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1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /*
3 : * This file is part of the LibreOffice project.
4 : *
5 : * This Source Code Form is subject to the terms of the Mozilla Public
6 : * License, v. 2.0. If a copy of the MPL was not distributed with this
7 : * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 : *
9 : * This file incorporates work covered by the following license notice:
10 : *
11 : * Licensed to the Apache Software Foundation (ASF) under one or more
12 : * contributor license agreements. See the NOTICE file distributed
13 : * with this work for additional information regarding copyright
14 : * ownership. The ASF licenses this file to you under the Apache
15 : * License, Version 2.0 (the "License"); you may not use this file
16 : * except in compliance with the License. You may obtain a copy of
17 : * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 : */
19 :
20 :
21 : #include <canvas/debug.hxx>
22 : #include <basegfx/matrix/b2dhommatrix.hxx>
23 : #include <basegfx/point/b2dpoint.hxx>
24 : #include <basegfx/polygon/b2dpolygon.hxx>
25 : #include <basegfx/matrix/b2dhommatrixtools.hxx>
26 : #include "snakewipe.hxx"
27 : #include "transitiontools.hxx"
28 :
29 :
30 : namespace slideshow {
31 : namespace internal {
32 :
33 0 : SnakeWipe::SnakeWipe( sal_Int32 nElements, bool diagonal, bool flipOnYAxis )
34 : : m_sqrtElements( static_cast<sal_Int32>(
35 0 : sqrt( static_cast<double>(nElements) ) ) ),
36 0 : m_elementEdge( 1.0 / m_sqrtElements ),
37 : m_diagonal(diagonal),
38 0 : m_flipOnYAxis(flipOnYAxis)
39 : {
40 0 : }
41 :
42 0 : ::basegfx::B2DPolyPolygon SnakeWipe::calcSnake( double t ) const
43 : {
44 0 : ::basegfx::B2DPolyPolygon res;
45 0 : const double area = (t * m_sqrtElements * m_sqrtElements);
46 0 : const sal_Int32 line_ = (static_cast<sal_Int32>(area) / m_sqrtElements);
47 : const double line = ::basegfx::pruneScaleValue(
48 0 : static_cast<double>(line_) / m_sqrtElements );
49 : const double col = ::basegfx::pruneScaleValue(
50 0 : (area - (line_ * m_sqrtElements)) / m_sqrtElements );
51 :
52 0 : if (! ::basegfx::fTools::equalZero( line )) {
53 0 : ::basegfx::B2DPolygon poly;
54 0 : poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
55 0 : poly.append( ::basegfx::B2DPoint( 0.0, line ) );
56 0 : poly.append( ::basegfx::B2DPoint( 1.0, line ) );
57 0 : poly.append( ::basegfx::B2DPoint( 1.0, 0.0 ) );
58 0 : poly.setClosed(true);
59 0 : res.append(poly);
60 : }
61 0 : if (! ::basegfx::fTools::equalZero( col ))
62 : {
63 0 : double offset = 0.0;
64 0 : if ((line_ & 1) == 1) {
65 : // odd line: => right to left
66 0 : offset = (1.0 - col);
67 : }
68 0 : ::basegfx::B2DPolygon poly;
69 0 : poly.append( ::basegfx::B2DPoint( offset, line ) );
70 : poly.append( ::basegfx::B2DPoint( offset,
71 0 : line + m_elementEdge ) );
72 : poly.append( ::basegfx::B2DPoint( offset + col,
73 0 : line + m_elementEdge ) );
74 0 : poly.append( ::basegfx::B2DPoint( offset + col, line ) );
75 0 : poly.setClosed(true);
76 0 : res.append(poly);
77 : }
78 :
79 0 : return res;
80 : }
81 :
82 0 : ::basegfx::B2DPolyPolygon SnakeWipe::calcHalfDiagonalSnake(
83 : double t, bool in ) const
84 : {
85 0 : ::basegfx::B2DPolyPolygon res;
86 :
87 0 : if (in) {
88 0 : const double sqrtArea2 = sqrt( t * m_sqrtElements * m_sqrtElements );
89 : const double edge = ::basegfx::pruneScaleValue(
90 : static_cast<double>( static_cast<sal_Int32>(sqrtArea2) ) /
91 0 : m_sqrtElements );
92 :
93 0 : ::basegfx::B2DPolygon poly;
94 0 : if (! ::basegfx::fTools::equalZero( edge )) {
95 0 : poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
96 0 : poly.append( ::basegfx::B2DPoint( 0.0, edge ) );
97 0 : poly.append( ::basegfx::B2DPoint( edge, 0.0 ) );
98 0 : poly.setClosed(true);
99 0 : res.append(poly);
100 : }
101 0 : const double a = (M_SQRT1_2 / m_sqrtElements);
102 0 : const double d = (sqrtArea2 - static_cast<sal_Int32>(sqrtArea2));
103 0 : const double len = (t * M_SQRT2 * d);
104 0 : const double height = ::basegfx::pruneScaleValue( M_SQRT1_2 / m_sqrtElements );
105 0 : poly.clear();
106 0 : poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
107 0 : poly.append( ::basegfx::B2DPoint( 0.0, height ) );
108 0 : poly.append( ::basegfx::B2DPoint( len + a, height ) );
109 0 : poly.append( ::basegfx::B2DPoint( len + a, 0.0 ) );
110 0 : poly.setClosed(true);
