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Code Issues Releases Wiki Activity

Add a moving average to the compass to smooth it out.

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This commit is contained in:
DjBushido 2014-04-24 17:18:31 -04:00
parent 17fe4df01a
commit 1f89681dc1
1 changed files with 21 additions and 1 deletions
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22
UNCCScavenger/src/edu/uncc/scavenger/CompassActivity.java
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@ -11,6 +11,9 @@ package edu.uncc.scavenger;
* stackoverflow.com/questions/5479753/using-orientation-sensor-to-point-towards-a-specific-location
*/
import java.util.ArrayList;
import java.util.List;
import edu.uncc.scavenger.rest.RestLocation;
import android.app.Activity;
import android.content.Context;
@ -33,6 +36,7 @@ import android.widget.Toast;
public class CompassActivity extends Activity implements SensorEventListener
{
final int SEARCH_PROXIMITY = 10;
final int MOVING_AVERAGE_SIZE = 10;
ImageView compassRoseView, arrowView, searchImageView;
Button backButton;
SensorManager sManager;
@ -44,6 +48,7 @@ public class CompassActivity extends Activity implements SensorEventListener
float[] gravity = new float[3];
float[] magneticField = new float[3];
float[] coordinates = new float[3];
ArrayList<Float> rotationAverage = new ArrayList<Float>(MOVING_AVERAGE_SIZE);
LocationManager locationManager;
DirectionListener locationListener;
Location searchLocation;
@ -160,10 +165,17 @@ public class CompassActivity extends Activity implements SensorEventListener
float trueHeading = (float)(Math.toDegrees(compassValues[0]) + locationListener.getDeclination());
//Calculate bearing to search location
float rotateArrow = (float) (trueHeading - locationListener.getBearing());
// Take moving average of bearing to smooth it out
if (rotationAverage.size() == MOVING_AVERAGE_SIZE) {
rotationAverage.remove(0);
}
rotationAverage.add(rotateArrow);
float finalRotation = findAverage(rotationAverage);
//Rotate compass and arrow. Rotations must be opposite to counteract device movement
compassRoseView.setRotation((long)(-1 * trueHeading));
arrowView.setRotation((long)(-1 * rotateArrow));
arrowView.setRotation((long)(-1 * finalRotation));
if(locationListener.getDistance() <= SEARCH_PROXIMITY)
{
@ -184,4 +196,12 @@ public class CompassActivity extends Activity implements SensorEventListener
// TODO Auto-generated method stub
}
private float findAverage(List<Float> list) {
float sum = 0.0f;
for (Float f : list) {
sum += f;
}
return sum / list.size();
}
}