OpenSpace/modules/base/scale/timelinescale.cpp

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 * OpenSpace                                                                             *
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#include <modules/base/scale/timelinescale.h>

#include <openspace/documentation/documentation.h>
#include <openspace/documentation/verifier.h>
#include <openspace/scene/scene.h>
#include <openspace/util/updatestructures.h>
#include <openspace/util/time.h>
#include <optional>

namespace {
    constexpr openspace::properties::Property::PropertyInfo ShouldInterpolateInfo = {
        "ShouldInterpolate",
        "Should Interpolate",
        "If this value is set to 'true', an interpolation is applied between the given "
        "keyframes. If this value is set to 'false', the interpolation is not applied.",
        openspace::properties::Property::Visibility::AdvancedUser
    };

    // This `Scale` uses a timeline of other `Scale` classes to calculate the final
    // scale factor for the attached scene graph node. The current in-game time is used to
    // determine which specific keyframe to currently use. It is also possible to
    // interpolate between two adjacent keyframes.
    struct [[codegen::Dictionary(TimelineScale)]] Parameters {
        // A table of keyframes, with keys formatted as YYYY-MM-DDTHH:MM:SS and values
        // that are valid Scale objects.
        std::map<std::string, ghoul::Dictionary> keyframes
            [[codegen::reference("core_transform_scale")]];

        // [[codegen::verbatim(ShouldInterpolateInfo.description)]]
        std::optional<bool> shouldInterpolate;
    };
#include "timelinescale_codegen.cpp"
} // namespace

namespace openspace {

documentation::Documentation TimelineScale::Documentation() {
    return codegen::doc<Parameters>("base_transform_scale_keyframe");
}

TimelineScale::TimelineScale(const ghoul::Dictionary& dictionary)
    : Scale(dictionary)
    , _shouldInterpolate(ShouldInterpolateInfo, true)
{
    const Parameters p = codegen::bake<Parameters>(dictionary);

    for (const std::pair<const std::string, ghoul::Dictionary>& kf : p.keyframes) {
        const double t = Time::convertTime(kf.first);

        ghoul::mm_unique_ptr<Scale> scale = Scale::createFromDictionary(kf.second);
        scale->setIdentifier(makeIdentifier(kf.first));
        addPropertySubOwner(scale.get());
        _timeline.addKeyframe(t, std::move(scale));
    }

    _shouldInterpolate = p.shouldInterpolate.value_or(_shouldInterpolate);
    addProperty(_shouldInterpolate);
}

void TimelineScale::update(const UpdateData& data) {
    const double now = data.time.j2000Seconds();
    using KeyframePointer = const Keyframe<ghoul::mm_unique_ptr<Scale>>*;

    if (KeyframePointer prev = _timeline.lastKeyframeBefore(now, true);  prev) {
        prev->data->update(data);
    }
    if (KeyframePointer next = _timeline.firstKeyframeAfter(now, true);  next) {
        next->data->update(data);
    }
}

glm::dvec3 TimelineScale::scaleValue(const UpdateData& data) const {
    const double now = data.time.j2000Seconds();
    using KeyframePointer = const Keyframe<ghoul::mm_unique_ptr<Scale>>*;

    KeyframePointer prev = _timeline.lastKeyframeBefore(now, true);
    KeyframePointer next = _timeline.firstKeyframeAfter(now, true);

    if (!prev && !next) {
        return glm::dvec3(0.0);
    }
    if (!prev) {
        prev = next;
    }
    if (!next) {
        next = prev;
    }
    const double prevTime = prev->timestamp;
    const double nextTime = next->timestamp;

    if (_shouldInterpolate) {
        double t = 0.0;
        if (nextTime - prevTime > 0.0) {
            t = (now - prevTime) / (nextTime - prevTime);
        }
        return glm::mix(prev->data->scaleValue(data), next->data->scaleValue(data), t);
    }
    else {
        if (prevTime <= now && now < nextTime) {
            return prev->data->scaleValue(data);
        }
        else if (nextTime <= now) {
            return next->data->scaleValue(data);
        }
    }
    return glm::dvec3(0.0);
}

} // namespace openspace