Drawing construction lines horizontally and vertically

Construction lines can be drawn parallel to the x-axis of the current UCS (horizontal), parallel to the y-axis of the current UCS (vertical), or parallel to both the x- and y-axis of the current UCS (both horizontal and vertical).

To draw a horizontal construction line

   1   Do one of the following to choose Construction Line > Horizontal ():  

    On the ribbon, choose Draw > Construction Line > Horizontal.

    On the menu, choose Draw > Construction Line > Horizontal.

    On the Construction Line toolbar, click the Horizontal tool.

    Type cline and then press Enter.

   2   Specify a point along the line.

   3   To complete the command, press Enter.

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Point through which you want the horizontal construction line to pass (A).

To draw a vertical construction line

   1   Do one of the following to choose Construction Line > Vertical ():  

    On the ribbon, choose Draw > Construction Line > Vertical.

    On the menu, choose Draw > Construction Line > Vertical.

    On the Construction Line toolbar, click the Vertical tool.

    Type cline and then press Enter.

   2   Specify a point along the line.

   3   To complete the command, press Enter.

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Point through which you want the vertical construction line to pass (A).

To draw both horizontal and vertical construction lines

   1   Do one of the following to choose Construction Line > Both Horizontal and Vertical ():  

    On the ribbon, choose Draw > Construction Line > Both Horizontal and Vertical.

    On the menu, choose Draw > Construction Line > Both Horizontal and Vertical.

    On the Construction Line toolbar, click the Both Horizontal and Vertical tool.

    Type cline and then press Enter.

   2   Specify a point where both construction lines intersect.

   3   To complete the command, press Enter.

Horizontal and vertical construction lines can also be drawn automatically.
Choose Draw > Construction Line > Automatic Horizontal, Automatic Vertical, or Automatic Both, then select the entities around which you want to draw construction lines. Construction lines are drawn automatically without creating duplicates for overlapping vertices or entities.