/*
 * Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package org.graalvm.visualvm.lib.ui.charts;


/**
 *
 * @author  Jiri Sedlacek
 */
public class DecimalAxisUtils {
    //~ Static fields/initializers -----------------------------------------------------------------------------------------------

    private static final long[] timeUnitsGrid = new long[] { 1, 2, 5 };

    //~ Methods ------------------------------------------------------------------------------------------------------------------

    public static long getOptimalUnits(double factor, int minimumVerticalMarksDistance) {
        if (factor <= 0) {
            return 0;
        }

        long decimalFactor = 1;

        while (true) {
            for (int i = 0; i < timeUnitsGrid.length; i++) {
                if ((timeUnitsGrid[i] * decimalFactor * factor) >= minimumVerticalMarksDistance) {
                    return timeUnitsGrid[i] * decimalFactor;
                }
            }

            decimalFactor *= 10;
        }
    }
}
