A scale map. More...

#include <qwt_scale_map.h>

Collaboration diagram for QwtScaleMap:

Public Member Functions
	QwtScaleMap ()
	Constructor.
	QwtScaleMap (const QwtScaleMap &)
	Copy constructor.
	~QwtScaleMap ()
QwtScaleMap &	operator= (const QwtScaleMap &)
	Assignment operator.
void	setTransformation (QwtScaleTransformation *)
const QwtScaleTransformation *	transformation () const
	Get the transformation.
void	setPaintInterval (int p1, int p2)
	Specify the borders of the paint device interval.
void	setPaintXInterval (double p1, double p2)
	Specify the borders of the paint device interval.
void	setScaleInterval (double s1, double s2)
	Specify the borders of the scale interval.
int	transform (double x) const
double	invTransform (double i) const
double	xTransform (double x) const
double	p1 () const
double	p2 () const
double	s1 () const
double	s2 () const
double	pDist () const
double	sDist () const
Public Attributes
QT_STATIC_CONST double	LogMin = 1.0e-150
QT_STATIC_CONST double	LogMax = 1.0e150

Detailed Description

A scale map.

QwtScaleMap offers transformations from a scale into a paint interval and vice versa.

Definition at line 56 of file qwt_scale_map.h.

Constructor & Destructor Documentation

QwtScaleMap::QwtScaleMap ( )

Constructor.

The scale and paint device intervals are both set to [0,1].

Definition at line 86 of file qwt_scale_map.cpp.

References QwtScaleTransformation::Linear.

                        :
    d_s1(0.0),
    d_s2(1.0),
    d_p1(0.0),
    d_p2(1.0),
    d_cnv(1.0)
{
    d_transformation = new QwtScaleTransformation(
        QwtScaleTransformation::Linear);
}

QwtScaleMap::QwtScaleMap ( const QwtScaleMap & other )

Copy constructor.

Definition at line 98 of file qwt_scale_map.cpp.

References QwtScaleTransformation::copy().

                                                :
    d_s1(other.d_s1),
    d_s2(other.d_s2),
    d_p1(other.d_p1),
    d_p2(other.d_p2),
    d_cnv(other.d_cnv)
{
    d_transformation = other.d_transformation->copy();
}

QwtScaleMap::~QwtScaleMap ( )

Destructor

Definition at line 111 of file qwt_scale_map.cpp.

{
    delete d_transformation;
}

Member Function Documentation

double QwtScaleMap::invTransform ( double p ) const [inline]

Transform an paint device value into a value in the interval of the scale.

Parameters:

p	Value relative to the coordinates of the paint device

See also:: transform()

Definition at line 175 of file qwt_scale_map.h.

References QwtScaleTransformation::invXForm().

Referenced by QwtPainter::drawColorBar(), QwtSlider::getValue(), QwtPlotPicker::invTransform(), QwtPlotItem::invTransform(), QwtPlotPanner::moveCanvas(), and QwtPlotSpectrogram::renderImage().

{
    return d_transformation->invXForm(p, d_p1, d_p2, d_s1, d_s2 );
}

QwtScaleMap & QwtScaleMap::operator= ( const QwtScaleMap & other )

Assignment operator.

Definition at line 117 of file qwt_scale_map.cpp.

References QwtScaleTransformation::copy().

{
    d_s1 = other.d_s1;
    d_s2 = other.d_s2;
    d_p1 = other.d_p1;
    d_p2 = other.d_p2;
    d_cnv = other.d_cnv;

    delete d_transformation;
    d_transformation = other.d_transformation->copy();

    return *this;
}

double QwtScaleMap::p1 ( ) const [inline]

Returns:: First border of the paint interval

Definition at line 120 of file qwt_scale_map.h.

Referenced by QwtSlider::getScrollMode(), QwtPlotItem::paintRect(), QwtPlotSpectrogram::renderImage(), setPaintInterval(), and setPaintXInterval().

