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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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* Copyright (C) 1997 Josef Wilgen
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* Copyright (C) 2002 Uwe Rathmann
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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#include "qwt_global.h"
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#include "qwt_double_rect.h"
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#if QT_VERSION < 0x040000
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#else // QT_VERSION >= 0x040000
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#define LOG10_2 0.30102999566398119802 /* log10(2) */
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#define LOG10_3 0.47712125471966243540 /* log10(3) */
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#define LOG10_5 0.69897000433601885749 /* log10(5) */
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#define M_2PI 6.28318530717958623200 /* 2 pi */
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//! Mininum value for logarithmic scales
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#define LOG_MIN 1.0e-100
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//! Maximum value for logarithmic scales
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#define LOG_MAX 1.0e100
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#define M_E 2.7182818284590452354 /* e */
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#define M_LOG2E 1.4426950408889634074 /* log_2 e */
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#define M_LOG10E 0.43429448190325182765 /* log_10 e */
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#define M_LN2 0.69314718055994530942 /* log_e 2 */
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#define M_LN10 2.30258509299404568402 /* log_e 10 */
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#define M_PI 3.14159265358979323846 /* pi */
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#define M_PI_2 1.57079632679489661923 /* pi/2 */
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#define M_PI_4 0.78539816339744830962 /* pi/4 */
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#define M_1_PI 0.31830988618379067154 /* 1/pi */
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#define M_2_PI 0.63661977236758134308 /* 2/pi */
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#define M_2_SQRTPI 1.12837916709551257390 /* 2/sqrt(pi) */
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#define M_SQRT2 1.41421356237309504880 /* sqrt(2) */
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#define M_SQRT1_2 0.70710678118654752440 /* 1/sqrt(2) */
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QWT_EXPORT double qwtGetMin(const double *array, int size);
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QWT_EXPORT double qwtGetMax(const double *array, int size);
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inline int qwtSign(double x)
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//! Return the square of a number
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inline double qwtSqr(const double x)
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\brief Limit a value to fit into a specified interval
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\param x1 First interval boundary
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\param x2 Second interval boundary
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T qwtLim(const T& x, const T& x1, const T& x2)
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xmin = qwtMin(x1, x2);
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xmax = qwtMax(x1, x2);
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inline QPoint qwtPolar2Pos(const QPoint &pole,
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double radius, double angle)
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const double x = pole.x() + radius * ::cos(angle);
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const double y = pole.y() - radius * ::sin(angle);
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return QPoint(qRound(x), qRound(y));
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inline QPoint qwtDegree2Pos(const QPoint &pole,
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double radius, double angle)
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return qwtPolar2Pos(pole, radius, angle / 180.0 * M_PI);
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inline QwtDoublePoint qwtPolar2Pos(const QwtDoublePoint &pole,
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double radius, double angle)
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const double x = pole.x() + radius * ::cos(angle);
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const double y = pole.y() - radius * ::sin(angle);
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return QPoint(qRound(x), qRound(y));
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inline QwtDoublePoint qwtDegree2Pos(const QwtDoublePoint &pole,
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double radius, double angle)
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return qwtPolar2Pos(pole, radius, angle / 180.0 * M_PI);
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//! Rounding of doubles, like qRound for integers
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inline double qwtRound(double value)
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return ::floor(value + 0.5); // MSVC has no ::round().