class bb_numinterpolator : object
    {
    int mCurrentValue;
    int mMaxChange;

    private bool negative;
    private String numString;
    private String buildingString;
    private int curPlace;

    static bb_numinterpolator Create(int startval, int maxchange)
        {
        let v = new("bb_numinterpolator");
        v.mCurrentValue = startval;
        v.mMaxChange = maxchange;
        return v;
        }

    void Reset(int value)
        {
        mCurrentValue = value;
        }

    void Update(int destvalue)
        {
        numString = String.format("%d", abs(destvalue));
        if (mCurrentValue > destvalue)
            {
            //
            // don't interpolate decrementing values.
            mCurrentValue = destvalue;
            }
        else
            {
            String operatingChar = numString.charAt(curPlace);
            int operatingInt = operatingChar.toInt();

            if (operatingInt <= buildingString.charAt(curPlace).toInt()) curPlace++;

            int buildingInt = buildingString.toInt();
            int intLength = numString.length();
            if (numString.toInt() < 0) intLength--;
            buildingInt += 10 ** (intLength - curPlace - 1);

            mCurrentValue += buildingInt;
            }
        }

    int GetValue()
        {
        return mCurrentValue;
        }
    }

        // defined in the namespace of bb_hud
        bb_numinterpolator bb_echointerpolator;

        // called in Init();
        bb_echointerpolator = bb_numinterpolator.Create(0,1);

        // called in NewGame();
        bb_echointerpolator.Reset(0);

        //called in Tick();
        bb_echointerpolator.Update(CPlayer.mo.CountInv("bb_BloodEchoes"));

        //called in Draw();
        DrawString(bb_numfont, FormatNumber(bb_echointerpolator.GetValue(),9), (-38,26), DI_TEXT_ALIGN_RIGHT|DI_SCREEN_RIGHT_TOP,font.CR_WHITE);