baseline: OpenMU upstream b5a0961 (fresh source)

src/GameLogic/PointExtensions.cs

@@ -0,0 +1,49 @@
+// <copyright file="PointExtensions.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.GameLogic;
+
+using MUnique.OpenMU.Pathfinding;
+
+/// <summary>
+/// Extensions for <see cref="Point"/>.
+/// </summary>
+public static class PointExtensions
+{
+    /// <summary>
+    /// Determines whether if the point is within bounds of the specified rectangle.
+    /// The border points of the rectangle are inclusive.
+    /// </summary>
+    /// <param name="point">The point.</param>
+    /// <param name="rectangle">The rectangle.</param>
+    /// <returns><c>true</c> if the point is within bounds of the specified rectangle; otherwise, <c>false</c>.</returns>
+    public static bool IsWithinBoundsOf(this Point point, Rectangle rectangle)
+    {
+        return point.X >= rectangle.X1
+               && point.X <= rectangle.X2
+               && point.Y >= rectangle.Y1
+               && point.Y <= rectangle.Y2;
+    }
+
+    /// <summary>
+    /// Gets the angle degree from start point to a target point.
+    /// </summary>
+    /// <param name="start">The start point.</param>
+    /// <param name="target">The target point.</param>
+    /// <returns>The angle between 0 and 360 degree.</returns>
+    /// <remarks>This matches with the angle which gets received by area skill packets.</remarks>
+    public static double GetAngleDegreeTo(this Point start, Point target)
+    {
+        var diffX = start.X - target.X;
+        var diffY = start.Y - target.Y;
+        var radian = Math.Atan2(diffY, diffX);
+        var result = (radian * 180 / Math.PI) - 90;
+        if (result < 0)
+        {
+            result += 360;
+        }
+
+        return result;
+    }
+}