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 #ifndef _CHART2_CLIPPING_HXX 25 #define _CHART2_CLIPPING_HXX 26 27 #include <basegfx/range/b2drectangle.hxx> 28 #include <com/sun/star/drawing/PolyPolygonShape3D.hpp> 29 30 //............................................................................. 31 namespace chart 32 { 33 //............................................................................. 34 35 //----------------------------------------------------------------------------- 36 /** 37 */ 38 39 class Clipping 40 { 41 /** This class uses the Liang-Biarsky parametric line-clipping algorithm as described in: 42 Computer Graphics: principles and practice, 2nd ed., 43 James D. Foley et al., 44 Section 3.12.4 on page 117. 45 */ 46 47 public: 48 /** @descr The intersection between an open polygon and a rectangle is 49 calculated and the resulting lines are placed into the poly-polygon aResult. 50 @param rPolygon The polygon is required to be open, ie. it's start and end point 51 have different coordinates and that it is continuous, ie. has no holes. 52 @param rRectangle The clipping area. 53 @param aResult The resulting lines that are the parts of the given polygon lying inside 54 the clipping area are stored into aResult whose prior content is deleted first. 55 */ 56 static void clipPolygonAtRectangle( 57 const ::com::sun::star::drawing::PolyPolygonShape3D& rPolygon 58 , const ::basegfx::B2DRectangle& rRectangle 59 , ::com::sun::star::drawing::PolyPolygonShape3D& aResult 60 , bool bSplitPiecesToDifferentPolygons = true ); 61 }; 62 63 //............................................................................. 64 } //namespace chart 65 //............................................................................. 66 #endif 67