Bug Fix

Scenes/SingleBond.cs

@@ -0,0 +1,97 @@
+using System;
+using Godot;
+using VirtualChemDemo.Concepts;
+
+public partial class SingleBond : Bond2D
+{
+	private static int BIndex(int index, int multi)
+	{
+		if (multi == 1)
+			return 0;
+		if (multi % 2 == 1)
+		{
+			int center = multi / 2 + 1;
+			return center - index;
+		}
+
+		if (multi % 2 == 0)
+		{
+			double center = multi / 2 + 0.5;
+			return (int)(center > index ? Math.Ceiling(center - index) : Math.Floor(center - index));
+		}
+
+		return 0;
+	}
+	private void MakeCurve(float curveRate=20f, int cDir = 1)
+	{
+		Vector2 Start = AtomFrom.Position + new Vector2(32, 32);;
+		Vector2 End = AtomTo.Position + new Vector2(32, 32);;
+		Vector2[] xs = new Vector2[17];
+		int[] x2 = new[] { 4, 12 };
+		int[] x3 = new[] { 2, 6, 10, 14};
+		int[] x4 = new[] { 1, 3, 5, 7, 9, 11, 13, 15 };
+		Vector2 vd = End - Start;
+		Vector2 nor = vd.Rotated(Mathf.Pi / 2 * cDir);
+		Vector2 center = vd / 2 + 4f * nor / curveRate;
+		xs[0] = Start;
+		xs[16] = End;
+		xs[8] = center + xs[0];
+		foreach (int i in x2)
+		{
+			Vector2 v = xs[i + 4] - xs[i - 4];
+			Vector2 n = v.Rotated(Mathf.Pi / 2 * cDir);
+			Vector2 w = v / 2 + 2f * n / curveRate;
+			xs[i] = w + xs[i - 4];
+		}
+
+		foreach (int i in x3)
+		{
+			Vector2 v = xs[i + 2] - xs[i - 2];
+			Vector2 n = v.Rotated(Mathf.Pi / 2 * cDir);
+			Vector2 w = v / 2 + n / curveRate;
+			xs[i] = w + xs[i - 2];
+		}
+
+		foreach (int i in x4)
+		{
+			Vector2 v = xs[i + 1] - xs[i - 1];
+			Vector2 n = v.Rotated(Mathf.Pi / 2 * cDir);
+			Vector2 w = v / 2 + n / curveRate;
+			xs[i] = w + xs[i - 1];
+		}
+		BondTypeA.Position = xs[10];
+		BondTypeB.Position = xs[6];
+		Points = xs;
+	}
+
+	public override void BondUpdate()
+	{
+		Reindex();
+		int bindex = BIndex(Index, Multi);
+		if (bindex == 0)
+		{
+			Vector2 v1 = AtomFrom.Position + new Vector2(32, 32);
+			Vector2 v2 = AtomTo.Position + new Vector2(32, 32);
+			Vector2 m = (v1 + v2) / 2;
+			Points = new[] { v1, m, v2 };
+			BondTypeA.Position = m - new Vector2(10, 10);
+			BondTypeB.Position = m + new Vector2(10, 10);
+		}
+		else
+		{
+			float curveRate = 25 - Math.Abs(bindex)*5;
+			int cDir = bindex > 0 ? 1 : -1;
+			MakeCurve(curveRate, cDir);
+		}
+
+		
+
+		BondTypeA.Text = BondFrom.BondType;
+		BondTypeB.Text = BondTo.BondType;
+	}
+
+	// Called every frame. 'delta' is the elapsed time since the previous frame.
+	public override void _Process(double delta)
+	{
+	}
+}