QwtScaleMap(3)

Qwt User's Guide

QwtScaleMap(3)

NAME

QwtScaleMap - 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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Sun Jul 18 2021

Version 6.2.0