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/* -*- 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 <sal/config.h>
#include <cmath>
#include <o3tl/temporary.hxx>
#include <osl/diagnose.h>
#include <basegfx/matrix/b2dhommatrix.hxx>
#include <basegfx/point/b2dpoint.hxx>
#include <basegfx/polygon/b2dpolygon.hxx>
#include <basegfx/matrix/b2dhommatrixtools.hxx>
#include "snakewipe.hxx"
#include "transitiontools.hxx"
namespace slideshow::internal {
SnakeWipe::SnakeWipe( sal_Int32 nElements, bool diagonal, bool flipOnYAxis )
: m_sqrtElements( static_cast<sal_Int32>(
sqrt( static_cast<double>(nElements) ) ) ),
m_elementEdge( 1.0 / m_sqrtElements ),
m_diagonal(diagonal),
m_flipOnYAxis(flipOnYAxis)
{
}
::basegfx::B2DPolyPolygon SnakeWipe::calcSnake( double t ) const
{
::basegfx::B2DPolyPolygon res;
const double area = t * m_sqrtElements * m_sqrtElements;
const sal_Int32 line_ = static_cast<sal_Int32>(area) / m_sqrtElements;
const double line = ::basegfx::pruneScaleValue(
static_cast<double>(line_) / m_sqrtElements );
const double col = ::basegfx::pruneScaleValue(
(area - (line_ * m_sqrtElements)) / m_sqrtElements );
if (! ::basegfx::fTools::equalZero( line )) {
::basegfx::B2DPolygon poly;
poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
poly.append( ::basegfx::B2DPoint( 0.0, line ) );
poly.append( ::basegfx::B2DPoint( 1.0, line ) );
poly.append( ::basegfx::B2DPoint( 1.0, 0.0 ) );
poly.setClosed(true);
res.append(poly);
}
if (! ::basegfx::fTools::equalZero( col ))
{
double offset = 0.0;
if ((line_ & 1) == 1) {
// odd line: => right to left
offset = (1.0 - col);
}
::basegfx::B2DPolygon poly;
poly.append( ::basegfx::B2DPoint( offset, line ) );
poly.append( ::basegfx::B2DPoint( offset,
line + m_elementEdge ) );
poly.append( ::basegfx::B2DPoint( offset + col,
line + m_elementEdge ) );
poly.append( ::basegfx::B2DPoint( offset + col, line ) );
poly.setClosed(true);
res.append(poly);
}
return res;
}
::basegfx::B2DPolyPolygon SnakeWipe::calcHalfDiagonalSnake(
double t, bool in ) const
{
::basegfx::B2DPolyPolygon res;
if (in) {
const double sqrtArea2 = sqrt( t * m_sqrtElements * m_sqrtElements );
const double edge = ::basegfx::pruneScaleValue(
std::trunc(sqrtArea2) /
m_sqrtElements );
::basegfx::B2DPolygon poly;
if (! ::basegfx::fTools::equalZero( edge )) {
poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
poly.append( ::basegfx::B2DPoint( 0.0, edge ) );
poly.append( ::basegfx::B2DPoint( edge, 0.0 ) );
poly.setClosed(true);
res.append(poly);
}
const double a = M_SQRT1_2 / m_sqrtElements;
const double d = std::modf(sqrtArea2, &o3tl::temporary(double()));
const double len = t * M_SQRT2 * d;
const double height = ::basegfx::pruneScaleValue( M_SQRT1_2 / m_sqrtElements );
poly.clear();
poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
poly.append( ::basegfx::B2DPoint( 0.0, height ) );
poly.append( ::basegfx::B2DPoint( len + a, height ) );
poly.append( ::basegfx::B2DPoint( len + a, 0.0 ) );
poly.setClosed(true);
::basegfx::B2DHomMatrix aTransform;
if ((static_cast<sal_Int32>(sqrtArea2) & 1) == 1)
{
// odd line
aTransform = basegfx::utils::createRotateB2DHomMatrix(M_PI_2 + M_PI_4);
aTransform.translate(edge + m_elementEdge, 0.0);
