FLIP

When AUTOFLIP is set to FALSE, FLIP presents the current backbuffer to the screen (frontbuffer). This gives you explicit control over when a frame becomes visible - useful for animations or multi-step drawing.

Drawing statements (e.g. LINE, CIRCLE, RECTANGLE, PLOT) update the backbuffer.
FLIP swaps the backbuffer to the display in one step, so the whole frame appears at once.
If AUTOFLIP is TRUE, the system presents frames automatically and you typically do not call FLIP yourself.

Example: manual presentation

AUTOFLIP FALSE
 
X = 40
GCOL RGB(0,255,0)
 
WHILE X < 300
    CLS
    CIRCLE X, 120, 20, TRUE
    FLIP
    X = X + 5
ENDWHILE

This draws a moving filled circle and shows each frame explicitly with FLIP.

Notes

If you do not call FLIP while AUTOFLIP is FALSE, the screen will not update until the next flip.
CLS clears both text and graphics; use it when you want a fresh frame for the next draw.
Colour for graphics is set with GCOL, typically via RGB(r,g,b).

See also:
AUTOFLIP · GCOL · CIRCLE · LINE · RECTANGLE · PLOT