NAME¶

QwtPlotMarker - A class for drawing markers.

SYNOPSIS¶

#include <qwt_plot_marker.h> Inherits QwtPlotItem.

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

Detailed Description¶

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.

Member Enumeration Documentation¶

enum QwtPlotMarker::LineStyle Line styles.¶

See also: Enumerator:

NoLine

No line.

HLine

A horizontal line.

VLine

A vertical line.

Cross

A crosshair.

Constructor & Destructor Documentation¶

QwtPlotMarker::QwtPlotMarker () [explicit]¶

Sets alignment to Qt::AlignCenter, and style to QwtPlotMarker::NoLine.

QwtPlotMarker::~QwtPlotMarker () [virtual]¶

Destructor.

Member Function Documentation¶

QRectF QwtPlotMarker::boundingRect () const [virtual] Returns:¶

Reimplemented from QwtPlotItem.

void QwtPlotMarker::draw (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect) const [virtual] Draw the marker¶

Parameters: 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¶

Parameters: See also:

void QwtPlotMarker::drawLegendIdentifier (QPainter *painter, const QRectF &rect) const [virtual]¶

Draw the identifier representing the marker on the legend. Parameters: See also: Reimplemented from QwtLegendItemManager.

void QwtPlotMarker::drawLines (QPainter *painter, const QRectF &canvasRect, const QPointF &pos) const [protected, virtual] Draw the lines marker¶

Parameters: See also:

QwtText QwtPlotMarker::label () const Returns:¶

See also:

Qt::Alignment QwtPlotMarker::labelAlignment () const Returns:¶

See also:

Qt::Orientation QwtPlotMarker::labelOrientation () const Returns:¶

See also:

const QPen & QwtPlotMarker::linePen () const Returns:¶

See also:

QwtPlotMarker::LineStyle QwtPlotMarker::lineStyle () const Returns:¶

See also:

int QwtPlotMarker::rtti () const [virtual] Returns:¶

Reimplemented from QwtPlotItem.

void QwtPlotMarker::setLabel (const QwtText &label)¶

Set the label. Parameters: See also:

void QwtPlotMarker::setLabelAlignment (Qt::Alignmentalign)¶

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. Parameters: See also:

void QwtPlotMarker::setLabelOrientation (Qt::Orientationorientation)¶

Set the orientation of the label. When orientation is Qt::Vertical the label is rotated by 90.0 degrees ( from bottom to top ). Parameters: See also:

void QwtPlotMarker::setLinePen (const QPen &pen) Specify a pen for the line.¶

Parameters: See also:

void QwtPlotMarker::setLineStyle (LineStylestyle)¶

Set the line style. Parameters: See also:

void QwtPlotMarker::setSpacing (intspacing)¶

Set the spacing. When the label is not centered on the marker position, the spacing is the distance between the position and the label. Parameters: See also:

void QwtPlotMarker::setSymbol (const QwtSymbol *symbol)¶

Assign a symbol. Parameters: See also:

void QwtPlotMarker::setValue (const QPointF &pos)¶

Set Value.

void QwtPlotMarker::setValue (doublex, doubley)¶

Set Value.

void QwtPlotMarker::setXValue (doublex)¶

Set X Value.

void QwtPlotMarker::setYValue (doubley)¶

Set Y Value.

int QwtPlotMarker::spacing () const Returns:¶

See also:

const QwtSymbol * QwtPlotMarker::symbol () const Returns:¶

See also:

void QwtPlotMarker::updateLegend (QwtLegend *legend) const [virtual]¶

Update the widget that represents the item on the legend. Parameters: See also: Note: Reimplemented from QwtPlotItem.

QPointF QwtPlotMarker::value () const¶

Return Value.

double QwtPlotMarker::xValue () const¶

Return x Value.

double QwtPlotMarker::yValue () const¶

Return y Value.

Author¶

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