Remote-processing BASIC 52 Uživatelský manuál stáhnout pdf (Strana 35)

RPBASIC-52 PROGRAMMING GUIDE

2-16

CLEAR DISPLAY

Syntax: CLEAR DISPLAY Clears character and, if available, graphics displays.

CLEAR DISPLAY LINE Clears character line

CLEAR DISPLAY LINE(x1,y1)-(x2,y2) Clears graphics line

CLEAR DISPLAY P(x,y) Clears a point on a graphics screen

CLEAR DISPLAY C Clears characters only on graphics screen

CLEAR DISPLAY G Clears graphics only on graphics screen

Function: Clears display as directed by its options

Mode: Command, Run

Use: CLEAR DISPLAY Clears entire display and homes cursor

Cards: All

DESCRIPTION

Character displays may use only CLEAR DISPLAY and CLEAR DISPLAY LINE.

Character displays require several milli-seconds to clear. After CL EAR DISPLAY statement, it is best to

execute several other RPBASIC-52 commands before using the DISPLAY command again. This will allow

the display to "catch up" to the program. Failure to do so may result in an incomplete screen clear or missing

characters/data.

NOTE: CLEAR DISPLAY LINE requires several milli-seconds to execute. LCD displays require up to 10

ms while the VF display requires 20 ms. Processing other RPBASIC-52 interrupts are delayed by

this amount of time.

The x and y graphic coordinates are the same as those specified in the DISPLAY LINE and DISPLAY P

commands.

DISPLAY

ERROR

BAD SYNTAX When wrong option is used with a display.

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