QwtScaleMap(3) | Qwt User's Guide | QwtScaleMap(3) |
NAME¶
QwtScaleMap -SYNOPSIS¶
#include <qwt_scale_map.h>
Public Member Functions¶
QwtScaleMap ()
QwtScaleMap (const QwtScaleMap &)
~QwtScaleMap ()
double invTransform (double i) const
QwtScaleMap & operator= (const QwtScaleMap &)
double p1 () const
double p2 () const
double pDist () const
double s1 () const
double s2 () const
double sDist () const
void setPaintInterval (int p1, int p2)
void setPaintXInterval (double p1, double p2)
void setScaleInterval (double s1, double s2)
void setTransformation (QwtScaleTransformation *)
int transform (double x) const
const QwtScaleTransformation * transformation () const
double xTransform (double x) const
Public Attributes¶
QT_STATIC_CONST double LogMax = 1.0e150
QT_STATIC_CONST double LogMin = 1.0e-150
Detailed Description¶
A scale map.QwtScaleMap offers transformations from a scale into a paint interval and vice versa.
Constructor & Destructor Documentation¶
QwtScaleMap::QwtScaleMap ()¶
Constructor. The scale and paint device intervals are both set to [0,1].QwtScaleMap::~QwtScaleMap ()¶
DestructorMember Function Documentation¶
double QwtScaleMap::invTransform (doublep) 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()
double QwtScaleMap::p1 () const [inline]¶
Returns:First border of the paint interval
double QwtScaleMap::p2 () const [inline]¶
Returns:Second border of the paint interval
double QwtScaleMap::pDist () const [inline]¶
Returns:qwtAbs(p2() - p1())
double QwtScaleMap::s1 () const [inline]¶
Returns:First border of the scale interval
double QwtScaleMap::s2 () const [inline]¶
Returns:Second border of the scale interval
double QwtScaleMap::sDist () const [inline]¶
Returns:qwtAbs(s2() - s1())
void QwtScaleMap::setPaintInterval (intp1, intp2)¶
Specify the borders of the paint device interval. Parameters:p1 first border
p2 second border
p2 second border
void QwtScaleMap::setPaintXInterval (doublep1, doublep2)¶
Specify the borders of the paint device interval. Parameters:p1 first border
p2 second border
p2 second border
void QwtScaleMap::setScaleInterval (doubles1, doubles2)¶
Specify the borders of the scale interval. Parameters:s1 first border
s2 second border
s2 second border
Warning:
logarithmic scales might be aligned to [LogMin,
LogMax]
void QwtScaleMap::setTransformation (QwtScaleTransformation *transformation)¶
Initialize the map with a transformationint QwtScaleMap::transform (doubles) 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()
double QwtScaleMap::xTransform (doubles) const [inline]¶
Transform a point related to the scale interval into an point related to the interval of the paint deviceParameters:
s Value relative to the coordinates of the
scale
Author¶
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