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Wt::Chart::WPieChart Class Reference

A pie chart. More...

#include <Wt/Chart/WPieChart>

Inheritance diagram for Wt::Chart::WPieChart:
Inheritance graph
[legend]

Public Member Functions

 WPieChart (WContainerWidget *parent=0)
 Creates a new pie chart.
 
void setLabelsColumn (int column)
 Sets the model column that holds the labels. More...
 
int labelsColumn () const
 Returns the model column used for the labels. More...
 
void setDataColumn (int modelColumn)
 Sets the model column that holds the data. More...
 
int dataColumn () const
 Returns the model column used for the data. More...
 
void setBrush (int modelRow, const WBrush &brush)
 Customizes the brush used for a pie segment. More...
 
WBrush brush (int modelRow) const
 Returns the brush used for a pie segment. More...
 
void setExplode (int modelRow, double factor)
 Sets the explosion factor for a pie segment. More...
 
double explode (int modelRow) const
 Returns the explosion factor for a segment. More...
 
void setPerspectiveEnabled (bool enabled, double height=1.0)
 Enables a 3D perspective effect on the pie. More...
 
bool isPerspectiveEnabled () const
 Returns whether a 3D effect is enabled. More...
 
void setShadowEnabled (bool enabled)
 Enables a shadow effect. More...
 
bool isShadowEnabled () const
 Returns whether a shadow effect is enabled. More...
 
void setStartAngle (double degrees)
 Sets the angle of the first segment. More...
 
double startAngle () const
 Returns the angle of the first segment. More...
 
void setAvoidLabelRendering (double percent)
 Sets the percentage value to avoid rendering of label texts. More...
 
double avoidLabelRendering () const
 Returns the percentage to avoid label rendering. More...
 
void setDisplayLabels (WFlags< LabelOption > options)
 Configures if and how labels should be displayed. More...
 
WFlags< LabelOptiondisplayLabels () const
 Returns options set for displaying labels. More...
 
WWidgetcreateLegendItemWidget (int index, WFlags< LabelOption > options)
 Creates a widget which renders the a legend item. More...
 
virtual void addDataPointArea (const WModelIndex &index, WAbstractArea *area) const
 Adds a data point area (used for displaying e.g. tooltips). More...
 
virtual void paint (WPainter &painter, const WRectF &rectangle=WRectF()) const
 Paint the chart in a rectangle of the given painter. More...
 
- Public Member Functions inherited from Wt::Chart::WAbstractChart
virtual ~WAbstractChart ()
 Destructor.
 
void setModel (WAbstractItemModel *model)
 Set the model. More...
 
WAbstractItemModelmodel () const
 Returns the model. More...
 
void setBackground (const WBrush &background)
 Sets a background for the chart. More...
 
const WBrushbackground () const
 Returns the background of the chart. More...
 
void setPalette (WChartPalette *palette)
 Set a palette for the chart. More...
 
WChartPalettepalette () const
 Returns the palette for the chart. More...
 
void setPlotAreaPadding (int padding, WFlags< Side > sides=All)
 Set an internal margin for the main plot area. More...
 
int plotAreaPadding (Side side) const
 Returns the internal margin for the main plot area. More...
 
void setTitle (const WString &title)
 Set a chart title. More...
 
const WStringtitle () const
 Return the chart title. More...
 
void setTitleFont (const WFont &titleFont)
 Set the font for the chart title. More...
 
const WFonttitleFont () const
 Returns the font for the chart title. More...
 
- Public Member Functions inherited from Wt::WPaintedWidget
 WPaintedWidget (WContainerWidget *parent=0)
 Create a new painted widget.
 
 ~WPaintedWidget ()
 Destructor.
 
void setPreferredMethod (Method method)
 Sets the preferred rendering method. More...
 
Method preferredMethod () const
 Returns the preferred rendering method. More...
 
void update (WFlags< PaintFlag > flags=0)
 Lets the widget repaint itself. More...
 
virtual void resize (const WLength &width, const WLength &height)
 Resizes the widget. More...
 
void addArea (WAbstractArea *area)
 Adds an interactive area. More...
 
void insertArea (int index, WAbstractArea *area)
 Inserts an interactive area. More...
 
void removeArea (WAbstractArea *area)
 Removes an interactive area. More...
 
