Initial Commit

Assets/Scripts/Util/RectExtensions.cs

@@ -0,0 +1,73 @@
+using UnityEngine;
+
+namespace Trive.Assets.Scripts.Utils.Extensions
+{
+	public static class RectExtensions
+	{
+		/// <summary>
+		/// Scales a rect by a given amount around its center point
+		/// </summary>
+		/// <param name="rect">
+		/// The given rect
+		/// </param>
+		/// <param name="scale">
+		/// The scale factor
+		/// </param>
+		/// <returns>
+		/// The given rect scaled around its center
+		/// </returns>
+		public static Rect ScaleSizeBy(this Rect rect, float scale)
+		{
+			return rect.ScaleSizeBy(scale, rect.center);
+		}
+
+		/// <summary>
+		/// Scales a rect by a given amount and around a given point
+		/// </summary>
+		/// <param name="rect">
+		/// The rect to size
+		/// </param>
+		/// <param name="scale">
+		/// The scale factor
+		/// </param>
+		/// <param name="pivotPoint">
+		/// The point to scale around
+		/// </param>
+		/// <returns>
+		/// The rect, scaled around the given pivot point
+		/// </returns>
+		public static Rect ScaleSizeBy(this Rect rect, float scale, Vector2 pivotPoint)
+		{
+			var result = rect;
+
+			//"translate" the top left to something like an origin
+			result.x -= pivotPoint.x;
+			result.y -= pivotPoint.y;
+
+			//Scale the rect
+			result.xMin *= scale;
+			result.yMin *= scale;
+			result.xMax *= scale;
+			result.yMax *= scale;
+
+			//"translate" the top left back to its original position
+			result.x += pivotPoint.x;
+			result.y += pivotPoint.y;
+
+			return result;
+		}
+
+		public static Rect Encapculate(this Rect rect, Vector2 point)
+		{
+			var min = rect.min;
+			var max = rect.max;
+
+			min.x = Mathf.Min(min.x, point.x);
+			min.y = Mathf.Min(min.y, point.y);
+			max.x = Mathf.Max(max.x, point.x);
+			max.y = Mathf.Max(max.y, point.y);
+
+			return new Rect(min.x, min.y, max.x - min.x, max.y - min.y);
+		}
+	}
+}