QwtPlotItem Class Reference

Inheritance diagram for QwtPlotItem:

Inheritance graph
[legend]
List of all members.

Detailed Description

Base class for items on the plot canvas.

Definition at line 30 of file qwt_plot_item.h.

Public Types

enum  RttiValues {
  Rtti_PlotItem = 0,
  Rtti_PlotGrid,
  Rtti_PlotMarker,
  Rtti_PlotCurve,
  Rtti_PlotHistogram,
  Rtti_PlotSpectrogram,
  Rtti_PlotSVG,
  Rtti_PlotUserItem = 1000
}
enum  ItemAttribute {
  Legend = 1,
  AutoScale = 2
}
enum  RenderHint { RenderAntialiased = 1 }

Public Member Functions

 QwtPlotItem (const QwtText &title=QwtText())
virtual ~QwtPlotItem ()
void attach (QwtPlot *plot)
void detach ()
QwtPlot * plot () const
void setTitle (const QString &title)
void setTitle (const QwtText &title)
const QwtText & title () const
virtual int rtti () const
void setItemAttribute (ItemAttribute, bool on=true)
bool testItemAttribute (ItemAttribute) const
void setRenderHint (RenderHint, bool on=true)
bool testRenderHint (RenderHint) const
double z () const
void setZ (double z)
void show ()
void hide ()
virtual void setVisible (bool)
bool isVisible () const
void setAxis (int xAxis, int yAxis)
void setXAxis (int axis)
int xAxis () const
void setYAxis (int axis)
int yAxis () const
virtual void itemChanged ()
virtual void draw (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &canvasRect) const =0
virtual QwtDoubleRect boundingRect () const
virtual void updateLegend (QwtLegend *) const
virtual void updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &)
virtual QWidget * legendItem () const
QwtDoubleRect scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
QRect paintRect (const QwtScaleMap &, const QwtScaleMap &) const
QRect transform (const QwtScaleMap &, const QwtScaleMap &, const QwtDoubleRect &) const
QwtDoubleRect invTransform (const QwtScaleMap &, const QwtScaleMap &, const QRect &) const

Constructor & Destructor Documentation

QwtPlotItem::QwtPlotItem (  const QwtText &  title = QwtText()  )  [explicit]
 

Constructor.

Definition at line 48 of file qwt_plot_item.cpp.

References title().

QwtPlotItem::~QwtPlotItem (   )  [virtual]
 

Destroy the QwtPlotItem.

Definition at line 55 of file qwt_plot_item.cpp.

References attach().

Member Function Documentation

void QwtPlotItem::attach (  QwtPlot *  plot  ) 
 

Attach the item to a plot

Definition at line 64 of file qwt_plot_item.cpp.

References legendItem(), and plot().

Referenced by ~QwtPlotItem().

QwtDoubleRect QwtPlotItem::boundingRect (   )  const [virtual]
 

Returns:
An invalid bounding rect: QwtDoubleRect(1.0, 1.0, -2.0, -2.0)

Reimplemented in QwtPlotCurve, QwtPlotMarker, QwtPlotSpectrogram, and QwtPlotSvgItem.

Definition at line 367 of file qwt_plot_item.cpp.

Referenced by QwtPlotRasterItem::draw(), QwtPlotCurve::maxXValue(), QwtPlotCurve::maxYValue(), QwtPlotCurve::minXValue(), and QwtPlotCurve::minYValue().

virtual void QwtPlotItem::draw (  QPainter *  painter,
const QwtScaleMap &  xMap,
const QwtScaleMap &  yMap,
const QRect &  canvasRect
)  const [pure virtual]
 

Draw the item.

Parameters:
painter Painter
xMap Maps x-values into pixel coordinates.
yMap Maps y-values into pixel coordinates.
canvasRect Contents rect of the canvas in painter coordinates

Implemented in QwtPlotCurve, QwtPlotGrid, QwtPlotMarker, QwtPlotRasterItem, QwtPlotSpectrogram, and QwtPlotSvgItem.

