Distorted Android

import android.content.Context;

import android.opengl.GLSurfaceView;

import android.util.AttributeSet;

import android.view.MotionEvent;

import android.widget.Toast;

                                       float rz = mRenderer.mQuat2.getZ();

                                       float rw = mRenderer.mQuat2.getW();

                                       // is now equal to (qx,qy,qz,qw)*(rx,ry,rz,rw)

                                       float tx = rw*qx - rz*qy + ry*qz + rx*qw;

                                       float ty = rw*qy + rz*qx + ry*qw - rx*qz;