指南针demo

[java]代码库

public class CompassActivity extends Activity implements Renderer, SensorEventListener {
    private GLSurfaceView mGLSurfaceView;
    private SensorManager mSensorManager;
    private float[] mGData = new float[3];
    private float[] mMData = new float[3];
    private float[] mR = new float[16];
    private float[] mI = new float[16];
    private FloatBuffer mVertexBuffer;
    private FloatBuffer mColorBuffer;
    private ByteBuffer mIndexBuffer;
    private float[] mOrientation = new float[3];
    private int mCount;

    public CompassActivity() {
    }

    /** Called with the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mSensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE);
        mGLSurfaceView = new GLSurfaceView(this);
        mGLSurfaceView.setRenderer(this);
        setContentView(mGLSurfaceView);
    }

    @Override
    protected void onResume() {
        super.onResume();
        mGLSurfaceView.onResume();
        Sensor gsensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        Sensor msensor = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
        mSensorManager.registerListener(this, gsensor, SensorManager.SENSOR_DELAY_GAME);
        mSensorManager.registerListener(this, msensor, SensorManager.SENSOR_DELAY_GAME);
    }

    @Override
    protected void onPause() {
        super.onPause();
        mGLSurfaceView.onPause();
        mSensorManager.unregisterListener(this);
    }

    public void onDrawFrame(GL10 gl) {

        gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);

        /*
         * Now we're ready to draw some 3D objects
         */

        gl.glMatrixMode(GL10.GL_MODELVIEW);
        gl.glLoadIdentity();
        gl.glTranslatef(0, 0, -2);

        gl.glMultMatrixf(mR, 0);
        // some test code which will be used/cleaned up before we ship this.
        //gl.glMultMatrixf(mI, 0);

        gl.glVertexPointer(3, GL_FLOAT, 0, mVertexBuffer);
        gl.glColorPointer(4, GL_FLOAT, 0, mColorBuffer);
        gl.glDrawElements(GL_LINES, 6, GL_UNSIGNED_BYTE, mIndexBuffer);
    }

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