}
else
{
aTransform = basegfx::utils::createTranslateB2DHomMatrix(-a, 0.0);
aTransform.rotate( -M_PI_4 );
aTransform.translate( 0.0, edge );
}
poly.transform( aTransform );
res.append(poly);
}
else // out
{
const double sqrtArea2 = sqrt( t * m_sqrtElements * m_sqrtElements );
const double edge = ::basegfx::pruneScaleValue(
std::trunc(sqrtArea2) /
m_sqrtElements );
::basegfx::B2DPolygon poly;
if (! ::basegfx::fTools::equalZero( edge )) {
poly.append( ::basegfx::B2DPoint( 0.0, 1.0 ) );
poly.append( ::basegfx::B2DPoint( edge, 1.0 ) );
poly.append( ::basegfx::B2DPoint( 1.0, edge ) );
poly.append( ::basegfx::B2DPoint( 1.0, 0.0 ) );
poly.setClosed(true);
res.append(poly);
}
const double a = M_SQRT1_2 / m_sqrtElements;
const double d = std::modf(sqrtArea2, &o3tl::temporary(double()));
const double len = (1.0 - t) * M_SQRT2 * d;
const double height = ::basegfx::pruneScaleValue( M_SQRT1_2 / m_sqrtElements );
poly.clear();
poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
poly.append( ::basegfx::B2DPoint( 0.0, height ) );
poly.append( ::basegfx::B2DPoint( len + a, height ) );
poly.append( ::basegfx::B2DPoint( len + a, 0.0 ) );
poly.setClosed(true);
::basegfx::B2DHomMatrix aTransform;
if ((static_cast<sal_Int32>(sqrtArea2) & 1) == 1)
{
// odd line
aTransform = basegfx::utils::createTranslateB2DHomMatrix(0.0, -height);
aTransform.rotate( M_PI_2 + M_PI_4 );
aTransform.translate( 1.0, edge );
}
else
{
aTransform = basegfx::utils::createRotateB2DHomMatrix(-M_PI_4);
aTransform.translate( edge, 1.0 );
}
poly.transform( aTransform );
res.append(poly);
}
return res;
}
::basegfx::B2DPolyPolygon SnakeWipe::operator () ( double t )
{
::basegfx::B2DPolyPolygon res;
if (m_diagonal)
{
if (t >= 0.5) {
res.append( calcHalfDiagonalSnake( 1.0, true ) );
res.append( calcHalfDiagonalSnake( 2.0 * (t - 0.5), false ) );
}
else
res.append( calcHalfDiagonalSnake( 2.0 * t, true ) );
}
else
res = calcSnake(t);
return m_flipOnYAxis ? flipOnYAxis(res) : res;
}
::basegfx::B2DPolyPolygon ParallelSnakesWipe::operator () ( double t )
{
::basegfx::B2DPolyPolygon res;
if (m_diagonal)
{
OSL_ASSERT( m_opposite );
::basegfx::B2DPolyPolygon half(
calcHalfDiagonalSnake( t, false /* out */ ) );
// flip on x axis and rotate 90 degrees:
basegfx::B2DHomMatrix aTransform(basegfx::utils::createScaleB2DHomMatrix(1.0, -1.0));
aTransform.translate( -0.5, 0.5 );
aTransform.rotate( M_PI_2 );
aTransform.translate( 0.5, 0.5 );
half.transform( aTransform );
half.flip();
res.append( half );
// rotate 180 degrees:
aTransform = basegfx::utils::createTranslateB2DHomMatrix(-0.5, -0.5);
aTransform.rotate( M_PI );
aTransform.translate( 0.5, 0.5 );
half.transform( aTransform );
res.append( half );
}
else
{
::basegfx::B2DPolyPolygon half( calcSnake( t / 2.0 ) );
// rotate 90 degrees:
basegfx::B2DHomMatrix aTransform(basegfx::utils::createTranslateB2DHomMatrix(-0.5, -0.5));
aTransform.rotate( M_PI_2 );
aTransform.translate( 0.5, 0.5 );
half.transform( aTransform );
res.append( flipOnYAxis(half) );
res.append( m_opposite ? flipOnXAxis(half) : half );
}
return m_flipOnYAxis ? flipOnYAxis(res) : res;
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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