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_basegfx.hxx" 26 #include <basegfx/numeric/ftools.hxx> 27 #include <algorithm> 28 29 namespace basegfx 30 { 31 // init static member of class fTools 32 double ::basegfx::fTools::mfSmallValue = 0.000000001; 33 34 double snapToNearestMultiple(double v, const double fStep) 35 { 36 if(fTools::equalZero(fStep)) 37 { 38 // with a zero step, all snaps to 0.0 39 return 0.0; 40 } 41 else 42 { 43 const double fHalfStep(fStep * 0.5); 44 const double fChange(fHalfStep - fmod(v + fHalfStep, fStep)); 45 46 if(basegfx::fTools::equal(fabs(v), fabs(fChange))) 47 { 48 return 0.0; 49 } 50 else 51 { 52 return v + fChange; 53 } 54 } 55 } 56 57 double snapToZeroRange(double v, double fWidth) 58 { 59 if(fTools::equalZero(fWidth)) 60 { 61 // with no range all snaps to range bound 62 return 0.0; 63 } 64 else 65 { 66 if(v < 0.0 || v > fWidth) 67 { 68 double fRetval(fmod(v, fWidth)); 69 70 if(fRetval < 0.0) 71 { 72 fRetval += fWidth; 73 } 74 75 return fRetval; 76 } 77 else 78 { 79 return v; 80 } 81 } 82 } 83 84 double snapToRange(double v, double fLow, double fHigh) 85 { 86 if(fTools::equal(fLow, fHigh)) 87 { 88 // with no range all snaps to range bound 89 return 0.0; 90 } 91 else 92 { 93 if(fLow > fHigh) 94 { 95 // correct range order. Evtl. assert this (?) 96 std::swap(fLow, fHigh); 97 } 98 99 if(v < fLow || v > fHigh) 100 { 101 return snapToZeroRange(v - fLow, fHigh - fLow) + fLow; 102 } 103 else 104 { 105 return v; 106 } 107 } 108 } 109 } // end of namespace basegfx 110 111 // eof 112