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<div class="title">qwt_math.h</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/******************************************************************************</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Qwt Widget Library</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Copyright (C) 1997 Josef Wilgen</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * Copyright (C) 2002 Uwe Rathmann</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * This library is free software; you can redistribute it and/or</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * modify it under the terms of the Qwt License, Version 1.0</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> *****************************************************************************/</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>  </div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="preprocessor">#ifndef QWT_MATH_H</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#define QWT_MATH_H</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>  </div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include "qwt_global.h"</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>  </div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">/*</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> Microsoft says:</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"></span> </div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> Define _USE_MATH_DEFINES before including math.h to expose these macro</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> definitions for common math constants. These are placed under an #ifdef</span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> since these commonly-defined names are not part of the C/C++ standards.</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> */</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>  </div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#ifndef _USE_MATH_DEFINES</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#define _USE_MATH_DEFINES</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#define undef_USE_MATH_DEFINES</span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  </div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include <cmath></span></div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  </div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#ifdef undef_USE_MATH_DEFINES</span></div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#undef _USE_MATH_DEFINES</span></div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#undef undef_USE_MATH_DEFINES</span></div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  </div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="preprocessor">#ifndef M_E</span></div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor">#define M_E ( 2.7182818284590452354 )</span></div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  </div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="preprocessor">#ifndef M_LOG2E</span></div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor">#define M_LOG2E ( 1.4426950408889634074 )</span></div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  </div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="preprocessor">#ifndef M_LOG10E</span></div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="preprocessor">#define M_LOG10E ( 0.43429448190325182765 )</span></div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  </div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="preprocessor">#ifndef M_LN2</span></div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor">#define M_LN2 ( 0.69314718055994530942 )</span></div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  </div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="preprocessor">#ifndef M_LN10</span></div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="preprocessor">#define M_LN10 ( 2.30258509299404568402 )</span></div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  </div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="preprocessor">#ifndef M_PI</span></div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="preprocessor">#define M_PI ( 3.14159265358979323846 )</span></div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  </div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="preprocessor">#ifndef M_PI_2</span></div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="preprocessor">#define M_PI_2 ( 1.57079632679489661923 )</span></div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  </div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="preprocessor">#ifndef M_PI_4</span></div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="preprocessor">#define M_PI_4 ( 0.78539816339744830962 )</span></div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  </div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="preprocessor">#ifndef M_1_PI</span></div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="preprocessor">#define M_1_PI ( 0.31830988618379067154 )</span></div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  </div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="preprocessor">#ifndef M_2_PI</span></div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="preprocessor">#define M_2_PI ( 0.63661977236758134308 )</span></div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  </div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="preprocessor">#ifndef M_2_SQRTPI</span></div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="preprocessor">#define M_2_SQRTPI ( 1.12837916709551257390 )</span></div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  </div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="preprocessor">#ifndef M_SQRT2</span></div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="preprocessor">#define M_SQRT2 ( 1.41421356237309504880 )</span></div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  </div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="preprocessor">#ifndef M_SQRT1_2</span></div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="preprocessor">#define M_SQRT1_2 ( 0.70710678118654752440 )</span></div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  </div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="preprocessor">#if defined( QT_WARNING_PUSH )</span></div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="comment">/*</span></div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="comment"> early Qt versions not having QT_WARNING_PUSH is full of warnings</span></div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="comment"> so that we do not care of suppressing those from below</span></div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="comment"> */</span></div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  QT_WARNING_PUSH</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  QT_WARNING_DISABLE_CLANG(<span class="stringliteral">"-Wdouble-promotion"</span>)</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  QT_WARNING_DISABLE_GCC("-Wdouble-promotion")</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  </div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment">/*</span></div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment"> On systems, where qreal is a float you often run into</span></div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"> compiler issues with qMin/qMax.</span></div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="comment"> */</span></div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  </div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> QWT_CONSTEXPR <span class="keyword">inline</span> <span class="keywordtype">float</span> qwtMinF( <span class="keywordtype">float</span> a, <span class="keywordtype">float</span> b )</div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> {</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordflow">return</span> ( a < b ) ? a : b;</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span> }</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  </div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span> QWT_CONSTEXPR <span class="keyword">inline</span> <span class="keywordtype">double</span> qwtMinF( <span class="keywordtype">double</span> a, <span class="keywordtype">double</span> b )</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> {</div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">return</span> ( a < b ) ? a : b;</div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span> }</div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  </div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span> QWT_CONSTEXPR <span class="keyword">inline</span> qreal qwtMinF( <span class="keywordtype">float</span> a, <span class="keywordtype">double</span> b )</div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> {</div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keywordflow">return</span> ( a < b ) ? a : b;</div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span> }</div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  </div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span> QWT_CONSTEXPR <span class="keyword">inline</span> qreal qwtMinF( <span class="keywordtype">double</span> a, <span class="keywordtype">float</span> b )</div>
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span> {</div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keywordflow">return</span> ( a < b ) ? a : b;</div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> }</div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  </div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> QWT_CONSTEXPR <span class="keyword">inline</span> <span class="keywordtype">float</span> qwtMaxF( <span class="keywordtype">float</span> a, <span class="keywordtype">float</span> b )</div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> {</div>
