Well.. I'm guessing it's to hard or impossible then.. :/
On Sep 17, 2010, at 9:56 PM, Pedro Teixeira wrote:
Hi everyone... I'm back with the same issue for the last couple of days… I'm trying to create a compass for my application BUT the difference is that, instead of having a line always pointing to north, I want this line to point for a specific point. I've been trying dozens of algorithms and nothing works.. I've finally found one that points me exactlly to the point I want.. BUT it doesn't move if I change the position of the device which is my objective.. basicly, what I want is that no matter the direction I'm using my device.. the line always point me to the point (picLatitude,picLongitude)… I understood that for the line to move, I can't use static variables… I need to use the values offered by the onSensorChanged(SensorEvent event). This are the data I have available: event.values[0]: azimuth, rotation around the Z axis (device in relation to north, 0º) event.values[1]: pitch, rotation around the X axis event.values[2]: roll, rotation around the Y axis mLatitude: device current latitude gottern from GPS (variable) mLongitude: device current longitude gotten from GPS (variable) picLatitude: static picture latitude established previously picLongitude: static picture longitude established previously distance: distance in Km from device to the picture calculated previously And this the formula that works correct, and gives me the correct angle.. ( BUT IT DOESN'T USE ANY OF THE SENSOR DATA SO THE LINE COMPASS DOESNT MOVE): double dLong = picLongitude - mLongitude; double y = (Math.sin(dLong) * Math.cos(picLatitude)); double x = (Math.cos(mLatitude) * Math.sin(picLatitude) - Math.sin(mLatitude)*Math.cos(picLatitude)*Math.cos(dLong)); double angleDegreesWrongRange = Math.abs(Math.toDegrees(Math.atan2(y, x))); float angleDegrees = (float) ((angleDegreesWrongRange+360) % 360); myCompass.updateDirection(angleDegrees); I got this "bearing" formula from this website: http://www.movable-type.co.uk/scripts/latlong.html Can someone please help me with this? I've try adding, subtracting… the azimuth.. I've tried with the others.. seriously at this point I'm just demoralized.. Thank you in advance -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Pedro Teixeira www.pedroteixeira.org -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
