Single needle altimeter shows strange values

[Guest Matthias Lieberecht]

Hi All,I have a problem with a simple single needle altimeter (similar to the Boeing 747 standby altimeter). The needle shows a wrong value in higher altitudes. For example: If I'm on ground the needle is at position 6 (for 600 feet) which is correct. At about 13000 feet the needle shows 8 (should be on 0). At 24000 feet the needle shows 7. The higher the altitude is the larger is the aberration. This is not only on my computer. I've uploaded a panel a couple of time ago where another Flightsimmer had the ame problem with my altimeter. I do absolutely not know why. The gauge based on the standby 747 altimeter just with some other bitmaps. Here's the code for the needle:(A:Indicated Altitude,feet)I've also tried to add more reference points for the needle. But the more points I add the worse it gets. The positions for the bitmap are correct. I'm absulutely perplexed and hope anybody could help.Best RegardsMatthias

[Guest Matthias Lieberecht]

BTW: Here's a screenshot of the altimeter at 24000 where you cann see what I mean.http://forums.avsim.com/user_files/16967.jpg

[Guest]

Aside from the pivot point needing to be X="11.5" (1/2 of 23!), I cannot spot anything obvious without seeing all the code...The only suggestion would be to try different values for the 500's Y=" " coordinate value. You cannot always rely on determining the values from your paint program... At that scale, it only takes one or two pixels difference to ruin the calibration! :)BillAVSIM OmbudsmanFounder and Director,Creative Recycling of Aircraft Partshttp://catholic-hymns.com/frbill/FS2002/images/fartslogo.jpg

[Guest Eugen]

Hi Matthias,Have you checked your settings International metric feet is what I use , I recall that I had a simular problem a while ago.I include my code which works to compare(A:Indicated Altitude,feet)

[phjvh 0]

Hi,Something with the failures?Jan"Procul Negotiis"

[Guest Matthias Lieberecht]

Hi All,Thanks to all for your help. It sound funny, but Bill, you were right! It's fact that "0" and "500" is at 130 and the center of the needle is at 10 points. But when I change "0" and "500" to position 128 (the exact center position of the bitmap) and if I use 11.5 for the needle (exact center position of the needle bitmap) everything works as it should. Well, the only thing now to to is to correct the bitmaps but this is no problem.Best RegardsMatthias

[Guest]

>Hi All,>>Thanks to all for your help. It sound funny, but Bill, you>were right! It's fact that "0" and "500" is at 130 and the>center of the needle is at 10 points. But when I change "0">and "500" to position 128 (the exact center position of the>bitmap) and if I use 11.5 for the needle (exact center>position of the needle bitmap) everything works as it should.>Well, the only thing now to to is to correct the bitmaps but>this is no problem.It's amazing what effect only 0.5 pixels will do... :) Well, that and the x,y coordinates in the non-linear table... I'm glad you got it sorted out!BillAVSIM OmbudsmanFounder and Director,Creative Recycling of Aircraft Partshttp://catholic-hymns.com/frbill/FS2002/images/fartslogo.jpg