Subtitle

A subtitle is a second title placed under the main title, by default.

To get, change and apply own properties, you can invoke the set and get methods, as following:

// sets the text of subtitle
chart.getOptions().getSubtitle().setText("My subtitle of chart");
// enables the subtitle and setting to use red color for text
chart.getOptions().getSubtitle().setDisplay(true);
chart.getOptions().getSubtitle().setColor("red");

IsColor color = chart.getOptions().getSubtitle().getColor();
boolean display = chart.getOptions().getSubtitle().isDisplay();

The defaults values are set in global defaults options, see default global title options.

The following are the attributes that you can set:

Name	Type	Scriptable	Description
align	ElementAlign	Yes	Alignment of the subtitle.
color	String - IsColor	Yes	Color of text of the subtitle. See default colors.
display	boolean	Yes	If true, the subtitle is shown.
font	IsFont	Yes	Font of subtitle text. The default value is the global font with the style set to FontStyle.BOLD. See Font.
fullSize	boolean	Yes	Marks that this box should take the full width/height of the canvas (moving other boxes).
padding	Padding	Yes	Number of pixels to add above and below the subtitle text. See padding documentation for more details.
position	Position	Yes	Position of subtitle.

Scriptable

Subtitle also accepts a callback, for some of above attributes, which is called at runtime and that takes the context as single argument, see here the details, which is representing contextual information and chart instance.

// get subtitle
Subtitle subtitle = chart.getOptions().getSubtitle();
// sets callback
subtitle.setPadding(new PaddingCallback<ChartContext>(){

   @Override
   public PaddingItem invoke(ChartContext context){
      PaddingItem padding = new PaddingItem(); 
      // your logic
      return padding;
   }
});

The following option can be set by a callback:

Name	Callback	Returned types
align	ElementAlignCallback<ChartContext>	ElementAlign
color	ColorCallback<ChartContext>	String - IsColor
display	DisplayCallback<ChartContext>	boolean
font	FontCallback<ChartContext>	FontItem
fullSize	FullSizeCallback<ChartContext>	boolean
padding	PaddingCallback<ChartContext>	PaddingItem
position	PositionCallback<ChartContext>	Position