| /************************************************************** |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| *************************************************************/ |
| |
| |
| |
| // MARKER(update_precomp.py): autogen include statement, do not remove |
| #include "precompiled_basegfx.hxx" |
| #include <basegfx/numeric/ftools.hxx> |
| #include <algorithm> |
| |
| namespace basegfx |
| { |
| // init static member of class fTools |
| double ::basegfx::fTools::mfSmallValue = 0.000000001; |
| |
| double snapToNearestMultiple(double v, const double fStep) |
| { |
| if(fTools::equalZero(fStep)) |
| { |
| // with a zero step, all snaps to 0.0 |
| return 0.0; |
| } |
| else |
| { |
| const double fHalfStep(fStep * 0.5); |
| const double fChange(fHalfStep - fmod(v + fHalfStep, fStep)); |
| |
| if(basegfx::fTools::equal(fabs(v), fabs(fChange))) |
| { |
| return 0.0; |
| } |
| else |
| { |
| return v + fChange; |
| } |
| } |
| } |
| |
| double snapToZeroRange(double v, double fWidth) |
| { |
| if(fTools::equalZero(fWidth)) |
| { |
| // with no range all snaps to range bound |
| return 0.0; |
| } |
| else |
| { |
| if(v < 0.0 || v > fWidth) |
| { |
| double fRetval(fmod(v, fWidth)); |
| |
| if(fRetval < 0.0) |
| { |
| fRetval += fWidth; |
| } |
| |
| return fRetval; |
| } |
| else |
| { |
| return v; |
| } |
| } |
| } |
| |
| double snapToRange(double v, double fLow, double fHigh) |
| { |
| if(fTools::equal(fLow, fHigh)) |
| { |
| // with no range all snaps to range bound |
| return 0.0; |
| } |
| else |
| { |
| if(fLow > fHigh) |
| { |
| // correct range order. Evtl. assert this (?) |
| std::swap(fLow, fHigh); |
| } |
| |
| if(v < fLow || v > fHigh) |
| { |
| return snapToZeroRange(v - fLow, fHigh - fLow) + fLow; |
| } |
| else |
| { |
| return v; |
| } |
| } |
| } |
| } // end of namespace basegfx |
| |
| // eof |
