tools & vcl: move OutputDevice::ImplRotatePos() to Point::RotateAbout()

OutputDevice has a private function that rotates a point around another
point. However, there is no real reason why OutputDevice should be
responsible for this - it's really the responsibility of the Point
class in the tools module. Therefore, I've moved this functionality out
of OutputDevice and into Point, but I've renamed it from the rather
confusing name "ImplRotatePos" to "RotateAround", which is what it
actually does.

Change-Id: If12fb40a7b476653224d4edfc01887bc91a80c7d
Reviewed-on: https://gerrit.libreoffice.org/12171
Reviewed-by: Chris Sherlock <chris.sherlock79@gmail.com>
Tested-by: Chris Sherlock <chris.sherlock79@gmail.com>

2 files changed, 80 insertions, 0 deletions

diff --git a/tools/Library_tl.mk b/tools/Library_tl.mk
index 856471bbf7ba..d399548cd874 100644
--- a/tools/Library_tl.mk
+++ b/tools/Library_tl.mk
@@ -59,6 +59,7 @@ $(eval $(call gb_Library_add_exception_objects,tl,\
     tools/source/generic/gen \
     tools/source/generic/line \
     tools/source/generic/link \
+    tools/source/generic/point \
     tools/source/generic/poly \
     tools/source/generic/poly2 \
     tools/source/generic/svborder \
diff --git a/tools/source/generic/point.cxx b/tools/source/generic/point.cxx
new file mode 100644
index 000000000000..7feaef6a2083
--- /dev/null
+++ b/tools/source/generic/point.cxx
@@ -0,0 +1,79 @@
+/* -*- 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 <numeric>
+
+#include <tools/gen.hxx>
+#include <basegfx/numeric/ftools.hxx>
+
+void Point::RotateAround( long& rX, long& rY,
+                          short nOrientation ) const
+{
+    const long nOriginX = X();
+    const long nOriginY = Y();
+
+    if ( (nOrientation >= 0) && !(nOrientation % 900) )
+    {
+        if ( (nOrientation >= 3600) )
+            nOrientation %= 3600;
+
+        if ( nOrientation )
+        {
+            rX -= nOriginX;
+            rY -= nOriginY;
+
+            if ( nOrientation == 900 )
+            {
+                long nTemp = rX;
+                rX = rY;
+                rY = -nTemp;
+            }
+            else if ( nOrientation == 1800 )
+            {
+                rX = -rX;
+                rY = -rY;
+            }
+            else /* ( nOrientation == 2700 ) */
+            {
+                long nTemp = rX;
+                rX = -rY;
+                rY = nTemp;
+            }
+
+            rX += nOriginX;
+            rY += nOriginY;
+        }
+    }
+    else
+    {
+        double nRealOrientation = nOrientation*F_PI1800;
+        double nCos = cos( nRealOrientation );
+        double nSin = sin( nRealOrientation );
+
+        // Translation...
+        long nX = rX-nOriginX;
+        long nY = rY-nOriginY;
+
+        // Rotation...
+        rX = +((long)(nCos*nX + nSin*nY)) + nOriginX;
+        rY = -((long)(nSin*nX - nCos*nY)) + nOriginY;
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */