1 files changed, 50 insertions, 0 deletions
diff --git a/ch.sycoforge.Decal.Demo/LineUtil.cs b/ch.sycoforge.Decal.Demo/LineUtil.cs
new file mode 100644
index 0000000..864ee19
--- /dev/null
+++ b/ch.sycoforge.Decal.Demo/LineUtil.cs
@@ -0,0 +1,50 @@
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace ch.sycoforge.Decal.Demo;
+
+public static class LineUtil
+{
+	public static void DrawPath(float thickness, Material material, List<Vector3> path)
+	{
+		if (path != null && (path == null || path.Count >= 2))
+		{
+			if (thickness <= Mathf.Epsilon)
+			{
+				GL.Begin(1);
+			}
+			else
+			{
+				GL.Begin(7);
+			}
+			material.SetPass(0);
+			GL.Color(Color.blue);
+			Vector3 start = path[0];
+			for (int i = 1; i < path.Count; i++)
+			{
+				Vector3 vector = path[i];
+				DrawLine(thickness, start, vector);
+				start = vector;
+			}
+			GL.End();
+		}
+	}
+
+	private static void DrawLine(float thickness, Vector3 start, Vector3 end)
+	{
+		if (thickness <= Mathf.Epsilon)
+		{
+			GL.Vertex(start);
+			GL.Vertex(end);
+			return;
+		}
+		Camera main = Camera.main;
+		Vector3 normalized = (end - start).normalized;
+		Vector3 normalized2 = (start - main.transform.position).normalized;
+		Vector3 vector = Vector3.Cross(normalized2, normalized) * (thickness / 2f);
+		GL.Vertex(start - vector);
+		GL.Vertex(start + vector);
+		GL.Vertex(end + vector);
+		GL.Vertex(end - vector);
+	}
+}