Command: Rect

Function: Draw a variety of types of rectangular box.

Location: 1. POP menu YSup -> Rectangle
          2. Toolbar Y_Polygon -> Rectangle

Enter the layer name: the default layer INS (accept the absence of the layer name).

Center point: point to take the rectangular box center 
    and four oblique angle of any point.

Oblique diagonal: (default) point to take a rectangular box diagonal.

Select a line: a horizontal line and a vertical line 
   (a horizontal line and a vertical line 
    [ the starting point of the line, the end ] to form a rectangular box).
  Or two horizontal lines and two vertical lines 
   (two horizontal lines and two vertical lines 
     [ extension line intertwined ] into a rectangular box).

Rectangular box type
 1. sharp 2. Fillet 3. Chamfer 4. With external cutting 5. Connect the external arc

How to draw a rectangular box centerline.
Instruction: Ycen draws the center line, greater than or equal to the diameter.

Location: 1. POP menu YSup -> Center line
          2. Toolbar Y_Line -> Center line
