Wt  4.0.2
Public Member Functions | List of all members
Wt::Chart::WChartPalette Class Referenceabstract

Abstract base class for styling rendered data series in charts. More...

#include <Wt/Chart/WChartPalette.h>

Inheritance diagram for Wt::Chart::WChartPalette:
Inheritance graph
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Public Member Functions

virtual ~WChartPalette ()
 Destructor.
 
virtual WBrush brush (int index) const =0
 Returns a brush from the palette. More...
 
virtual WPen borderPen (int index) const =0
 Returns a border pen from the palette. More...
 
virtual WPen strokePen (int index) const =0
 Returns a stroke pen from the palette. More...
 
virtual WColor fontColor (int index) const =0
 Returns a font color from the palette. More...
 

Detailed Description

Abstract base class for styling rendered data series in charts.

This class provides an interface for a palette which sets strokes and fill strokes for data in a chart. A palette is an ordered list of styles, which is indexed by the chart to get a suitable style for a particular series (in case of WCartesianChart) or data row (in case of WPieChart). Each style is defined by a brush, two pen styles (one for borders, and one for plain lines), and a font color that is appropriate for drawing text within the brushed area.

To use a custom palette, you should reimplement this class, and then use WAbstractChart::setPalette() to use an instance of the palette.

Member Function Documentation

virtual WPen Wt::Chart::WChartPalette::borderPen ( int  index) const
pure virtual

Returns a border pen from the palette.

Returns the pen for stroking borders around an area filled using the brush at the same index.

See also
strokePen(), brush()

Implemented in Wt::Chart::WStandardPalette.

virtual WBrush Wt::Chart::WChartPalette::brush ( int  index) const
pure virtual

Returns a brush from the palette.

Returns the brush for the style with given index.

Implemented in Wt::Chart::WStandardPalette.

virtual WColor Wt::Chart::WChartPalette::fontColor ( int  index) const
pure virtual

Returns a font color from the palette.

Returns a font color suitable for rendering text in the area filled with the brush at the same index.

See also
brush()

Implemented in Wt::Chart::WStandardPalette.

virtual WPen Wt::Chart::WChartPalette::strokePen ( int  index) const
pure virtual

Returns a stroke pen from the palette.

Returns the pen for stroking lines for the style with given index.

See also
strokePen()

Implemented in Wt::Chart::WStandardPalette.


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