VIEW PRINT - mkilgore/QB64pe GitHub Wiki

The VIEW PRINT statement defines the boundaries of a text viewport PRINT area.

VIEW PRINT [topRow%]

• topRow% and bottomRow% specify the upper and lower rows of the text viewport.
• If topRow% and bottomRow% are not specified when first used, the text viewport is defined to be the entire screen.

• A second VIEW PRINT statement without parameters can also disable a viewport when no longer needed.
• CLS or CLS 2 statement will clear the active text viewport area only, and reset the cursor location to topRow%.
• A SCREEN mode change or RUN statement can also clear and disable viewports.
• After active viewport is disabled, normal screen printing and clearing can begin.
• Row coordinates may vary when a WIDTH statement has been used.
• Note: QB64 RUN statements will not close VIEW PRINT, VIEW or WINDOW view ports presently!

' define new text viewport boundaries
VIEW PRINT 10 TO 20

' print some text that will scroll the text viewport
FOR...NEXT i = 1 TO 15
  PRINT "This is viewport line:"; i
  SLEEP 1
NEXT i

' clear only the active text viewport with CLS or CLS 2
CLS
PRINT "After clearing, the cursor location is reset to the top of the text viewport."

' disable the viewport
VIEW PRINT
_DELAY 4
LOCATE 20, 20: PRINT "Print anywhere after view port is disabled"
_DELAY 4
CLS
PRINT "Back to top left after CLS!" '' ''

Note: The bottom row of the VIEW PRINT port can be used only when located or prints end with semicolons.

• CLS
• WINDOW
• VIEW (graphics view port)
• LOCATE, PRINT