Language Reference |
defines a blanking viewport
{minimum-x minimum-y maximum-x maximum-y} |
Note that the blanking area (as specified by the viewport argument) is defined on the current viewport, and it is released when the viewport is changed or popped. At most one blanking area is in effect at any time. The blanking area can also be released by the GBLKVPD subroutine or another GBLKVP call. The coordinates in use for this graphics command are given in normalized coordinates because it is defined relative to the current viewport.
For example, to blank out a rectangular area with corners at the coordinates (20,20) and (80,80), relative to the currently defined viewport, use the following statement:
call gblkvp({20 20, 80 80});No graphics or text can be written outside this area until the blanking viewport is ended.
Alternatively, if you want to clip inside the rectangular area, use the inside parameter, as follows:
call gblkvp({20 20, 80 80},1);See also the description of the CLIP option in the RESET statement.
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