Difference between revisions of "DISPLAY (function)"

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{{Cl|DRAW}} "ND10F10L3F5L4H5L3"
 
{{Cl|DRAW}} "ND10F10L3F5L4H5L3"
 
{{Cl|_DISPLAY}}                  'statement shows image
 
{{Cl|_DISPLAY}}                  'statement shows image
{{Cl|PCOPY}} 100, {{Cl|_DISPLAY (function)|_DISPLAY}} 'function as destination page
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{{Cl|PCOPY}} 100, {{Cl|_DISPLAY (function)|_DISPLAY}} 'with the function return as destination page
 
{{Cl|END SUB}} '' ''
 
{{Cl|END SUB}} '' ''
 
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Revision as of 04:29, 8 November 2010

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


Syntax

result& = _DISPLAY


Description

  • Will return 0 if in the default image.
  • Not to be confused with the _DISPLAY statement that displays the screen if not using _AUTODISPLAY.


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(0.02) UpdateCursor TIMER ON END SUB SUB UpdateCursor PCOPY _DISPLAY, 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 'with the function return as destination page END SUB

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


See also

  • SCREEN (note the QB64 use of SCREEN to set which image to display)
  • PCOPY



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