Hi all,
I'm facing a problem, wich I do not understand.
I need to find the angle between 2 points . The ideia is to detect turns above a certain angle during motion.
I have this little piece of code in GPS_LocationChanged (there is more code there, but is not relevant to this problem).
PointC_lat & pointC_long hold the coordinates of the previous detected point.
pontoA_long, PontoA_lat, PontoC_long and PontoC_lat are all global variables.
The distance between the points is small, between 30 to 300 meters, depending on speed.
GPS_LocationChanged (Location1 As Location)
pontoA_lat=Location1.Latitude
pontoA_long=Location1.Longitude
Private y As Float
Private x As Float
Private angulo As Float
y=(pontoA_lat-pontoC_lat)
x=Cos(cPI/180*pontoC_lat)*(pontoA_long-pontoC_long)
angulo=ATan2(y,x)
Label5.Text=Round2(angulo*(180/cPI),1)
end sub
First of all the value never stays put. Even with the device on a stable surface the value keeps changing in almost a random way. (it can be -146, 10,64,-110, or whatever)
Second it does not correlate in any form with the angle of movement if I actualy start moving around to test,
I also tryed with bearing to...but no luck in getting the angle.
Anyone there to help me out understanding this behaviour ?
Many thanks
JM