QwtScaleMap Class Reference

Collaboration diagram for QwtScaleMap:

[legend]List of all members.

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Detailed Description

A scale map.

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

Definition at line 55 of file qwt_scale_map.h.

Public Member Functions
	QwtScaleMap ()
	QwtScaleMap (const QwtScaleMap &)
	~QwtScaleMap ()
QwtScaleMap &	operator= (const QwtScaleMap &)
void	setTransformation (QwtScaleTransformation *)
const QwtScaleTransformation *	transformation () const
void	setPaintInterval (int p1, int p2)
void	setPaintXInterval (double p1, double p2)
void	setScaleInterval (double s1, double s2)
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

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Constructor & Destructor Documentation

QwtScaleMap::QwtScaleMap (   )

Constructor. The scale and paint device intervals are both set to [0,1]. Definition at line 84 of file qwt_scale_map.cpp.

QwtScaleMap::~QwtScaleMap (   )

Destructor Definition at line 108 of file qwt_scale_map.cpp.

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Member Function Documentation

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

Transform an paint device value into a value in the interval of the scale. Definition at line 163 of file qwt_scale_map.h. References QwtScaleTransformation::invXForm(). Referenced by QwtPainter::drawColorBar(), QwtPlotPicker::invTransform(), and QwtPlotItem::invTransform().

double QwtScaleMap::p1 (   )  const [inline]

Returns: First border of the paint interval Definition at line 119 of file qwt_scale_map.h. Referenced by QwtPlotItem::paintRect(), and QwtPlotSpectrogram::renderImage().

double QwtScaleMap::p2 (   )  const [inline]

Returns: Second border of the paint interval Definition at line 127 of file qwt_scale_map.h. Referenced by QwtPlotSpectrogram::renderImage().

double QwtScaleMap::s1 (   )  const [inline]

Returns: First border of the scale interval Definition at line 103 of file qwt_scale_map.h. Referenced by QwtPlotSpectrogram::renderImage(), and QwtPlotItem::scaleRect().

double QwtScaleMap::s2 (   )  const [inline]

Returns: Second border of the scale interval Definition at line 111 of file qwt_scale_map.h. Referenced by QwtPlotSpectrogram::renderImage().

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 180 of file qwt_scale_map.cpp. References QwtScaleTransformation::type(). Referenced by QwtPlot::canvasMap(), QwtPainter::drawColorBar(), QwtRoundScaleDraw::QwtRoundScaleDraw(), QwtPlotSpectrogram::renderImage(), QwtRoundScaleDraw::setAngleRange(), and QwtPlotSvgItem::viewBox().

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 194 of file qwt_scale_map.cpp. References QwtScaleTransformation::type().

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 153 of file qwt_scale_map.cpp. References LogMax, LogMin, and QwtScaleTransformation::type(). Referenced by QwtPlot::canvasMap(), QwtPlotSpectrogram::renderImage(), setTransformation(), and QwtPlotSvgItem::viewBox().

void QwtScaleMap::setTransformation (  QwtScaleTransformation *  transformation  )

Initialize the map with a transformation Definition at line 130 of file qwt_scale_map.cpp. References setScaleInterval(), and transformation(). Referenced by QwtPlot::canvasMap().

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. ) See also: QwtScaleMap::xTransform Definition at line 175 of file qwt_scale_map.h. References xTransform(). Referenced by QwtPlotCurve::closePolyline(), QwtPlotMarker::draw(), QwtPlotSpectrogram::drawContourLines(), QwtPlotCurve::drawDots(), QwtRoundScaleDraw::drawLabel(), QwtPlotCurve::drawSteps(), QwtPlotCurve::drawSticks(), QwtPlotCurve::drawSymbols(), QwtRoundScaleDraw::drawTick(), QwtRoundScaleDraw::extent(), QwtScaleDraw::labelPosition(), QwtPlotPanner::moveCanvas(), QwtPlotPicker::transform(), and QwtPlotItem::transform().

const QwtScaleTransformation * QwtScaleMap::transformation (   )  const

Get the transformation. Definition at line 142 of file qwt_scale_map.cpp. Referenced by QwtScaleWidget::setScaleDiv(), and setTransformation().

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 Definition at line 146 of file qwt_scale_map.h. References QwtScaleTransformation::type(), and QwtScaleTransformation::xForm(). Referenced by QwtPlotCurve::closestPoint(), QwtPlotCurve::drawLines(), transform(), and QwtPlotSvgItem::viewBox().

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