A class for drawing scales. Más...

#include <qwt_scale_draw.h>

Diagrama de herencias de QwtScaleDraw

Clases
class	PrivateData
Tipos públicos
enum	Alignment { BottomScale, TopScale, LeftScale, RightScale }
Métodos públicos
	QwtScaleDraw ()
	Constructor.
	QwtScaleDraw (const QwtScaleDraw &)
	Copy constructor.
virtual	~QwtScaleDraw ()
	Destructor.
QwtScaleDraw &	operator= (const QwtScaleDraw &other)
	Assignment operator.
void	getBorderDistHint (const QFont &, int &start, int &end) const
	Determine the minimum border distance.
int	minLabelDist (const QFont &) const
int	minLength (const QPen &, const QFont &) const
virtual int	extent (const QPen &, const QFont &) const
void	move (int x, int y)
void	move (const QPoint &)
	Move the position of the scale.
void	setLength (int length)
Alignment	alignment () const
void	setAlignment (Alignment)
Qt::Orientation	orientation () const
QPoint	pos () const
int	length () const
void	setLabelAlignment (int)
	Change the label flags.
int	labelAlignment () const
void	setLabelRotation (double rotation)
double	labelRotation () const
int	maxLabelHeight (const QFont &) const
int	maxLabelWidth (const QFont &) const
QPoint	labelPosition (double val) const
QRect	labelRect (const QFont &, double val) const
QSize	labelSize (const QFont &, double val) const
QRect	boundingLabelRect (const QFont &, double val) const
Métodos protegidos
QWMatrix	labelMatrix (const QPoint &, const QSize &) const
virtual void	drawTick (QPainter *p, double val, int len) const
virtual void	drawBackbone (QPainter *p) const
virtual void	drawLabel (QPainter *p, double val) const

Descripción detallada

A class for drawing scales.

QwtScaleDraw can be used to draw linear or logarithmic scales. A scale has a position, an alignment and a length, which can be specified . The labels can be rotated and aligned to the ticks using setLabelRotation() and setLabelAlignment().

After a scale division has been specified as a QwtScaleDiv object using QwtAbstractScaleDraw::setScaleDiv(const QwtScaleDiv &s), the scale can be drawn with the QwtAbstractScaleDraw::draw() member.

Documentación de las enumeraciones miembro de la clase

enum QwtScaleDraw::Alignment

Alignment of the scale draw

Ver también:: setAlignment(), alignment()

Valores de enumeraciones:

BottomScale
TopScale
LeftScale
RightScale

Documentación del constructor y destructor

QwtScaleDraw::QwtScaleDraw ( )

Constructor.

The range of the scale is initialized to [0, 100], The position is at (0, 0) with a length of 100. The orientation is QwtAbstractScaleDraw::Bottom.

QwtScaleDraw::QwtScaleDraw ( const QwtScaleDraw & other )

Copy constructor.

QwtScaleDraw::~QwtScaleDraw ( ) [virtual]

Destructor.

Documentación de las funciones miembro

QwtScaleDraw::Alignment QwtScaleDraw::alignment ( ) const

Return alignment of the scale

Ver también:: setAlignment()

QRect QwtScaleDraw::boundingLabelRect	(	const QFont &	font,
		double	value
	)		const

Find the bounding rect for the label. The coordinates of the rect are absolute coordinates ( calculated from pos() ). in direction of the tick.

Parámetros:

font	Font used for painting
value	Value

Ver también:: labelRect()

void QwtScaleDraw::drawBackbone ( QPainter * painter ) const [protected, virtual]

Draws the baseline of the scale

Parámetros:

painter Painter

Ver también:: drawTick(), drawLabel()

Implementa QwtAbstractScaleDraw.

void QwtScaleDraw::drawLabel	(	QPainter *	painter,
		double	value
	)		const `[protected, virtual]`

Draws the label for a major scale tick

Parámetros:

painter	Painter
value	Value

Ver también:: drawTick(), drawBackbone(), boundingLabelRect()

Implementa QwtAbstractScaleDraw.

void QwtScaleDraw::drawTick	(	QPainter *	painter,
		double	value,
		int	len
	)		const `[protected, virtual]`

Draw a tick

Parámetros:

painter	Painter
value	Value of the tick
len	Lenght of the tick

Ver también:: drawBackbone(), drawLabel()

Implementa QwtAbstractScaleDraw.

int QwtScaleDraw::extent	(	const QPen &	pen,
		const QFont &	font
	)		const `[virtual]`

Calculate the width/height that is needed for a vertical/horizontal scale.

The extent is calculated from the pen width of the backbone, the major tick length, the spacing and the maximum width/height of the labels.

Parámetros:

pen	Pen that is used for painting backbone and ticks
font	Font used for painting the labels

Ver también:: minLength()

Implementa QwtAbstractScaleDraw.

void QwtScaleDraw::getBorderDistHint	(	const QFont &	font,
		int &	start,
		int &	end
	)		const

Determine the minimum border distance.

This member function returns the minimum space needed to draw the mark labels at the scale's endpoints.

