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
o Legend
The item is represented on the legend.
o 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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Version 5.2.2 Mon Aug 1 2011 QwtPlotMarker(3)