1 files changed, 109 insertions, 0 deletions
diff --git a/svx/source/engine3d/e3dsceneupdater.cxx b/svx/source/engine3d/e3dsceneupdater.cxx
new file mode 100644
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+++ b/svx/source/engine3d/e3dsceneupdater.cxx
@@ -0,0 +1,109 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <svx/e3dsceneupdater.hxx>
+#include <drawinglayer/geometry/viewinformation3d.hxx>
+#include <svx/obj3d.hxx>
+#include <svx/scene3d.hxx>
+#include <svx/sdr/contact/viewcontactofe3dscene.hxx>
+
+
+E3DModifySceneSnapRectUpdater::E3DModifySceneSnapRectUpdater(const SdrObject* pObject)
+:   mpScene(nullptr)
+{
+    // Secure old 3D transformation stack before modification
+    const E3dObject* pE3dObject = DynCastE3dObject(pObject);
+    if(!pE3dObject)
+        return;
+
+    mpScene = pE3dObject->getRootE3dSceneFromE3dObject();
+
+    if(nullptr == mpScene || mpScene->getRootE3dSceneFromE3dObject() != mpScene)
+        return;
+
+    // if there is a scene and it's the outmost scene, get current 3D range
+    const sdr::contact::ViewContactOfE3dScene& rVCScene = static_cast< sdr::contact::ViewContactOfE3dScene& >(mpScene->GetViewContact());
+    const basegfx::B3DRange aAllContentRange(rVCScene.getAllContentRange3D());
+
+    if(aAllContentRange.isEmpty())
+    {
+        // no content, nothing to do
+        mpScene = nullptr;
+    }
+    else
+    {
+        // secure current 3D transformation stack
+        mpViewInformation3D = rVCScene.getViewInformation3D(aAllContentRange);
+    }
+}
+
+E3DModifySceneSnapRectUpdater::~E3DModifySceneSnapRectUpdater()
+{
+    if(!(mpScene && mpViewInformation3D))
+        return;
+
+    // after changing parts of the scene, use the secured last 3d transformation stack and the new content
+    // range to calculate a new, eventually expanded or shrunk, 2D geometry for the scene and apply it.
+    // Get new content range
+    const sdr::contact::ViewContactOfE3dScene& rVCScene = static_cast< sdr::contact::ViewContactOfE3dScene& >(mpScene->GetViewContact());
+    basegfx::B3DRange aAllContentRange(rVCScene.getAllContentRange3D());
+
+    // only change when there is still content; else let scene stay at old SnapRect
+    if(aAllContentRange.isEmpty())
+        return;
+
+    // check if object transform of scene has changed
+    if(mpViewInformation3D->getObjectTransformation() != mpScene->GetTransform())
+    {
+        // If Yes, it needs to be updated since it's - for historical reasons -
+        // part of the basic 3d transformation stack of the scene
+        mpViewInformation3D = drawinglayer::geometry::ViewInformation3D(
+            mpScene->GetTransform(), // replace object transformation with new local transform
+            mpViewInformation3D->getOrientation(),
+            mpViewInformation3D->getProjection(),
+            mpViewInformation3D->getDeviceToView(),
+            mpViewInformation3D->getViewTime(),
+            mpViewInformation3D->getExtendedInformationSequence());
+    }
+
+    // transform content range to scene-relative coordinates using old 3d transformation stack
+    aAllContentRange.transform(mpViewInformation3D->getObjectToView());
+
+    // build 2d relative content range
+    basegfx::B2DRange aSnapRange(
+        aAllContentRange.getMinX(), aAllContentRange.getMinY(),
+        aAllContentRange.getMaxX(), aAllContentRange.getMaxY());
+
+    // transform to 2D world coordinates using scene's 2D transformation
+    aSnapRange.transform(rVCScene.getObjectTransformation());
+
+    // snap to (old) integer
+    const tools::Rectangle aNewSnapRect(
+        sal_Int32(floor(aSnapRange.getMinX())), sal_Int32(floor(aSnapRange.getMinY())),
+        sal_Int32(ceil(aSnapRange.getMaxX())), sal_Int32(ceil(aSnapRange.getMaxY())));
+
+    // set as new SnapRect and invalidate bound volume
+    if(mpScene->GetSnapRect() != aNewSnapRect)
+    {
+        mpScene->SetSnapRect(aNewSnapRect);
+        mpScene->InvalidateBoundVolume();
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */