From 6094a70c4aff41d54b6ac0f22bec756357e201c1 Mon Sep 17 00:00:00 2001
From: Adam Metcalf <gambloren@gmail.com>
Date: Sat, 18 Apr 2015 22:39:49 -0700
Subject: [PATCH] Support PolygonCollider2d in 4.3 or higher.

Add support for PolygonCollider2D for Checking agaisnt 2D Colliders.
---
 .../PolyMesh/Scripts/Editor/PolyMeshEditor.cs | 43 ++++++++++++++++---
 Assets/PolyMesh/Scripts/PolyMesh.cs           | 25 ++++++++++-
 2 files changed, 60 insertions(+), 8 deletions(-)

diff --git a/Assets/PolyMesh/Scripts/Editor/PolyMeshEditor.cs b/Assets/PolyMesh/Scripts/Editor/PolyMeshEditor.cs
index 2d94fa6..c0fcd70 100644
--- a/Assets/PolyMesh/Scripts/Editor/PolyMeshEditor.cs
+++ b/Assets/PolyMesh/Scripts/Editor/PolyMeshEditor.cs
@@ -1,4 +1,8 @@
-using UnityEngine;
+#if UNITY_2_6 || UNITY_3_0 || UNITY_3_1 || UNITY_3_2 || UNITY_3_3 || UNITY_3_4 || UNITY_3_5 || UNITY_4_0 || UNITY_4_1 || UNITY_4_2
+#define UNITY_4_2_OR_LOWER
+#endif
+
+using UnityEngine;
 using UnityEditor;
 using System.Collections;
 using System.Collections.Generic;
@@ -112,6 +116,10 @@ public override void OnInspectorGUI()
 		//Create collider
 		if (colliderSettings = EditorGUILayout.Foldout(colliderSettings, "Collider"))
 		{
+#if !UNITY_4_2_OR_LOWER
+			//Polygon Collider for 2D stuff.
+			var buildColliderPolygonCollider = EditorGUILayout.Toggle("PolygonCollider2D", polyMesh.buildColliderPolygonCollider);
+#endif
 			//Collider depth
 			var colliderDepth = EditorGUILayout.FloatField("Depth", polyMesh.colliderDepth);
 			colliderDepth = Mathf.Max(colliderDepth, 0.01f);
@@ -123,6 +131,9 @@ public override void OnInspectorGUI()
 				polyMesh.colliderDepth = colliderDepth;
 				polyMesh.buildColliderEdges = buildColliderEdges;
 				polyMesh.buildColliderFront = buildColliderFront;
+#if !UNITY_4_2_OR_LOWER
+				polyMesh.buildColliderPolygonCollider = buildColliderPolygonCollider;
+#endif
 			}
 
 			//Destroy collider
@@ -131,8 +142,20 @@ public override void OnInspectorGUI()
 				if (GUILayout.Button("Create Collider"))
 				{
 					RecordDeepUndo();
+
+#if !UNITY_4_2_OR_LOWER
+					GameObject obj;
+					if (buildColliderPolygonCollider) {
+						obj = new GameObject("Collider", typeof(PolygonCollider2D));
+						polyMesh.polyCollider = obj.GetComponent<PolygonCollider2D>();
+					} else {
+						obj = new GameObject("Collider", typeof(MeshCollider));
+						polyMesh.meshCollider = obj.GetComponent<MeshCollider>();
+					}
+#else
 					var obj = new GameObject("Collider", typeof(MeshCollider));
 					polyMesh.meshCollider = obj.GetComponent<MeshCollider>();
+#endif
 					obj.transform.parent = polyMesh.transform;
 					obj.transform.localPosition = Vector3.zero;
 				}
@@ -140,7 +163,11 @@ public override void OnInspectorGUI()
 			else if (GUILayout.Button("Destroy Collider"))
 			{
 				RecordDeepUndo();
-				DestroyImmediate(polyMesh.meshCollider.gameObject);
+				if (polyMesh.meshCollider) {
+					DestroyImmediate(polyMesh.meshCollider.gameObject);
+				} else if (polyMesh.polyCollider) {
+					DestroyImmediate(polyMesh.polyCollider.gameObject);
+				}
 			}
 		}
 
@@ -296,19 +323,21 @@ void HideWireframe(bool hide)
 
 	void RecordUndo()
 	{
-#if UNITY_4_3
-		Undo.RecordObject(target, "PolyMesh Changed");
-#else
+#if UNITY_4_2_OR_LOWER
 		Undo.RegisterUndo(target, "PolyMesh Changed");
+#else
+		Undo.RecordObject(target, "PolyMesh Changed");
 #endif
 	}
 
 	void RecordDeepUndo()
 	{
-#if UNITY_4_3
+#if UNITY_4_2_OR_LOWER
+		Undo.RegisterSceneUndo("PolyMesh Changed");
+#elif UNITY_4_3
 		Undo.RegisterFullObjectHierarchyUndo(target);
 #else
-		Undo.RegisterSceneUndo("PolyMesh Changed");
+		Undo.RegisterFullObjectHierarchyUndo(target, "PolyMesh Changed");
 #endif
 
 	}
diff --git a/Assets/PolyMesh/Scripts/PolyMesh.cs b/Assets/PolyMesh/Scripts/PolyMesh.cs
index c906b44..5d82aa3 100644
--- a/Assets/PolyMesh/Scripts/PolyMesh.cs
+++ b/Assets/PolyMesh/Scripts/PolyMesh.cs
@@ -1,4 +1,8 @@
-using UnityEngine;
+#if UNITY_2_6 || UNITY_3_0 || UNITY_3_1 || UNITY_3_2 || UNITY_3_3 || UNITY_3_4 || UNITY_3_5 || UNITY_4_0 || UNITY_4_1 || UNITY_4_2
+#define UNITY_4_2_OR_LOWER
+#endif
+
+using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
@@ -9,10 +13,16 @@ public class PolyMesh : MonoBehaviour
 	public List<Vector3> curvePoints = new List<Vector3>();
 	public List<bool> isCurve = new List<bool>();
 	public MeshCollider meshCollider;
+#if !UNITY_4_2_OR_LOWER
+	public PolygonCollider2D polyCollider;
+#endif
 	[Range(0.01f, 1)] public float curveDetail = 0.1f;
 	public float colliderDepth = 1;
 	public bool buildColliderEdges = true;
 	public bool buildColliderFront;
+#if !UNITY_4_2_OR_LOWER
+	public bool buildColliderPolygonCollider;
+#endif
 	public Vector2 uvPosition;
 	public float uvScale = 1;
 	public float uvRotation;
@@ -91,6 +101,19 @@ public void BuildMesh()
 	
 	void UpdateCollider(List<Vector3> points, int[] tris)
 	{
+#if !UNITY_4_2_OR_LOWER
+		//Update the polygon collider if there is one
+		if (polyCollider != null) 
+		{
+			Vector2[] points2d = new Vector2[points.Count];
+			for (int i = 0; i < points.Count; i++) {
+				Vector3 point = points[i];
+				points2d[i] = new Vector2(point.x, point.y);
+			}
+
+			polyCollider.SetPath(0, points2d);
+		}
+#endif
 		//Update the mesh collider if there is one
 		if (meshCollider != null)
 		{