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- 5.7.2 CHANGE POLYGON
-
-
- The CHANGE POLYGON command is used to alter the shape or to change the fill
- font for an existing polygon entity.
-
-
- COMMAND FORMAT
-
- The command format varies depending on the modification mode chosen. The
- different formats are explained with their associated modifiers.
-
-
- MODIFIERS
-
- FONT The FONT modifier is used to enter a family of modifiers
- which may be used to specify an alternative fill for existing
- polygon entities.
-
- The command format using this modifier is:
-
- #CHANGE POLYGON FONT modifiers :Ent x1 x2 ... xn
-
- The selected fill style will be applied to all polygons
- identified via IDENTS.
-
- .NULL NULL is used to change the polygon fill to a solid colourfill
- in the layer dependent colour. This is the default fill type
- for polygons.
-
- The rest of the modifiers available to specify alternative
- fill type are described under the documentation for the DRAW
- POLYGON command.
-
- ADD The ADD modifier is used to indicate that a sub-polygon
- definition is to be added to an existing polygon. The command
- format when using ADD is:
-
- #CHANGE POLYGON ADD :Ent x1 :Loc x2 x3 ... xn [:Ent ... ]
-
- 'x1' is used to select the required polygon. Locations 'x2'
- through to 'xn' define the boundary of a sub-polygon which is
- added to the polygon entity. This allows you to cut out
- sections of an existing polygon. ( See fig. 5.51 ).
-
- SUBTRACT The SUBTRACT modifier is used to indicate that sub-polygon
- definitions are to be removed from an existing polygon
- entity. The command format when using SUBTRACT is:
-
- #CHANGE POLYGON SUBTRACT :Ent x1 :Loc x2 ... xn [:Ent .. ]
-
- 'x1' is used to select the required polygon. Locations 'x2'
- through to 'xn' are used identify which sub-polygon
- definitions are to be removed. The main polygon boundary
- cannot be removed. ( See fig. 5.52 ).
-
- EDIT The EDIT modifier is used to indicate that the main polygon
- boundary or any sub-poygon boundary for an existing polygon
- entity will be altered. The command format when using EDIT
- is:
-
- #CHANGE POLYGON EDIT :Ent x1 :Loc x2 x3 ... xm xn [:Ent ]
-
- 'x1' is used to select the required polygon. Locations 'x2'
- through to 'xn' define the boundary alteration and are also
- used to select whether the main polygon boundary or a sub-
- polygon boundary will be changed.
-
- Locations 'x2' and 'xn' mark the start and end of the boundary
- alteration. Both the points 'x2' and 'xn' must lie in the
- vicinity of the same polygon boundary. The polygon boundary
- nearest to these two points will be altered.
-
- The new boundary shape is made by adding the section defined
- by the locations 'x2' through to 'xn' at the two points where
- the new section joins the existing boundary. These two points
- are made at the intersection of the two vectors x2,x3 and
- xm,xn with the selected polygon boundary. ( See fig. 5.53 ).
-
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