/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
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 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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#include "sky/engine/core/animation/animatable/AnimatableDouble.h"

#include <math.h>
#include "sky/engine/platform/animation/AnimationUtilities.h"

namespace blink {

bool AnimatableDouble::usesDefaultInterpolationWith(const AnimatableValue* value) const
{
    const AnimatableDouble* other = toAnimatableDouble(value);
    return (m_constraint == InterpolationIsNonContinuousWithZero) && (!m_number || !other->m_number);
}

PassRefPtr<AnimatableValue> AnimatableDouble::interpolateTo(const AnimatableValue* value, double fraction) const
{
    const AnimatableDouble* other = toAnimatableDouble(value);
    ASSERT(m_constraint == other->m_constraint);
    if ((m_constraint == InterpolationIsNonContinuousWithZero) && (!m_number || !other->m_number))
        return defaultInterpolateTo(this, value, fraction);
    return AnimatableDouble::create(blend(m_number, other->m_number, fraction));
}

bool AnimatableDouble::equalTo(const AnimatableValue* value) const
{
    return m_number == toAnimatableDouble(value)->m_number;
}

double AnimatableDouble::distanceTo(const AnimatableValue* value) const
{
    const AnimatableDouble* other = toAnimatableDouble(value);
    return fabs(m_number - other->m_number);
}

} // namespace blink