAtRectLeft && r.Top < yAtRectRight)
+            {
+                return false;
+            }
+
+            return true;
+        }
+
+        private static float CalculateYForX(float x, Point p1, Point p2)
+        {
+            return p1.Y - (x - p1.X) * ((p1.Y - p2.Y) / (p2.X - p1.X));
+        }
+    }
+}