WAbstractAreaarea (int index) const
 Returns the interactive area at the given index. More...
 
const std::vector
< WAbstractArea * > 
areas () const
 Returns the interactive areas set for this widget. More...
 
- Public Member Functions inherited from Wt::WInteractWidget
 WInteractWidget (WContainerWidget *parent=0)
 Create an InteractWidget with optional parent.
 
EventSignal< WKeyEvent > & keyWentDown ()
 Event signal emitted when a keyboard key is pushed down. More...
 
EventSignal< WKeyEvent > & keyPressed ()
 Event signal emitted when a "character" was entered. More...
 
EventSignal< WKeyEvent > & keyWentUp ()
 Event signal emitted when a keyboard key is released. More...
 
EventSignalenterPressed ()
 Event signal emitted when enter was pressed. More...
 
EventSignalescapePressed ()
 Event signal emitted when escape was pressed. More...
 
EventSignal< WMouseEvent > & clicked ()
 Event signal emitted when a mouse key was clicked on this widget. More...
 
EventSignal< WMouseEvent > & doubleClicked ()
 Event signal emitted when a mouse key was double clicked on this widget. More...
 
EventSignal< WMouseEvent > & mouseWentDown ()
 Event signal emitted when a mouse key was pushed down on this widget. More...
 
EventSignal< WMouseEvent > & mouseWentUp ()
 Event signal emitted when a mouse key was released on this widget. More...
 
EventSignal< WMouseEvent > & mouseWentOut ()
 Event signal emitted when the mouse went out of this widget. More...
 
EventSignal< WMouseEvent > & mouseWentOver ()
 Event signal emitted when the mouse entered this widget. More...
 
EventSignal< WMouseEvent > & mouseMoved ()
 Event signal emitted when the mouse moved over this widget. More...
 
EventSignal< WMouseEvent > & mouseDragged ()
 Event signal emitted when the mouse is dragged over this widget. More...
 
EventSignal< WMouseEvent > & mouseWheel ()
 Event signal emitted when the mouse scroll wheel was used. More...
 
EventSignal< WTouchEvent > & touchStarted ()
 Event signal emitted when a finger is placed on the screen. More...
 
EventSignal< WTouchEvent > & touchEnded ()
 Event signal emitted when a finger is removed from the screen. More...
 
EventSignal< WTouchEvent > & touchMoved ()
 Event signal emitted when a finger, which is already placed on the screen, is moved across the screen. More...
 
EventSignal< WGestureEvent > & gestureStarted ()
 Event signal emitted when a gesture is started. More...
 
EventSignal< WGestureEvent > & gestureChanged ()
 Event signal emitted when a gesture is changed. More...
 
EventSignal< WGestureEvent > & gestureEnded ()
 Event signal emitted when a gesture is ended. More...
 
void setDraggable (const std::string &mimeType, WWidget *dragWidget=0, bool isDragWidgetOnly=false, WObject *sourceWidget=0)
 Configure dragging for drag and drop. More...
 
void setMouseOverDelay (int delay)
 Sets a delay for the mouse over event. More...
 
int mouseOverDelay () const
 Returns the mouse over signal delay. More...
 
virtual void load ()
 Loads content just before the widget is used. More...
 
virtual bool isEnabled () const
 Returns whether the widget is enabled. More...
 
- Public Member Functions inherited from Wt::WWebWidget
 WWebWidget (WContainerWidget *parent=0)
 Construct a WebWidget with a given parent. More...
 
virtual void setPositionScheme (PositionScheme scheme)
 Sets the CSS position scheme. More...
 
virtual PositionScheme positionScheme () const
 Returns the CSS position scheme. More...
 
virtual void setOffsets (const WLength &offset, WFlags< Side > sides=All)
 Sets CSS offsets for a non-statically positioned widget. More...
 
virtual WLength offset (Side s) const
 Returns a CSS offset. More...
 
virtual WLength width () const
 Returns the width. More...
 
virtual WLength height () const
 Returns the height. More...
 
virtual void setMinimumSize (const WLength &width, const WLength &height)
 Sets a minimum size. More...
 
virtual WLength minimumWidth () const
 Returns the minimum width. More...
 
virtual WLength minimumHeight () const
 Returns the minimum height. More...
 
virtual void setMaximumSize (const WLength &width, const WLength &height)
 Sets a maximum size. More...
 
