Helpers.cpp

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// MIT License
//
// Copyright (c) 2022 Ian Parberry
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// IN THE SOFTWARE.
 
#include <algorithm>
#include <sstream>
 
#include "Helpers.h"
 
 
const float spline3(float t){
  return t*t*(3.0f - 2.0f*t);
} //spline3
 
 
const float spline5(float t){
  return t*t*t*(10.0f + 3.0f*t*(2.0f*t - 5.0f));
} //spline5
 
 
const float lerp(float t, float a, float b){
  return a + t*(b - a);
} //lerp
 
 
const float clamp(float a, float x, float b){
  return std::max(a, std::min(x, b));
} //clamp
 
 
std::wstring to_wstring_f(float x, size_t n){
  std::wstringstream s; //convertor
  s.precision(n); //set precision
  s << std::fixed << x; //convert x
  return s.str(); //return wstring
} //to_wstring_f
 
 
const bool isPowerOf2(size_t n){
  return n != 0 && (n & (n - 1)) == 0;
} //isPowerOf2