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[SB4] GFILL and ACLS

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CharredCheeseCreated:
Hello again. I am trying to make a PONG clone using SB4. I tried using GBOX/GFILL to make a box as the paddle. The problem is that the box is like flickering. Did I do something wrong with me code?

ACLS is slow. It's only meant for complete resets of the display. To erase only the graphic page, use GCLS. Also, using LOOP ENDLOOP is preferable to using a GOTO label loop.
'acls at the beginning to reset the display
ACLS
LOOP
 'gcls in the loop to erase the graphics.
 GCLS
 GBOX 100,100,200,200
 VSYNC
ENDLOOP