QwtSymbol Class Reference

#include <qwt_symbol.h>

List of all members.

Public Types
enum	Style {   NoSymbol = -1,   Ellipse,   Rect,   Diamond,   Triangle,   DTriangle,   UTriangle,   LTriangle,   RTriangle,   Cross,   XCross,   HLine,   VLine,   Star1,   Star2,   Hexagon,   UserStyle = 1000 }
Public Member Functions
virtual QSize	boundingSize () const
const QBrush &	brush () const
void	drawSymbol (QPainter *, const QPointF &) const
void	drawSymbols (QPainter *, const QPolygonF &) const
bool	operator!= (const QwtSymbol &) const
QwtSymbol &	operator= (const QwtSymbol &)
bool	operator== (const QwtSymbol &) const
const QPen &	pen () const
	QwtSymbol (Style=NoSymbol)
	QwtSymbol (Style, const QBrush &, const QPen &, const QSize &)
	QwtSymbol (const QwtSymbol &)
void	setBrush (const QBrush &b)
virtual void	setColor (const QColor &)
void	setPen (const QPen &)
void	setSize (const QSize &)
void	setSize (int width, int height=-1)
void	setStyle (Style)
const QSize &	size () const
Style	style () const
virtual	~QwtSymbol ()
Protected Member Functions
virtual void	drawSymbols (QPainter *, const QPointF *, int numPoints) const

---

Detailed Description

A class for drawing symbols.

---

Member Enumeration Documentation

enum QwtSymbol::Style

Symbol Style

See also:

setStyle(), style()

Enumerator:

NoSymbol	No Style. The symbol cannot be drawn.
Ellipse	Ellipse or circle.
Rect	Rectangle.
Diamond	Diamond.
Triangle	Triangle pointing upwards.
DTriangle	Triangle pointing downwards.
UTriangle	Triangle pointing upwards.
LTriangle	Triangle pointing left.
RTriangle	Triangle pointing right.
Cross	Cross (+)
XCross	Diagonal cross (X)
HLine	Horizontal line.
VLine	Vertical line.
Star1	X combined with +.
Star2	Six-pointed star.
Hexagon	Hexagon.
UserStyle	Styles >= QwtSymbol::UserSymbol are reserved for derived classes of QwtSymbol that overload drawSymbols() with additional application specific symbol types.

---

Constructor & Destructor Documentation

QwtSymbol::QwtSymbol

(

Style

style = NoSymbol

)

Default Constructor

Parameters:

style

Symbol Style

The symbol is constructed with gray interior, black outline with zero width, no size and style 'NoSymbol'.

QwtSymbol::QwtSymbol	(	QwtSymbol::Style	style,
		const QBrush &	brush,
		const QPen &	pen,
		const QSize &	size
	)

Constructor.

Parameters:

style	Symbol Style
brush	brush to fill the interior
pen	outline pen
size	size

See also:

setStyle(), setBrush(), setPen(), setSize()

QwtSymbol::QwtSymbol

(

const QwtSymbol &

other

)

Copy constructor.

Parameters:

other

Symbol

QwtSymbol::~QwtSymbol

(

)

[virtual]

Destructor.

---

Member Function Documentation

QSize QwtSymbol::boundingSize

(

)

const [virtual]

Returns:

Size of the bounding rectangle of a symbol

const QBrush & QwtSymbol::brush

(

)

const

Returns:

Brush

See also:

setBrush()

void QwtSymbol::drawSymbol	(	QPainter *	painter,
		const QPointF &	pos
	)		const [inline]

Draw the symbol at a specified position.

Parameters:

painter	Painter
pos	Position of the symbol in screen coordinates

void QwtSymbol::drawSymbols	(	QPainter *	painter,
		const QPolygonF &	points
	)		const [inline]

Draw symbols at the specified points.

Parameters:

painter	Painter
points	Positions of the symbols in screen coordinates

void QwtSymbol::drawSymbols	(	QPainter *	painter,
		const QPointF *	points,
		int	numPoints
	)		const [protected, virtual]

Draw an array of symbols

Painting several symbols is more effective than drawing symbols one by one, as a couple of layout calculations and setting of pen/brush can be done once for the complete array.

Parameters:

painter	Painter
points	Array of points
numPoints	Number of points

bool QwtSymbol::operator!=

(

const QwtSymbol &

other

)

const

Compare two symbols.

QwtSymbol & QwtSymbol::operator=

(

const QwtSymbol &

other

)

Assignment operator.

bool QwtSymbol::operator==

(

const QwtSymbol &

other

)

const

Compare two symbols.

const QPen & QwtSymbol::pen

(

)

const

Returns:

Pen

See also:

setPen(), brush()

void QwtSymbol::setBrush

(

const QBrush &

brush

)

Assign a brush.

The brush is used to draw the interior of the symbol.

Parameters:

brush

Brush

See also:

brush()

void QwtSymbol::setColor

(

const QColor &

color

)

[virtual]

Set the color of the symbol.

Change the color of the brush for symbol types with a filled area. For all other symbol types the color will be assigned to the pen.

Parameters:

color

Color

See also:

setBrush(), setPen(), brush(), pen()

void QwtSymbol::setPen

(

const QPen &

pen

)

Assign a pen

The pen is used to draw the symbol's outline.

Parameters:

pen

Pen

See also:

pen(), setBrush()

void QwtSymbol::setSize

(

const QSize &

size

)

Set the symbol's size

Parameters:

size

Size

See also:

size()

void QwtSymbol::setSize	(	int	width,
		int	height = -1
	)

Specify the symbol's size.

If the 'h' parameter is left out or less than 0, and the 'w' parameter is greater than or equal to 0, the symbol size will be set to (w,w).

Parameters:

width	Width
height	Height (defaults to -1)

See also:

size()

void QwtSymbol::setStyle

(

QwtSymbol::Style

style

)

Specify the symbol style

Parameters:

style

Style

See also:

style()

const QSize & QwtSymbol::size

(

)

const

Returns:

Size

See also:

setSize()

QwtSymbol::Style QwtSymbol::style

(

)

const

Returns:

Current symbol style

See also:

setStyle()