core/src/cpp/animation.cpp


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#include "animation.h"

Animation::Animation(
    SDL_Renderer* renderer,
    const std::string& filename,
    const int width,
    const double durationS,
    const bool repeat
)
    : Sprite{renderer, filename, width}
    , durationS{durationS}
    , repeat{repeat}
{
}

bool Animation::animation_ended(const TimeStamp timestamp) const
{
    double elapsed = std::chrono::duration<double>(Clock::now() - timestamp)
                         .count();  // seconds from timestamp to now
    return !repeat && elapsed >= durationS;
}

int Animation::frame(const TimeStamp timestamp) const
{
    // seconds from timestamp to now
    double elapsed =
        std::chrono::duration<double>(Clock::now() - timestamp).count();
    // FIXME: division by zero
    int idx = static_cast<int>(nframes * elapsed / durationS);

    return repeat ? idx % nframes : std::min(idx, nframes - 1);
}

SDL_Rect Animation::rect(const TimeStamp timestamp) const
{
    return {frame(timestamp) * width, 0, width, height};
}