Defines | Functions

qwt_math.h File Reference

#include <math.h>
#include <qpoint.h>
#include "qwt_global.h"
#include "qwt_double_rect.h"

Go to the source code of this file.

Defines

#define qwtMax   QMAX
#define qwtMin   QMIN
#define qwtAbs   QABS
#define LOG10_2   0.30102999566398119802
#define LOG10_3   0.47712125471966243540
#define LOG10_5   0.69897000433601885749
#define M_2PI   6.28318530717958623200
#define LOG_MIN   1.0e-100
 Mininum value for logarithmic scales.
#define LOG_MAX   1.0e100
 Maximum value for logarithmic scales.
#define M_E   2.7182818284590452354
#define M_LOG2E   1.4426950408889634074
#define M_LOG10E   0.43429448190325182765
#define M_LN2   0.69314718055994530942
#define M_LN10   2.30258509299404568402
#define M_PI   3.14159265358979323846
#define M_PI_2   1.57079632679489661923
#define M_PI_4   0.78539816339744830962
#define M_1_PI   0.31830988618379067154
#define M_2_PI   0.63661977236758134308
#define M_2_SQRTPI   1.12837916709551257390
#define M_SQRT2   1.41421356237309504880
#define M_SQRT1_2   0.70710678118654752440

Functions

double qwtGetMin (const double *array, int size)
 Find the smallest value in an array.
double qwtGetMax (const double *array, int size)
 Find the largest value in an array.
int qwtSign (double x)
 Return the sign.
double qwtSqr (const double x)
 Return the square of a number.
template<class T >
T qwtLim (const T &x, const T &x1, const T &x2)
 Limit a value to fit into a specified interval.
QPoint qwtPolar2Pos (const QPoint &pole, double radius, double angle)
QPoint qwtDegree2Pos (const QPoint &pole, double radius, double angle)
QwtDoublePoint qwtPolar2Pos (const QwtDoublePoint &pole, double radius, double angle)
QwtDoublePoint qwtDegree2Pos (const QwtDoublePoint &pole, double radius, double angle)
double qwtRound (double value)
 Rounding of doubles, like qRound for integers.

Define Documentation

#define LOG10_2   0.30102999566398119802

Definition at line 33 of file qwt_math.h.

#define LOG10_3   0.47712125471966243540

Definition at line 37 of file qwt_math.h.

#define LOG10_5   0.69897000433601885749

Definition at line 41 of file qwt_math.h.

#define LOG_MAX   1.0e100

Maximum value for logarithmic scales.

Definition at line 55 of file qwt_math.h.

Referenced by QwtLog10ScaleEngine::autoScale(), and QwtLog10ScaleEngine::divideScale().

#define LOG_MIN   1.0e-100

Mininum value for logarithmic scales.

Definition at line 50 of file qwt_math.h.

Referenced by QwtLog10ScaleEngine::autoScale(), and QwtLog10ScaleEngine::divideScale().

#define M_1_PI   0.31830988618379067154

Definition at line 91 of file qwt_math.h.

#define M_2_PI   0.63661977236758134308

Definition at line 95 of file qwt_math.h.

#define M_2_SQRTPI   1.12837916709551257390

Definition at line 99 of file qwt_math.h.

#define M_2PI   6.28318530717958623200

Definition at line 45 of file qwt_math.h.

#define M_E   2.7182818284590452354

Definition at line 59 of file qwt_math.h.

#define M_LN10   2.30258509299404568402

Definition at line 75 of file qwt_math.h.

#define M_LN2   0.69314718055994530942

Definition at line 71 of file qwt_math.h.

#define M_LOG10E   0.43429448190325182765

Definition at line 67 of file qwt_math.h.

#define M_LOG2E   1.4426950408889634074

Definition at line 63 of file qwt_math.h.

#define M_PI   3.14159265358979323846

Definition at line 79 of file qwt_math.h.

Referenced by qwtDegree2Pos().

#define M_PI_2   1.57079632679489661923

Definition at line 83 of file qwt_math.h.

Referenced by QwtDialSimpleNeedle::drawArrowNeedle(), QwtDialSimpleNeedle::drawRayNeedle(), QwtSimpleCompassRose::drawRose(), and line2Radians().

#define M_PI_4   0.78539816339744830962

Definition at line 87 of file qwt_math.h.

