general documentation improvements

Paths/Assets/Scenes/Default.unity

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@@ -577,6 +1349,117 @@ Transform:
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Paths/Assets/Scripts/Algorithms/AStar.cs

@@ -3,12 +3,12 @@ using UnityEngine;
 
 namespace Algorithms {
     public class AStar : IPathfinding {
-        public NodeGrid NodeGrid { get; private set; }
+        public NodeGrid NodeGrid { get; }
 
         private Stack<Node> _path;
         private List<Node> _openList;
         private List<Node> _closedList;
-        public ChangeController ChangeController { get; private set; }
+        public ChangeController ChangeController { get; }
 
         public Vector2Int Start { get; private set; }
         public Vector2Int End { get; private set; }
@@ -39,18 +39,22 @@ namespace Algorithms {
             _openList.Add(startNode);
 
             while (_openList.Count != 0) {
+                // take the first node out (lowest F score)
                 current = _openList[0];
                 _openList.RemoveAt(0);
 
+                // add it to closed list & mark
                 current.State = NodeState.Closed;
                 ChangeController.AddChange(new Change(
                     current.Position.x, current.Position.y,
                     GridNodeType.Expanded, GridNodeType.Seen));
                 _closedList.Add(current);
 
+                // exit if this is the end node
                 if (current.Position == endNode.Position)
                     break;
 
+                // look at all adjacent nodes and add them to the open list if possible
                 Node[] adjacentNodes = this.NodeGrid.GetAdjacentNodesArray(current);
                 for (int i = 0; i < adjacentNodes.Length; i++) {
                     Node node = adjacentNodes[i];
@@ -60,6 +64,7 @@ namespace Algorithms {
                         node.DistanceToTarget = NodeGrid.Manhattan(node, endNode);
                         node.Cost = node.Weight + node.Parent.Cost;
 
+                        // mark as open
                         node.State = NodeState.Open;
                         ChangeController.AddChange(new Change(node.Position.x, node.Position.y, GridNodeType.Seen,
                             GridNodeType.Empty));
@@ -95,6 +100,8 @@ namespace Algorithms {
 
         /// <summary>
         /// Attempts to clean the NodeGrid of all edits made to heuristic values and such, fast.
+        /// This is done by clearing the open and closed list, and for each node, resetting them (clearing heuristic
+        /// values and setting state back to it's default).
         /// </summary>
         public void Cleanup() {
             while (_openList.Count > 0) {

Paths/Assets/Scripts/Algorithms/NodeGrid.cs

@@ -37,8 +37,15 @@ namespace Algorithms {
             Width = this.Grid.GetLength(1);
         }
 
+        /// <summary>
+        /// Returns adjacent Node objects in each of the cardinal directions.
+        /// Only valid nodes will be included. Invalid positions will return 0 nodes.
+        /// </summary>
+        /// <param name="node">The node from which adjacents will be found.</param>
+        /// <returns>A length 4 or less list containing nodes.</returns>
+        /// <seealso cref="GetAdjacentNodesArray"/>
         public List<Node> GetAdjacentNodesList(Node node) {
-            List<Node> temp = new List<Node>();
+            List<Node> temp = new List<Node>(4);
 
             int col = node.Position.x;
             int row = node.Position.y;
@@ -51,19 +58,29 @@ namespace Algorithms {
             return temp;
         }
 
-        public bool IsValid(Node node) {
-            return IsValid(node.Position);
-        }
-
+        /// <summary>
+        /// Returns True if a Vector2Int position is within the grid's boundaries.
+        /// </summary>
+        /// <param name="position">A Vector2Int coordinate position.</param>
+        /// <returns>True if valid and real (a node with the same position exists).</returns>
         public bool IsValid(Vector2Int position) {
             return position.x >= 0 && position.y >= 0 && position.x < Width && position.y < Height;
         }
 
+        /// <summary>
+        /// Returns a 1D Array describing the valid nearby nodes.
+        /// Invalid nodes will be represented by null.
+        /// Currently only returns nodes in cardinal directions (no diagonals).
+        /// Only valid positions within the grid are returned.
+        /// </summary>
+        /// <param name="node">A valid position on the grid.</param>
+        /// <returns>A 4 length array containing valid nodes in each of the cardinal directions.</returns>
+        /// <seealso cref="GetAdjacentNodesList"/>
         public Node[] GetAdjacentNodesArray(Node node) {
             int col = node.Position.x;
             int row = node.Position.y;
 
-            return new [] {
+            return new[] {
                 row + 1 < Height ? Grid[col, row + 1] : null,
                 row - 1 >= 0 ? Grid[col, row - 1] : null,
                 col - 1 >= 0 ? Grid[col - 1, row] : null,
@@ -159,10 +176,10 @@ namespace Algorithms {
             // Start / End node addition
             if (start.HasValue)
                 nodeTypeGrid[start.Value.x, start.Value.y] = GridNodeType.Start;
-            
+
             if (end.HasValue)
                 nodeTypeGrid[end.Value.x, end.Value.y] = GridNodeType.End;
-            
+
             return nodeTypeGrid;
         }
     }

