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

NAME

QwtCompassScaleDraw - A special scale draw made for QwtCompass.

SYNOPSIS

#include <qwt_compass.h>

Inherits QwtRoundScaleDraw.

Public Member Functions


QwtCompassScaleDraw ()
Constructor. QwtCompassScaleDraw (const QMap< double, QString > &map)
Constructor. void setLabelMap (const QMap< double, QString > &map)
Set a map, mapping values to labels. QMap< double, QString > labelMap () const
virtual QwtText label (double value) const

Additional Inherited Members

Detailed Description

A special scale draw made for QwtCompass.

QwtCompassScaleDraw maps values to strings using a special map, that can be modified by the application

The default map consists of the labels N, NE, E, SE, S, SW, W, NW.

See also:

QwtCompass

Constructor & Destructor Documentation

QwtCompassScaleDraw::QwtCompassScaleDraw () [explicit]

Constructor. Initializes a label map for multiples of 45 degrees

QwtCompassScaleDraw::QwtCompassScaleDraw (const QMap< double, QString > & map) [explicit]

Constructor.

Parameters:

map Value to label map

Member Function Documentation

QwtText QwtCompassScaleDraw::label (double value) const [virtual]

Map a value to a corresponding label

Parameters:

value Value that will be mapped

label() looks in the labelMap() for a corresponding label for value or returns an null text.

Returns:

Label

See also:

labelMap(), setLabelMap()

Reimplemented from QwtAbstractScaleDraw.

QMap< double, QString > QwtCompassScaleDraw::labelMap () const

Returns:
map, mapping values to labels

See also:

setLabelMap()

void QwtCompassScaleDraw::setLabelMap (const QMap< double, QString > & map)

Set a map, mapping values to labels.

Parameters:

map Value to label map

The values of the major ticks are found by looking into this map. The default map consists of the labels N, NE, E, SE, S, SW, W, NW.

Warning:

The map will have no effect for values that are no major tick values. Major ticks can be changed by QwtScaleDraw::setScale

See also:

labelMap(), scaleDraw(), setScale()

Author

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Wed Jan 2 2019 Version 6.1.4