Difference between revisions of "timer.start"
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timer.'''start''' is a function that is part of the [[:Category:timer|timer]] functions. | timer.'''start''' is a function that is part of the [[:Category:timer|timer]] functions. | ||
| − | + | This fucntion starts the timer with the given period in seconds.<br /> | |
| + | This means that the this function fires the [[on.timer]]() event (that you have to define with a function in your code) will be called every x seconds, according to the period given in the parameter.<br /> | ||
If the timer is already running when this routine is called, the timer is reset to the new period. | If the timer is already running when this routine is called, the timer is reset to the new period. | ||
| − | |||
<br /> | <br /> | ||
| Line 22: | Line 22: | ||
== Example == | == Example == | ||
| − | <source>timer.start(0.5)</source> | + | |
| + | This example will display on the top-left corner of the screen a number going from 0 to infinity (it never stops), by adding 1 to ''variable'' every 0.5 seconds. | ||
| + | |||
| + | <source> | ||
| + | variable = 0 | ||
| + | |||
| + | function on.timer() | ||
| + | timer.stop() -- stops the current timer. Not necessary. | ||
| + | variable = variable + 1 | ||
| + | platform.window:invalidate() -- screen refresh (on.paint is called) | ||
| + | end | ||
| + | |||
| + | function on.paint(gc) | ||
| + | timer.start(0.5) -- will fire the on.timer event every half second. | ||
| + | gc:drawString(variable,0,0,"top") -- display the number | ||
| + | end</source> | ||
== See also == | == See also == | ||
Latest revision as of 18:45, 7 January 2012
timer.start is a function that is part of the timer functions.
This fucntion starts the timer with the given period in seconds.
This means that the this function fires the on.timer() event (that you have to define with a function in your code) will be called every x seconds, according to the period given in the parameter.
If the timer is already running when this routine is called, the timer is reset to the new period.
This has been introduced in TI-Nspire OS 3.0 (Changes).
Syntax
timer.start(period)
| Parameter | Type | Description |
|---|---|---|
| number | the time period in seconds for the timer to start. Must be > 0.01 |
Example
This example will display on the top-left corner of the screen a number going from 0 to infinity (it never stops), by adding 1 to variable every 0.5 seconds.
variable = 0
function on.timer()
timer.stop() -- stops the current timer. Not necessary.
variable = variable + 1
platform.window:invalidate() -- screen refresh (on.paint is called)
end
function on.paint(gc)
timer.start(0.5) -- will fire the on.timer event every half second.
gc:drawString(variable,0,0,"top") -- display the number
endSee also