{
    return d_p1;
}

double QwtScaleMap::p2 ( ) const [inline]

Returns:: Second border of the paint interval

Definition at line 128 of file qwt_scale_map.h.

Referenced by QwtSlider::getScrollMode(), QwtPlotSpectrogram::renderImage(), setPaintInterval(), and setPaintXInterval().

{
    return d_p2;
}

double QwtScaleMap::pDist ( ) const [inline]

Returns:: qwtAbs(p2() - p1())

Definition at line 136 of file qwt_scale_map.h.

References qwtAbs.

Referenced by QwtPlotItem::paintRect().

{
    return qwtAbs(d_p2 - d_p1);
}

double QwtScaleMap::s1 ( ) const [inline]

Returns:: First border of the scale interval

Definition at line 104 of file qwt_scale_map.h.

Referenced by QwtPlotSpectrogram::renderImage(), QwtPlotItem::scaleRect(), and setScaleInterval().

{
    return d_s1;
}

double QwtScaleMap::s2 ( ) const [inline]

Returns:: Second border of the scale interval

Definition at line 112 of file qwt_scale_map.h.

Referenced by QwtPlotSpectrogram::renderImage(), and setScaleInterval().

{
    return d_s2;
}

double QwtScaleMap::sDist ( ) const [inline]

Returns:: qwtAbs(s2() - s1())

Definition at line 144 of file qwt_scale_map.h.

References qwtAbs.

Referenced by QwtPlotItem::scaleRect().

{
    return qwtAbs(d_s2 - d_s1);
}

void QwtScaleMap::setPaintInterval	(	int	p1,
		int	p2
	)

Specify the borders of the paint device interval.

Parameters:

p1	first border
p2	second border

Definition at line 184 of file qwt_scale_map.cpp.

References QwtScaleTransformation::Other, p1(), p2(), and QwtScaleTransformation::type().

Referenced by QwtPlot::canvasMap(), QwtPlotRasterItem::draw(), QwtPainter::drawColorBar(), QwtThermo::layoutThermo(), QwtRoundScaleDraw::QwtRoundScaleDraw(), QwtPlotSpectrogram::renderImage(), QwtRoundScaleDraw::setAngleRange(), and QwtPlotSvgItem::viewBox().

{
    d_p1 = p1;
    d_p2 = p2;

    if ( d_transformation->type() != QwtScaleTransformation::Other )
        newFactor();
}

void QwtScaleMap::setPaintXInterval	(	double	p1,
		double	p2
	)

Specify the borders of the paint device interval.

Parameters:

p1	first border
p2	second border

Definition at line 198 of file qwt_scale_map.cpp.

References QwtScaleTransformation::Other, p1(), p2(), and QwtScaleTransformation::type().

Referenced by QwtSlider::layoutSlider(), and QwtPlot::print().

{
    d_p1 = p1;
    d_p2 = p2;

    if ( d_transformation->type() != QwtScaleTransformation::Other )
        newFactor();
}

void QwtScaleMap::setScaleInterval	(	double	s1,
		double	s2
	)

Specify the borders of the scale interval.

Parameters:

s1	first border
s2	second border

Warning:: logarithmic scales might be aligned to [LogMin, LogMax]

Definition at line 157 of file qwt_scale_map.cpp.

References QwtScaleTransformation::Log10, LogMax, LogMin, QwtScaleTransformation::Other, s1(), s2(), and QwtScaleTransformation::type().

Referenced by QwtPlot::canvasMap(), QwtPlot::print(), QwtThermo::PrivateData::PrivateData(), QwtSlider::rangeChange(), QwtPlotSpectrogram::renderImage(), QwtThermo::setRange(), QwtAbstractScaleDraw::setScaleDiv(), setTransformation(), and QwtPlotSvgItem::viewBox().