virtual WLength maximumWidth () const
 Returns the maximum width. More...
 
virtual WLength maximumHeight () const
 Returns the maximum height. More...
 
virtual void setLineHeight (const WLength &height)
 Sets the CSS line height for contained text.
 
virtual WLength lineHeight () const
 Returns the CSS line height for contained text. More...
 
virtual void setFloatSide (Side s)
 Specifies a CSS float side. More...
 
virtual Side floatSide () const
 Returns the CSS float side. More...
 
virtual void setClearSides (WFlags< Side > sides)
 Sets the sides that should be cleared of floats. More...
 
virtual WFlags< SideclearSides () const
 Returns the sides that should remain empty. More...
 
virtual void setMargin (const WLength &margin, WFlags< Side > sides=All)
 Sets CSS margins around the widget. More...
 
virtual WLength margin (Side side) const
 Returns a CSS margin set. More...
 
virtual void setHiddenKeepsGeometry (bool enabled)
 Sets whether the widget keeps its geometry when hidden. More...
 
virtual bool hiddenKeepsGeometry () const
 Returns whether the widget keeps its geometry when hidden. More...
 
virtual void setHidden (bool hidden, const WAnimation &animation=WAnimation())
 Hides or shows the widget. More...
 
virtual bool isHidden () const
 Returns whether the widget is set hidden. More...
 
virtual bool isVisible () const
 Returns whether the widget is visible. More...
 
virtual void setDisabled (bool disabled)
 Sets whether the widget is disabled. More...
 
virtual bool isDisabled () const
 Returns whether the widget is set disabled. More...
 
virtual void setPopup (bool popup)
 Lets the widget overlay over other sibling widgets. More...
 
virtual bool isPopup () const
 Returns whether the widget is overlayed. More...
 
virtual void setInline (bool isInline)
 Sets whether the widget is displayed inline or as a block. More...
 
virtual bool isInline () const
 Returns whether the widget is displayed inline or as block. More...
 
virtual void setDecorationStyle (const WCssDecorationStyle &style)
 Sets a CSS decoration style. More...
 
virtual WCssDecorationStyledecorationStyle ()
 Returns the decoration style of this widget. More...
 
virtual void setStyleClass (const WString &styleClass)
 Sets (one or more) CSS style classes. More...
 
virtual WString styleClass () const
 Returns the CSS style class. More...
 
virtual void addStyleClass (const WString &styleClass, bool force=false)
 Adds a CSS style class. More...
 
virtual void removeStyleClass (const WString &styleClass, bool force=false)
 Removes a CSS style class. More...
 
virtual bool hasStyleClass (const WString &styleClass) const
 Returns whether the widget has a style class.
 
virtual void setVerticalAlignment (AlignmentFlag alignment, const WLength &length=WLength())
 Sets the vertical alignment. More...
 
virtual AlignmentFlag verticalAlignment () const
 Returns the vertical alignment. More...
 
virtual WLength verticalAlignmentLength () const
 Returns the fixed vertical alignment that was set. More...
 
virtual void setToolTip (const WString &text, TextFormat textFormat=PlainText)
 Sets a tooltip. More...
 
virtual const WStringtoolTip () const
 Returns the tooltip.
 
virtual void refresh ()
 Refresh the widget. More...
 
virtual void setAttributeValue (const std::string &name, const WString &value)
 Sets an attribute value. More...
 
virtual WString attributeValue (const std::string &name) const
 Returns an attribute value. More...
 
virtual void setJavaScriptMember (const std::string &name, const std::string &value)
 Sets a JavaScript member. More...
 
virtual std::string javaScriptMember (const std::string &name) const
 Returns the value of a JavaScript member. More...
 
virtual void callJavaScriptMember (const std::string &name, const std::string &args)
 Calls a JavaScript member. More...
 
virtual bool loaded () const
 Returns whether this widget has been loaded. More...
 
virtual void setTabIndex (int index)
 Sets the tab index. More...
 
virtual int tabIndex () const
 Returns the tab index. More...
 
virtual void setId (const std::string &id)
 Sets the CSS Id. More...
 
virtual WWidgetfind (const std::string &name)
 Finds a descendent widget by name. More...
 
virtual void setSelectable (bool selectable)
 Sets as selectable. More...
 
virtual void doJavaScript (const std::string &javascript)
 Executes the given JavaScript statements when the widget is rendered or updated. More...
 
virtual const std::string id () const
 Returns the (unique) identifier for this object. More...
 
void setLoadLaterWhenInvisible (bool)
 Change the way the widget is loaded when invisible. More...
 
const std::vector< WWidget * > & children () const
 Returns contained widgets. More...
 