QwtDoubleRect QwtPlotItem::invTransform (  const QwtScaleMap &  xMap,
const QwtScaleMap &  yMap,
const QRect &  rect
)  const
 

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()

Definition at line 526 of file qwt_plot_item.cpp.

References QwtScaleMap::invTransform().

Referenced by QwtPlotSvgItem::draw(), QwtPlotSpectrogram::draw(), and QwtPlotRasterItem::draw().

bool QwtPlotItem::isVisible (   )  const
 

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

Definition at line 275 of file qwt_plot_item.cpp.

void QwtPlotItem::itemChanged (   )  [virtual]
 

Update the legend and call QwtPlot::autoRefresh for the parent plot.

See also:
updateLegend()

Definition at line 286 of file qwt_plot_item.cpp.

References updateLegend().

Referenced by QwtPlotGrid::enableX(), QwtPlotGrid::enableXMin(), QwtPlotGrid::enableY(), QwtPlotGrid::enableYMin(), QwtPlotSvgItem::loadData(), QwtPlotSvgItem::loadFile(), QwtPlotRasterItem::setAlpha(), setAxis(), QwtPlotCurve::setBaseline(), QwtPlotCurve::setBrush(), QwtPlotRasterItem::setCachePolicy(), QwtPlotSpectrogram::setColorMap(), QwtPlotSpectrogram::setConrecAttribute(), QwtPlotSpectrogram::setContourLevels(), QwtPlotCurve::setCurveAttribute(), QwtPlotCurve::setCurveFitter(), QwtPlotCurve::setCurveType(), QwtPlotSpectrogram::setData(), QwtPlotCurve::setData(), QwtPlotSpectrogram::setDefaultContourPen(), QwtPlotSpectrogram::setDisplayMode(), setItemAttribute(), QwtPlotMarker::setLabel(), QwtPlotMarker::setLinePen(), QwtPlotMarker::setLineStyle(), QwtPlotGrid::setMajPen(), QwtPlotGrid::setMinPen(), QwtPlotGrid::setPen(), QwtPlotCurve::setPen(), QwtPlotCurve::setRawData(), setRenderHint(), QwtPlotCurve::setStyle(), QwtPlotMarker::setSymbol(), QwtPlotCurve::setSymbol(), setTitle(), QwtPlotMarker::setValue(), setVisible(), setXAxis(), QwtPlotGrid::setXDiv(), setYAxis(), QwtPlotGrid::setYDiv(), and setZ().

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

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()

Definition at line 382 of file qwt_plot_item.cpp.

Referenced by attach(), updateLegend(), and QwtPlotCurve::updateLegend().

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

Calculate the bounding paint rect of 2 maps.

Parameters:
xMap X map
yMap X map
Returns:
Bounding rect of the scale maps

Definition at line 482 of file qwt_plot_item.cpp.

References QwtScaleMap::p1(), and QwtScaleMap::pDist().

Referenced by QwtPlotRasterItem::draw().

QwtPlot * QwtPlotItem::plot (   )  const
 

Return attached plot.

Definition at line 103 of file qwt_plot_item.cpp.

Referenced by attach(), QwtPlotCurve::closestPoint(), and QwtPlotCurve::draw().

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

Calculate the bounding scale rect of 2 maps.

Parameters:
xMap X map
yMap X map
Returns:
Bounding rect of the scale maps

Definition at line 467 of file qwt_plot_item.cpp.

References QwtScaleMap::s1(), and QwtScaleMap::sDist().

void QwtPlotItem::setAxis (  int  xAxis,
int  yAxis
) 
 

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()

Definition at line 307 of file qwt_plot_item.cpp.

References itemChanged().

void QwtPlotItem::setItemAttribute (  ItemAttribute  attribute,
bool  on = true
) 
 

Toggle an item attribute

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

Definition at line 184 of file qwt_plot_item.cpp.

References itemChanged().

Referenced by QwtPlotCurve::init(), and QwtPlotSpectrogram::QwtPlotSpectrogram().

void QwtPlotItem::setRenderHint (  RenderHint  hint,
bool  on = true
) 
 

Toggle an render hint

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

Definition at line 219 of file qwt_plot_item.cpp.