{
    if (d_transformation->type() == QwtScaleTransformation::Log10 )
    {
        if (s1 < LogMin) 
           s1 = LogMin;
        else if (s1 > LogMax) 
           s1 = LogMax;
        
        if (s2 < LogMin) 
           s2 = LogMin;
        else if (s2 > LogMax) 
           s2 = LogMax;
    }

    d_s1 = s1;
    d_s2 = s2;

    if ( d_transformation->type() != QwtScaleTransformation::Other )
        newFactor();
}

void QwtScaleMap::setTransformation ( QwtScaleTransformation * transformation )

Initialize the map with a transformation

Definition at line 134 of file qwt_scale_map.cpp.

References setScaleInterval(), and transformation().

Referenced by QwtPlot::canvasMap(), QwtPlot::print(), QwtThermo::setRange(), and QwtAbstractScaleDraw::setTransformation().

{
    if ( transformation == NULL )
        return;

    delete d_transformation;
    d_transformation = transformation;
    setScaleInterval(d_s1, d_s2);
}

int QwtScaleMap::transform ( double s ) const [inline]

Transform a point related to the scale interval into an point related to the interval of the paint device and round it to an integer. (In Qt <= 3.x paint devices are integer based. )

Parameters:

s	Value relative to the coordinates of the scale

See also:: xTransform()

Definition at line 188 of file qwt_scale_map.h.

References xTransform().

Referenced by QwtPlotCurve::closePolyline(), QwtPlotScaleItem::draw(), QwtPlotMarker::draw(), QmitkHistogram::draw(), QwtPlotSpectrogram::drawContourLines(), QwtPlotCurve::drawDots(), QwtRoundScaleDraw::drawLabel(), QwtPlotCurve::drawLines(), QwtPlotCurve::drawSteps(), QwtPlotCurve::drawSticks(), QwtPlotCurve::drawSymbols(), QwtRoundScaleDraw::drawTick(), QwtRoundScaleDraw::extent(), QwtScaleDraw::labelPosition(), QwtPlotPanner::moveCanvas(), QwtPlotPicker::transform(), QwtPlotItem::transform(), and QwtSlider::xyPosition().

{
    return qRound(xTransform(s));
}

const QwtScaleTransformation * QwtScaleMap::transformation ( ) const

Get the transformation.

Definition at line 146 of file qwt_scale_map.cpp.

Referenced by QwtPlotScaleItem::draw(), QwtScaleWidget::setScaleDiv(), and setTransformation().

{
    return d_transformation;
}

double QwtScaleMap::xTransform ( double s ) const [inline]

Transform a point related to the scale interval into an point related to the interval of the paint device

Parameters:

s	Value relative to the coordinates of the scale

Definition at line 155 of file qwt_scale_map.h.

References QwtScaleTransformation::Linear, QuadProgPP::log(), QwtScaleTransformation::Log10, QwtScaleTransformation::type(), and QwtScaleTransformation::xForm().

Referenced by QwtPlotCurve::closestPoint(), QwtPlotCurve::drawLines(), transform(), and QwtPlotSvgItem::viewBox().

{
    // try to inline code from QwtScaleTransformation

    if ( d_transformation->type() == QwtScaleTransformation::Linear )
        return d_p1 + (s - d_s1) * d_cnv;

    if ( d_transformation->type() == QwtScaleTransformation::Log10 )
        return d_p1 + log(s / d_s1) * d_cnv;

    return d_transformation->xForm(s, d_s1, d_s2, d_p1, d_p2 );
}

Member Data Documentation

QT_STATIC_CONST_IMPL double QwtScaleMap::LogMax = 1.0e150

Definition at line 88 of file qwt_scale_map.h.

Referenced by setScaleInterval().

QT_STATIC_CONST_IMPL double QwtScaleMap::LogMin = 1.0e-150

Definition at line 87 of file qwt_scale_map.h.

Referenced by setScaleInterval().

The documentation for this class was generated from the following files:

QwtScaleMap Class Reference

Public Member Functions

Public Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation