class TLine: public TObject, public TAttLine

 Line default constructor.

 Line normal constructor.

 Line default destructor.

 Line copy constructor.

 Copy this line to line.

 Compute distance from point px,py to a line.

 Draw this line with new coordinates.

 Draw this line with new coordinates in NDC.

 Execute action corresponding to one event.
  This member function is called when a line is clicked with the locator

  If Left button clicked on one of the line end points, this point
     follows the cursor until button is released.

  if Middle button clicked, the line is moved parallel to itself
     until the button is released.

 List this line with its attributes.

 Paint this line with its current attributes.

 Draw this line with new coordinates.

 Draw this line with new coordinates in NDC.

 Dump this line with its attributes.

 Save primitive as a C++ statement(s) on output stream out

 Check whether this line is to be drawn horizontally.

 Check whether this line is to be drawn vertically.

 Force the line to be drawn horizontally.
 Makes fY2 equal to fY1. The line length is kept.
 TArrow and TGaxis also get this function by inheritance.

 Force the line to be drawn vertically.
 Makes fX2 equal to fX1. The line length is kept.
 TArrow and TGaxis also get this function by inheritance.

 Stream an object of class TLine.