Parámetros:

font	Font
start	Start border distance
end	End border distance

int QwtScaleDraw::labelAlignment ( ) const

Devuelve:: the label flags

Ver también:: setLabelAlignment(), labelRotation()

QwtMatrix QwtScaleDraw::labelMatrix	(	const QPoint &	pos,
		const QSize &	size
	)		const `[protected]`

Calculate the matrix that is needed to paint a label depending on its alignment and rotation.

Parámetros:

pos	Position where to paint the label
size	Size of the label

Ver también:: setLabelAlignment(), setLabelRotation()

QPoint QwtScaleDraw::labelPosition ( double value ) const

Find the position, where to paint a label

The position has a distance of majTickLength() + spacing() + 1 from the backbone. The direction depends on the alignment()

Parámetros:

value Value

QRect QwtScaleDraw::labelRect	(	const QFont &	font,
		double	value
	)		const

Find the bounding rect for the label. The coordinates of the rect are relative to spacing + ticklength from the backbone in direction of the tick.

Parámetros:

font	Font used for painting
value	Value

double QwtScaleDraw::labelRotation ( ) const

Devuelve:: the label rotation

Ver también:: setLabelRotation(), labelAlignment()

QSize QwtScaleDraw::labelSize	(	const QFont &	font,
		double	value
	)		const

Calculate the size that is needed to draw a label

Parámetros:

font	Label font
value	Value

int QwtScaleDraw::length ( void ) const

Devuelve:: the length of the backbone

Ver también:: setLength(), pos()

int QwtScaleDraw::maxLabelHeight ( const QFont & font ) const

Parámetros:

font Font

Devuelve:: the maximum height of a label

int QwtScaleDraw::maxLabelWidth ( const QFont & font ) const

Parámetros:

font Font

Devuelve:: the maximum width of a label

int QwtScaleDraw::minLabelDist ( const QFont & font ) const

Determine the minimum distance between two labels, that is necessary that the texts don't overlap.

Parámetros:

font Font

Devuelve:: The maximum width of a label

Ver también:: getBorderDistHint()

int QwtScaleDraw::minLength	(	const QPen &	pen,
		const QFont &	font
	)		const

Calculate the minimum length that is needed to draw the scale

Parámetros:

pen	Pen that is used for painting backbone and ticks
font	Font used for painting the labels

Ver también:: extent()

void QwtScaleDraw::move	(	int	x,
		int	y
	)		`[inline]`

void QwtScaleDraw::move ( const QPoint & pos )

Move the position of the scale.

The meaning of the parameter pos depends on the alignment:

QwtScaleDraw::LeftScale: The origin is the topmost point of the backbone. The backbone is a vertical line. Scale marks and labels are drawn at the left of the backbone.
QwtScaleDraw::RightScale: The origin is the topmost point of the backbone. The backbone is a vertical line. Scale marks and labels are drawn at the right of the backbone.
QwtScaleDraw::TopScale: The origin is the leftmost point of the backbone. The backbone is a horizontal line. Scale marks and labels are drawn above the backbone.
QwtScaleDraw::BottomScale: The origin is the leftmost point of the backbone. The backbone is a horizontal line Scale marks and labels are drawn below the backbone.

Parámetros:

pos	Origin of the scale

Ver también:: pos(), setLength()

QwtScaleDraw & QwtScaleDraw::operator= ( const QwtScaleDraw & other )

Assignment operator.

Qt::Orientation QwtScaleDraw::orientation ( ) const

Return the orientation

TopScale, BottomScale are horizontal (Qt::Horizontal) scales, LeftScale, RightScale are vertical (Qt::Vertical) scales.

Ver también:: alignment()

QPoint QwtScaleDraw::pos ( ) const

Devuelve:: Origin of the scale

Ver también:: move(), length()

void QwtScaleDraw::setAlignment ( Alignment align )

Set the alignment of the scale

The default alignment is QwtScaleDraw::BottomScale

Ver también:: alignment()

void QwtScaleDraw::setLabelAlignment ( int alignment )

Change the label flags.

Labels are aligned to the point ticklength + spacing away from the backbone.

The alignment is relative to the orientation of the label text. In case of an flags of 0 the label will be aligned depending on the orientation of the scale:

QwtScaleDraw::TopScale: Qt::AlignHCenter | Qt::AlignTop
QwtScaleDraw::BottomScale: Qt::AlignHCenter | Qt::AlignBottom
QwtScaleDraw::LeftScale: Qt::AlignLeft | Qt::AlignVCenter
QwtScaleDraw::RightScale: Qt::AlignRight | Qt::AlignVCenter

Changing the alignment is often necessary for rotated labels.

Parámetros:

alignment Or'd Qt::AlignmentFlags <see qnamespace.h>

Ver también:: setLabelRotation(), labelRotation(), labelAlignment()

Atención:: The various alignments might be confusing. The alignment of the label is not the alignment of the scale and is not the alignment of the flags (QwtText::flags()) returned from QwtAbstractScaleDraw::label().

void QwtScaleDraw::setLabelRotation ( double rotation )

Rotate all labels.

When changing the rotation, it might be necessary to adjust the label flags too. Finding a useful combination is often the result of try and error.

Parámetros:

rotation Angle in degrees. When changing the label rotation, the label flags often needs to be adjusted too.