Tuned platformer physics

src/components/PlayerPhysicsController.cs

@@ -16,14 +16,39 @@ public partial class PlayerPhysicsController : CharacterBody2D {
     [Export]
     public float JumpScale { get; set; } = 12;
 
+    [Export]
+    public float FrictionCoefficent { get; set; } = 0.1f;
+
     [Export]
     public Label DebugTextLabel { get; set; }
 
     [Export]
-    public float Gravity { get; set; } = 9.8f;
+    public AnimatedSprite2D Sprite { get; set; }
+
+    [Export]
+    public float Gravity { get; set; } = 980f;
 
     private float _timeInFlight = 0;
 
+    private float epsilon = 10e-5f;
+    
+    public override void _Process(double delta) {
+        var grounded = this.IsOnFloor();
+        var absvel = new Vector2(Mathf.Abs(Velocity.X), Mathf.Abs(Velocity.Y));
+        Sprite.FlipH = Velocity.X < 0;
+        if (grounded && absvel.X > 0) {
+            Sprite.Play("walk", absvel.X switch {
+                < 10 => 1,
+                < 150 => 2,
+                < 300 => 4,
+                _ => 1
+            });
+        } else if (grounded && absvel.X < epsilon && absvel.Y < epsilon) {
+            Sprite.Play("idle");
+        }
+    }
+
+
     public override void _PhysicsProcess(double delta) {
         var xAxis = Input.GetAxis("move_left", "move_right") * MovementScale;
         var yAxis = Input.GetAxis("look_up", "look_down");
@@ -39,17 +64,21 @@ public partial class PlayerPhysicsController : CharacterBody2D {
             _timeInFlight = 0;
         
         jumpStrength *= Mathf.Exp(-JumpStrengthDecay * _timeInFlight);
+        
+        // autorun
+        var friction = Mathf.Abs(Velocity.X) > 125 ? FrictionCoefficent * 1/8f : FrictionCoefficent;
+        // var decay = Mathf.Abs(Velocity.X) > 125 ? MovementDecay * 1/4f : MovementDecay;
         xAxis *= Mathf.Exp(-MovementDecay * Mathf.Abs(Velocity.X));
+        xAxis -= Velocity.X * friction;
 
-
-        var moveVector = new Vector2(xAxis, Gravity + jumpStrength);
-        DebugTextLabel.Text = $"grounded: {grounded}\nmv: {moveVector}\njumpStrength: {jumpStrength}\ntimeInFlight: {_timeInFlight}"; 
+        var moveVector = new Vector2((float)(delta * xAxis), (float)( delta * (Gravity + jumpStrength)));
+        DebugTextLabel.Text = $"grounded: {grounded}\nmv: {moveVector}\n vel: {Velocity}\n jumpStrength: {jumpStrength}\ntimeInFlight: {_timeInFlight}"; 
         Velocity += moveVector; 
         MoveAndSlide();
 
         if (!grounded)
             _timeInFlight += (float)delta;
-        base._Process(delta);
+        base._PhysicsProcess(delta);
 
     }