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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 50 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)
void setTransformationData (void *)
void * transformationData () const
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 98 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 120 of file qwt_scale_map.cpp.

References setScaleInterval().

QwtScaleMap::~QwtScaleMap  ) 
 

Destructor

Definition at line 131 of file qwt_scale_map.cpp.


Member Function Documentation

double QwtScaleMap::invTransform double  i  )  const
 

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

Definition at line 149 of file qwt_scale_map.h.

References QwtScaleTransformation::invXForm.

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

double QwtScaleMap::p1  )  const
 

Returns:
First border of the paint interval

Definition at line 113 of file qwt_scale_map.h.

double QwtScaleMap::p2  )  const
 

Returns:
Second border of the paint interval

Definition at line 121 of file qwt_scale_map.h.

double QwtScaleMap::s1  )  const
 

Returns:
First border of the scale interval

Definition at line 97 of file qwt_scale_map.h.

double QwtScaleMap::s2  )  const
 

Returns:
Second border of the scale interval

Definition at line 105 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 217 of file qwt_scale_map.cpp.

Referenced by QwtPlot::canvasMap(), QwtRoundScaleDraw::QwtRoundScaleDraw(), and QwtRoundScaleDraw::setAngleRange().

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 229 of file qwt_scale_map.cpp.

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 191 of file qwt_scale_map.cpp.

References QwtScaleTransformation::log10XForm(), LogMax, LogMin, and QwtScaleTransformation::xForm.

Referenced by QwtPlot::canvasMap(), and QwtScaleMap().

void QwtScaleMap::setTransformation const QwtScaleTransformation transformation  ) 
 

Initialize the map with a transformation

Definition at line 157 of file qwt_scale_map.cpp.

void QwtScaleMap::setTransformation bool  logarithmic  ) 
 

Initialize the map with a linear/logarithmic transformation

Definition at line 138 of file qwt_scale_map.cpp.

References QwtScaleTransformation::invXForm, QwtScaleTransformation::linearXForm(), QwtScaleTransformation::log10InvXForm(), QwtScaleTransformation::log10XForm(), transformation(), and QwtScaleTransformation::xForm.

Referenced by QwtPlot::canvasMap().

void QwtScaleMap::setTransformationData void *  transformationData  ) 
 

Add data, that will passed to the transformations

Warning:
The transformationData has to be deleted by the application

Definition at line 174 of file qwt_scale_map.cpp.

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 162 of file qwt_scale_map.h.

References xTransform().

Referenced by QwtPlotMarker::draw(), QwtPlotCurve::drawDots(), QwtRoundScaleDraw::drawLabel(), QwtPlotCurve::drawLines(), QwtPlotCurve::drawSteps(), QwtPlotCurve::drawSticks(), QwtPlotCurve::drawSymbols(), QwtScaleDraw::drawTick(), QwtRoundScaleDraw::drawTick(), QwtScaleDraw::labelPosition(), QwtRoundScaleDraw::labelRect(), QwtPlotPicker::transform(), and QwtPlot::transform().

const QwtScaleTransformation & QwtScaleMap::transformation  )  const
 

Get the transformation.

Definition at line 164 of file qwt_scale_map.cpp.

Referenced by setTransformation().

void * QwtScaleMap::transformationData  )  const
 

Get the data, that is passed to the transformations.

Definition at line 180 of file qwt_scale_map.cpp.

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 130 of file qwt_scale_map.h.

References QwtScaleTransformation::linearXForm(), QwtScaleTransformation::log10XForm(), and QwtScaleTransformation::xForm.

Referenced by QwtPlotCurve::closestPoint(), QwtPlotCurve::drawSpline(), and transform().


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