245 lines
8.4 KiB
C++
245 lines
8.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#include <sal/config.h>
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#include <cmath>
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#include <o3tl/temporary.hxx>
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#include <osl/diagnose.h>
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#include <basegfx/matrix/b2dhommatrix.hxx>
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#include <basegfx/point/b2dpoint.hxx>
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#include <basegfx/polygon/b2dpolygon.hxx>
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#include <basegfx/matrix/b2dhommatrixtools.hxx>
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#include "snakewipe.hxx"
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#include "transitiontools.hxx"
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namespace slideshow::internal {
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SnakeWipe::SnakeWipe( sal_Int32 nElements, bool diagonal, bool flipOnYAxis )
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: m_sqrtElements( static_cast<sal_Int32>(
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sqrt( static_cast<double>(nElements) ) ) ),
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m_elementEdge( 1.0 / m_sqrtElements ),
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m_diagonal(diagonal),
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m_flipOnYAxis(flipOnYAxis)
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{
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}
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::basegfx::B2DPolyPolygon SnakeWipe::calcSnake( double t ) const
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{
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::basegfx::B2DPolyPolygon res;
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const double area = t * m_sqrtElements * m_sqrtElements;
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const sal_Int32 line_ = static_cast<sal_Int32>(area) / m_sqrtElements;
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const double line = ::basegfx::pruneScaleValue(
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static_cast<double>(line_) / m_sqrtElements );
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const double col = ::basegfx::pruneScaleValue(
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(area - (line_ * m_sqrtElements)) / m_sqrtElements );
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if (! ::basegfx::fTools::equalZero( line )) {
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::basegfx::B2DPolygon poly;
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poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
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poly.append( ::basegfx::B2DPoint( 0.0, line ) );
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poly.append( ::basegfx::B2DPoint( 1.0, line ) );
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poly.append( ::basegfx::B2DPoint( 1.0, 0.0 ) );
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poly.setClosed(true);
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res.append(poly);
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}
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if (! ::basegfx::fTools::equalZero( col ))
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{
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double offset = 0.0;
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if ((line_ & 1) == 1) {
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// odd line: => right to left
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offset = (1.0 - col);
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}
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::basegfx::B2DPolygon poly;
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poly.append( ::basegfx::B2DPoint( offset, line ) );
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poly.append( ::basegfx::B2DPoint( offset,
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line + m_elementEdge ) );
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poly.append( ::basegfx::B2DPoint( offset + col,
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line + m_elementEdge ) );
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poly.append( ::basegfx::B2DPoint( offset + col, line ) );
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poly.setClosed(true);
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res.append(poly);
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}
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return res;
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}
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::basegfx::B2DPolyPolygon SnakeWipe::calcHalfDiagonalSnake(
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double t, bool in ) const
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{
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::basegfx::B2DPolyPolygon res;
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if (in) {
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const double sqrtArea2 = sqrt( t * m_sqrtElements * m_sqrtElements );
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const double edge = ::basegfx::pruneScaleValue(
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std::trunc(sqrtArea2) /
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m_sqrtElements );
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::basegfx::B2DPolygon poly;
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if (! ::basegfx::fTools::equalZero( edge )) {
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poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
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poly.append( ::basegfx::B2DPoint( 0.0, edge ) );
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poly.append( ::basegfx::B2DPoint( edge, 0.0 ) );
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poly.setClosed(true);
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res.append(poly);
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}
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const double a = M_SQRT1_2 / m_sqrtElements;
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const double d = std::modf(sqrtArea2, &o3tl::temporary(double()));
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const double len = t * M_SQRT2 * d;
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const double height = ::basegfx::pruneScaleValue( M_SQRT1_2 / m_sqrtElements );
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poly.clear();
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poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
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poly.append( ::basegfx::B2DPoint( 0.0, height ) );
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poly.append( ::basegfx::B2DPoint( len + a, height ) );
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poly.append( ::basegfx::B2DPoint( len + a, 0.0 ) );
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poly.setClosed(true);
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::basegfx::B2DHomMatrix aTransform;
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if ((static_cast<sal_Int32>(sqrtArea2) & 1) == 1)
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{
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// odd line
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aTransform = basegfx::utils::createRotateB2DHomMatrix(M_PI_2 + M_PI_4);
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aTransform.translate(edge + m_elementEdge, 0.0);
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}
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else
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{
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aTransform = basegfx::utils::createTranslateB2DHomMatrix(-a, 0.0);
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aTransform.rotate( -M_PI_4 );
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aTransform.translate( 0.0, edge );
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}
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poly.transform( aTransform );
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res.append(poly);
