How is right to rotate castom seekbar?

Question

GitHub has the exelent sample with 1300 stars how to customise seekbar, but there aren't way to rotate it from horizontly to verticaly...

when i try to add

android:rotation="-90"

it is crazy rotate, but it still take a space like horizontal seekbar .

Next step i have tryed overide the seekbar :

public class VerticalDiscreteSeekBar extends DiscreteSeekBar {
public VerticalDiscreteSeekBar(Context context) {
    super(context);
}

public VerticalDiscreteSeekBar(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public VerticalDiscreteSeekBar(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
}

protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(h, w, oldh, oldw);
}

@Override
protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(heightMeasureSpec, widthMeasureSpec);
    setMeasuredDimension(getMeasuredHeight(), getMeasuredWidth());
}

protected void onDraw(Canvas c) {
    c.rotate(-90);
    c.translate(-getHeight(), 0);

    super.onDraw(c);
}

@Override
public boolean onTouchEvent(MotionEvent event) {
    if (!isEnabled()) {
        return false;
    }

    switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN:
        case MotionEvent.ACTION_MOVE:
        case MotionEvent.ACTION_UP:
            setProgress(getMax() - (int) (getMax() * event.getY() / getHeight()));
            onSizeChanged(getWidth(), getHeight(), 0, 0);

            break;

        case MotionEvent.ACTION_CANCEL:
            break;
    }
    return true;
}
}

XML is

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".tools.TestDeleteIt">

<com.example.android.camera2basic.tools.VerticalDiscreteSeekBar
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:dsb_thumbColor="@color/color_white"
    app:dsb_indicatorColor="@color/color_white"
    app:dsb_indicatorFormatter="%03d"
      app:dsb_indicatorTextAppearance="@style/CustomFloaterTextAppearance"
    app:dsb_max="14"
    app:dsb_min="-14"
    app:dsb_progressColor="@color/ntz_color_yellow"
    app:dsb_rippleColor="@color/ntz_color_yellow"
    app:dsb_scrubberHeight="10dp"
    app:dsb_thumbSize="25dp"
    app:dsb_trackColor="@color/ntz_color_yellow"
    app:dsb_trackHeight="10dip"/>
</LinearLayout>

eventualy it is looks so (it is show just shape, but without real view)

What am i doing wrong? How i can make it working?