Each of the line operations creates one or more line segments which are affected by the line width option under Style Modifiers. In each case the line operations are controlled by depressing the left mouse button, dragging, and releasing. The Escape key may be used to cancel an action during a drag.
The Line operation creates a new disconnected line segment for each Drag sequence. The PolyLine operation creates a new line segment connected to the last for each Drag sequence. The Polygon operation acts the same as the PolyLine operation, but closes the polyline to form a polygon when polygon mode is terminated.
Trace mode creates a series of short line segments as the cursor is dragged around with the left mouse button depressed. Trace & Close mode is similar to Trace mode, except that it closes the traced polygon when the left mouse button is released.