Paths/Assets/Scripts/Change.cs

@@ -1,4 +1,8 @@
-public readonly struct Change {
+/// <summary>
+/// A Change struct represents a Change in the grid's rendering.
+/// This struct remembers the original and new GridNodeType, the time it was recorded and of course the relevant position.
+/// </summary>
+public readonly struct Change {
     public readonly int X;
     public readonly int Y;
     public readonly GridNodeType New;

Paths/Assets/Scripts/ChangeController.cs

@@ -9,16 +9,16 @@ public class ChangeController {
     private readonly GridNodeType[,] _initial;
     public GridNodeType[,] Current { get; private set; }
     public bool[,] DirtyFlags { get; private set; }
-    public int Index { get; private set; }
+    public int CurrentChangeIndex { get; private set; }
     private readonly List<Change> _changes;
     public int Count => _changes.Count;
-    public Change CurrentChange => _changes[Index];
-    public double CurrentRuntime => _changes[Index].Time - _changes[0].Time;
+    public Change CurrentChange => _changes[CurrentChangeIndex];
+    public double CurrentRuntime => _changes[CurrentChangeIndex].Time - _changes[0].Time;
 
     public ChangeController(GridNodeType[,] initial) {
         _initial = initial;
         Current = initial;
-        Index = -1;
+        CurrentChangeIndex = -1;
         _changes = new List<Change>();
         DirtyFlags = new bool[initial.GetLength(0), initial.GetLength(1)];
         SetDirty();
@@ -73,7 +73,7 @@ public class ChangeController {
             throw new ArgumentOutOfRangeException(nameof(n));
 
         for (int i = 0; i < n; i++) {
-            Change cur = _changes[++Index];
+            Change cur = _changes[++CurrentChangeIndex];
             Current[cur.X, cur.Y] = cur.New;
             SetDirty(new Vector2Int(cur.X, cur.Y));
         }
@@ -88,11 +88,11 @@ public class ChangeController {
         if (n < 0)
             throw new ArgumentOutOfRangeException(nameof(n));
 
-        if (n > 5 && Index - n == 0)
+        if (n > 5 && CurrentChangeIndex - n == 0)
             Reset(); // resetting by copying values instead of mutating might be easier.
         else {
             for (int i = 0; i < n; i++) {
-                Change cur = _changes[Index--]; // post decrement as we apply the current Change's old, not the previous
+                Change cur = _changes[CurrentChangeIndex--]; // post decrement as we apply the current Change's old, not the previous
                 Current[cur.X, cur.Y] = cur.Old;
                 SetDirty(new Vector2Int(cur.X, cur.Y));
             }
@@ -124,7 +124,7 @@ public class ChangeController {
                 $"Cannot move to change index {index}. Only indexes from 0 to {_changes.Count - 1} are valid.");
 
         // diff & move to
-        int diff = index - Index;
+        int diff = index - CurrentChangeIndex;
         if (diff != 0)
             // prefer resetting if index is 0 and it needs to move at least some.
             if (index == 0 && diff > 5)

Paths/Assets/Scripts/CustomSlider.cs

@@ -1,7 +1,13 @@
 using UnityEngine.EventSystems;
 using UnityEngine.UI;
 
+/// <summary>
+/// A simple custom slider implementation that adds a single boolean field; IsPressed.
+/// </summary>
 public class CustomSlider: Slider {
+    /// <summary>
+    /// Whether or not the Slider is currently being pressed on by the Left Click mouse button.
+    /// </summary>
     public new bool IsPressed { get; private set; }
     
     public override void OnPointerDown(PointerEventData eventData)

Paths/Assets/Scripts/GridController.cs

@@ -29,6 +29,7 @@ public class GridController : MonoBehaviour {
 
     private void Start() {
         _values = new int[width * height];
+        // TODO: Decide at some point how to improve how the ComputerBuffer's size is allocated.
         _buffer = new ComputeBuffer((int) Mathf.Pow(2048, 2), 4);
 
         // Update all Shader properties

Paths/Assets/Scripts/UIController.cs

@@ -156,6 +156,7 @@ public class UIController : MonoBehaviour {
                     _animationState = AnimationState.Started;
                     break;
                 case AnimationState.Started:
+                    // Restart if already on final frame, else simply pause
                     if (CurrentIndex >= _state.Count)
                         _runtime = 0;
                     else
@@ -170,6 +171,7 @@ public class UIController : MonoBehaviour {
 
         switch (_animationState) {
             case AnimationState.Reloading:
+                // Reloading seizes while the mouse button is depressed
                 if (!Input.GetMouseButton(0)) {
                     GeneratePath();
                     LoadNextState();
@@ -195,6 +197,7 @@ public class UIController : MonoBehaviour {
                     LoadNextState();
                 break;
             case AnimationState.Stopped:
+                // Render editable grid when fully stopped
                 gridController.LoadGridState(_grid.RenderNodeTypes(_start, _end));
                 break;
             case AnimationState.Paused:
@@ -236,7 +239,7 @@ public class UIController : MonoBehaviour {
     /// </summary>
     /// <returns>A positive non-zero float representing how fast the current frame should be processed.</returns>
     private float CurrentMultiplier() {
-        if (_state.Index == -1)
+        if (_state.CurrentChangeIndex == -1)
             return 1;
 
         switch (_state.CurrentChange.New) {