#define M_SQRT1_2   0.70710678118654752440

Definition at line 107 of file qwt_math.h.

#define M_SQRT2   1.41421356237309504880

Definition at line 103 of file qwt_math.h.

#define qwtAbs   QABS

Definition at line 22 of file qwt_math.h.

Referenced by QwtScaleEngine::buildInterval(), QwtScaleArithmetic::compareEps(), QwtLog10ScaleEngine::divideScale(), QwtLinearScaleEngine::divideScale(), QwtPicker::drawRubberBand(), QwtWheel::drawWheel(), QwtWheel::drawWheelBackground(), QwtPlotPicker::end(), QwtScaleDraw::getBorderDistHint(), QwtLinearColorMap::ColorStops::insert(), QwtScaleMap::pDist(), QwtPlotMagnifier::rescale(), QwtScaleMap::sDist(), QwtDoubleRange::setRange(), QwtDoubleRange::step(), QwtDoubleInterval::symmetrize(), and QwtMagnifier::widgetWheelEvent().

#define qwtMax   QMAX

Definition at line 20 of file qwt_math.h.

Referenced by QwtPlotLayout::alignScales(), QwtLog10ScaleEngine::autoScale(), QwtLinearScaleEngine::autoScale(), QwtScaleDiv::contains(), QwtDialSimpleNeedle::drawArrowNeedle(), QwtRoundScaleDraw::drawBackbone(), QwtKnob::drawMarker(), QwtCompassMagnetNeedle::drawPointer(), QwtDialSimpleNeedle::drawRayNeedle(), QwtPicker::drawRubberBand(), QwtCompassMagnetNeedle::drawThinNeedle(), QwtPlotPicker::end(), QwtDoubleSize::expandedTo(), QwtDoubleInterval::extend(), QwtScaleDraw::extent(), QwtRoundScaleDraw::extent(), QwtDoubleRect::intersects(), QwtLegend::layoutContents(), QwtDynGridLayout::layoutGrid(), QwtPlotLayout::layoutLegend(), QwtSlider::layoutSlider(), QwtThermo::layoutThermo(), QwtDoubleInterval::limited(), QwtSlider::minimumSizeHint(), QwtScaleWidget::minimumSizeHint(), QwtPlotLayout::minimumSizeHint(), QwtScaleDraw::minLength(), QwtAbstractSlider::mousePressEvent(), QwtDoubleRect::operator&(), QwtDoubleRect::operator|(), qwtGetMax(), qwtLim(), QwtKnob::setBorderWidth(), QwtLegendItem::setIdentifierWidth(), QwtWheel::setInternalBorder(), QwtKnob::setKnobWidth(), QwtScaleWidget::setMargin(), QwtScaleEngine::setMargins(), QwtDial::setScaleArc(), QwtScaleWidget::setSpacing(), QwtPlotLayout::setSpacing(), QwtLegendItem::setSpacing(), QwtSplineCurveFitter::setSplineSize(), QwtDoubleInterval::symmetrize(), QwtRichTextEngine::textSize(), QwtPicker::trackerRect(), QwtPicker::widgetKeyPressEvent(), and QwtPlotZoomer::zoom().

#define qwtMin   QMIN

Definition at line 21 of file qwt_math.h.

Referenced by QwtPlotLayout::alignScales(), QwtLog10ScaleEngine::autoScale(), QwtDoubleSize::boundedTo(), QwtDial::boundingRect(), QwtScaleDiv::contains(), QmitkHistogram::draw(), QwtRoundScaleDraw::drawBackbone(), QwtKnob::drawKnob(), QwtPainter::drawPolyline(), QwtScaleDraw::drawTick(), QwtPlotLayout::expandLineBreaks(), QwtDoubleInterval::extend(), QwtPlotLayout::LayoutData::init(), QwtDoubleRect::intersects(), QwtPlotLayout::layoutLegend(), QwtDoubleInterval::limited(), QwtPlotLayout::minimumSizeHint(), QwtDoubleRect::operator&(), QwtDoubleRect::operator|(), qwtGetMin(), qwtLim(), QwtThermo::setBorderWidth(), QwtWheel::setInternalBorder(), QwtDial::setScaleArc(), QwtIntervalData::size(), QwtArrayData::size(), QwtCounter::sizeHint(), QwtPicker::trackerRect(), QwtPicker::widgetKeyPressEvent(), and QwtPlotZoomer::zoom().

