forked from enlightenment/efl
174 lines
5.2 KiB
C
174 lines
5.2 KiB
C
/* EINA - EFL data type library
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* Copyright (C) 2015 Subhransu Mohanty
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library;
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* if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef EINA_BEZIER_H
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#define EINA_BEZIER_H
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/**
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* Floating point cubic bezier curve
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*/
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typedef struct _Eina_Bezier Eina_Bezier;
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struct _Eina_Bezier
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{
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struct {
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double x; /**< x coordinate of start point */
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double y; /**< y coordinate of start point */
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} start;
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struct {
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double x; /**< x coordinate of 1st control point */
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double y; /**< y coordinate of 1st control point */
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} ctrl_start;
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struct {
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double x; /**< coordinate of 2nd control point */
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double y; /**< y coordinate of 2nd control point */
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} ctrl_end;
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struct {
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double x; /**< x coordinate of end point */
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double y; /**< y coordinate of end point */
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} end;
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};
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/**
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* @brief Set the values of the points of the given floating
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* point cubic bezier curve.
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*
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* @param b The floating point bezier.
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* @param start_x x coordinate of start point.
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* @param start_y y coordinate of start point.
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* @param ctrl_start_x x coordinate of 1st control point.
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* @param ctrl_start_y y coordinate of 1st control point.
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* @param ctrl_end_x x coordinate of 2nd control point.
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* @param ctrl_end_y y coordinate of 2nd control point.
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* @param end_x x coordinate of end point.
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* @param end_y y coordinate of end point.
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*
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* @p b. No check is done on @p b.
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* @since 1.16
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*/
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EAPI void eina_bezier_values_set(Eina_Bezier *b, double start_x, double start_y, double ctrl_start_x, double ctrl_start_y, double ctrl_end_x, double ctrl_end_y, double end_x, double end_y) EINA_ARG_NONNULL(1);
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/**
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* @brief Get the values of the points of the given floating
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* point cubic bezier curve.
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*
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* @param b The floating point bezier.
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* @param start_x x coordinate of start point.
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* @param start_y y coordinate of start point.
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* @param ctrl_start_x x coordinate of 1st control point.
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* @param ctrl_start_y y coordinate of 1st control point.
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* @param ctrl_end_x x coordinate of 2nd control point.
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* @param ctrl_end_y y coordinate of 2nd control point.
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* @param end_x x coordinate of end point.
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* @param end_y y coordinate of end point.
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*
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* @p b. No check is done on @p b.
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* @since 1.16
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*/
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EAPI void eina_bezier_values_get(const Eina_Bezier *b, double *start_x, double *start_y, double *ctrl_start_x, double *ctrl_start_y, double *ctrl_end_x, double *ctrl_end_y, double *end_x, double *end_y) EINA_ARG_NONNULL(1);
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/**
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* @brief Returns the length of the given floating
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* point cubic bezier curve.
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*
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* @param b The floating point bezier.
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*
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* @p b. No check is done on @p b.
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* @since 1.16
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*/
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EAPI double eina_bezier_length_get(const Eina_Bezier *b) EINA_ARG_NONNULL(1);
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/**
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* @brief Returns the position of the given bezier
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* at given length.
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*
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* @param b The floating point bezier.
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* @param len The given length.
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*
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* @p b. No check is done on @p b.
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* @since 1.16
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*/
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EAPI double eina_bezier_t_at(const Eina_Bezier *b, double len) EINA_ARG_NONNULL(1);
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/**
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* @brief Gets the point on the bezier curve at
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* position t.
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*
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* @param b The floating point bezier.
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* @param t The floating point position.
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*
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* @p b. No check is done on @p b.
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* @since 1.16
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*/
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EAPI void eina_bezier_point_at(const Eina_Bezier *b, double t, double *px, double *py) EINA_ARG_NONNULL(1);
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/**
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* @brief Returns the slope of the bezier
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* at given length.
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*
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* @param b The floating point bezier.
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* @param len The given length.
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*
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* @p b. No check is done on @p b.
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* @since 1.16
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*/
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EAPI double eina_bezier_angle_at(const Eina_Bezier *b, double t) EINA_ARG_NONNULL(1);
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/**
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* @brief split the bezier at given length.
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*
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* @param b The floating point bezier.
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* @param len The given length.
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*
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* @p b. No check is done on @p b.
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* @since 1.16
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*/
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EAPI void eina_bezier_split_at_length(const Eina_Bezier *b, double len, Eina_Bezier *left, Eina_Bezier *right) EINA_ARG_NONNULL(1);
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/**
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* @brief get the bound of the the bezier.
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*
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* @param b The floating point bezier.
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* @param x x coordinate of bounding box.
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* @param y y coordinate of bounding box.
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* @param w width of bounding box.
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* @param h height of bounding box.
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*
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* @p b. No check is done on @p b.
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* @since 1.17
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*/
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EAPI void eina_bezier_bounds_get(const Eina_Bezier *b, double *x, double *y, double *w, double *h) EINA_ARG_NONNULL(1);
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/**
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* @brief find the bezier at given interval.
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*
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* @param b The floating point bezier.
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* @param t0 The start interval.
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* @param t1 The end interval.
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* @param result The result bezier.
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*
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* @p b. No check is done on @p b.
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* @since 1.17
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*/
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EAPI void eina_bezier_on_interval(Eina_Bezier *b, double t0, double t1, Eina_Bezier *result);
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#endif // EINA_BEZIER_H
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