1 /************************************************************** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * 20 *************************************************************/ 21 22 23 24 // MARKER(update_precomp.py): autogen include statement, do not remove 25 #include "precompiled_slideshow.hxx" 26 27 #include <canvas/debug.hxx> 28 #include <basegfx/matrix/b2dhommatrix.hxx> 29 #include <basegfx/numeric/ftools.hxx> 30 #include <basegfx/matrix/b2dhommatrixtools.hxx> 31 #include "randomwipe.hxx" 32 #include "tools.hxx" 33 34 35 namespace slideshow { 36 namespace internal { 37 38 RandomWipe::RandomWipe( sal_Int32 nElements, bool randomBars ) 39 : m_positions( new ::basegfx::B2DPoint[ nElements ] ), 40 m_nElements( nElements ), 41 m_rect( createUnitRect() ) 42 { 43 ::basegfx::B2DHomMatrix aTransform; 44 if (randomBars) 45 { 46 double edge = (1.0 / nElements); 47 for ( sal_Int32 pos = nElements; pos--; ) 48 m_positions[ pos ].setY( ::basegfx::pruneScaleValue( pos * edge ) ); 49 aTransform.scale( 1.0, ::basegfx::pruneScaleValue(edge) ); 50 } 51 else // dissolve effect 52 { 53 sal_Int32 sqrtElements = static_cast<sal_Int32>( 54 sqrt( static_cast<double>(nElements) ) ); 55 double edge = (1.0 / sqrtElements); 56 for ( sal_Int32 pos = nElements; pos--; ) { 57 m_positions[ pos ] = ::basegfx::B2DPoint( 58 ::basegfx::pruneScaleValue( (pos % sqrtElements) * edge ), 59 ::basegfx::pruneScaleValue( (pos / sqrtElements) * edge ) ); 60 } 61 const double pedge = ::basegfx::pruneScaleValue(edge); 62 aTransform.scale( pedge, pedge ); 63 } 64 m_rect.transform( aTransform ); 65 66 // mix up: 67 for (sal_Int32 nIndex=0; nIndex<nElements; ++nIndex) 68 { 69 const sal_Int32 nOtherIndex (getRandomOrdinal(nElements)); 70 OSL_ASSERT(nOtherIndex>=0 && nOtherIndex<nElements); 71 ::std::swap(m_positions[nIndex], m_positions[nOtherIndex]); 72 } 73 } 74 75 ::basegfx::B2DPolyPolygon RandomWipe::operator () ( double t ) 76 { 77 ::basegfx::B2DPolyPolygon res; 78 for ( sal_Int32 pos = static_cast<sal_Int32>(t * m_nElements); pos--; ) 79 { 80 ::basegfx::B2DPoint const & point = m_positions[ pos ]; 81 ::basegfx::B2DPolygon poly( m_rect ); 82 poly.transform(basegfx::tools::createTranslateB2DHomMatrix(point.getX(), point.getY())); 83 res.append( poly ); 84 } 85 return res; 86 } 87 88 } 89 } 90