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keywordflow">return</span> ( a < b ) ? b : a;</div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> }</div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  </div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> QWT_CONSTEXPR <span class="keyword">inline</span> <span class="keywordtype">double</span> qwtMaxF( <span class="keywordtype">double</span> a, <span class="keywordtype">double</span> b )</div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> {</div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keywordflow">return</span> ( a < b ) ? b : a;</div>
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<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> }</div>
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<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  </div>
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> QWT_CONSTEXPR <span class="keyword">inline</span> qreal qwtMaxF( <span class="keywordtype">float</span> a, <span class="keywordtype">double</span> b )</div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> {</div>
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<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keywordflow">return</span> ( a < b ) ? b : a;</div>
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<div class="line"><a name="l00142"></a><span class="lineno"> 142</span> }</div>
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<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  </div>
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span> QWT_CONSTEXPR <span class="keyword">inline</span> qreal qwtMaxF( <span class="keywordtype">double</span> a, <span class="keywordtype">float</span> b )</div>
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<div class="line"><a name="l00146"></a><span class="lineno"> 146</span> {</div>
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<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">return</span> ( a < b ) ? b : a;</div>
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<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> }</div>
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<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  </div>
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<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> <span class="preprocessor">#if defined( QT_WARNING_POP )</span></div>
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<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  QT_WARNING_POP</div>
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<div class="line"><a name="l00152"></a><span class="lineno"> 152</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  </div>
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<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> QWT_EXPORT <span class="keywordtype">double</span> qwtNormalizeRadians( <span class="keywordtype">double</span> radians );</div>
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<div class="line"><a name="l00155"></a><span class="lineno"> 155</span> QWT_EXPORT <span class="keywordtype">double</span> qwtNormalizeDegrees( <span class="keywordtype">double</span> degrees );</div>
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<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> QWT_EXPORT quint32 qwtRand();</div>
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<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  </div>
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<div class="line"><a name="l00170"></a><span class="lineno"> 170</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> qwtFuzzyCompare( <span class="keywordtype">double</span> value1, <span class="keywordtype">double</span> value2, <span class="keywordtype">double</span> intervalSize )</div>
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<div class="line"><a name="l00171"></a><span class="lineno"> 171</span> {</div>
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<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keyword">const</span> <span class="keywordtype">double</span> eps = qAbs( 1.0e-6 * intervalSize );</div>
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<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  </div>
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<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  <span class="keywordflow">if</span> ( value2 - value1 > eps )</div>
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<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keywordflow">return</span> -1;</div>
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<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  </div>
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<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <span class="keywordflow">if</span> ( value1 - value2 > eps )</div>
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<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <span class="keywordflow">return</span> 1;</div>
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<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  </div>
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<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a name="l00181"></a><span class="lineno"> 181</span> }</div>
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<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  </div>
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<div class="line"><a name="l00184"></a><span class="lineno"> 184</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> qwtSign( <span class="keywordtype">double</span> x )</div>
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<div class="line"><a name="l00185"></a><span class="lineno"> 185</span> {</div>
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<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="keywordflow">if</span> ( x > 0.0 )</div>
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<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="keywordflow">return</span> 1;</div>
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<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> ( x < 0.0 )</div>
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<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keywordflow">return</span> ( -1 );</div>
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<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  <span class="keywordflow">else</span></div>
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<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> }</div>
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<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  </div>
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<div class="line"><a name="l00195"></a><span class="lineno"> 195</span> <span class="keyword">inline</span> <span class="keywordtype">double</span> qwtSqr( <span class="keywordtype">double</span> x )</div>
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<div class="line"><a name="l00196"></a><span class="lineno"> 196</span> {</div>
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<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keywordflow">return</span> x * x;</div>
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<div class="line"><a name="l00198"></a><span class="lineno"> 198</span> }</div>
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<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  </div>
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<div class="line"><a name="l00201"></a><span class="lineno"> 201</span> <span class="keyword">inline</span> <span class="keywordtype">double</span> qwtFastAtan( <span class="keywordtype">double</span> x )</div>
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<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> {</div>
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<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  <span class="keywordflow">if</span> ( x < -1.0 )</div>
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<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keywordflow">return</span> -M_PI_2 - x / ( x * x + 0.28 );</div>
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<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  </div>
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<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  <span class="keywordflow">if</span> ( x > 1.0 )</div>
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<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="keywordflow">return</span> M_PI_2 - x / ( x * x + 0.28 );</div>
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<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  </div>
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<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  <span class="keywordflow">return</span> x / ( 1.0 + x * x * 0.28 );</div>
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<div class="line"><a name="l00210"></a><span class="lineno"> 210</span> }</div>
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<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  </div>
