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QwtScaleMap Class Reference

Collaboration diagram for QwtScaleMap:

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List of all members.

Detailed Description

A scale map.

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

Definition at line 47 of file qwt_scale_map.h.

Public Member Functions

 QwtScaleMap ()
 QwtScaleMap (int i1, int i2, double d1, double d2)
 ~QwtScaleMap ()
void setTransformation (bool logarithmic)
void setTransformation (const QwtScaleTransformation &)
const QwtScaleTransformationtransformation () 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

Public Attributes

QT_STATIC_CONST double LogMin = 1.0e-150
QT_STATIC_CONST double LogMax = 1.0e150


Constructor & Destructor Documentation

QwtScaleMap::QwtScaleMap  ) 
 

Constructor.

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

Definition at line 104 of file qwt_scale_map.cpp.

QwtScaleMap::QwtScaleMap int  p1,
int  p2,
double  s1,
double  s2
 

Constructor.

Constructs a QwtScaleMap instance with initial paint device and scale intervals

Parameters:
p1 first border of paint device interval
p2 second border of paint device interval
s1 first border of scale interval
s2 second border of scale interval

Definition at line 125 of file qwt_scale_map.cpp.

References setScaleInterval().

QwtScaleMap::~QwtScaleMap  ) 
 

Destructor.

Definition at line 135 of file qwt_scale_map.cpp.


Member Function Documentation

double QwtScaleMap::invTransform double  y  )  const
 

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

Definition at line 141 of file qwt_scale_map.h.

References QwtScaleTransformation::invXForm.

Referenced by QwtSlider::getValue(), QwtPlotPicker::invTransform(), and QwtPlot::invTransform().

double QwtScaleMap::p1  )  const
 

Returns:
First border of the paint interval

Definition at line 106 of file qwt_scale_map.h.

double QwtScaleMap::p2  )  const
 

Returns:
Second border of the paint interval

Definition at line 114 of file qwt_scale_map.h.

double QwtScaleMap::s1  )  const
 

Returns:
First border of the scale interval

Definition at line 90 of file qwt_scale_map.h.

double QwtScaleMap::s2  )  const
 

Returns:
Second border of the scale interval

Definition at line 98 of file qwt_scale_map.h.

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 197 of file qwt_scale_map.cpp.

Referenced by QwtPlot::canvasMap(), QwtThermo::layoutThermo(), QwtScaleDraw::setAngleRange(), and QwtScaleDraw::setGeometry().

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 209 of file qwt_scale_map.cpp.

Referenced by QwtSlider::layoutSlider().

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 171 of file qwt_scale_map.cpp.

References QwtScaleTransformation::xForm.

Referenced by QwtPlot::canvasMap(), QwtScaleMap(), QwtSlider::rangeChange(), QwtThermo::setRange(), and QwtScaleDraw::setScaleDiv().

int QwtScaleMap::transform double  x  )  const
 

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 153 of file qwt_scale_map.h.

References xTransform().

Referenced by QwtScaleDraw::drawTick(), QwtScaleDraw::labelPlacement(), QwtPlotPicker::transform(), QwtPlot::transform(), and QwtSlider::xyPosition().

double QwtScaleMap::xTransform double  x  )  const
 

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

Definition at line 123 of file qwt_scale_map.h.

References QwtScaleTransformation::xForm.

Referenced by transform().


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