Arc Columns design the same way as normal ones, only now there are two arcs on each side of the column.
When the option is active, mouse cursor icon changes to wavy arc with letter A below.
Drawing of the first four points is the same as in normal arc
When the fourth point is set, arc becomes available. The line connecting the first and fourth point becomes transforms into arc.
After the desired arc is set, user confirms the arc with left mouse click. Now the line connecting second and third point transforms into arc
Using the mouse, user adjusts the arc. When done with adjusting user confirms the arc column with left button mouse click.
To continue drawing arc columns, just like in normal columns, only two points are needed. New column starting point is the last point from previous column.
User selects the first closing point and second closing point. Before second closing point is set, ThreadsES creates lines for better preview. To start creating arcs, user must set the second closing point.
After the second closing point is set, line connecting sixth and fourth point will transform to arc. When the first arc is set, line connecting third and fifth point will transform to arc. Procedure is same as the first arc column. When user is happy with adjustments, he confirms the change.
To start drawing new arc columns on random place (just like in normal column), New Arc Column command is used. Using the context menu, command becomes active.
Dashed line that represents connector stitch between two arc columns appears. By clicking anywhere in the drawing user defines the first arc point. To draw an arc columns, user follows the same steps as for the first arc column.