--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Scene2D/Internals/FixedPointAligner.cpp	Fri Apr 26 17:05:14 2019 +0200
@@ -0,0 +1,51 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2019 Osimis S.A., Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Affero General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#include "FixedPointAligner.h"
+
+namespace OrthancStone
+{
+  namespace Internals
+  {
+    FixedPointAligner::FixedPointAligner(Scene2D& scene,
+                                         const ScenePoint2D& p,
+                                         unsigned int canvasWidth,
+                                         unsigned int canvasHeight) :
+      scene_(scene)
+    {
+      canvas_ = ScenePoint2D(p.GetX() - static_cast<double>(canvasWidth) / 2.0,
+                             p.GetY() - static_cast<double>(canvasHeight) / 2.0);
+      pivot_ = canvas_.Apply(scene_.GetCanvasToSceneTransform());
+    }
+
+    
+    void FixedPointAligner::Apply()
+    {
+      ScenePoint2D p = canvas_.Apply(scene_.GetCanvasToSceneTransform());
+
+      scene_.SetSceneToCanvasTransform(
+        AffineTransform2D::Combine(
+          scene_.GetSceneToCanvasTransform(),
+          AffineTransform2D::CreateOffset(p.GetX() - pivot_.GetX(),
+                                          p.GetY() - pivot_.GetY())));
+    }
+  }
+}