Compass event.magneticHeading

oleg · November 2019

How do i determine the direction of rotation of the compass? strilka:setRotation(-mn) or strilka:setRotation(+mn)
It seems to me that the direction is chosen at random when the program starts..

local background = Bitmap.new(Texture.new("compass-background.png"))
 strilka = Bitmap.new(Texture.new("compass-pointer.png", true))
strilka:setAnchorPoint(0.5, 0.5)
 
stage:addChild(background)
stage:addChild(strilka)
 
background:setPosition(10, 40)
strilka:setPosition(160, 210)
 
geolocation = Geolocation.new()
local filter =0.03
magnetic=0
local function onHeadingUpdate(event)
	 magnetic=event.magneticHeading
 
	mn=magnetic*filter+mn * (1-filter)
-- An error occurs here  !!!!!!!!!!!!!!
--Each time you restart, the direction of the scale changes randomly (by time - versus time)
 
	strilka:setRotation(-mn)
	--strilka:setRotation(mn)
end
geolocation:addEventListener(Event.HEADING_UPDATE, onHeadingUpdate)
geolocation:start()

MoKaLux · November 2019

on android, sometimes the compass needs to be calibrated.
To calibrate the compass we turn the phone to form a 8 shape.
I don't know if it's related to your question.

oleg · November 2019

MoKaLux said:
on android, sometimes the compass needs to be calibrated.
To calibrate the compass we turn the phone to form a 8 shape.
I don't know if it's related to your question.

Must be rotated to correctly determine the azimuth.
I have another problem - the compass is confusing west and east

Think this is a error in gideros

hgy29 · November 2019

oleg said:

I have another problem - the compass is confusing west and east

Think this is a error in gideros

It gives expected results in my apps (gps navigation)

oleg · November 2019

hgy29 said:

oleg said:

I have another problem - the compass is confusing west and east

Think this is a error in gideros
It gives expected results in my apps (gps navigation)

I don't use GPS
I only use a magnetic sensor

oleg · November 2019

I found the code, is it possible in gideros to get sensor data x, y, z?

float x = event.values[0];
float y = event.values[1];
float z = event.values[2];

I want to use another formula instead:
double magneticHeading = (Math.atan2(x, -y) + Math.PI) * (180 / Math.PI);

public void startUpdatingHeading()
	{
		WeakActivityHolder.get().runOnUiThread(new Runnable()
		{
			<a href="https://forum.giderosmobile.com/profile/Override" rel="nofollow">@Override</a>
			public void run()
			{
				if (magneticSensor == null)
					return;
 
				if (magneticListener_ != null)
					return;
 
				magneticListener_ = new SensorEventListener() {
					<a href="https://forum.giderosmobile.com/profile/Override" rel="nofollow">@Override</a>
					public void onAccuracyChanged(Sensor sensor, int accuracy) { }
 
					<a href="https://forum.giderosmobile.com/profile/Override" rel="nofollow">@Override</a>
					public void onSensorChanged(SensorEvent event)
					{
				        float x = event.values[0];
				        float y = event.values[1];
				        float z = event.values[2];
 
				        double magneticHeading = (Math.atan2(x, -y) + Math.PI) * (180 / Math.PI);
 
						onHeadingChanged(magneticHeading, magneticHeading);
					}			
				};
 
				sensorManager.registerListener(magneticListener_, magneticSensor, SensorManager.SENSOR_DELAY_NORMAL);
			}
		});		
	}

hgy29 · November 2019

oleg said:

hgy29 said:

It gives expected results in my apps (gps navigation)
I don't use GPS
I only use a magnetic sensor

I use both, and magnetic sensor reporting is correct, I use it to rotate the on screen map when the user turns. If you change the formula, my apps won’t work anymore.

oleg · November 2019

hgy29 said:

oleg said:

hgy29 said:

It gives expected results in my apps (gps navigation)
I don't use GPS
I only use a magnetic sensor
I use both, and magnetic sensor reporting is correct, I use it to rotate the on screen map when the user turns. If you change the formula, my apps won’t work anymore.

You do not need to change the formula, you need to add the event x, y, z
And with additional data I can directly process the sensor data
Now a number sign is confused on one axis.And in the accelerometer, too, along one axis, the number sign is tangled,

Don't change anything in Gsderos but just add to event event.magneticHeading events on axes event.X, event.Y event.Z

hgy29 · November 2019

oleg said:

Don't change anything in Gsderos but just add to event event.magneticHeading events on axes event.X, event.Y event.Z

Good idea, might be useful for other things too.

antix · November 2019

One thing about the compass... EVERY one I download has no f**king ability to tell if it is in the southern hemisphere... hence they all point the wrong way!!! Even the Gideros example does this heheh

oleg · November 2019

antix said:
One thing about the compass... EVERY one I download has no f**king ability to tell if it is in the southern hemisphere... hence they all point the wrong way!!! Even the Gideros example does this heheh

Thanks, i will consider this when i make my compass

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