public void setWaveShiftRatio(float waveShiftRatio) {
        if (mWaveShiftRatio != waveShiftRatio) {
            mWaveShiftRatio = waveShiftRatio;
            invalidate();
        }
    }
Shift the wave horizontally according to <code>waveShiftRatio</code>.

@param waveShiftRatio Should be 0 ~ 1. Default to be 0.
                      Result of waveShiftRatio multiples width of WaveView is the length to shift.
library/src/main/java/com/gelitenight/waveview/library/WaveView.java