SignalchildrenChanged ()
 Signal emitted when children have been added or removed. More...
 
- Public Member Functions inherited from Wt::WWidget
virtual ~WWidget ()
 Destructor. More...
 
WWidgetparent () const
 Returns the parent widget. More...
 
void setWidth (const WLength &width)
 Sets the width. More...
 
void setHeight (const WLength &height)
 Sets the height. More...
 
virtual void positionAt (const WWidget *widget, Orientation orientation=Vertical)
 Positions a widget next to another widget. More...
 
virtual void toggleStyleClass (const WString &styleClass, bool add, bool force=false)
 Toggles a CSS style class.
 
std::string jsRef () const
 Returns a JavaScript expression to the corresponding DOM node. More...
 
virtual void acceptDrops (const std::string &mimeType, const WString &hoverStyleClass=WString())
 Sets a mime type to be accepted for dropping. More...
 
virtual void stopAcceptDrops (const std::string &mimeType)
 Indicates that a mime type is no longer accepted for dropping. More...
 
virtual void htmlText (std::ostream &out)
 Streams the (X)HTML representation. More...
 
bool isRendered () const
 Returns whether the widget is rendered. More...
 
void hide ()
 Hides the widget. More...
 
void animateHide (const WAnimation &animation)
 Hides the widget using an animation. More...
 
void show ()
 Shows the widget. More...
 
void animateShow (const WAnimation &animation)
 Shows the widget using an animation. More...
 
void enable ()
 Enables the widget. More...
 
void disable ()
 Disable thes widget. More...
 
bool layoutSizeAware () const
 Returns whether the widget is layout size aware. More...
 
- Public Member Functions inherited from Wt::WObject
 WObject (WObject *parent=0)
 Create a WObject with a given parent object. More...
 
virtual ~WObject ()
 Destructor. More...
 
void setObjectName (const std::string &name)
 Sets an object name. More...
 
virtual std::string objectName () const
 Returns the object name. More...
 
void resetLearnedSlots ()
 Resets learned stateless slot implementations. More...
 
template<class T >
void resetLearnedSlot (void(T::*method)())
 Resets a learned stateless slot implementation. More...
 
template<class T >
WStatelessSlot * implementStateless (void(T::*method)())
 Declares a slot to be stateless and learn client-side behaviour on first invocation. More...
 
template<class T >
WStatelessSlot * implementStateless (void(T::*method)(), void(T::*undoMethod)())
 Declares a slot to be stateless and learn client-side behaviour in advance. More...
 
template<class T >
WStatelessSlot * implementJavaScript (void(T::*method)(), const std::string &jsCode)
 Provides a JavaScript implementation for a method. More...
 
void addChild (WObject *child)
 Adds a child object. More...
 
const std::vector< WObject * > & children () const
 Returns the children.
 
WObjectparent () const
 Returns the parent object.
 

Protected Member Functions

void paintEvent (Wt::WPaintDevice *paintDevice)
 Paints the widget. More...
 

Private Member Functions

virtual void modelChanged ()
 Method called whenever the entire model was changed. More...
 
virtual void modelReset ()
 Method called whenever the entire model was reset. More...
 
virtual void modelColumnsInserted (const WModelIndex &parent, int start, int end)
 Method called when colums have been inserted in the model. More...
 
virtual void modelColumnsRemoved (const WModelIndex &parent, int start, int end)
 Method called when colums have been removed from the model. More...
 
virtual void modelRowsInserted (const WModelIndex &parent, int start, int end)
 Method called when rows have been inserted from the model. More...
 
virtual void modelRowsRemoved (const WModelIndex &parent, int start, int end)
 Method called when rows have been removed from the model. More...
 
virtual void modelDataChanged (const WModelIndex &topLeft, const WModelIndex &bottomRight)
 Method called when data has been changed in the model. More...
 

