taisei/src/move.h

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/*
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* This software is licensed under the terms of the MIT License.
* See COPYING for further information.
* ---
* Copyright (c) 2011-2019, Lukas Weber <laochailan@web.de>.
* Copyright (c) 2012-2019, Andrei Alexeyev <akari@taisei-project.org>.
*/
#ifndef IGUARD_move_h
#define IGUARD_move_h
#include "taisei.h"
/*
* Simple generalized projectile movement based on laochailan's idea
*/
typedef struct MoveParams {
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cmplx velocity, acceleration, retention;
cmplx attraction;
cmplx attraction_point;
double attraction_max_speed;
} MoveParams;
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cmplx move_update(cmplx *restrict pos, MoveParams *restrict params);
cmplx move_update_multiple(uint times, cmplx *restrict pos, MoveParams *restrict params);
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INLINE MoveParams move_linear(cmplx vel) {
return (MoveParams) { vel, 0, 1 };
}
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INLINE MoveParams move_accelerated(cmplx vel, cmplx accel) {
return (MoveParams) { vel, accel, 1 };
}
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INLINE MoveParams move_asymptotic(cmplx vel0, cmplx vel1, cmplx retention) {
// NOTE: retention could be derived by something like: exp(-1 / halflife)
return (MoveParams) { vel0, vel1 * (1 - retention), retention };
}
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INLINE MoveParams move_asymptotic_simple(cmplx vel, double boost_factor) {
// NOTE: this matches the old asymptotic rule semantics exactly
double retention = 0.8;
return move_asymptotic(vel * (1 + boost_factor * retention), vel, retention);
}
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INLINE MoveParams move_towards(cmplx target, cmplx attraction) {
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return (MoveParams) {
.attraction = attraction,
.attraction_point = target,
};
}
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INLINE MoveParams move_stop(cmplx retention) {
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return (MoveParams) { .retention = retention };
}
#endif // IGUARD_move_h