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<div class="line"><a name="l00213"></a><span class="lineno"> 213</span> <span class="keyword">inline</span> <span class="keywordtype">double</span> qwtFastAtan2( <span class="keywordtype">double</span> y, <span class="keywordtype">double</span> x )</div>
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<div class="line"><a name="l00214"></a><span class="lineno"> 214</span> {</div>
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<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  <span class="keywordflow">if</span> ( x > 0 )</div>
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<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  <span class="keywordflow">return</span> qwtFastAtan( y / x );</div>
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<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  </div>
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<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  <span class="keywordflow">if</span> ( x < 0 )</div>
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<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  {</div>
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<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="keyword">const</span> <span class="keywordtype">double</span> d = qwtFastAtan( y / x );</div>
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<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="keywordflow">return</span> ( y >= 0 ) ? d + M_PI : d - M_PI;</div>
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<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>  }</div>
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<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  </div>
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<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  <span class="keywordflow">if</span> ( y < 0.0 )</div>
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<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  <span class="keywordflow">return</span> -M_PI_2;</div>
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<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  </div>
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<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  <span class="keywordflow">if</span> ( y > 0.0 )</div>
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<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <span class="keywordflow">return</span> M_PI_2;</div>
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<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  </div>
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<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  <span class="keywordflow">return</span> 0.0;</div>
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<div class="line"><a name="l00231"></a><span class="lineno"> 231</span> }</div>
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<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  </div>
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<div class="line"><a name="l00233"></a><span class="lineno"> 233</span> <span class="comment">/* !</span></div>
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<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> <span class="comment"> \brief Calculate a value of a cubic polynomial</span></div>
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<div class="line"><a name="l00235"></a><span class="lineno"> 235</span> <span class="comment"></span> </div>
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<div class="line"><a name="l00236"></a><span class="lineno"> 236</span> <span class="comment"> \param x Value</span></div>
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<div class="line"><a name="l00237"></a><span class="lineno"> 237</span> <span class="comment"> \param a Cubic coefficient</span></div>
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<div class="line"><a name="l00238"></a><span class="lineno"> 238</span> <span class="comment"> \param b Quadratic coefficient</span></div>
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<div class="line"><a name="l00239"></a><span class="lineno"> 239</span> <span class="comment"> \param c Linear coefficient</span></div>
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<div class="line"><a name="l00240"></a><span class="lineno"> 240</span> <span class="comment"> \param d Constant offset</span></div>
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<div class="line"><a name="l00241"></a><span class="lineno"> 241</span> <span class="comment"></span> </div>
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<div class="line"><a name="l00242"></a><span class="lineno"> 242</span> <span class="comment"> \return Value of the polyonom for x</span></div>
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|
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span> <span class="comment"> */</span></div>
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<div class="line"><a name="l00244"></a><span class="lineno"> 244</span> <span class="keyword">inline</span> <span class="keywordtype">double</span> qwtCubicPolynomial( <span class="keywordtype">double</span> x,</div>
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<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keywordtype">double</span> a, <span class="keywordtype">double</span> b, <span class="keywordtype">double</span> c, <span class="keywordtype">double</span> d )</div>
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<div class="line"><a name="l00246"></a><span class="lineno"> 246</span> {</div>
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<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="keywordflow">return</span> ( ( ( a * x ) + b ) * x + c ) * x + d;</div>
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<div class="line"><a name="l00248"></a><span class="lineno"> 248</span> }</div>
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<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  </div>
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<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> <span class="keyword">inline</span> <span class="keywordtype">double</span> qwtRadians( <span class="keywordtype">double</span> degrees )</div>
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<div class="line"><a name="l00252"></a><span class="lineno"> 252</span> {</div>
|
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<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <span class="keywordflow">return</span> degrees * M_PI / 180.0;</div>
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<div class="line"><a name="l00254"></a><span class="lineno"> 254</span> }</div>
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<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  </div>
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<div class="line"><a name="l00257"></a><span class="lineno"> 257</span> <span class="keyword">inline</span> <span class="keywordtype">double</span> qwtDegrees( <span class="keywordtype">double</span> degrees )</div>
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<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> {</div>
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<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="keywordflow">return</span> degrees * 180.0 / M_PI;</div>
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<div class="line"><a name="l00260"></a><span class="lineno"> 260</span> }</div>
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<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  </div>
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<div class="line"><a name="l00266"></a><span class="lineno"> 266</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> qwtCeil( qreal value )</div>
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<div class="line"><a name="l00267"></a><span class="lineno"> 267</span> {</div>
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<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  <span class="keyword">using</span> std::ceil;</div>
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<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="keywordflow">return</span> int( ceil( value ) );</div>
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<div class="line"><a name="l00270"></a><span class="lineno"> 270</span> }</div>
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<div class="line"><a name="l00275"></a><span class="lineno"> 275</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> qwtFloor( qreal value )</div>
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<div class="line"><a name="l00276"></a><span class="lineno"> 276</span> {</div>
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<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <span class="keyword">using</span> std::floor;</div>
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<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  <span class="keywordflow">return</span> int( floor( value ) );</div>
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<div class="line"><a name="l00279"></a><span class="lineno"> 279</span> }</div>
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<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  </div>
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<div class="line"><a name="l00281"></a><span class="lineno"> 281</span> <span class="preprocessor">#endif</span></div>
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<li class="navelem"><a class="el" href="dir_68267d1309a1af8e8297ef4c3efbcdba.html">src</a></li><li class="navelem"><b>qwt_math.h</b></li>
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