From ed5640d8b587fbcfed7dd7967f3de04b37a76f26 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 11:06:44 +0200
Subject: Adding upstream version 4:7.4.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 slideshow/source/engine/transitions/spiralwipe.cxx | 120 +++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 slideshow/source/engine/transitions/spiralwipe.cxx

(limited to 'slideshow/source/engine/transitions/spiralwipe.cxx')

diff --git a/slideshow/source/engine/transitions/spiralwipe.cxx b/slideshow/source/engine/transitions/spiralwipe.cxx
new file mode 100644
index 000000000..3d1dc0282
--- /dev/null
+++ b/slideshow/source/engine/transitions/spiralwipe.cxx
@@ -0,0 +1,120 @@
+/* -*- 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 "spiralwipe.hxx"
+#include "transitiontools.hxx"
+
+#include <basegfx/matrix/b2dhommatrix.hxx>
+#include <basegfx/polygon/b2dpolygon.hxx>
+#include <basegfx/numeric/ftools.hxx>
+#include <basegfx/matrix/b2dhommatrixtools.hxx>
+
+
+namespace slideshow::internal {
+
+SpiralWipe::SpiralWipe( sal_Int32 nElements, bool flipOnYAxis )
+    : m_elements(nElements),
+      m_sqrtElements( static_cast<sal_Int32>(
+                          sqrt( static_cast<double>(nElements) ) ) ),
+      m_flipOnYAxis(flipOnYAxis)
+{
+}
+
+::basegfx::B2DPolyPolygon SpiralWipe::calcNegSpiral( double t ) const
+{
+    const double area = t * m_elements;
+    const double e = sqrt(area) / 2.0;
+    const sal_Int32 edge = static_cast<sal_Int32>(e) * 2;
+
+    basegfx::B2DHomMatrix aTransform(basegfx::utils::createTranslateB2DHomMatrix(-0.5, -0.5));
+    const double edge_ = ::basegfx::pruneScaleValue(
+        static_cast<double>(edge) / m_sqrtElements );
+    aTransform.scale( edge_, edge_ );
+    aTransform.translate( 0.5, 0.5 );
+    ::basegfx::B2DPolygon poly( createUnitRect() );
+    poly.transform( aTransform );
+    ::basegfx::B2DPolyPolygon res(poly);
+
+    if (! ::basegfx::fTools::equalZero( 1.0 - t )) {
+        const sal_Int32 edge1 = edge + 1;
+        sal_Int32 len = static_cast<sal_Int32>( (e - (edge /2)) * edge1 * 4 );
+        double w = M_PI_2;
+        while (len > 0) {
+            const sal_Int32 alen = std::min(len, edge1);
+            len -= alen;
+            poly = createUnitRect();
+            aTransform = basegfx::utils::createScaleB2DHomMatrix(
+                ::basegfx::pruneScaleValue( static_cast<double>(alen) / m_sqrtElements ),
+                ::basegfx::pruneScaleValue( 1.0 / m_sqrtElements ) );
+            aTransform.translate(
+                - ::basegfx::pruneScaleValue(
+                    static_cast<double>(edge / 2) / m_sqrtElements ),
+                ::basegfx::pruneScaleValue(
+                    static_cast<double>(edge / 2) / m_sqrtElements ) );
+            aTransform.rotate( w );
+            w -= M_PI_2;
+            aTransform.translate( 0.5, 0.5 );
+            poly.transform( aTransform );
+            res.append(poly);
+        }
+    }
+
+    return res;
+}
+
+::basegfx::B2DPolyPolygon SpiralWipe::operator () ( double t )
+{
+    ::basegfx::B2DPolyPolygon res( createUnitRect() );
+    ::basegfx::B2DPolyPolygon innerSpiral( calcNegSpiral( 1.0 - t ) );
+    innerSpiral.flip();
+    res.append(innerSpiral);
+    return m_flipOnYAxis ? flipOnYAxis(res) : res;
+}
+
+::basegfx::B2DPolyPolygon BoxSnakesWipe::operator () ( double t )
+{
+    ::basegfx::B2DPolyPolygon res( createUnitRect() );
+    ::basegfx::B2DPolyPolygon innerSpiral( calcNegSpiral( 1.0 - t ) );
+    innerSpiral.flip();
+
+    if (m_fourBox) {
+        ::basegfx::B2DHomMatrix aTransform;
+        aTransform.scale( 0.5, 0.5 );
+        innerSpiral.transform( aTransform );
+        res.append(innerSpiral);
+        res.append( flipOnXAxis(innerSpiral) );
+        innerSpiral = flipOnYAxis(innerSpiral);
+        res.append(innerSpiral);
+        res.append( flipOnXAxis(innerSpiral) );
+    }
+    else {
+        ::basegfx::B2DHomMatrix aTransform;
+        aTransform.scale( 1.0, 0.5 );
+        innerSpiral.transform( aTransform );
+        res.append(innerSpiral);
+        res.append( flipOnXAxis(innerSpiral) );
+    }
+
+    return m_flipOnYAxis ? flipOnYAxis(res) : res;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
-- 
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