63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
/******************************************************************************
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Copyright (C) 2013 by Hugh Bailey <obs.jim@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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******************************************************************************/
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#pragma once
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#include "../util/c99defs.h"
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/*
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* A few general math functions that I couldn't really decide where to put.
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*
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* Polar/Cart conversion, torque functions (for smooth movement), percentage,
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* random floats.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct vec2;
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struct vec3;
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EXPORT void polar_to_cart(struct vec3 *dst, const struct vec3 *v);
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EXPORT void cart_to_polar(struct vec3 *dst, const struct vec3 *v);
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EXPORT void norm_to_polar(struct vec2 *dst, const struct vec3 *norm);
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EXPORT void polar_to_norm(struct vec3 *dst, const struct vec2 *polar);
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EXPORT float calc_torquef(float val1, float val2, float torque,
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float min_adjust, float t);
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EXPORT void calc_torque(struct vec3 *dst, const struct vec3 *v1,
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const struct vec3 *v2, float torque, float min_adjust,
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float t);
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static inline float get_percentage(float start, float end, float mid)
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{
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return (mid - start) / (end - start);
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}
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static inline float get_percentagei(int start, int end, int mid)
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{
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return (float)(mid - start) / (float)(end - start);
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}
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EXPORT float rand_float(int positive_only);
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#ifdef __cplusplus
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}
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#endif
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