public void setAmplitudeRatio(float amplitudeRatio) {
        if (mAmplitudeRatio != amplitudeRatio) {
            mAmplitudeRatio = amplitudeRatio;
            invalidate();
        }
    }
Set vertical size of wave according to <code>amplitudeRatio</code>

@param amplitudeRatio Default to be 0.05. Result of amplitudeRatio + waterLevelRatio should be less than 1.
                      Ratio of amplitude to height of WaveView.
library/src/main/java/com/gelitenight/waveview/library/WaveView.java