Calibration page on startup then times out

Hi All,
I'm trying to make a Calibration Page that times out after 30 seconds, this part is ok, i would like to add an onscreen count down time to this screen showing how long before the page closes and your returned to the Welcome Screen...See code below. It's mostly working except that the onscreen countdown just keeps overwriting the same place, and it goes to the Welcome screen after about 2 seconds.
Any help is always appreciated.

Code:

 If ShowingPage("Calibration Page") then Begin
 
 TextPos(335, 373);
 SetFontSize(20);
 
 DrawText('', 60 - TimerTime(3));
 Delay(1);
 If timertime(3) = 0 then;

ShowPage("Welcome Screen")

 end

 

DrawText only writes the foreground. You need to erase the background first by drawing a filled rectangle.

The semicolon is terminating the if statement. Remove it.

 

Thanks Ash,
I did look for the commend to erase the background but couldn't find anything to do it...

Oops missed that,
Will do that background square now...

 

Yep, so far so good, thanks Ash.

 

I know i'm missing something really stupid hear but when i run the code below all i get is a box saying 60 and it isn't changing...Any ideas will help...

Code:

If ShowingPage("Calibration Page") then
 Begin
 TimerSet(3,30);
 TextPos(335, 373);
 SetFontSize(20);
 DrawText('', 60 - TimerTime(3));
  Delay(1);
 SetBrushColor(clcyan);
 Rectangle(380, 370, 450, 400);
 If timertime(3) = 0 then
 ShowPage("Welcome Screen")
 end

 

Found it,
The line TimerSet(3,30)
keeps resetting the value for the timer to 30.
Took it out and all good now.

 

OK,
Next problem,
It just keeps counting down even after passing 0, it then goes negative...
What do i need to do to get it to change pages at or after 0.
I did try If timertime(3) < 0 then
And also If timertime(3) = "0:00:00" then

 

Timers count up not down.

 

Yes but this line is out of the help on timer time, it does count down, looks like it does on the screen from 30 to 0 but then keeps going into negative. I set the time time to start at 30
DrawText('', 60 - TimerTime(3));

 

But you are drawing 60 - TimerTime(3) so if the displayed time is going down the timer is going up. You need to stop at timer = 60

Timers go up. If you set a start time it starts at that time and goes up. I've no idea why this is an option as it's basically useless. So yours starts at 30 so 60-30 = 30, then goes to 31 so 60-31=29 etc. When the timer goes past 60 you count goes -ve at you see.

You may as well just start the counter at 0 then show 30-timer and stop at 30.

 

I think I get it, I'll try on Thursday when I'm back at work. Thanks again. The help section is usually very good with these things.

 

The help is a bit misleading here. Because timers only count up, the only way to get a countdown timer is by subtracting its current value from a fixed value which is all the help is showing you.

Another thing to think about is that you are writing the time value to the screen every scan (200mS) so you are repeating each value 5 times. This is wasting considerable resources. You should only be updating the screen every second when the timer ticks over.

 

Thanks Ashley.
Always helpful.