References itemChanged().

void QwtPlotItem::setTitle (  const QwtText &  title  ) 
 

Set a new title

Parameters:
title Title
See also:
title()

Definition at line 158 of file qwt_plot_item.cpp.

References itemChanged(), and title().

void QwtPlotItem::setTitle (  const QString &  title  ) 
 

Set a new title

Parameters:
title Title
See also:
title()

Definition at line 147 of file qwt_plot_item.cpp.

void QwtPlotItem::setVisible (  bool  on  )  [virtual]
 

Show/Hide the item

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

Definition at line 262 of file qwt_plot_item.cpp.

References itemChanged().

Referenced by hide(), and show().

void QwtPlotItem::setXAxis (  int  axis  ) 
 

Set the X axis

The item will painted according to the coordinates its Axes.

Parameters:
axis X Axis
See also:
setAxis(), setYAxis(), xAxis()

Definition at line 326 of file qwt_plot_item.cpp.

References itemChanged().

void QwtPlotItem::setYAxis (  int  axis  ) 
 

Set the Y axis

The item will painted according to the coordinates its Axes.

Parameters:
axis Y Axis
See also:
setAxis(), setXAxis(), yAxis()

Definition at line 343 of file qwt_plot_item.cpp.

References itemChanged().

void QwtPlotItem::setZ (  double  z  ) 
 

Set the z value.

Plot items are painted in increasing z-order.

Parameters:
z Z-value
See also:
z(), QwtPlotDict::itemList()

Definition at line 126 of file qwt_plot_item.cpp.

References itemChanged().

Referenced by QwtPlotCurve::init(), QwtPlotGrid::QwtPlotGrid(), QwtPlotMarker::QwtPlotMarker(), and QwtPlotSpectrogram::QwtPlotSpectrogram().

bool QwtPlotItem::testItemAttribute (  ItemAttribute  attribute  )  const
 

Test an item attribute

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

Definition at line 204 of file qwt_plot_item.cpp.

Referenced by updateLegend().

bool QwtPlotItem::testRenderHint (  RenderHint  hint  )  const
 

Test a render hint

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

Definition at line 239 of file qwt_plot_item.cpp.

const QwtText & QwtPlotItem::title (   )  const
 

Returns:
Title of the item
See also:
setTitle()

Definition at line 171 of file qwt_plot_item.cpp.

Referenced by QwtPlotItem(), setTitle(), and QwtPlotCurve::updateLegend().

QRect QwtPlotItem::transform (  const QwtScaleMap &  xMap,
const QwtScaleMap &  yMap,
const QwtDoubleRect &  rect
)  const
 

Transform a rectangle

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

Definition at line 501 of file qwt_plot_item.cpp.

References QwtScaleMap::transform().

Referenced by QwtPlotSvgItem::draw(), QwtPlotSpectrogram::draw(), QwtPlotRasterItem::draw(), and QwtPlotSpectrogram::renderImage().

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

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().

See also:
legendItem(), itemChanged(), QwtLegend()

Reimplemented in QwtPlotCurve.

Definition at line 399 of file qwt_plot_item.cpp.

References QwtLegend::find(), QwtLegend::insert(), QwtLegend::itemMode(), legendItem(), and testItemAttribute().

Referenced by itemChanged(), QwtLegend::setDisplayPolicy(), and QwtPlotCurve::updateLegend().

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

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.

Definition at line 454 of file qwt_plot_item.cpp.

int QwtPlotItem::xAxis (   )  const
 

Return xAxis.

Definition at line 353 of file qwt_plot_item.cpp.

Referenced by QwtPlotCurve::closestPoint().

int QwtPlotItem::yAxis (   )  const
 

Return yAxis.

Definition at line 359 of file qwt_plot_item.cpp.

Referenced by QwtPlotCurve::closestPoint().

double QwtPlotItem::z (   )  const
 

Plot items are painted in increasing z-order.

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

Definition at line 113 of file qwt_plot_item.cpp.

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