QwtSymbol(3)

NAME
QwtSymbol - A class for drawing symbols.

SYNOPSIS

#include <qwt_symbol.h>

  Public Types
enum Style { NoSymbol = -1, Ellipse, Rect, Diamond, Triangle, DTriangle, UTriangle, LTriangle, RTriangle, Cross, XCross, HLine, VLine, Star1, Star2, Hexagon, StyleCnt }

  Public Member Functions
QwtSymbol ()
QwtSymbol (Style st, const QBrush &bd, const QPen &pn, const QSize &s)
virtual ~QwtSymbol ()
bool operator!= (const QwtSymbol &) const
virtual bool operator== (const QwtSymbol &) const
virtual QwtSymbol * clone () const
void setSize (const QSize &s)
void setSize (int a, int b=-1)
void setBrush (const QBrush &b)
void setPen (const QPen &p)
void setStyle (Style s)
const QBrush & brush () const
const QPen & pen () const
const QSize & size () const
Style style () const
void draw (QPainter *p, const QPoint &pt) const
void draw (QPainter *p, int x, int y) const
virtual void draw (QPainter *p, const QRect &r) const

Detailed Description

A class for drawing symbols.

Member Enumeration Documentation

  enum QwtSymbol::Style

Style

See also:
    setStyle(), style()

Constructor & Destructor Documentation

  QwtSymbol::QwtSymbol ()

Default Constructor

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

  QwtSymbol::~QwtSymbol () [virtual]

Destructor.

Member Function Documentation

  const QBrush& QwtSymbol::brush () const [inline]

Return Brush.

  QwtSymbol * QwtSymbol::clone () const [virtual]

Allocate and return a symbol with the same attributes

Returns:
    Cloned symbol

  void QwtSymbol::draw (QPainter * painter, const QRect & r) const [virtual]

Draw the symbol into a bounding rectangle.

This function assumes that the painter has been initialized with brush and pen before. This allows a much more performant implementation when painting many symbols with the same brush and pen like in curves.

Parameters:
    painter Painter
    r Bounding rectangle

  void QwtSymbol::draw (QPainter * p, int x, int y) const

Draw the symbol at a point (x,y).

  void QwtSymbol::draw (QPainter * painter, const QPoint & pos) const

Draw the symbol at a specified point.

Parameters:
    painter Painter
    pos Center of the symbol

  bool QwtSymbol::operator!= (const QwtSymbol & other) const

!= operator

  bool QwtSymbol::operator== (const QwtSymbol & other) const [virtual]

== operator

  const QPen& QwtSymbol::pen () const [inline]

Return Pen.

  void QwtSymbol::setBrush (const QBrush & brush)

Assign a brush.

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

Parameters:
    brush Brush

  void QwtSymbol::setPen (const QPen & pen)

Assign a pen

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

The width of non cosmetic pens is scaled according to the resolution of the paint device.

Parameters:
    pen Pen

See also:
    pen(), setBrush(), QwtPainter::scaledPen()

  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)

  void QwtSymbol::setSize (const QSize & size)

Set the symbol's size

Parameters:
    size Size

  void QwtSymbol::setStyle (QwtSymbol::Style s)

Specify the symbol style.

The following styles are defined:

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

Parameters:
    s style

  const QSize& QwtSymbol::size () const [inline]

Return Size.

  Style QwtSymbol::style () const [inline]

Return Style.

Author

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