1 files changed, 11 insertions, 11 deletions

diff --git a/Portal.h b/Portal.h
index 858caf8..6acd1f3 100644
--- a/Portal.h
+++ b/Portal.h
@@ -88,15 +88,19 @@ class Portal : public LevelObject, public VertexProvider {
       updateVertices();
     }
     
-    virtual void rotate(float a) {
+    virtual void rotate(Vertex m, float a) {
       orient = fmodf(orient+a, 2*M_PI);
+      
+      s = sinf(a);
+      c = cosf(a);
+      
+      pos -= m;
+      pos.setLocation(c*pos.getX() - s*pos.getY(), c*pos.getY() + s*pos.getX());
+      pos += m;
+      
       updateOrient();
     }
     
-    virtual Vertex getCenter() const {
-      return pos;
-    }
-    
     virtual const Vertex* getVertex(size_t id) const {
       return &vertices[id];
     }
@@ -109,12 +113,8 @@ class Portal : public LevelObject, public VertexProvider {
       move(x, y);
     }
     
-    virtual void rotateVertex(size_t id, float a) {
-      pos = vertices[id];
-      rotate(a);
-      pos = vertices[(id+2)%4];
-      
-      updateVertices();
+    virtual void rotateVertex(size_t id, Vertex m, float a) {
+      rotate(m, a);
     }
 };