QwtSymbol Class Reference

A class for drawing symbols. More...

#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
QwtSymboloperator= (const QwtSymbol &)
bool operator== (const QwtSymbol &) const
const QPen & pen () const
 QwtSymbol (const QwtSymbol &)
 QwtSymbol (Style, const QBrush &, const QPen &, const QSize &)
 QwtSymbol (Style=NoSymbol)
void setBrush (const QBrush &b)
virtual void setColor (const QColor &)
void setPen (const QPen &)
void setSize (int width, int height=-1)
void setSize (const QSize &)
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

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 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

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

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 ( 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::setSize ( const QSize &  size  ) 

Set the symbol's size

Parameters:
size Size
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()


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