{
/**
- * compute the perceived colour for a given column position in sequenceI,
- * taking transparency and feature visibility into account.
+ * Returns the combined feature colour for a given sequence and column
+ * position, taking into account feature colour schemes, ordering, feature and
+ * feature group visibility, and transparency. Returns null if there is no
+ * visible feature at the position.
+ * <p>
+ * The Graphics argument is optional and may be null if no transparency is
+ * applied. With feature transparency, visible features are written to the
+ * graphics context and the composite colour can be read off.
+ * <p>
+ * This is provided for use by Structure Viewers and the Overview Window to
+ * get the feature colour of the rendered sequence.
*
- * @param sequenceI
- * - sequence providing features
- * @param r
- * - column position
+ * @param sequence
+ * @param column
* @param g
* @return
*/
- Color findFeatureColour(SequenceI sequenceI, int r, Graphics g);
+ Color findFeatureColour(SequenceI sequence, int column, Graphics g);
/**
* trigger the feature discovery process for a newly created feature renderer.