QtSensors convert azimuth to angle
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Hello,
I am trying to make a compass application using QtSensors 5.0, I am able to get azimuth value from the compass but I can't seem to find a proper formula to convert azimuth into a rotation angle for an image of a compass needle. Would anyone have any idea of what formula I need to use to get a proper rotation angle?My code below
@ property real readAz: 0
property real angle: 0
Compass { id: compass dataRate: 1 active: true onReadingChanged: { readAz = reading.azimuth angle = (readAz /(2*Math.PI)) print("Compass: ", reading.azimuth) //for debug print("Angle: ", angle) //for debug needle.update() } }@
thank you
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Not sure what angle you need, but azimuth is typically measured from North going clockwise. In typical cartesian graphics, angle is measure from the x-axis (East) going counterclockwise.
So, North is an azimuth of 0, but an angle of 90 (PI/2). East is an azimuth of 90 (PI/2) but an angle of 0.
So if that's what you mean, then the angle is 90-azimuth. If you want all angles to be positive, just add 360 (2*PI) to negative angles.
Glenn