Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import android.hardware.SensorEvent;
import android.hardware.SensorManager;
import android.opengl.Matrix;

import android.util.Log;
import android.view.Surface;

public class Main {
    private static final String TAG = "VRUtil";
    private static float[] sUIThreadTmp = new float[16];
    private static float[] sTruncatedVector = new float[4];
    private static boolean sIsTruncated = false;

    public static void sensorRotationVector2Matrix(SensorEvent event, int rotation, float[] output) {
        if (!sIsTruncated) {
            try {
                SensorManager.getRotationMatrixFromVector(sUIThreadTmp, event.values);
            } catch (Exception e) {
                // On some Samsung devices, SensorManager#getRotationMatrixFromVector throws an exception
                // if the rotation vector has more than 4 elements. Since only the four first elements are used,
                // we can truncate the vector without losing precision.
                Log.e(TAG, "maybe Samsung bug, will truncate vector");
                sIsTruncated = true;
            }
        }

        if (sIsTruncated) {
            System.arraycopy(event.values, 0, sTruncatedVector, 0, 4);
            SensorManager.getRotationMatrixFromVector(sUIThreadTmp, sTruncatedVector);
        }

        float[] values = event.values;
        switch (rotation) {
        case Surface.ROTATION_0:
        case Surface.ROTATION_180: /* Notice: not supported for ROTATION_180! */
            SensorManager.getRotationMatrixFromVector(output, values);
            break;
        case Surface.ROTATION_90:
            SensorManager.getRotationMatrixFromVector(sUIThreadTmp, values);
            SensorManager.remapCoordinateSystem(sUIThreadTmp, SensorManager.AXIS_Y, SensorManager.AXIS_MINUS_X,
                    output);
            break;
        case Surface.ROTATION_270:
            SensorManager.getRotationMatrixFromVector(sUIThreadTmp, values);
            SensorManager.remapCoordinateSystem(sUIThreadTmp, SensorManager.AXIS_MINUS_Y, SensorManager.AXIS_X,
                    output);
            break;
        }
        Matrix.rotateM(output, 0, 90.0F, 1.0F, 0.0F, 0.0F);
    }
}