From ced3d03bdb3ce866d832e03fb212865140905a9a Mon Sep 17 00:00:00 2001
From: Thomas Leyh <leyh.thomas@web.de>
Date: Sun, 24 Jul 2016 08:14:18 +0200
Subject: Add project files.

---
 V3/Objects/Movement/PlayerMovement.cs | 155 ++++++++++++++++++++++++++++++++++
 1 file changed, 155 insertions(+)
 create mode 100644 V3/Objects/Movement/PlayerMovement.cs

(limited to 'V3/Objects/Movement/PlayerMovement.cs')

diff --git a/V3/Objects/Movement/PlayerMovement.cs b/V3/Objects/Movement/PlayerMovement.cs
new file mode 100644
index 0000000..326503f
--- /dev/null
+++ b/V3/Objects/Movement/PlayerMovement.cs
@@ -0,0 +1,155 @@
+using System.Collections.Generic;
+using Microsoft.Xna.Framework;
+using V3.Data;
+using V3.Map;
+
+namespace V3.Objects.Movement
+{
+    // TODO: Rename the class. Current name is unfitting. (But what is fitting?)
+    /// <summary>
+    /// Movement scheme for moving an object with the pathfinder.
+    /// </summary>
+    public class PlayerMovement : IMovable
+    {
+        private const int CellHeight = Constants.CellHeight;
+        private const int CellWidth = Constants.CellWidth;
+        private const float SpeedModifier = 0.25f;
+
+        private List<Vector2> mPath;
+        private int mStep;
+        private Vector2 mLastMovement;
+
+        public bool IsMoving { get; private set; }
+
+        /// <summary>
+        /// Calculates a path without collisions to desired destination.
+        /// </summary>
+        /// <param name="pathfinder">Pathfinder to use.</param>
+        /// <param name="position">Current position in pixel.</param>
+        /// <param name="destination">Destination in pixel.</param>
+        public void FindPath(Pathfinder pathfinder, Vector2 position, Vector2 destination)
+        {
+            mStep = 0;
+            mPath = pathfinder.FindPath(new Vector2((int)(position.X / CellWidth), (int)(position.Y / CellHeight)),
+                new Vector2((int)(destination.X / CellWidth), (int)(destination.Y / CellHeight)));
+            IsMoving = mPath.Count > 0;
+        }
+
+        /// <summary>
+        /// Uses pathfinder to for steady movement to new transition.
+        /// </summary>
+        /// <param name="currentPosition">Current position in pixel.</param>
+        /// <param name="speed">Movement speed of the creature.</param>
+        /// <returns>Normalized vector * speed which represents a small step in the direction of desired destination.(</returns>
+        public virtual Vector2 GiveNewPosition(Vector2 currentPosition, int speed)
+        {
+            Vector2 nextPosition = mPath[mStep];
+            Vector2 newPosition = nextPosition - currentPosition;
+            newPosition.Normalize();
+            float distanceToDestination = Vector2.Distance(nextPosition, currentPosition);
+            if (distanceToDestination < SpeedModifier * speed)
+            {
+                if (mStep == mPath.Count - 1)
+                {
+                    IsMoving = false;
+                }
+                else
+                {
+                    mStep++;
+                }
+            }
+            mLastMovement = newPosition;
+            return newPosition * SpeedModifier * speed;
+        }
+
+        /// <summary>
+        /// Calculates the direction the creature is looking when moving.
+        /// </summary>
+        public MovementDirection GiveMovementDirection()
+        {
+            //   |\
+            //   |α\        α == 22.5°
+            //  b|  \ 1     β == 67.5°
+            //   |  β\
+            //   ──────
+            //     a
+            const float b = 0.92f;  // b == sin β
+            const float a = 0.38f;  // a == sin α
+            Vector2 direction = mLastMovement;
+            MovementDirection movementDirection;
+            if (direction.X < -b)
+            {
+                movementDirection = MovementDirection.W;
+            }
+            else if (direction.X > b)
+            {
+                movementDirection = MovementDirection.O;
+            }
+            else if (direction.Y > 0)
+            {
+                if (direction.X < -a)
+                {
+                    movementDirection = MovementDirection.SW;
+                }
+                else if (direction.X > a)
+                {
+                    movementDirection = MovementDirection.SO;
+                }
+                else
+                {
+                    movementDirection = MovementDirection.S;
+                }
+            }
+            else
+            {
+                if (direction.X < -a)
+                {
+                    movementDirection = MovementDirection.NW;
+                }
+                else if (direction.X > a)
+                {
+                    movementDirection = MovementDirection.NO;
+                }
+                else
+                {
+                    movementDirection = MovementDirection.N;
+                }
+            }
+            return movementDirection;
+        }
+        /// <summary>
+        /// Save the movement data to a MovementData object.
+        /// </summary>
+        /// <returns>the MovementData object with the current status</returns>
+        public MovementData SaveData()
+        {
+            var data = new MovementData();
+            data.IsMoving = IsMoving;
+            if (IsMoving)
+            {
+                data.Path = mPath;
+                data.Step = mStep;
+                data.LastMovement = mLastMovement;
+            }
+            return data;
+        }
+
+        /// <summary>
+        /// Restore the movement state from the given data.
+        /// </summary>
+        /// <param name="movementData">the state of the movement to restore</param>
+        public void LoadData(MovementData movementData)
+        {
+            if (movementData == null)
+                return;
+
+            IsMoving = movementData.IsMoving;
+            if (IsMoving)
+            {
+                mPath = movementData.Path;
+                mStep = movementData.Step;
+                mLastMovement = movementData.LastMovement;
+            }
+        }
+    }
+}
-- 
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