Qwt User's Guide 6.0.0
|
A class for drawing markers. More...
#include <qwt_plot_marker.h>
Public Types | |
enum | LineStyle { NoLine, HLine, VLine, Cross } |
Public Member Functions | |
QwtPlotMarker () | |
virtual | ~QwtPlotMarker () |
virtual int | rtti () const |
double | xValue () const |
double | yValue () const |
QPointF | value () const |
void | setXValue (double) |
void | setYValue (double) |
void | setValue (double, double) |
void | setValue (const QPointF &) |
void | setLineStyle (LineStyle st) |
LineStyle | lineStyle () const |
void | setLinePen (const QPen &p) |
const QPen & | linePen () const |
void | setSymbol (const QwtSymbol *) |
const QwtSymbol * | symbol () const |
void | setLabel (const QwtText &) |
QwtText | label () const |
void | setLabelAlignment (Qt::Alignment) |
Qt::Alignment | labelAlignment () const |
void | setLabelOrientation (Qt::Orientation) |
Qt::Orientation | labelOrientation () const |
void | setSpacing (int) |
int | spacing () const |
virtual void | draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &) const |
virtual QRectF | boundingRect () const |
virtual void | updateLegend (QwtLegend *) const |
virtual void | drawLegendIdentifier (QPainter *, const QRectF &) const |
Protected Member Functions | |
virtual void | drawLines (QPainter *, const QRectF &, const QPointF &) const |
virtual void | drawLabel (QPainter *, const QRectF &, const QPointF &) const |
A class for drawing markers.
A marker can be a horizontal line, a vertical line, a symbol, a label or any combination of them, which can be drawn around a center point inside a bounding rectangle.
The QwtPlotMarker::setSymbol() member assigns a symbol to the marker. The symbol is drawn at the specified point.
With setLabel(), a label can be assigned to the marker. The setLabelAlignment() member specifies where the label is drawn. All the Align*-constants in Qt::AlignmentFlags (see Qt documentation) are valid. The interpretation of the alignment depends on the marker's line style. The alignment refers to the center point of the marker, which means, for example, that the label would be printed left above the center point if the alignment was set to Qt::AlignLeft | Qt::AlignTop.
Line styles.
QwtPlotMarker::QwtPlotMarker | ( | ) | [explicit] |
Sets alignment to Qt::AlignCenter, and style to QwtPlotMarker::NoLine.
QwtPlotMarker::~QwtPlotMarker | ( | ) | [virtual] |
Destructor.
QRectF QwtPlotMarker::boundingRect | ( | ) | const [virtual] |
Reimplemented from QwtPlotItem.
void QwtPlotMarker::draw | ( | QPainter * | painter, |
const QwtScaleMap & | xMap, | ||
const QwtScaleMap & | yMap, | ||
const QRectF & | canvasRect | ||
) | const [virtual] |
Draw the marker
painter | Painter |
xMap | x Scale Map |
yMap | y Scale Map |
canvasRect | Contents rect of the canvas in painter coordinates |
Implements QwtPlotItem.
void QwtPlotMarker::drawLabel | ( | QPainter * | painter, |
const QRectF & | canvasRect, | ||
const QPointF & | pos | ||
) | const [protected, virtual] |
Align and draw the text label of the marker
painter | Painter |
canvasRect | Contents rect of the canvas in painter coordinates |
pos | Position of the marker, translated into widget coordinates |
void QwtPlotMarker::drawLegendIdentifier | ( | QPainter * | painter, |
const QRectF & | rect | ||
) | const [virtual] |
Draw the identifier representing the marker on the legend.
painter | Painter |
rect | Bounding rectangle for the identifier |
Reimplemented from QwtLegendItemManager.
void QwtPlotMarker::drawLines | ( | QPainter * | painter, |
const QRectF & | canvasRect, | ||
const QPointF & | pos | ||
) | const [protected, virtual] |
Draw the lines marker
painter | Painter |
canvasRect | Contents rect of the canvas in painter coordinates |
pos | Position of the marker, translated into widget coordinates |
QwtText QwtPlotMarker::label | ( | ) | const |
Qt::Alignment QwtPlotMarker::labelAlignment | ( | ) | const |
Qt::Orientation QwtPlotMarker::labelOrientation | ( | ) | const |
const QPen & QwtPlotMarker::linePen | ( | ) | const |
QwtPlotMarker::LineStyle QwtPlotMarker::lineStyle | ( | ) | const |
int QwtPlotMarker::rtti | ( | ) | const [virtual] |
Reimplemented from QwtPlotItem.
void QwtPlotMarker::setLabel | ( | const QwtText & | label | ) |
void QwtPlotMarker::setLabelAlignment | ( | Qt::Alignment | align | ) |
Set the alignment of the label.
In case of QwtPlotMarker::HLine the alignment is relative to the y position of the marker, but the horizontal flags correspond to the canvas rectangle. In case of QwtPlotMarker::VLine the alignment is relative to the x position of the marker, but the vertical flags correspond to the canvas rectangle.
In all other styles the alignment is relative to the marker's position.
align | Alignment. |
void QwtPlotMarker::setLabelOrientation | ( | Qt::Orientation | orientation | ) |
Set the orientation of the label.
When orientation is Qt::Vertical the label is rotated by 90.0 degrees ( from bottom to top ).
orientation | Orientation of the label |
void QwtPlotMarker::setLinePen | ( | const QPen & | pen | ) |
void QwtPlotMarker::setLineStyle | ( | LineStyle | style | ) |
void QwtPlotMarker::setSpacing | ( | int | spacing | ) |
Set the spacing.
When the label is not centered on the marker position, the spacing is the distance between the position and the label.
spacing | Spacing |
void QwtPlotMarker::setSymbol | ( | const QwtSymbol * | symbol | ) |
void QwtPlotMarker::setValue | ( | const QPointF & | pos | ) |
Set Value.
void QwtPlotMarker::setValue | ( | double | x, |
double | y | ||
) |
Set Value.
void QwtPlotMarker::setXValue | ( | double | x | ) |
Set X Value.
void QwtPlotMarker::setYValue | ( | double | y | ) |
Set Y Value.
int QwtPlotMarker::spacing | ( | ) | const |
const QwtSymbol * QwtPlotMarker::symbol | ( | ) | const |
void QwtPlotMarker::updateLegend | ( | QwtLegend * | legend | ) | const [virtual] |
Update the widget that represents the item on the legend.
legend | Legend |
Reimplemented from QwtPlotItem.
QPointF QwtPlotMarker::value | ( | ) | const |
Return Value.
double QwtPlotMarker::xValue | ( | ) | const |
Return x Value.
double QwtPlotMarker::yValue | ( | ) | const |
Return y Value.