Unable to create horizontal bar graphs

[Former user]

I have been trying to display the bar graph as horizontal, but it still turns up as vertical

Heres my xml.

<com.echo.holographlibrary.BarGraph
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:id="@+id/bargraph"
        android:layout_margin="@dimen/default_margin"
        app:barAxisColor="@color/transparent_blue"
        app:barShowText="true"
        app:orientation="horizontal"
        app:barShowAxis="true"/>

Can you help me out?