ugBASIC User Manual

   EVERY value[,timer] TICKS CALL identifier

The EVERY allows to execute a procedure at specified intervals of time. It is especially useful for creating animations, handling real-time events, and simulating dynamic behavior in your programs. You can give the value as number of ticks to wait for triggering the call, and timer to select a specific timer (up to 8 timers are present).

It allows you to create smooth animations by moving objects on the screen at regular intervals, and it is essential for managing real-time events, such as character movement, object collisions, and keyboard input management. It can be used also to simulate physical or biological phenomena that evolve over time., or to create dynamic visual effects, such as sparks, explosions, or screen transitions.

The speed at which EVERY commands execute depends on the frame rate of your computer, and from the parameter value given. A higher frame rate means that actions will be executed more frequently, while an higher value means that actions will be executed less frequently.

Note that the procedure execution time should be less than the interval time, or the main program timings will be affected!

There are 8 delay timers from 0 to 7 which can be specified with timer. If omitted timer defaults to 0. In the case of parallel task has 0 the highest and 8 the lowest priority.

With EVERY OFF and EVERY ON you can disable or enable the timed calls. Procedures run as long as the main loop / program runs, even the main programm is paused. It is important to know or realise that low-priority-procedures which occurs simultanously to higher-priority-procedures are not lost. Their task remains or handled again after finishing the higher-prio interrupt.

Important: the meaning of this command is not altered by OPTION CALL pragma, so this is always a GOSUB and not a GOTO!

  EVERY 50 TICKS CALL changeBorderColor
  EVERY 50,2 TICKS CALL changeBorderColor

See also the following example files:

• control_periodic_02.bas
• control_periodic_03.bas

 EvCa

• Dragon 32
• Commodore 128 (MOS 8502)
• SEGA SG-1000
• Commodore 64
• Commodore VIC-20
• Atari (400/800)
• Commodore PLUS/4
• VG-5000
• Olivetti Prodest PC128
• Dragon 64
• Thomson MO5
• SEGA SC-3000
• ColecoVision
• TRS-80 Color Computer 3
• MSX
• TRS-80 Color Computer

AFTER...GOSUB EVERY ON EVERY OFF

If you have encountered a problem using this command, if you think there is a bug or the explanation is unclear, please open an issue for this keyword on GitHub. Thank you!