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REM Note that this example will be executed everywhere REM BUT Commodore VIC-20 and Philips VG5000. PROCEDURE example ON ALL BUT VIC20, VG5000 BITMAP ENABLE(16) DEFINE PALETTE NOT PRESERVE CLS BLACK mask := LOAD IMAGE("blit_mask.png") EXACT TRANSPARENCY BLACK OPACITY LIGHT WHITE background := LOAD IMAGE("blit_background.png") sprite := LOAD IMAGE("blit_sprite.png") CONST x = ( SCREEN WIDTH - IMAGE WIDTH(background) ) \ #2 CONST y = ( SCREEN HEIGHT - IMAGE HEIGHT(background) ) \ #2 PUT IMAGE background AT x,y REM In the first blit, the mask is blitted onto the background using REM the raster operator AND. Because any value ANDed with 0 equals 0, REM and any value ANDed with 1 is unchanged, black areas are created REM where the actual sprites will appear, while leaving the rest of REM the background alone. BLIT bop1 AS ( ( SOURCE ) AND ( DESTINATION ) ) BLIT IMAGE mask AT x+10,y+10 WITH bop1 REM In the second blit, the sprite is blitted onto the newly altered REM background using the raster operator of OR. Because any value REM ORed with 0 is unchanged, the background is unaffected and the REM black areas are filled with the actual sprite image. BLIT bop2 AS ( ( ( INVERSE ( SOURCE 2 ) ) AND ( SOURCE 1 ) ) OR ( DESTINATION ) ) BLIT IMAGES sprite, mask AT x+10,y+10 WITH bop2 END PROC CALL example ON ALL BUT VIC20, VG5000
Some examples: HELLO WORLD PARABOLA AND HYPERBOLA PRE-EMPTIVE PARALLEL COMPUTING

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