Question....

[Guest gert1966]

Is there anyone who worked out a speed trend indicator in xml? Still coding on my Fokker PFD, but i really haven't got a clue how to create this one ( sadly math is not my strong point ;-) ) regards Gert Polkerman

[Guest The ATP Experience]

My best untested guess would beIn FS9 XML...(L:switch to turn on and off_If Req'd,bool) 1 == (L:Lock out variable,bool) 0 == &&if{ (P:Absolute Time,seconds) 0.20 + (>L:trend_timer,seconds)(A:indicated airspeed, knots) (>L:speed sample1,number)1 (>L:Lock out variable,bool) }__________________________________________________________________(L:Lock out variable,bool) 1 == (L:trend_timer,seconds) (P:Absolute Time,seconds) > && if{ (A:indicated airspeed, knots) (>L:speed sample2,number)0 (>L:Lock out variable,bool) }__________________________________________________________________(Put any variables you want to deactivate the code here...like pitot heat blockage, failures, or even if the indicator is inactive below certain speeds or altitudes) if{ (L:speed sample1,number) (L:speed sample2,number) + 5 * (>L:trend value,number) }___________________________________________________________________in display gauge be sure to add a visible tag: (L:trend_timer,seconds) 0 !=So it should work like this:Check switch on and Lock out 0...if so...if{current time in seconds + 0.20 seconds = trend timer Current speed number sent to Speed sample1Set lock out variable to 1 }___________________________________________________________________Check if lock out is 1...which can only be done by the previous line...and trend timer is now 0.20 seconds in the future...if so...if{Send current speed to speed sample2 and set lock out back to 0 to restart cycle }____________________________________________________________________deactivation codes...if none found...if{ speed sample1 + speed sample2 X 5 = rate of change per second...Send the results to (L:Trend_Value, number) this is the shift on the speed tape.multiply the 5 by the number of seconds in the future you want the guage the show...for example to show the trend in ten seconds would be X 50. This is the simplest calculation of how many knots of change is expected. There are much more complex math solutions but I don't understand them myself.The basic idea here is if you are increasing airspeed by 0.20 knots per sample that is 1 knots per second...so 0.20 X 5 would render the prediction 1 knots faster 1 second from now. Likewise, 0.20 X 50 would render the prediction 10 knots faster 10 seconds from now.Hope that helps. I'm glad you asked the question because I am making a similar gauge and this post forced me to think it out in a simple way!Thanks

[pve 0]

Hello Try (L:Sel_1,number) 9 < if{ (L:Sel_1,number) ++ (>L:Sel_1,number) } els{ 0 (>L:Sel_1,number) }(L:Sel_1,number) 1 == if{ (A:Airspeed select indicated or true, knots) (>L:Sel_2,number) } (L:Sel_1,number) 9 == if{ (A:Airspeed select indicated or true, knots) (>L:Sel_3,number) } (L:Sel_1,number) 0 == if{ (L:Sel_3,number) (L:Sel_2,number) - 10 * (>L:SpeedTrend,number) }

[spokes2112 179]

Here is another one, based on a 737 "bracket type" trend indicator with samples every 0.1 second computed for a 10 second trend. It was done for FS2002 so some things would have to be changed for your gauge, size, axis, ImageSizes=" " etc...(P:Local Time, seconds) 0.2 % 10 * int 0 == if{ (A:Airspeed indicated, knot) (>G:Var1) }(P:Local Time, seconds) 0.2 % 10 * int 1 == if{ (A:Airspeed indicated, knot) s1 (G:Var1) - 0.1 / 10 * l1 + (>G:Var3) }(G:Var3) (A:Airspeed indicated, knot) >(A:Airspeed indicated, knot) 45 < if{ 0 } els{ (G:Var3) (A:Airspeed indicated, knot) - }(G:Var3) (A:Airspeed indicated, knot) <(A:Airspeed indicated, knot) 45 < if{ 0 } els{ (G:Var3) (A:Airspeed indicated, knot) - } Regards,Roman

[Guest gert1966]

Guys, Lots of thanx for showing the way, I will with your permission ofcourse use the examples to make it work in my fokker PFD. now..... going to work !!! regards Gert Polkerman

[Guest The ATP Experience]

At what rate is that clocking? Is that 3 times in one pass?I like short code lol

[spokes2112 179]

:-bang

[n4gix 4,947]

I've "quoted" and "edited" Roman's original post to recover the XML script that's been "hidden" by the new forum software, and remove some extra "bits" that somehow snuck into the XML script... :(

Here is another one, based on a 737 "bracket type" trend indicator with samples every 0.1 second computed for a 10 second trend. It was done for FS2002 so some things would have to be changed for your gauge, size, axis, ImageSizes=" " etc...Regards,Roman

<Element>  <Select>	<Value>	  (P:Local Time, seconds) 0.2 % 10 * int 0 == if{ (A:Airspeed indicated, knot) (>G:Var1) }	</Value>  </Select></Element><Element>  <Select>	<Value>	  (P:Local Time, seconds) 0.2 % 10 * int 1 == if{ (A:Airspeed indicated, knot) s1 (G:Var1) - 0.1 / 10 * l1 + (>G:Var3) }	</Value>  </Select></Element><Element>  <Position X="0" Y="0"/>  <Visible>	(G:Var3) (A:Airspeed indicated, knot) >  </Visible>  <MaskImage Name="EADI_TREND_UP_MASK.bmp" Bright="Yes">	<Axis X="43" Y="89.5"/>  </MaskImage>  <Image Name="EADI_TREND_UP.bmp" Bright="Yes">	<Nonlinearity>	  <Item Value="2" X="5" Y="0"/>	  <Item Value="50" X="5" Y="90"/>	</Nonlinearity>  </Image>  <Shift>	<Value Minimum="2" Maximum="50">	  (A:Airspeed indicated, knot) 45 < if{ 0 } els{ (G:Var3) (A:Airspeed indicated, knot) - }	</Value>	<Delay PixelsPerSecond="10"/>  </Shift></Element><Element>  <Position X="0" Y="0"/>  <Visible>	(G:Var3) (A:Airspeed indicated, knot) <   </Visible>  <MaskImage Name="EADI_TREND_DN_MASK.bmp" Bright="Yes">	<Axis X="43" Y="89.5"/>  </MaskImage>  <Image Name="EADI_TREND_DN.bmp" Bright="Yes">	<Nonlinearity>	  <Item Value="2" X="5" Y="90"/>	  <Item Value="-50" X="5" Y="0"/>	</Nonlinearity>  </Image>  <Shift>	<Value Minimum="-50" Maximum="2">	  (A:Airspeed indicated, knot) 45 < if{ 0 } els{ (G:Var3) (A:Airspeed indicated, knot) - }	</Value>	<Delay PixelsPerSecond="10"/>  </Shift></Element>