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 // MARKER(update_precomp.py): autogen include statement, do not remove 23 #include "precompiled_basegfx.hxx" 24 #include <basegfx/numeric/ftools.hxx> 25 #include <algorithm> 26 27 namespace basegfx 28 { 29 // init static member of class fTools 30 double ::basegfx::fTools::mfSmallValue = 0.000000001; 31 snapToNearestMultiple(double v,const double fStep)32 double snapToNearestMultiple(double v, const double fStep) 33 { 34 if(fTools::equalZero(fStep)) 35 { 36 // with a zero step, all snaps to 0.0 37 return 0.0; 38 } 39 else 40 { 41 const double fHalfStep(fStep * 0.5); 42 const double fChange(fHalfStep - fmod(v + fHalfStep, fStep)); 43 44 if(basegfx::fTools::equal(fabs(v), fabs(fChange))) 45 { 46 return 0.0; 47 } 48 else 49 { 50 return v + fChange; 51 } 52 } 53 } 54 snapToZeroRange(double v,double fWidth)55 double snapToZeroRange(double v, double fWidth) 56 { 57 if(fTools::equalZero(fWidth)) 58 { 59 // with no range all snaps to range bound 60 return 0.0; 61 } 62 else 63 { 64 if(v < 0.0 || v > fWidth) 65 { 66 double fRetval(fmod(v, fWidth)); 67 68 if(fRetval < 0.0) 69 { 70 fRetval += fWidth; 71 } 72 73 return fRetval; 74 } 75 else 76 { 77 return v; 78 } 79 } 80 } 81 snapToRange(double v,double fLow,double fHigh)82 double snapToRange(double v, double fLow, double fHigh) 83 { 84 if(fTools::equal(fLow, fHigh)) 85 { 86 // with no range all snaps to range bound 87 return 0.0; 88 } 89 else 90 { 91 if(fLow > fHigh) 92 { 93 // correct range order. Evtl. assert this (?) 94 std::swap(fLow, fHigh); 95 } 96 97 if(v < fLow || v > fHigh) 98 { 99 return snapToZeroRange(v - fLow, fHigh - fLow) + fLow; 100 } 101 else 102 { 103 return v; 104 } 105 } 106 } 107 } // end of namespace basegfx 108 109 /* vim: set noet sw=4 ts=4: */ 110