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(Created page with "The VIEW PRINT statement defines the boundaries of a text viewport {{KW|PRINT}} area. {{PageSyntax}} : '''VIEW PRINT''' [{{Parameter|topRow%}} '''TO''' {{Parameter|bottomRow%}}] {{Parameters}} * {{Parameter|topRow%}} and {{Parameter|bottomRow%}} specify the upper and lower rows of the text viewport. * If {{Parameter|topRow%}} and {{Parameter|bottomRow%}} are not specified when first used, the text viewport is defined to be the entire screen. {{PageDescription}...") |
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{{Parameters}} | {{Parameters}} | ||
* {{Parameter|topRow%}} and {{Parameter|bottomRow%}} specify the upper and lower rows of the text viewport. | * {{Parameter|topRow%}} and {{Parameter|bottomRow%}} specify the upper and lower rows of the text viewport. | ||
* If {{Parameter|topRow%}} and {{Parameter|bottomRow%}} are not specified when first used, the text viewport is defined to be the entire screen. | * If {{Parameter|topRow%}} and {{Parameter|bottomRow%}} are not specified when first used, the text viewport is defined to be the entire screen. | ||
{{PageDescription}} | {{PageDescription}} | ||
* A second [[VIEW PRINT]] statement without parameters can also disable a viewport when no longer needed. | * A second [[VIEW PRINT]] statement without parameters can also disable a viewport when no longer needed. | ||
* [[CLS]] or [[CLS|CLS 2]] statement will clear the active text viewport area only, and reset the cursor location to {{Parameter|topRow%}}. | * [[CLS]] or [[CLS|CLS 2]] statement will clear the active text viewport area only, and reset the cursor location to {{Parameter|topRow%}}. | ||
* A {{KW|SCREEN}} mode change or {{KW|RUN}} statement can also clear and disable viewports. | * A {{KW|SCREEN}} mode change or {{KW|RUN}} statement can also clear and disable viewports. | ||
| Line 46: | Line 46: | ||
{{Cl|_DELAY}} 4 | {{Cl|_DELAY}} 4 | ||
{{Cl|CLS}} | {{Cl|CLS}} | ||
{{Cl|PRINT}} "Back to top left after CLS!" | {{Cl|PRINT}} "Back to top left after CLS!" | ||
{{CodeEnd}} | {{CodeEnd}} | ||
: ''Note:'' The bottom row of the VIEW PRINT port can be used only when located or prints end with semicolons. | : ''Note:'' The bottom row of the VIEW PRINT port can be used only when located or prints end with semicolons. | ||
Revision as of 02:57, 23 January 2023
The VIEW PRINT statement defines the boundaries of a text viewport Template:KW area.
Syntax
- VIEW PRINT [topRow% TO bottomRow%]
- 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.
Description
- 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 Template:KW mode change or Template:KW 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!
Example: Demonstrates how text scrolls within the text viewport.
' clear the entire screen and show the boundaries of the new text viewport CLS PRINT "Start at top..." LOCATE 9, 1: PRINT "<- row 9 ->" LOCATE 21, 1: PRINT "<- row 21 ->" ' define new text viewport boundaries VIEW PRINT 10 TO 20 ' print some text that will scroll the text viewport FOR 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.
See also