Graphics Subroutine: Erases the target area and fills it with the current background color.
CALL CLEARSCREEN (area)
area |
(Input) INTEGER(4). Identifies the target area. Must be one of the following symbolic constants (defined in IFQWIN.F90): $GCLEARSCREEN - Clears the entire screen.
$GVIEWPORT - Clears only the current viewport.
$GWINDOW - Clears only the current text window (set with SETTEXTWINDOW).
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All pixels in the target area are set to the color specified with SETBKCOLORRGB. The default color is black.
例
USE IFQWIN
CALL CLEARSCREEN($GCLEARSCREEN)