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Liberty BASIC Help Online

The Timer Statement

Liberty BASIC includes a timer statement which uses the computer's hardware timer. Most PCs have a timer with a resolution of approximately 56 milliseconds which ticks 18 times a second. The timer allows the addition of a clock to a program, or or it allows the program to wake up every few seconds to check for some condition, or it can be used to control the rate of animation of a game. There are other uses as well.

The TIMER command specifies how many milliseconds to wait between timer signals. One second is 1000 milliseconds. It also specifies a routine to serve as an event handler. The timer may be turned off and then back on.

Here is a short example:

timer 3000, [threeSeconds]

wait

[threeSeconds]

timer 0

confirm "Three seconds have passed. Do it again?"; repeat

if repeat then

timer 3000, [threeSeconds]

wait

end if

end