_DISPLAY (function) - mkilgore/QB64pe GitHub Wiki

The _DISPLAY function returns the handle of the current image that is displayed on the screen.

Syntax

currentImage& = _DISPLAY

Description

  • Returns the current image handle value that is being displayed. Returns 0 if in the default screen image.
  • Not to be confused with the _DISPLAY statement that displays the screen when not using _AUTODISPLAY.

Examples

Example: Creating a mouse cursor using a page number that you create in memory without setting up page flipping. 

SCREEN _NEWIMAGE(640, 480, 32) 'any graphics mode should work without setting up pages
_MOUSEHIDE
SetupCursor
PRINT "Hello World!"
DO: _LIMIT 30
  DO WHILE _MOUSEINPUT: LOOP 'main loop must contain _MOUSEINPUT   
'       other program code    
LOOP

SUB SetupCursor
ON TIMER(n)(0.02) UpdateCursor
TIMER ON
END SUB

SUB UpdateCursor
PCOPY _DISPLAY (function), 100  'any page number as desination with the _DISPLAY function as source
PSET (_MOUSEX, _MOUSEY), _RGB(0, 255, 0)
DRAW "ND10F10L3F5L4H5L3"
_DISPLAY                  'statement shows image
PCOPY 100, _DISPLAY (function) 'with the function return as destination page
END SUB '' ''

Note: Works with the _DISPLAY function return as the other page. If mouse reads are not crucial, put the _MOUSEINPUT loop inside of the UpdateCursor SUB.

See also

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