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/point/b2dpoint.hxx> 30 #include "doublediamondwipe.hxx" 31 32 33 namespace slideshow { 34 namespace internal { 35 36 ::basegfx::B2DPolyPolygon DoubleDiamondWipe::operator () ( double t ) 37 { 38 // outer: 39 const double a = ::basegfx::pruneScaleValue( 0.25 + (t * 0.75) ); 40 ::basegfx::B2DPolygon poly; 41 poly.append( ::basegfx::B2DPoint( 0.5 + a, 0.5 ) ); 42 poly.append( ::basegfx::B2DPoint( 0.5, 0.5 - a ) ); 43 poly.append( ::basegfx::B2DPoint( 0.5 - a, 0.5 ) ); 44 poly.append( ::basegfx::B2DPoint( 0.5, 0.5 + a ) ); 45 poly.setClosed(true); 46 ::basegfx::B2DPolyPolygon res(poly); 47 48 // inner (reverse order to clip): 49 const double b = ::basegfx::pruneScaleValue( (1.0 - t) * 0.25 ); 50 poly.clear(); 51 poly.append( ::basegfx::B2DPoint( 0.5 + b, 0.5 ) ); 52 poly.append( ::basegfx::B2DPoint( 0.5, 0.5 + b ) ); 53 poly.append( ::basegfx::B2DPoint( 0.5 - b, 0.5 ) ); 54 poly.append( ::basegfx::B2DPoint( 0.5, 0.5 - b ) ); 55 poly.setClosed(true); 56 res.append(poly); 57 58 return res; 59 } 60 61 } 62 } 63