Provided by: libqwt-doc_6.0.0-1.2_all 
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, UserStyle = 1000 }
Public Member Functions
QwtSymbol (Style=NoSymbol)
QwtSymbol (Style, const QBrush &, const QPen &, const QSize &)
QwtSymbol (const QwtSymbol &)
virtual ~QwtSymbol ()
QwtSymbol & operator= (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
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 (Stylestyle = 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::Stylestyle, 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, intnumPoints) 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 (intwidth, intheight = -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::Stylestyle) 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()
Author
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