integrated()

TimeMap MayaFlux::Kinesis::TimeMaps::integrated ( double  start, std::shared_ptr< const double >  velocity  )

inline

Position that integrates a velocity you can change while it plays.

Parameters

start	Position at time zero
velocity	Position units per second, read at every evaluation. Negative reverses and zero holds.

The position carries on from wherever it is when the velocity changes, so speeding up, slowing down, reversing or stopping never jumps. Unlike the other factories this map keeps a running position, so give each voice its own instance. Time going backwards restarts it from start.

Definition at line 113 of file TimeMap.hpp.

{
    struct State {
        double position;
        double last;
    };
 
    auto state = std::make_shared<State>(State { .position = start, .last = 0.0 });
 
    return { .fn = [state, start, velocity = std::move(velocity)](const double& t) -> double {
        if (t < state->last) {
            state->position = start;
            state->last = 0.0;
        }
 
        state->position += *velocity * (t - state->last);
        state->last = t;
        return state->position;
    } };
}

References MayaFlux::Kinesis::Tendency< D, R >::fn, position, and MayaFlux::Kinesis::velocity().

Referenced by MayaFlux::Kriya::TapSetBuilder::start().

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