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QwtPlotMarker(3) Qwt User's Guide QwtPlotMarker(3)

NAME

QwtPlotMarker -
A class for drawing markers.
 

SYNOPSIS

#include <qwt_plot_marker.h>
Inherits QwtPlotItem.

Public Types


enum ItemAttribute { Legend = 1, AutoScale = 2 }
 
enum LineStyle { NoLine, HLine, VLine, Cross }
 
enum RenderHint { RenderAntialiased = 1 }
 
enum RttiValues { Rtti_PlotItem = 0, Rtti_PlotGrid, Rtti_PlotScale, Rtti_PlotMarker, Rtti_PlotCurve, Rtti_PlotHistogram, Rtti_PlotSpectrogram, Rtti_PlotSVG, Rtti_PlotUserItem = 1000 }
 

Public Member Functions


void attach (QwtPlot *plot)
 
virtual QwtDoubleRect boundingRect () const
 
void detach ()
 
virtual void draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &) const
 
void hide ()
 
QwtDoubleRect invTransform (const QwtScaleMap &, const QwtScaleMap &, const QRect &) const
 
bool isVisible () const
 
virtual void itemChanged ()
 
QwtText label () const
 
Qt::Alignment labelAlignment () const
 
Qt::Orientation labelOrientation () const
 
virtual QWidget * legendItem () const
 
const QPen & linePen () const
 
LineStyle lineStyle () const
 
QRect paintRect (const QwtScaleMap &, const QwtScaleMap &) const
 
QwtPlot * plot () const
 
QwtPlotMarker ()
 
virtual int rtti () const
 
QwtDoubleRect scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
 
void setAxis (int xAxis, int yAxis)
 
void setItemAttribute (ItemAttribute, bool on=true)
 
void setLabel (const QwtText &)
 
void setLabelAlignment (Qt::Alignment)
 
void setLabelOrientation (Qt::Orientation)
 
void setLinePen (const QPen &p)
 
void setLineStyle (LineStyle st)
 
void setRenderHint (RenderHint, bool on=true)
 
void setSpacing (int)
 
void setSymbol (const QwtSymbol &s)
 
void setTitle (const QString &title)
 
void setTitle (const QwtText &title)
 
void setValue (double, double)
 
void setValue (const QwtDoublePoint &)
 
virtual void setVisible (bool)
 
void setXAxis (int axis)
 
void setXValue (double)
 
void setYAxis (int axis)
 
void setYValue (double)
 
void setZ (double z)
 
void show ()
 
int spacing () const
 
const QwtSymbol & symbol () const
 
bool testItemAttribute (ItemAttribute) const
 
bool testRenderHint (RenderHint) const
 
const QwtText & title () const
 
QRect transform (const QwtScaleMap &, const QwtScaleMap &, const QwtDoubleRect &) const
 
virtual void updateLegend (QwtLegend *) const
 
virtual void updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &)
 
QwtDoublePoint value () const
 
int xAxis () const
 
double xValue () const
 
int yAxis () const
 
double yValue () const
 
double z () const
 
virtual ~QwtPlotMarker ()
 

Protected Member Functions


void drawAt (QPainter *, const QRect &, const QPoint &) 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 QwtPlotMarker::setLabel(), a label can be assigned to the marker. The QwtPlotMarker::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 AlignLeft|AlignTop.

Member Enumeration Documentation

enum QwtPlotItem::ItemAttribute [inherited] Plot Item Attributes

•
Legend
 

The item is represented on the legend.
•
AutoScale
 

The boundingRect() of the item is included in the autoscaling calculation.
See also:
setItemAttribute(), testItemAttribute()
 

enum QwtPlotMarker::LineStyle Line styles.

See also:
setLineStyle(), lineStyle()
 

enum QwtPlotItem::RenderHint [inherited]

Render hints.

enum QwtPlotItem::RttiValues [inherited]

Runtime type information. RttiValues is used to cast plot items, without having to enable runtime type information of the compiler.

Constructor & Destructor Documentation

QwtPlotMarker::QwtPlotMarker () [explicit]

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

QwtPlotMarker::~QwtPlotMarker () [virtual]

Destructor.