Additional Inherited Members

- Public Types inherited from Wt::WPaintedWidget
enum  Method { InlineSvgVml, HtmlCanvas, PngImage }
 Enumeration that indicates a rendering method. More...
 
- Static Public Member Functions inherited from Wt::WWebWidget
static WString escapeText (const WString &text, bool newlinesToo=false)
 Escape HTML control characters in the text, to display literally (deprecated). More...
 
static std::string & escapeText (std::string &text, bool newlinestoo=false)
 Escape HTML control characters in the text, to display literally (deprecated). More...
 
static bool removeScript (WString &text)
 Remove tags/attributes from text that are not passive (deprecated). More...
 
static std::string jsStringLiteral (const std::string &v, char delimiter= '\'')
 Turn a UTF8 encoded string into a JavaScript string literal. More...
 
- Static Protected Member Functions inherited from Wt::WObject
static WObjectsender ()
 Returns the sender of the current slot call. More...
 

Detailed Description

A pie chart.

A pie chart renders a single data series as segments of a circle, so that the area of each segment is proportional to the value in the data series.

To use a pie chart, you need to set a model using setModel(), and use setLabelsColumn() and setDataColumn() to specify the model column that contains the category labels and data.

The pie chart may be customized visually by enabling a 3D effect (setPerspectiveEnabled()), or by specifying the angle of the first segment. One or more segments may be exploded, which seperates the segment from the rest of the pie chart, using setExplode().

The segments may be labeled in various ways using setDisplayLabels().

CSS

Styling through CSS is not applicable.

ChartWPieChart-1.png
Example of a pie chart
See Also
WCartesianChart

Member Function Documentation

void Wt::Chart::WPieChart::addDataPointArea ( const WModelIndex index,
WAbstractArea area 
) const
virtual

Adds a data point area (used for displaying e.g. tooltips).

You may want to specialize this is if you wish to modify (or delete) the area.

Note
Currently, an area is only created if the ToolTipRole data at the data point is not empty.
double Wt::Chart::WPieChart::avoidLabelRendering ( ) const

Returns the percentage to avoid label rendering.

See Also
setAvoidLabelRendering(double)
WBrush Wt::Chart::WPieChart::brush ( int  modelRow) const

Returns the brush used for a pie segment.

See Also
setBrush(int, const WBrush&)
WWidget * Wt::Chart::WPieChart::createLegendItemWidget ( int  index,
WFlags< LabelOption options 
)

Creates a widget which renders the a legend item.

Depending on the passed LabelOption flags, the legend item widget, will contain a text (with or without the percentage) and/or a span with the segment's color.

int Wt::Chart::WPieChart::dataColumn ( ) const

Returns the model column used for the data.

See Also
setDataColumn(int)
WFlags<LabelOption> Wt::Chart::WPieChart::displayLabels ( ) const

Returns options set for displaying labels.

See Also
WPieChart::setDisplayLabels()
double Wt::Chart::WPieChart::explode ( int  modelRow) const

Returns the explosion factor for a segment.

See Also
setExplode(int, double)
bool Wt::Chart::WPieChart::isPerspectiveEnabled ( ) const

Returns whether a 3D effect is enabled.

See Also
setPerspectiveEnabled(bool, double)
bool Wt::Chart::WPieChart::isShadowEnabled ( ) const

Returns whether a shadow effect is enabled.

See Also
setShadowEnabled()
int Wt::Chart::WPieChart::labelsColumn ( ) const

Returns the model column used for the labels.

See Also
setLabelsColumn(int)
void Wt::Chart::WPieChart::modelChanged ( )
privatevirtual

Method called whenever the entire model was changed.

See Also
setModel(WAbstractItemModel *)

Reimplemented from Wt::Chart::WAbstractChart.

void Wt::Chart::WPieChart::modelColumnsInserted ( const WModelIndex parent,
int  start,
int  end 
)
privatevirtual

Method called when colums have been inserted in the model.

See Also
WAbstractItemModel::columnsInserted

Implements Wt::Chart::WAbstractChart.

void Wt::Chart::WPieChart::modelColumnsRemoved ( const WModelIndex parent,
int  start,
int  end 
)
privatevirtual

Method called when colums have been removed from the model.

See Also
WAbstractItemModel::columnsRemoved

Implements Wt::Chart::WAbstractChart.

void Wt::Chart::WPieChart::modelDataChanged ( const WModelIndex topLeft,
const WModelIndex bottomRight 
)
privatevirtual

Method called when data has been changed in the model.