Function Documentation

QPoint qwtDegree2Pos ( const QPoint &  pole,
double  radius,
double  angle 
) [inline]

Definition at line 165 of file qwt_math.h.

References M_PI, and qwtPolar2Pos().

Referenced by QwtCompassMagnetNeedle::drawPointer(), QwtCompassWindArrow::drawStyle1Needle(), QwtCompassWindArrow::drawStyle2Needle(), and QwtCompassMagnetNeedle::drawTriangleNeedle().

{
    return qwtPolar2Pos(pole, radius, angle / 180.0 * M_PI);
}
QwtDoublePoint qwtDegree2Pos ( const QwtDoublePoint &  pole,
double  radius,
double  angle 
) [inline]

Definition at line 180 of file qwt_math.h.

References M_PI, and qwtPolar2Pos().

{
    return qwtPolar2Pos(pole, radius, angle / 180.0 * M_PI);
}
double qwtGetMax ( const double *  array,
int  size 
)

Find the largest value in an array.

Parameters:
arrayPointer to an array
sizeArray size

Definition at line 37 of file qwt_math.cpp.

References qwtMax.

{
    if (size <= 0)
       return 0.0;
    
    double rv = array[0];
    for (int i = 1; i < size; i++)
       rv = qwtMax(rv, array[i]);

    return rv;
}
double qwtGetMin ( const double *  array,
int  size 
)

Find the smallest value in an array.

Parameters:
arrayPointer to an array
sizeArray size

Definition at line 19 of file qwt_math.cpp.

References qwtMin.

{
    if (size <= 0)
       return 0.0;

    double rv = array[0];
    for (int i = 1; i < size; i++)
       rv = qwtMin(rv, array[i]);

    return rv;
}
template<class T >
T qwtLim ( const T &  x,
const T &  x1,
const T &  x2 
)

Limit a value to fit into a specified interval.

Parameters:
xInput value
x1First interval boundary
x2Second interval boundary

Definition at line 138 of file qwt_math.h.

References qwtMax, and qwtMin.

Referenced by QwtArrowButton::QwtArrowButton(), QwtRoundScaleDraw::setAngleRange(), QwtDoubleRange::setRange(), QwtWheel::setTickCnt(), QwtWheel::setViewAngle(), and verifyRange().

{
    T rv;
    T xmin, xmax;
    
    xmin = qwtMin(x1, x2);
    xmax = qwtMax(x1, x2);

    if ( x < xmin )
       rv = xmin;
    else if ( x > xmax )
       rv = xmax;
    else
       rv = x;

    return rv;
}
QwtDoublePoint qwtPolar2Pos ( const QwtDoublePoint &  pole,
double  radius,
double  angle 
) [inline]

Definition at line 171 of file qwt_math.h.

References QwtDoublePoint::x(), and QwtDoublePoint::y().

{
    const double x = pole.x() + radius * ::cos(angle);
    const double y = pole.y() - radius * ::sin(angle);

    return QPoint(qRound(x), qRound(y));
}
QPoint qwtPolar2Pos ( const QPoint &  pole,
double  radius,
double  angle 
) [inline]

Definition at line 156 of file qwt_math.h.

Referenced by QwtDialSimpleNeedle::drawArrowNeedle(), QwtDialSimpleNeedle::drawRayNeedle(), QwtSimpleCompassRose::drawRose(), and qwtDegree2Pos().

{
    const double x = pole.x() + radius * ::cos(angle);
    const double y = pole.y() - radius * ::sin(angle);

    return QPoint(qRound(x), qRound(y));
}
double qwtRound ( double  value ) [inline]

Rounding of doubles, like qRound for integers.

Definition at line 187 of file qwt_math.h.

{
    return ::floor(value + 0.5); // MSVC has no ::round().
}
int qwtSign ( double  x ) [inline]

Return the sign.

Definition at line 115 of file qwt_math.h.

{
    if (x > 0.0)
       return 1;
    else if (x < 0.0)
       return (-1);
    else
       return 0;
}
double qwtSqr ( const double  x ) [inline]

Return the square of a number.

Definition at line 126 of file qwt_math.h.

Referenced by QwtSpline::buildPeriodicSpline(), and QwtPlotCurve::closestPoint().

{
    return x*x;
}
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