# QwtPlotSvgItem Class Reference

A plot item, which displays data in Scalable Vector Graphics (SVG) format. More...

`#include <qwt_plot_svgitem.h>`

Inheritance diagram for QwtPlotSvgItem:
[legend]

List of all members.

## Public Types

enum | ItemAttribute { Legend = 1, AutoScale = 2 }
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 &rect) const
void | hide ()
QwtDoubleRect | invTransform (const QwtScaleMap &, const QwtScaleMap &, const QRect &) const
bool | isVisible () const
virtual void | itemChanged ()
virtual QWidget * | legendItem () const
bool | loadData (const QwtDoubleRect &, const QByteArray &)
bool | loadFile (const QwtDoubleRect &, const QString &fileName)
QRect | paintRect (const QwtScaleMap &, const QwtScaleMap &) const
QwtPlot * | plot () const
| QwtPlotSvgItem (const QwtText &title)
| QwtPlotSvgItem (const QString &title=QString::null)
virtual int | rtti () const
QwtDoubleRect | scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
void | setAxis (int xAxis, int yAxis)
void | setItemAttribute (ItemAttribute, bool on=true)
void | setRenderHint (RenderHint, bool on=true)
void | setTitle (const QString &title)
void | setTitle (const QwtText &title)
virtual void | setVisible (bool)
void | setXAxis (int axis)
void | setYAxis (int axis)
void | setZ (double z)
void | show ()
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 &)
int | xAxis () const
int | yAxis () const
double | z () const
virtual | ~QwtPlotSvgItem ()

## Protected Member Functions

void | render (QPainter *painter, const QwtDoubleRect &viewBox, const QRect &rect) const
QwtDoubleRect | viewBox (const QwtDoubleRect &area) const

## Detailed Description

A plot item, which displays data in Scalable Vector Graphics (SVG) format.

SVG images are often used to display maps

## 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 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

QwtPlotSvgItem::QwtPlotSvgItem | ( | const QString & | title = `QString::null` | ) | `[explicit]`

Constructor.

Sets the following item attributes:

- QwtPlotItem::AutoScale: true
- QwtPlotItem::Legend: false

Parameters:

  title | Title

QwtPlotSvgItem::QwtPlotSvgItem | ( | const QwtText & | title | ) | `[explicit]`

Constructor.

Sets the following item attributes:

- QwtPlotItem::AutoScale: true
- QwtPlotItem::Legend: false

Parameters:

  title | Title

QwtPlotSvgItem::~QwtPlotSvgItem | ( |  | ) | `[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 QwtPlotSvgItem::boundingRect | ( |  | ) | const`[virtual]`

Bounding rect of the item.

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 QwtPlotSvgItem::draw | ( | QPainter * | painter,
|  | const QwtScaleMap & | xMap,
|  | const QwtScaleMap & | yMap,
|  | const QRect & | canvasRect
| ) |  | const`[virtual]`

Draw the SVG item

Parameters:

  painter | Painter
  xMap | X-Scale Map
  yMap | Y-Scale Map
  canvasRect | Contents rect of the plot canvas

Implements QwtPlotItem.

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()

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.

bool QwtPlotSvgItem::loadData | ( | const QwtDoubleRect & | rect,
|  | const QByteArray & | data
| ) |  |

Load SVG data

Parameters:

  rect | Bounding rectangle
  data | in SVG format

Returns:
  true, if the SVG data could be loaded

bool QwtPlotSvgItem::loadFile | ( | const QwtDoubleRect & | rect,
|  | const QString & | fileName
| ) |  |

Load a SVG file

Parameters:

  rect | Bounding rectangle
  fileName | SVG file name

Returns:
  true, if the SVG file could be loaded

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.

void QwtPlotSvgItem::render | ( | QPainter * | painter,
|  | const QwtDoubleRect & | viewBox,
|  | const QRect & | rect
| ) |  | const`[protected]`

Render the SVG data

Parameters:

  painter | Painter
  viewBox | View Box, see QSvgRenderer::viewBox
  rect | Traget rectangle on the paint device

int QwtPlotSvgItem::rtti | ( |  | ) | const`[virtual]`

Returns:
  QwtPlotItem::Rtti_PlotSVG

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 | ( | int | xAxis,
|  | int | yAxis
| ) |  | `[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 | ( | ItemAttribute | attribute,
|  | bool | on = `true`
| ) |  | `[inherited]`

Toggle an item attribute

Parameters:

  attribute | Attribute type
  on | true/false

See also:
  testItemAttribute(), ItemAttribute

void QwtPlotItem::setRenderHint | ( | RenderHint | hint,
|  | bool | on = `true`
| ) |  | `[inherited]`

Toggle an render hint

Parameters:

  hint | Render hint
  on | true/false

See also:
  testRenderHint(), RenderHint

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 QwtPlotItem::setVisible | ( | bool | on | ) | `[virtual, inherited]`

Show/Hide the item

Parameters:

  on | Show if true, otherwise hide

See also:
  isVisible(), show(), hide()

void QwtPlotItem::setXAxis | ( | int | axis | ) | `[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 QwtPlotItem::setYAxis | ( | int | axis | ) | `[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 QwtPlotItem::setZ | ( | double | z | ) | `[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.

bool QwtPlotItem::testItemAttribute | ( | ItemAttribute | attribute | ) | const`[inherited]`

Test an item attribute

Parameters:

  attribute | Attribute type

Returns:
  true/false

See also:
  setItemAttribute(), ItemAttribute

bool QwtPlotItem::testRenderHint | ( | RenderHint | hint | ) | 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.

QwtDoubleRect QwtPlotSvgItem::viewBox | ( | const QwtDoubleRect & | rect | ) | const`[protected]`

Calculate the viewBox from an rect and boundingRect().

Parameters:

  rect | Rectangle in scale coordinates

Returns:
  viewBox View Box, see QSvgRenderer::viewBox

int QwtPlotItem::xAxis | ( |  | ) | const`[inherited]`

Return xAxis.

int QwtPlotItem::yAxis | ( |  | ) | const`[inherited]`

Return yAxis.

double QwtPlotItem::z | ( |  | ) | const`[inherited]`

Plot items are painted in increasing z-order.

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