Member Function Documentation

void QwtPlotItem::attach (QwtPlot *plot) [inherited]

Attach the item to a plot. This method will attach a QwtPlotItem to the QwtPlot argument. It will first detach the QwtPlotItem from any plot from a previous call to attach (if necessary). If a NULL argument is passed, it will detach from any QwtPlot it was attached to.
Parameters:
plot Plot widget
See also:
QwtPlotItem::detach()
 

QwtDoubleRect QwtPlotMarker::boundingRect () const [virtual] Returns:

An invalid bounding rect: QwtDoubleRect(1.0, 1.0, -2.0, -2.0)
 
Reimplemented from QwtPlotItem.

void QwtPlotItem::detach () [inline, inherited]

This method detaches a QwtPlotItem from any QwtPlot it has been associated with. detach() is equivalent to calling attach( NULL )
See also:
attach( QwtPlot* plot )
 

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

Parameters:
painter Painter
 
xMap x Scale Map
 
yMap y Scale Map
 
canvasRect Contents rect of the canvas in painter coordinates
 
Implements QwtPlotItem.

void QwtPlotMarker::drawAt (QPainter *painter, const QRect &canvasRect, const QPoint &pos) const [protected] Draw the marker at a specific position

Parameters:
painter Painter
 
canvasRect Contents rect of the canvas in painter coordinates
 
pos Position of the marker in painter coordinates
 

void QwtPlotItem::hide () [inherited]

Hide the item.

QwtDoubleRect QwtPlotItem::invTransform (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &rect) const [inherited] Transform a rectangle from paint to scale coordinates

Parameters:
xMap X map
 
yMap Y map
 
rect Rectangle in paint coordinates
Returns:
Rectangle in scale coordinates
See also:
transform()
 

bool QwtPlotItem::isVisible () const [inherited] Returns:

true if visible
See also:
setVisible(), show(), hide()
 

void QwtPlotItem::itemChanged () [virtual, inherited] Update the legend and call QwtPlot::autoRefresh for the parent plot.

See also:
updateLegend()
 

QwtText QwtPlotMarker::label () const Returns:

the label
See also:
setLabel()
 

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

the label alignment
See also:
setLabelAlignment(), setLabelOrientation()
 

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

the label orientation
See also:
setLabelOrientation(), labelAlignment()
 

QWidget * QwtPlotItem::legendItem () const [virtual, inherited]

Allocate the widget that represents the item on the legend. The default implementation is made for QwtPlotCurve and returns a QwtLegendItem(), but an item could be represented by any type of widget, by overloading legendItem() and updateLegend().
Returns:
QwtLegendItem()
See also:
updateLegend() QwtLegend()
 
Implements QwtLegendItemManager.

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

the line pen
See also:
setLinePen()
 

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

the line style
See also:
For a description of line styles, see QwtPlotMarker::setLineStyle()
 

QRect QwtPlotItem::paintRect (const QwtScaleMap &xMap, const QwtScaleMap &yMap) const [inherited]

Calculate the bounding paint rect of 2 maps. Parameters:
xMap X map
 
yMap X map
Returns:
Bounding rect of the scale maps
 

QwtPlot * QwtPlotItem::plot () const [inherited]

Return attached plot.

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

QwtPlotItem::Rtti_PlotMarker
 
Reimplemented from QwtPlotItem.

QwtDoubleRect QwtPlotItem::scaleRect (const QwtScaleMap &xMap, const QwtScaleMap &yMap) const [inherited]

Calculate the bounding scale rect of 2 maps. Parameters:
xMap X map
 
yMap X map
Returns:
Bounding rect of the scale maps
 

void QwtPlotItem::setAxis (intxAxis, intyAxis) [inherited] Set X and Y axis

The item will painted according to the coordinates its Axes.
Parameters:
xAxis X Axis
 
yAxis Y Axis
See also:
setXAxis(), setYAxis(), xAxis(), yAxis()
 

void QwtPlotItem::setItemAttribute (ItemAttributeattribute, boolon = true) [inherited] Toggle an item attribute

Parameters:
attribute Attribute type
 
on true/false
See also:
testItemAttribute(), ItemAttribute
 

void QwtPlotMarker::setLabel (const QwtText &label)

Set the label. Parameters:
label label text
See also:
label()
 

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:
align Alignment. A combination of AlignTop, AlignBottom, AlignLeft, AlignRight, AlignCenter, AlgnHCenter, AlignVCenter.
See also:
labelAlignment(), labelOrientation()
 

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:
orientation Orientation of the label
See also:
labelOrientation(), setLabelAlignment()
 

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

The width of non cosmetic pens is scaled according to the resolution of the paint device.
Parameters:
pen New pen
See also:
linePen(), QwtPainter::scaledPen()
 

void QwtPlotMarker::setLineStyle (QwtPlotMarker::LineStylest)

Set the line style. Parameters:
st Line style. Can be one of QwtPlotMarker::NoLine, HLine, VLine or Cross
See also:
lineStyle()
 

void QwtPlotItem::setRenderHint (RenderHinthint, boolon = true) [inherited] Toggle an render hint

