finish snap notes

Scripts/Things/TunnelObjects/SnapArrows.cs

@@ -1,15 +1,57 @@
 using Godot;
 using System;
+using System.Linq;
+using WacK;
 
 public partial class SnapArrows : HBoxContainer
 {
+	private TextureRect[] arrows = new TextureRect[20];
+
 	// Called when the node enters the scene tree for the first time.
 	public override void _Ready()
 	{
+		var c = GetChildren();
+		for(int i = 0; i < 20; ++i)
+		{
+			arrows[i] = (TextureRect) c[i];
+		}
 	}
 
-	// Called every frame. 'delta' is the elapsed time since the previous frame.
-	public override void _Process(double delta)
+	/// <summary>
+	/// Make sure to run as CallDeferred if constructing!
+	/// </summary>
+	/// <param name="pos"></param>
+	/// <param name="size"></param>
+	/// <param name="isIn"></param>
+	public void Init(int pos, int size, bool isIn)
 	{
+		var nVis = Math.Clamp(size / 3, 1, 20);
+			
+		for(int i = 0; i < arrows.Count(); ++i)
+		{
+			if (i < nVis)
+			{
+				arrows[i].Visible = true;
+				((ShaderMaterial)arrows[i].Material)
+					.SetShaderParameter("isIn", isIn);
+			}
+			else
+			{
+				arrows[i].Visible = false;
+			}
+		}
+
+		// shrink
+		var s = Size;
+		s.X = 0;
+		Size = s;
+
+		var (posPx, sizePx) = Util.PixelizeNote(pos, size);
+		var noteCtrPos = posPx + sizePx / 2;
+
+		// reposition
+		var p = Position;
+		p.X = -Size.X / 2 + noteCtrPos;
+		Position = p;
 	}
 }