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}
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else // out
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{
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const double sqrtArea2 = sqrt( t * m_sqrtElements * m_sqrtElements );
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const double edge = ::basegfx::pruneScaleValue(
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std::trunc(sqrtArea2) /
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m_sqrtElements );
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::basegfx::B2DPolygon poly;
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if (! ::basegfx::fTools::equalZero( edge )) {
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poly.append( ::basegfx::B2DPoint( 0.0, 1.0 ) );
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poly.append( ::basegfx::B2DPoint( edge, 1.0 ) );
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poly.append( ::basegfx::B2DPoint( 1.0, edge ) );
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poly.append( ::basegfx::B2DPoint( 1.0, 0.0 ) );
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poly.setClosed(true);
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res.append(poly);
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}
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const double a = M_SQRT1_2 / m_sqrtElements;
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const double d = std::modf(sqrtArea2, &o3tl::temporary(double()));
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const double len = (1.0 - t) * M_SQRT2 * d;
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const double height = ::basegfx::pruneScaleValue( M_SQRT1_2 / m_sqrtElements );
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poly.clear();
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poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
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poly.append( ::basegfx::B2DPoint( 0.0, height ) );
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poly.append( ::basegfx::B2DPoint( len + a, height ) );
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poly.append( ::basegfx::B2DPoint( len + a, 0.0 ) );
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poly.setClosed(true);
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::basegfx::B2DHomMatrix aTransform;
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if ((static_cast<sal_Int32>(sqrtArea2) & 1) == 1)
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{
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// odd line
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aTransform = basegfx::utils::createTranslateB2DHomMatrix(0.0, -height);
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aTransform.rotate( M_PI_2 + M_PI_4 );
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aTransform.translate( 1.0, edge );
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}
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else
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{
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aTransform = basegfx::utils::createRotateB2DHomMatrix(-M_PI_4);
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aTransform.translate( edge, 1.0 );
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}
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poly.transform( aTransform );
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res.append(poly);
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}
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return res;
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}
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::basegfx::B2DPolyPolygon SnakeWipe::operator () ( double t )
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{
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::basegfx::B2DPolyPolygon res;
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if (m_diagonal)
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{
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if (t >= 0.5) {
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res.append( calcHalfDiagonalSnake( 1.0, true ) );
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res.append( calcHalfDiagonalSnake( 2.0 * (t - 0.5), false ) );
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}
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else
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res.append( calcHalfDiagonalSnake( 2.0 * t, true ) );
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}
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else
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res = calcSnake(t);
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if (m_flipOnYAxis)
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return flipOnYAxis(res);
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return res;
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}
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::basegfx::B2DPolyPolygon ParallelSnakesWipe::operator () ( double t )
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{
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::basegfx::B2DPolyPolygon res;
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if (m_diagonal)
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{
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OSL_ASSERT( m_opposite );
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::basegfx::B2DPolyPolygon half(
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calcHalfDiagonalSnake( t, false /* out */ ) );
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// flip on x axis and rotate 90 degrees:
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basegfx::B2DHomMatrix aTransform(basegfx::utils::createScaleB2DHomMatrix(1.0, -1.0));
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aTransform.translate( -0.5, 0.5 );
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aTransform.rotate( M_PI_2 );
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aTransform.translate( 0.5, 0.5 );
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half.transform( aTransform );
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half.flip();
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res.append( half );
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// rotate 180 degrees:
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aTransform = basegfx::utils::createTranslateB2DHomMatrix(-0.5, -0.5);
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aTransform.rotate( M_PI );
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aTransform.translate( 0.5, 0.5 );
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half.transform( aTransform );
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res.append( half );
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}
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else
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{
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::basegfx::B2DPolyPolygon half( calcSnake( t / 2.0 ) );
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// rotate 90 degrees:
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basegfx::B2DHomMatrix aTransform(basegfx::utils::createTranslateB2DHomMatrix(-0.5, -0.5));
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aTransform.rotate( M_PI_2 );
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aTransform.translate( 0.5, 0.5 );
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half.transform( aTransform );
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res.append( flipOnYAxis(half) );
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if (m_opposite)
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res.append(flipOnXAxis(half));
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else
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res.append(half);
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}
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if (m_flipOnYAxis)
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return flipOnYAxis(res);
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return res;
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}
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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