Parameters:
hint Render hint
 
on true/false
See also:
testRenderHint(), RenderHint
 

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:
spacing Spacing
See also:
spacing(), setLabelAlignment()
 

void QwtPlotMarker::setSymbol (const QwtSymbol &s)

Assign a symbol. Parameters:
s New symbol
See also:
symbol()
 

void QwtPlotItem::setTitle (const QString &title) [inherited] Set a new title

Parameters:
title Title
See also:
title()
 

void QwtPlotItem::setTitle (const QwtText &title) [inherited] Set a new title

Parameters:
title Title
See also:
title()
 

void QwtPlotMarker::setValue (const QwtDoublePoint &pos)

Set Value.

void QwtPlotMarker::setValue (doublex, doubley)

Set Value.

void QwtPlotItem::setVisible (boolon) [virtual, inherited] Show/Hide the item

Parameters:
on Show if true, otherwise hide
See also:
isVisible(), show(), hide()
 

void QwtPlotItem::setXAxis (intaxis) [inherited] Set the X axis

The item will painted according to the coordinates its Axes.
Parameters:
axis X Axis
See also:
setAxis(), setYAxis(), xAxis()
 

void QwtPlotMarker::setXValue (doublex)

Set X Value.

void QwtPlotItem::setYAxis (intaxis) [inherited] Set the Y axis

The item will painted according to the coordinates its Axes.
Parameters:
axis Y Axis
See also:
setAxis(), setXAxis(), yAxis()
 

void QwtPlotMarker::setYValue (doubley)

Set Y Value.

void QwtPlotItem::setZ (doublez) [inherited]

Set the z value. Plot items are painted in increasing z-order.
Parameters:
z Z-value
See also:
z(), QwtPlotDict::itemList()
 

void QwtPlotItem::show () [inherited]

Show the item.

int QwtPlotMarker::spacing () const Returns:

the spacing
See also:
setSpacing()
 

const QwtSymbol & QwtPlotMarker::symbol () const Returns:

the symbol
See also:
setSymbol(), QwtSymbol
 

bool QwtPlotItem::testItemAttribute (ItemAttributeattribute) const [inherited] Test an item attribute

Parameters:
attribute Attribute type
Returns:
true/false
See also:
setItemAttribute(), ItemAttribute
 

bool QwtPlotItem::testRenderHint (RenderHinthint) const [inherited] Test a render hint

Parameters:
hint Render hint
Returns:
true/false
See also:
setRenderHint(), RenderHint
 

const QwtText & QwtPlotItem::title () const [inherited] Returns:

Title of the item
See also:
setTitle()
 

QRect QwtPlotItem::transform (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QwtDoubleRect &rect) const [inherited] Transform a rectangle

Parameters:
xMap X map
 
yMap Y map
 
rect Rectangle in scale coordinates
Returns:
Rectangle in paint coordinates
See also:
invTransform()
 

void QwtPlotItem::updateLegend (QwtLegend *legend) const [virtual, inherited]

Update the widget that represents the item on the legend. updateLegend() is called from itemChanged() to adopt the widget representing the item on the legend to its new configuration.
The default implementation is made for QwtPlotCurve and updates a QwtLegendItem(), but an item could be represented by any type of widget, by overloading legendItem() and updateLegend().
Parameters:
legend Legend
See also:
legendItem(), itemChanged(), QwtLegend()
 
Implements QwtLegendItemManager.
Reimplemented in QwtPlotCurve.

void QwtPlotItem::updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &) [virtual, inherited]

Update the item to changes of the axes scale division. Update the item, when the axes of plot have changed. The default implementation does nothing, but items that depend on the scale division (like QwtPlotGrid()) have to reimplement updateScaleDiv()
Parameters:
xScaleDiv Scale division of the x-axis
 
yScaleDiv Scale division of the y-axis
See also:
QwtPlot::updateAxes()
 
Reimplemented in QwtPlotGrid, and QwtPlotScaleItem.

QwtDoublePoint QwtPlotMarker::value () const

Return Value.

int QwtPlotItem::xAxis () const [inherited]

Return xAxis.

double QwtPlotMarker::xValue () const

Return x Value.

int QwtPlotItem::yAxis () const [inherited]

Return yAxis.

double QwtPlotMarker::yValue () const

Return y Value.

double QwtPlotItem::z () const [inherited] Plot items are painted in increasing z-order.

Returns:
setZ(), QwtPlotDict::itemList()
 
 

Author

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Mon Aug 1 2011 Version 5.2.2