1. svn -> git

Assets/Reference/Destructible2D/Required/Player/D2D_AutoPolygonCollider.cs

@@ -0,0 +1,122 @@
+using UnityEngine;
+
+[ExecuteInEditMode]
+[AddComponentMenu("Destructible 2D/D2D Auto Polygon Collider")]
+public class D2D_AutoPolygonCollider : D2D_Collider
+{
+	[SerializeField]
+	private PolygonCollider2D polygonCollider2D;
+	
+	public void RebuildCollider(Texture2D alphaTex)
+	{
+		DestroyPolygonCollider2D();
+		
+		if (alphaTex != null)
+		{
+			if (polygonCollider2D == null)
+			{
+				var spriteRenderer = D2D_Helper.GetOrAddComponent<SpriteRenderer>(gameObject);
+				var sprite         = Sprite.Create(alphaTex, new Rect(0, 0, alphaTex.width, alphaTex.height), Vector2.zero, 1.0f, 0, SpriteMeshType.FullRect);
+				
+				spriteRenderer.sprite = sprite;
+				
+				polygonCollider2D = gameObject.AddComponent<PolygonCollider2D>();
+				
+				// Disable the collider if it couldn't form any triangles
+				polygonCollider2D.enabled = IsDefaultPolygonCollider2D(polygonCollider2D) == false;
+				
+				UpdateColliderSettings();
+				
+				D2D_Helper.Destroy(sprite);
+				D2D_Helper.Destroy(spriteRenderer);
+			}
+		}
+	}
+	
+	public override void UpdateColliderSettings()
+	{
+		if (polygonCollider2D != null)
+		{
+			polygonCollider2D.isTrigger      = IsTrigger;
+			polygonCollider2D.sharedMaterial = Material;
+		}
+	}
+	
+	protected virtual void OnDestroy()
+	{
+		D2D_Helper.DestroyManaged(DestroyPolygonCollider2D);
+	}
+	
+	protected override void RebuildAll()
+	{
+		var destructible = D2D_Helper.GetComponentUpwards<D2D_Destructible>(transform);
+		
+		if (destructible != null)
+		{
+			RebuildCollider(destructible.AlphaTex);
+		}
+	}
+	
+	private void DestroyPolygonCollider2D()
+	{
+		if (polygonCollider2D != null)
+		{
+			D2D_Helper.Destroy(polygonCollider2D);
+			
+			polygonCollider2D = null;
+		}
+	}
+	
+	// The default collider is a pentagon, but its position and size changes based on the sprite
+	private static bool IsDefaultPolygonCollider2D(PolygonCollider2D polygonCollider2D)
+	{
+		if (polygonCollider2D == null) return false;
+		
+		if (polygonCollider2D.GetTotalPointCount() != 5) return false;
+		
+		var points  = polygonCollider2D.points;
+		var spacing = Vector2.Distance(points[0], points[4]);
+		
+		// Same spacing?
+		for (var i = 0; i < 4; i++)
+		{
+			var spacing2 = Vector2.Distance(points[i], points[i + 1]);
+			
+			if (Mathf.Approximately(spacing, spacing2) == false)
+			{
+				return false;
+			}
+		}
+		
+		var midpoint = (points[0] + points[1] + points[2] + points[3] + points[4]) * 0.2f;
+		var radius   = Vector2.Distance(points[0], midpoint);
+		
+		// Same radius?
+		for (var i = 1; i < 5; i++)
+		{
+			var radius2 = Vector2.Distance(points[i], midpoint);
+			
+			if (Mathf.Approximately(radius, radius2) == false)
+			{
+				return false;
+			}
+		}
+		
+		// Must be a pentagon then!
+		return true;
+	}
+	
+#if UNITY_EDITOR
+	protected override void SetHideFlags(HideFlags hideFlags)
+	{
+		if (polygonCollider2D != null)
+		{
+			polygonCollider2D.hideFlags = hideFlags;
+		}
+	}
+#else
+    protected override void SetHideFlags(HideFlags hideFlags)
+	{
+    }
+#endif
+}