QwtScaleMap(3) Qwt User's Guide QwtScaleMap(3)

QwtScaleMap - A scale map.

#include <qwt_scale_map.h>


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 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 &)

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.

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

Destructor

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()

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()

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()

Returns:

True, when ( p1() < p2() ) != ( s1() < s2() )

Returns:

First border of the paint interval

Returns:

Second border of the paint interval

Returns:

qwtAbs(p2() - p1())

Returns:

First border of the scale interval

Returns:

Second border of the scale interval

Returns:

qwtAbs(s2() - s1())

Specify the borders of the paint device interval.

Parameters:

p1 first border
p2 second border

Specify the borders of the scale interval.

Parameters:

s1 first border
s2 second border

Warning:

scales might be aligned to transformation depending boundaries

Initialize the map with a transformation

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()

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()

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()

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Wed Jan 2 2019 Version 6.1.4