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- 3.2.2 DEFINE VIEWPORT
-
-
- The DEFINE VIEWPORT is used to define a secondary viewport within the area
- of the SHEET viewport. The maximum number of viewports that can be defined
- is 32 including the SHEET viewport.
-
- Viewports inside the SHEET viewport are like drawings within a drawing. A
- secondary viewport can have an independent scale, origin and units type.
- This allows certain areas to be set up on the sheet for drawing scaled ob-
- jects, or for creating drawings that require a coordinate system with the
- origin ( point X 0 Y 0 ) in some place other than the bottom left of the
- drawing area.
-
-
- COMMAND FORMAT
-
- #DEFINE VIEWPORT modifiers :Loc x1 x2 :Origin x3 [CR]
-
- Unless the viewport window is specified explicitly, locations 'x1'and 'x2'
- define a window on the SHEET viewport that will become the new viewport
- maximum extents.
-
- Once a viewport area has been defined, it cannot be made larger. So a
- viewport area should be defined with this in mind. It is better to over-
- estimate a viewport area as viewport windows can be clipped to a smaller
- area.
-
- Unless the viewport origin is specified explicitly, location 'x3' defines
- the point that will become the new viewport origin. ( ie the coordinate
- point X0Y0 ). The viewport origin can be anywhere on the sheet, it does not
- have to be within the new viewport area. ( See fig. 3.4 ).
-
-
- MODIFIERS
-
- NAME The name of the new viewport. This must be a unique name made
- up of a maximum of 20 alphabetic characters.
-
- UNITS The new viewport units type. This may be one of:
-
- MM Millimetres.
- CM Centimetres.
- M Metres.
- KM Kilometres.
- IN Inches.
- FT Feet.
- ML Miles.
-
- If the modifier is omitted, the new viewport will use the sheet
- units.
-
- SCALE Requires a viewport scale value where the value defines the
- scale as "1 to value". A value of 100 will define a viewport
- scale of 1 to 100. This allows large or small objects to be
- drawn in their true dimensions but at a scale relative to the
- overall drawing sheet.
-
- The default viewport scale is 1.0 .
-
- CUSTOM Indicates that the viewport window area is to be defined
- explicitly. When using the CUSTOM modifier, the command format
- differs slightly:
-
- #DEFINE VIEWPORT CUSTOM modifiers :Origin x1 [CR]
-
- The location 'x1' defines where the bottom left corner of the
- new viewport will be on the drawing sheet.
-
- .HEIGHT The height of the new viewport. This is specified in the units
- and scale of the new viewport.
-
- .WIDTH The width of the new viewport. This is specified in the units
- and scale of the new viewport.
-
- .ORIGIN Requires 2 values to specify where the origin of the new view-
- port will be relative to the bottom left corner. The origin
- point is given in terms of the new viewport units and scale. ie
-
- ORIGIN -3,5.5
-
- Will make the new viewport origin at the point -3.0,5.5 relative
- to the bottom left corner of the new viewport ( point 'x1' ).
-
-
-