Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 61 insertions, 0 deletions

diff --git a/chart2/source/view/inc/Clipping.hxx b/chart2/source/view/inc/Clipping.hxx
new file mode 100644
index 000000000..e816e7aa7
--- /dev/null
+++ b/chart2/source/view/inc/Clipping.hxx
@@ -0,0 +1,61 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <basegfx/range/b2drectangle.hxx>
+
+namespace com::sun::star::drawing { struct PolyPolygonShape3D; }
+namespace com::sun::star::drawing { struct Position3D; }
+
+namespace chart
+{
+
+class Clipping
+{
+    /** This class uses the Liang-Biarsky parametric line-clipping algorithm as described in:
+            Computer Graphics: principles and practice, 2nd ed.,
+            James D. Foley et al.,
+            Section 3.12.4 on page 117.
+    */
+
+public:
+    /** @descr  The intersection between an open polygon and a rectangle is
+            calculated and the resulting lines are placed into the poly-polygon aResult.
+        @param  rPolygon    The polygon is required to be open, ie. its start and end point
+            have different coordinates and that it is continuous, ie. has no holes.
+        @param  rRectangle  The clipping area.
+        @param  aResult The resulting lines that are the parts of the given polygon lying inside
+            the clipping area are stored into aResult whose prior content is deleted first.
+     */
+    static void clipPolygonAtRectangle(
+                                const css::drawing::PolyPolygonShape3D& rPolygon
+                                , const ::basegfx::B2DRectangle& rRectangle
+                                , css::drawing::PolyPolygonShape3D& aResult
+                                , bool bSplitPiecesToDifferentPolygons = true );
+    static void clipPolygonAtRectangle(
+                                const std::vector<std::vector<css::drawing::Position3D>>& rPolygon
+                                , const ::basegfx::B2DRectangle& rRectangle
+                                , std::vector<std::vector<css::drawing::Position3D>>& aResult
+                                , bool bSplitPiecesToDifferentPolygons = true );
+};
+
+} //namespace chart
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */