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3.2.1 DEFINE SHEET
The DEFINE SHEET command is used to redefine the current SHEET viewport size
and units.
The sheet viewport is the overall drawing area available to any X-CAD
drawing, it is analogous to a sheet of paper hence the name. It is impor-
tant to choose the correct sheet size as like on a conventional drawing
sheet, no entities can be created or moved outside of the sheet area.
The sheet size chosen should reflect the actual size of any plotted output
and not the true size of the drawing. To create a drawing that would be
much larger than any workable sheet size - if drawn at full size without
manual scaling - the recommended procedure is to define a viewport within
the sheet to suit the particular application. As a secondary viewport may
have an independent scale and independent unit types, this leads to a more
intuitive way of dealing with scaled drawings.
Defining a new sheet size should always be the first command to use when
creating a new drawing. Once any entities are created in the sheet viewport,
the existing sheet cannot be redefined without first deleting the current
drawing.
The origin of the sheet viewport is always in the bottom left-hand corner.
To create a drawing with an offset origin, a secondary viewport must be
defined within the sheet viewport.
MODIFIERS
ISO Allows one of several predefined drawing sheet sizes to be
chosen that conform to the ISO standard. The available options
are:
A0 1189 by 841 millimetres.
A1 841 by 594 millimetres.
A2 594 by 420 millimetres.
A3 420 by 297 millimetres.
A4 297 by 210 millimetres.
The default units for ISO sheet sizes are millimetres. The
default orientation of the sheet is longest side horizontal.
.UNITS Allows a choice of metric units to be used with an ISO size
sheet:
MM Millimetres.
CM Centimetres.
M Metres.
.VERTICAL If this modifier is entered, the sheet will be oriented with
the longest side vertical.
BS Allows one of several predefined drawing sheet sizes to be
chosen that conform to the BS standard. The available options
are:
B1 39.5 by 27.75 inches.
B2 27.75 by 19.75 inches.
B3 19.75 by 13.87 inches.
B4 13.87 by 9.87 inches.
The default units for BS sheet sizes are inches. The default
orientation of the sheet is longest side horizontal.
.UNITS Allows a choice of imperial units to be used with a BS size
sheet:
IN Inches.
FT Feet.
.VERTICAL If this modifier is entered, the sheet will be oriented with
the longest side vertical.
ANSI Allows one of several predefined drawing sheet sizes to be
chosen that conform to the ANSI standard. The available options
are:
A 11.0 by 8.5 inches.
B 17.0 by 11.0 inches.
C 22.0 by 17.0 inches.
D 34.0 by 22.0 inches.
E 44.0 by 34.0 inches.
The default units for ANSI size sheets are inches. The default
orientation of the sheet is longest side horizontal.
.UNITS Allows a choice of imperial units to be used with an ANSI size
sheet:
IN Inches.
FT Feet.
.VERTICAL If this modifier is entered, the sheet will be oriented with
the longest side vertical.
CUSTOM Allows a custom drawing sheet to be defined.
.WIDTH A real value defining the width of the drawing sheet.
.HEIGHT A real value defining the height of the drawing sheet.
.UNITS Allows a choice of units to be used with the drawing sheet:
MM Millimetres.
CM Centimetres.
M Metres.
KM Kilometres.
IN Inches.
FT Feet.
ML Miles.