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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 <osl/diagnose.h>
22 : #include <canvas/debug.hxx>
23 : #include <basegfx/matrix/b2dhommatrix.hxx>
24 : #include <basegfx/point/b2dpoint.hxx>
25 : #include <basegfx/polygon/b2dpolygon.hxx>
26 : #include <basegfx/matrix/b2dhommatrixtools.hxx>
27 : #include "snakewipe.hxx"
28 : #include "transitiontools.hxx"
29 :
30 :
31 : namespace slideshow {
32 : namespace internal {
33 :
34 0 : SnakeWipe::SnakeWipe( sal_Int32 nElements, bool diagonal, bool flipOnYAxis )
35 : : m_sqrtElements( static_cast<sal_Int32>(
36 0 : sqrt( static_cast<double>(nElements) ) ) ),
37 0 : m_elementEdge( 1.0 / m_sqrtElements ),
38 : m_diagonal(diagonal),
39 0 : m_flipOnYAxis(flipOnYAxis)
40 : {
41 0 : }
42 :
43 0 : ::basegfx::B2DPolyPolygon SnakeWipe::calcSnake( double t ) const
44 : {
45 0 : ::basegfx::B2DPolyPolygon res;
46 0 : const double area = (t * m_sqrtElements * m_sqrtElements);
47 0 : const sal_Int32 line_ = (static_cast<sal_Int32>(area) / m_sqrtElements);
48 : const double line = ::basegfx::pruneScaleValue(
49 0 : static_cast<double>(line_) / m_sqrtElements );
50 : const double col = ::basegfx::pruneScaleValue(
51 0 : (area - (line_ * m_sqrtElements)) / m_sqrtElements );
52 :
53 0 : if (! ::basegfx::fTools::equalZero( line )) {
54 0 : ::basegfx::B2DPolygon poly;
55 0 : poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
56 0 : poly.append( ::basegfx::B2DPoint( 0.0, line ) );
57 0 : poly.append( ::basegfx::B2DPoint( 1.0, line ) );
58 0 : poly.append( ::basegfx::B2DPoint( 1.0, 0.0 ) );
59 0 : poly.setClosed(true);
60 0 : res.append(poly);
61 : }
62 0 : if (! ::basegfx::fTools::equalZero( col ))
63 : {
64 0 : double offset = 0.0;
65 0 : if ((line_ & 1) == 1) {
66 : // odd line: => right to left
67 0 : offset = (1.0 - col);
68 : }
69 0 : ::basegfx::B2DPolygon poly;
70 0 : poly.append( ::basegfx::B2DPoint( offset, line ) );
71 : poly.append( ::basegfx::B2DPoint( offset,
72 0 : line + m_elementEdge ) );
73 : poly.append( ::basegfx::B2DPoint( offset + col,
74 0 : line + m_elementEdge ) );
75 0 : poly.append( ::basegfx::B2DPoint( offset + col, line ) );
76 0 : poly.setClosed(true);
77 0 : res.append(poly);
78 : }
79 :
80 0 : return res;
81 : }
82 :
83 0 : ::basegfx::B2DPolyPolygon SnakeWipe::calcHalfDiagonalSnake(
84 : double t, bool in ) const
85 : {
86 0 : ::basegfx::B2DPolyPolygon res;
87 :
88 0 : if (in) {
89 0 : const double sqrtArea2 = sqrt( t * m_sqrtElements * m_sqrtElements );
90 : const double edge = ::basegfx::pruneScaleValue(
91 : static_cast<double>( static_cast<sal_Int32>(sqrtArea2) ) /
92 0 : m_sqrtElements );
93 :
94 0 : ::basegfx::B2DPolygon poly;
95 0 : if (! ::basegfx::fTools::equalZero( edge )) {
96 0 : poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
97 0 : poly.append( ::basegfx::B2DPoint( 0.0, edge ) );
98 0 : poly.append( ::basegfx::B2DPoint( edge, 0.0 ) );
99 0 : poly.setClosed(true);
100 0 : res.append(poly);
101 : }
102 0 : const double a = (M_SQRT1_2 / m_sqrtElements);
103 0 : const double d = (sqrtArea2 - static_cast<sal_Int32>(sqrtArea2));
104 0 : const double len = (t * M_SQRT2 * d);
105 0 : const double height = ::basegfx::pruneScaleValue( M_SQRT1_2 / m_sqrtElements );
106 0 : poly.clear();
107 0 : poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
108 0 : poly.append( ::basegfx::B2DPoint( 0.0, height ) );
109 0 : poly.append( ::basegfx::B2DPoint( len + a, height ) );
110 0 : poly.append( ::basegfx::B2DPoint( len + a, 0.0 ) );
111 0 : poly.setClosed(true);
112 0 : ::basegfx::B2DHomMatrix aTransform;
113 :
114 0 : if ((static_cast<sal_Int32>(sqrtArea2) & 1) == 1)
115 : {
116 : // odd line
117 0 : aTransform = basegfx::tools::createRotateB2DHomMatrix(M_PI_2 + M_PI_4);
118 0 : aTransform.translate(edge + m_elementEdge, 0.0);
119 : }
120 : else
121 : {
122 0 : aTransform = basegfx::tools::createTranslateB2DHomMatrix(-a, 0.0);
123 0 : aTransform.rotate( -M_PI_4 );
