SDRAngel  4.11.5
Developer docs for <a href="https://github.com/f4exb/sdrangel">SDRangel<\a>, an Open Source Qt5 / OpenGL 3.0+ SDR and signal analyzer frontend to various hardware.
stepfunctions.h
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1 // Copyright (C) 2017 Edouard Griffiths, F4EXB //
3 // //
4 // This program is free software; you can redistribute it and/or modify //
5 // it under the terms of the GNU General Public License as published by //
6 // the Free Software Foundation as version 3 of the License, or //
7 // (at your option) any later version. //
8 // //
9 // This program is distributed in the hope that it will be useful, //
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of //
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
12 // GNU General Public License V3 for more details. //
13 // //
14 // You should have received a copy of the GNU General Public License //
15 // along with this program. If not, see <http://www.gnu.org/licenses/>. //
17 
18 #ifndef SDRBASE_UTIL_STEPFUNCTIONS_H_
19 #define SDRBASE_UTIL_STEPFUNCTIONS_H_
20 
22 {
23 public:
24  static float smootherstep(float x)
25  {
26  if (x == 1.0f) {
27  return 1.0f;
28  } else if (x == 0.0f) {
29  return 0.0f;
30  }
31 
32  double x3 = x * x * x;
33  double x4 = x * x3;
34  double x5 = x * x4;
35 
36  return (float) (6.0*x5 - 15.0*x4 + 10.0*x3);
37  }
38 };
39 
40 #endif /* SDRBASE_UTIL_STEPFUNCTIONS_H_ */
static float smootherstep(float x)
Definition: stepfunctions.h:24