QwtScaleMap - Man Page
A scale map.
Synopsis
#include <qwt_scale_map.h>
Public Member Functions
QwtScaleMap ()
Constructor.
QwtScaleMap (const QwtScaleMap &)
Copy constructor.
~QwtScaleMap ()
QwtScaleMap & operator= (const QwtScaleMap &)
Assignment operator.
void setTransformation (QwtTransform *)
const QwtTransform * transformation () const
Get the transformation.
void setPaintInterval (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.
double transform (double s) const
double invTransform (double p) const
double p1 () const
double p2 () const
double s1 () const
double s2 () const
double pDist () const
double sDist () const
bool isInverting () const
Static Public Member Functions
static QRectF transform (const QwtScaleMap &, const QwtScaleMap &, const QRectF &)
static QRectF invTransform (const QwtScaleMap &, const QwtScaleMap &, const QRectF &)
static QPointF transform (const QwtScaleMap &, const QwtScaleMap &, const QPointF &)
static QPointF invTransform (const QwtScaleMap &, const QwtScaleMap &, const QPointF &)
Detailed Description
A scale map.
QwtScaleMap offers transformations from the coordinate system of a scale into the linear coordinate system of a paint device and vice versa.
Definition at line 26 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 21 of file qwt_scale_map.cpp.
QwtScaleMap::~QwtScaleMap ()
Destructor
Definition at line 49 of file qwt_scale_map.cpp.
Member Function Documentation
QPointF QwtScaleMap::invTransform (const QwtScaleMap & xMap, const QwtScaleMap & yMap, const QPointF & pos) [static]
Transform a rectangle from paint to scale coordinates
- Parameters
xMap X map
yMap Y map
pos Position in paint coordinates- Returns
Position in scale coordinates
- See also
transform()
Definition at line 187 of file qwt_scale_map.cpp.
QRectF QwtScaleMap::invTransform (const QwtScaleMap & xMap, const QwtScaleMap & yMap, const QRectF & rect) [static]
Transform a rectangle from paint to scale coordinates
- Parameters
xMap X map
yMap Y map
rect Rectangle in paint coordinates- Returns
Rectangle in scale coordinates
- See also
transform()
Definition at line 224 of file qwt_scale_map.cpp.
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
- Returns
Transformed value
- See also
transform()
Definition at line 154 of file qwt_scale_map.h.
bool QwtScaleMap::isInverting () const [inline]
- Returns
True, when ( p1() < p2() ) != ( s1() < s2() )
Definition at line 164 of file qwt_scale_map.h.
double QwtScaleMap::p1 () const [inline]
- Returns
First border of the paint interval
Definition at line 99 of file qwt_scale_map.h.
double QwtScaleMap::p2 () const [inline]
- Returns
Second border of the paint interval
Definition at line 107 of file qwt_scale_map.h.
double QwtScaleMap::pDist () const [inline]
- Returns
qwtAbs(p2() - p1())
Definition at line 115 of file qwt_scale_map.h.
double QwtScaleMap::s1 () const [inline]
- Returns
First border of the scale interval
Definition at line 83 of file qwt_scale_map.h.
double QwtScaleMap::s2 () const [inline]
- Returns
Second border of the scale interval
Definition at line 91 of file qwt_scale_map.h.
double QwtScaleMap::sDist () const [inline]
- Returns
qwtAbs(s2() - s1())
Definition at line 123 of file qwt_scale_map.h.
void QwtScaleMap::setPaintInterval (double p1, double p2)
Specify the borders of the paint device interval.
- Parameters
p1 first border
p2 second border
Definition at line 119 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
scales might be aligned to transformation depending boundaries
Definition at line 100 of file qwt_scale_map.cpp.
void QwtScaleMap::setTransformation (QwtTransform * transform)
Initialize the map with a transformation
Definition at line 76 of file qwt_scale_map.cpp.
QPointF QwtScaleMap::transform (const QwtScaleMap & xMap, const QwtScaleMap & yMap, const QPointF & pos) [static]
Transform a point from scale to paint coordinates
- Parameters
xMap X map
yMap Y map
pos Position in scale coordinates- Returns
Position in paint coordinates
- See also
invTransform()
Definition at line 206 of file qwt_scale_map.cpp.
QRectF QwtScaleMap::transform (const QwtScaleMap & xMap, const QwtScaleMap & yMap, const QRectF & rect) [static]
Transform a rectangle from scale to paint coordinates
- Parameters
xMap X map
yMap Y map
rect Rectangle in scale coordinates- Returns
Rectangle in paint coordinates
- See also
invTransform()
Definition at line 153 of file qwt_scale_map.cpp.
double 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
- Parameters
s Value relative to the coordinates of the scale
- Returns
Transformed value
- See also
invTransform()
Definition at line 137 of file qwt_scale_map.h.
Author
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