See Also
WAbstractItemModel::dataChanged

Implements Wt::Chart::WAbstractChart.

void Wt::Chart::WPieChart::modelReset ( )
privatevirtual

Method called whenever the entire model was reset.

Bound to the WAbstractItemModel::modelReset() and WAbstractItemModel::layoutChanged() signals.

Reimplemented from Wt::Chart::WAbstractChart.

void Wt::Chart::WPieChart::modelRowsInserted ( const WModelIndex parent,
int  start,
int  end 
)
privatevirtual

Method called when rows have been inserted from the model.

See Also
WAbstractItemModel::rowsInserted

Implements Wt::Chart::WAbstractChart.

void Wt::Chart::WPieChart::modelRowsRemoved ( const WModelIndex parent,
int  start,
int  end 
)
privatevirtual

Method called when rows have been removed from the model.

See Also
WAbstractItemModel::rowsRemoved

Implements Wt::Chart::WAbstractChart.

void Wt::Chart::WPieChart::paint ( WPainter painter,
const WRectF rectangle = WRectF() 
) const
virtual

Paint the chart in a rectangle of the given painter.

Paints the chart inside the painter, in the area indicated by rectangle. When rectangle is a null rectangle, the entire painter window is used.

Implements Wt::Chart::WAbstractChart.

void Wt::Chart::WPieChart::paintEvent ( Wt::WPaintDevice paintDevice)
protectedvirtual

Paints the widget.

You should reimplement this method to paint the contents of the widget, using the given paintDevice.

Implements Wt::WPaintedWidget.

void Wt::Chart::WPieChart::setAvoidLabelRendering ( double  percent)

Sets the percentage value to avoid rendering of label texts.

The default value is 0 percent.

void Wt::Chart::WPieChart::setBrush ( int  modelRow,
const WBrush brush 
)

Customizes the brush used for a pie segment.

By default, the brush is taken from the palette(). You can use this method to override the palette's brush for a particular modelRow.

See Also
setPalette(WChartPalette *)
void Wt::Chart::WPieChart::setDataColumn ( int  modelColumn)

Sets the model column that holds the data.

The data column should contain data that can be converted to a number, but should not necessarily be of a number type, see also asNumber(const boost::any&).

The default value is -1 (not defined).

See Also
setModel(WAbstractItemModel *), setLabelsColumn(int)
void Wt::Chart::WPieChart::setDisplayLabels ( WFlags< LabelOption options)

Configures if and how labels should be displayed.

The options must be the logical OR of a placement option (Inside or Outside) and TextLabel and/or TextPercentage. If both TextLabel and TextPercentage are specified, then these are combined as "<label>: <percentage>".

The default value is NoLabels.

void Wt::Chart::WPieChart::setExplode ( int  modelRow,
double  factor 
)

Sets the explosion factor for a pie segment.

Separates the segment corresponding to model row modelRow from the rest of the pie. The factor is a positive number that represents the distance from the center as a fraction of the pie radius. Thus, 0 corresponds to no separation, and 0.1 to a 10% separation, and 1 to a separation where the segment tip is on the outer perimeter of the pie.

The default value is 0.

void Wt::Chart::WPieChart::setLabelsColumn ( int  column)

Sets the model column that holds the labels.

The labels are used only when setDisplayLabels() is called with the TextLabel option.

The default value is -1 (not defined).

See Also
setModel(WAbstractItemModel *), setDisplayLabels(), setDataColumn(int)
void Wt::Chart::WPieChart::setPerspectiveEnabled ( bool  enabled,
double  height = 1.0 
)

Enables a 3D perspective effect on the pie.

A 3D perspective effect is added, which may be customized by specifying the simulated height of the pie. The height is defined as a fraction of the pie radius.

The default value is false.

void Wt::Chart::WPieChart::setShadowEnabled ( bool  enabled)

Enables a shadow effect.

A soft shadow effect is added.

The default value is false.

void Wt::Chart::WPieChart::setStartAngle ( double  degrees)

Sets the angle of the first segment.

The default value is 45 degrees.

double Wt::Chart::WPieChart::startAngle ( ) const

Returns the angle of the first segment.

See Also
setStartAngle(double)

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