## rings

rings — an extension to highlight closed rings in a structure.

## Synopsis

    #define             EXT_RINGS_ID
    VisuExtension*      initExtRings                        ();
    gboolean            extRingsSet_isOn                    (gboolean value);
    gboolean            extRingsGet_isOn                    ();
    void                extRingsDraw                        (VisuData *dataObj);

## Description

TODO

## Details

### EXT_RINGS_ID

    #define EXT_RINGS_ID "Rings"

The id of the ring extension.

### initExtRings ()

    VisuExtension*      initExtRings                        ();

### extRingsSet_isOn ()

    gboolean            extRingsSet_isOn                    (gboolean value);

Set if rings are drawn or not.

`value` : | a boolean.
Returns : | TRUE is status is changed.

Since 3.5

### extRingsGet_isOn ()

    gboolean            extRingsGet_isOn                    ();

Retrieves if the ring extension is used.

Returns : | TRUE if ring extension is used.

Since 3.5

### extRingsDraw ()

    void                extRingsDraw                        (VisuData *dataObj);

Draw the rings (if any).

`dataObj` : | a VisuData object.

Since 3.5