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/*
 * Copyright (c) 2020, 2022, 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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
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 */

package com.sun.scenario.animation.shared;

import javafx.animation.Animation;

/**
 * Clip envelope for multi-cycle animations. In this case, autoReverse and cyclePosition (which can be different from ticks)
 * are important.
 */
abstract class MultiLoopClipEnvelope extends ClipEnvelope {

    protected boolean autoReverse;

    /**
     * The current position of the play head in its current cycle.
     * cyclePos = ticks % cycleTicks, so 0 <= cyclePos <= cycleTicks.
     */
    protected long cyclePos;

    protected MultiLoopClipEnvelope(Animation animation) {
        super(animation);
    }

    protected boolean isAutoReverse() {
        return autoReverse;
    }

    @Override
    public void setAutoReverse(boolean autoReverse) {
        this.autoReverse = autoReverse;
    }

    @Override
    protected long ticksRateChange(double newRate) {
        return Math.round((ticks - deltaTicks) * Math.abs(newRate / rate));
     }

    protected boolean isDirectionChanged(double newRate) {
        return newRate * rate < 0;
    }

    protected boolean isDuringEvenCycle() {
        return ticks % (2 * cycleTicks) < cycleTicks;
    }
}