124 0 : aTransform.translate( 0.0, edge );
125 : }
126 :
127 0 : poly.transform( aTransform );
128 0 : res.append(poly);
129 : }
130 : else // out
131 : {
132 0 : const double sqrtArea2 = sqrt( t * m_sqrtElements * m_sqrtElements );
133 : const double edge = ::basegfx::pruneScaleValue(
134 : static_cast<double>( static_cast<sal_Int32>(sqrtArea2) ) /
135 0 : m_sqrtElements );
136 :
137 0 : ::basegfx::B2DPolygon poly;
138 0 : if (! ::basegfx::fTools::equalZero( edge )) {
139 0 : poly.append( ::basegfx::B2DPoint( 0.0, 1.0 ) );
140 0 : poly.append( ::basegfx::B2DPoint( edge, 1.0 ) );
141 0 : poly.append( ::basegfx::B2DPoint( 1.0, edge ) );
142 0 : poly.append( ::basegfx::B2DPoint( 1.0, 0.0 ) );
143 0 : poly.setClosed(true);
144 0 : res.append(poly);
145 : }
146 0 : const double a = (M_SQRT1_2 / m_sqrtElements);
147 0 : const double d = (sqrtArea2 - static_cast<sal_Int32>(sqrtArea2));
148 0 : const double len = ((1.0 - t) * M_SQRT2 * d);
149 0 : const double height = ::basegfx::pruneScaleValue( M_SQRT1_2 / m_sqrtElements );
150 0 : poly.clear();
151 0 : poly.append( ::basegfx::B2DPoint( 0.0, 0.0 ) );
152 0 : poly.append( ::basegfx::B2DPoint( 0.0, height ) );
153 0 : poly.append( ::basegfx::B2DPoint( len + a, height ) );
154 0 : poly.append( ::basegfx::B2DPoint( len + a, 0.0 ) );
155 0 : poly.setClosed(true);
156 0 : ::basegfx::B2DHomMatrix aTransform;
157 :
158 0 : if ((static_cast<sal_Int32>(sqrtArea2) & 1) == 1)
159 : {
160 : // odd line
161 0 : aTransform = basegfx::tools::createTranslateB2DHomMatrix(0.0, -height);
162 0 : aTransform.rotate( M_PI_2 + M_PI_4 );
163 0 : aTransform.translate( 1.0, edge );
164 : }
165 : else
166 : {
167 0 : aTransform = basegfx::tools::createRotateB2DHomMatrix(-M_PI_4);
168 0 : aTransform.translate( edge, 1.0 );
169 : }
170 0 : poly.transform( aTransform );
171 0 : res.append(poly);
172 : }
173 :
174 0 : return res;
175 : }
176 :
177 0 : ::basegfx::B2DPolyPolygon SnakeWipe::operator () ( double t )
178 : {
179 0 : ::basegfx::B2DPolyPolygon res;
180 0 : if (m_diagonal)
181 : {
182 0 : if (t >= 0.5) {
183 0 : res.append( calcHalfDiagonalSnake( 1.0, true ) );
184 0 : res.append( calcHalfDiagonalSnake( 2.0 * (t - 0.5), false ) );
185 : }
186 : else
187 0 : res.append( calcHalfDiagonalSnake( 2.0 * t, true ) );
188 : }
189 : else
190 0 : res = calcSnake(t);
191 :
192 0 : return m_flipOnYAxis ? flipOnYAxis(res) : res;
193 : }
194 :
195 0 : ::basegfx::B2DPolyPolygon ParallelSnakesWipe::operator () ( double t )
196 : {
197 0 : ::basegfx::B2DPolyPolygon res;
198 0 : if (m_diagonal)
199 : {
200 : OSL_ASSERT( m_opposite );
201 : ::basegfx::B2DPolyPolygon half(
202 0 : calcHalfDiagonalSnake( t, false /* out */ ) );
203 : // flip on x axis and rotate 90 degrees:
204 0 : basegfx::B2DHomMatrix aTransform(basegfx::tools::createScaleB2DHomMatrix(1.0, -1.0));
205 0 : aTransform.translate( -0.5, 0.5 );
206 0 : aTransform.rotate( M_PI_2 );
207 0 : aTransform.translate( 0.5, 0.5 );
208 0 : half.transform( aTransform );
209 0 : half.flip();
210 0 : res.append( half );
211 :
212 : // rotate 180 degrees:
213 0 : aTransform = basegfx::tools::createTranslateB2DHomMatrix(-0.5, -0.5);
214 0 : aTransform.rotate( M_PI );
215 0 : aTransform.translate( 0.5, 0.5 );
216 0 : half.transform( aTransform );
217 0 : res.append( half );
218 : }
219 : else
220 : {
221 0 : ::basegfx::B2DPolyPolygon half( calcSnake( t / 2.0 ) );
222 : // rotate 90 degrees:
223 0 : basegfx::B2DHomMatrix aTransform(basegfx::tools::createTranslateB2DHomMatrix(-0.5, -0.5));
224 0 : aTransform.rotate( M_PI_2 );
225 0 : aTransform.translate( 0.5, 0.5 );
226 0 : half.transform( aTransform );
227 0 : res.append( flipOnYAxis(half) );
228 0 : res.append( m_opposite ? flipOnXAxis(half) : half );
229 : }
230 :
231 0 : return m_flipOnYAxis ? flipOnYAxis(res) : res;
232 : }
233 :
234 : }
235 : }
236 :
237 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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