/**
* If the source and target events are visible, draw a line between the source and target, and
* save it in the map of lines. This is so that the lines can be removed when changing the
* selected event.
*/
private void drawFamilyStoryLine(Event source, Event target, int width) {
if (source == null || target == null) return;
if (MainModel.isEventVisible(source.getId()) && MainModel.isEventVisible(target.getId())) {
familyLines.add(drawLine(source, target, width, Settings.getFamilyStoryColor()));
}
}
