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,
  UserSymbol = 1000
}

Public Member Functions

 QwtSymbol (Style=NoSymbol)
 QwtSymbol (Style, const QBrush &, const QPen &, const QSize &)
 QwtSymbol (const QwtSymbol &)
virtual ~QwtSymbol ()
QwtSymboloperator= (const QwtSymbol &)
bool operator== (const QwtSymbol &) const
bool operator!= (const QwtSymbol &) const
void setSize (const QSize &)
void setSize (int width, int height=-1)
const QSize & size () const
virtual void setColor (const QColor &)
void setBrush (const QBrush &b)
const QBrush & brush () const
void setPen (const QPen &)
const QPen & pen () const
void setStyle (Style)
Style style () const
void drawSymbol (QPainter *, const QPointF &) const
void drawSymbols (QPainter *, const QPolygonF &) const
virtual QSize boundingSize () const

Protected Member Functions

virtual void drawSymbols (QPainter *, const QPointF *, int numPoints) const

Detailed Description

A class for drawing symbols.


Member Enumeration Documentation

Symbol Style

  • 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
  • UserSymbol
    Styles >= UserSymbol are reserved for derived classes of QwtSymbol that overload drawSymbols() with additional application specific symbol types.
See also:
setStyle(), style()

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()
Generated on Sun Nov 21 12:01:52 2010 for Qwt User's Guide by  doxygen 1.6.3