touch 滑动 单指 拖动

拖动平移代码：

    @Override
    public boolean onTouchEvent(MotionEvent me) {
        //处理手指滑动事件，我这里的处理是判断手指在横向和竖向滑动的距离
        //这个距离隐射到球体上经度和纬度的距离，根据这个距离计算三维空间的两个
        //夹角，根据这个夹角调整摄像机所在位置
        if (me.getAction() == MotionEvent.ACTION_DOWN) {
            startRawX = me.getRawX();
            startRawY = me.getRawY();
        } else if (me.getAction() == MotionEvent.ACTION_MOVE) {

            float distanceX = startRawX - me.getRawX();
            float distanceY = startRawY - me.getRawY();

            //这里的0.1f是为了不上摄像机移动的过快
            distanceY = 0.1f * (distanceY) / getWindowManager().getDefaultDisplay().getHeight();

            yFlingAngleTemp = distanceY * 180 / (Math.PI * 3);

            if (yFlingAngleTemp + yFlingAngle > Math.PI / 2) {
                yFlingAngleTemp = Math.PI / 2 - yFlingAngle;
            }
            if (yFlingAngleTemp + yFlingAngle < -Math.PI / 2) {
                yFlingAngleTemp = -Math.PI / 2 - yFlingAngle;
            }
            //这里的0.1f是为了不上摄像机移动的过快
            distanceX = 0.1f * (-distanceX) / getWindowManager().getDefaultDisplay().getWidth();
            xFlingAngleTemp = distanceX * 180 / (Math.PI * 3);


            mAngleX = (float) (Math.cos(yFlingAngle + yFlingAngleTemp) * Math.sin(xFlingAngle + xFlingAngleTemp));

            mAngleY = -(float) (Math.sin(yFlingAngle + yFlingAngleTemp));


            mAngleZ = (float) (Math.cos(yFlingAngle + yFlingAngleTemp) * Math.cos(xFlingAngle + xFlingAngleTemp));

            glSurfaceView.requestRender();
        } else if (me.getAction() == MotionEvent.ACTION_UP) {
            xFlingAngle += xFlingAngleTemp;
            yFlingAngle += yFlingAngleTemp;
        }
        return true;
    }