111 0 : ::basegfx::B2DHomMatrix aTransform;
112 :
113 0 : if ((static_cast<sal_Int32>(sqrtArea2) & 1) == 1)
114 : {
115 : // odd line
116 0 : aTransform = basegfx::tools::createRotateB2DHomMatrix(M_PI_2 + M_PI_4);
117 0 : aTransform.translate(edge + m_elementEdge, 0.0);
118 : }
119 : else
120 : {
121 0 : aTransform = basegfx::tools::createTranslateB2DHomMatrix(-a, 0.0);
122 0 : aTransform.rotate( -M_PI_4 );
123 0 : aTransform.translate( 0.0, edge );
124 : }
125 :
126 0 : poly.transform( aTransform );
127 0 : res.append(poly);
128 : }
129 : else // out
130 : {
131 0 : const double sqrtArea2 = sqrt( t * m_sqrtElements * m_sqrtElements );
132 : const double edge = ::basegfx::pruneScaleValue(
133 : static_cast<double>( static_cast<sal_Int32>(sqrtArea2) ) /
134 0 : m_sqrtElements );
135 :
136 0 : ::basegfx::B2DPolygon poly;
137 0 : if (! ::basegfx::fTools::equalZero( edge )) {
138 0 : poly.append( ::basegfx::B2DPoint( 0.0, 1.0 ) );
139 0 : poly.append( ::basegfx::B2DPoint( edge, 1.0 ) );
140 0 : poly.append( ::basegfx::B2DPoint( 1.0, edge ) );
141 0 : poly.append( ::basegfx::B2DPoint( 1.0, 0.0 ) );
142 0 : poly.setClosed(true);
143 0 : res.append(poly);
144 : }
145 0 : const double a = (M_SQRT1_2 / m_sqrtElements);
146 0 : const double d = (sqrtArea2 - static_cast<sal_Int32>(sqrtArea2));
147 0 : const double len = ((1.0 - t) * M_SQRT2 * d);
148 0 : const double height = ::basegfx::pruneScaleValue( M_SQRT1_2 / m_sqrtElements );
149 0 : poly.clear();
150 0 : poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
151 0 : poly.append( ::basegfx::B2DPoint( 0.0, height ) );
152 0 : poly.append( ::basegfx::B2DPoint( len + a, height ) );
153 0 : poly.append( ::basegfx::B2DPoint( len + a, 0.0 ) );
154 0 : poly.setClosed(true);
155 0 : ::basegfx::B2DHomMatrix aTransform;
156 :
157 0 : if ((static_cast<sal_Int32>(sqrtArea2) & 1) == 1)
158 : {
159 : // odd line
160 0 : aTransform = basegfx::tools::createTranslateB2DHomMatrix(0.0, -height);
161 0 : aTransform.rotate( M_PI_2 + M_PI_4 );
162 0 : aTransform.translate( 1.0, edge );
163 : }
164 : else
165 : {
166 0 : aTransform = basegfx::tools::createRotateB2DHomMatrix(-M_PI_4);
167 0 : aTransform.translate( edge, 1.0 );
168 : }
169 0 : poly.transform( aTransform );
170 0 : res.append(poly);
171 : }
172 :
173 0 : return res;
174 : }
175 :
176 0 : ::basegfx::B2DPolyPolygon SnakeWipe::operator () ( double t )
177 : {
178 0 : ::basegfx::B2DPolyPolygon res;
179 0 : if (m_diagonal)
180 : {
181 0 : if (t >= 0.5) {
182 0 : res.append( calcHalfDiagonalSnake( 1.0, true ) );
183 0 : res.append( calcHalfDiagonalSnake( 2.0 * (t - 0.5), false ) );
184 : }
185 : else
186 0 : res.append( calcHalfDiagonalSnake( 2.0 * t, true ) );
187 : }
188 : else
189 0 : res = calcSnake(t);
190 :
191 0 : return m_flipOnYAxis ? flipOnYAxis(res) : res;
192 : }
193 :
194 0 : ::basegfx::B2DPolyPolygon ParallelSnakesWipe::operator () ( double t )
195 : {
196 0 : ::basegfx::B2DPolyPolygon res;
197 0 : if (m_diagonal)
198 : {
199 : OSL_ASSERT( m_opposite );
200 : ::basegfx::B2DPolyPolygon half(
201 0 : calcHalfDiagonalSnake( t, false /* out */ ) );
202 : // flip on x axis and rotate 90 degrees:
203 0 : basegfx::B2DHomMatrix aTransform(basegfx::tools::createScaleB2DHomMatrix(1.0, -1.0));
204 0 : aTransform.translate( -0.5, 0.5 );
205 0 : aTransform.rotate( M_PI_2 );
206 0 : aTransform.translate( 0.5, 0.5 );
207 0 : half.transform( aTransform );
208 0 : half.flip();
209 0 : res.append( half );
210 :
211 : // rotate 180 degrees:
212 0 : aTransform = basegfx::tools::createTranslateB2DHomMatrix(-0.5, -0.5);
213 0 : aTransform.rotate( M_PI );
214 0 : aTransform.translate( 0.5, 0.5 );
215 0 : half.transform( aTransform );
216 0 : res.append( half );
217 : }
218 : else
219 : {
220 0 : ::basegfx::B2DPolyPolygon half( calcSnake( t / 2.0 ) );
221 : // rotate 90 degrees:
222 0 : basegfx::B2DHomMatrix aTransform(basegfx::tools::createTranslateB2DHomMatrix(-0.5, -0.5));
223 0 : aTransform.rotate( M_PI_2 );
224 0 : aTransform.translate( 0.5, 0.5 );
225 0 : half.transform( aTransform );
226 0 : res.append( flipOnYAxis(half) );
227 0 : res.append( m_opposite ? flipOnXAxis(half) : half );
228 : }
229 :
230 0 : return m_flipOnYAxis ? flipOnYAxis(res) : res;
231 : }
232 :
233 : }
234 : }
235 :
236 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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