Determines how lines are drawn.
|0||Gdk::LINE_SOLID||Lines are drawn solid.|
|1||Gdk::LINE_ON_OFF_DASH||Even segments are drawn; odd segments are not drawn.|
|2||Gdk::LINE_DOUBLE_DASH||Even segments are normally. Odd segments are drawn in the background color if the fill style is Gdk::SOLID, or in the background color masked by the stipple if the fill style is Gdk::STIPPLED.|