File: graphene-point.h

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/* graphene-point.h: Point and Size
 *
 * Copyright 2014  Emmanuele Bassi
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#ifndef __GRAPHENE_POINT_H__
#define __GRAPHENE_POINT_H__

#if !defined(GRAPHENE_H_INSIDE) && !defined(GRAPHENE_COMPILATION)
#error "Only graphene.h can be included directly."
#endif

#include "graphene-types.h"

GRAPHENE_BEGIN_DECLS

/**
 * GRAPHENE_POINT_INIT:
 * @_x: the X coordinate
 * @_y: the Y coordinate
 *
 * Initializes a #graphene_point_t with the given coordinates
 * when declaring it, e.g:
 *
 * |[<!-- language="C" -->
 *   graphene_point_t p = GRAPHENE_POINT_INIT (10.f, 10.f);
 * ]|
 *
 * Since: 1.0
 */
#define GRAPHENE_POINT_INIT(_x,_y)      (graphene_point_t) { .x = (_x), .y = (_y) }

/**
 * GRAPHENE_POINT_INIT_ZERO:
 *
 * Initializes a #graphene_point_t to (0, 0) when declaring it.
 *
 * Since: 1.0
 */
#define GRAPHENE_POINT_INIT_ZERO        GRAPHENE_POINT_INIT (0.f, 0.f)

/**
 * graphene_point_t:
 * @x: the X coordinate of the point
 * @y: the Y coordinate of the point
 *
 * A point with two coordinates.
 *
 * Since: 1.0
 */
struct _graphene_point_t
{
  float x;
  float y;
};

GRAPHENE_AVAILABLE_IN_1_0
graphene_point_t *              graphene_point_alloc            (void);
GRAPHENE_AVAILABLE_IN_1_0
void                            graphene_point_free             (graphene_point_t       *p);

GRAPHENE_AVAILABLE_IN_1_0
graphene_point_t *              graphene_point_init             (graphene_point_t       *p,
                                                                 float                   x,
                                                                 float                   y);
GRAPHENE_AVAILABLE_IN_1_0
graphene_point_t *              graphene_point_init_from_point  (graphene_point_t       *p,
                                                                 const graphene_point_t *src);
GRAPHENE_AVAILABLE_IN_1_4
graphene_point_t *              graphene_point_init_from_vec2   (graphene_point_t       *p,
                                                                 const graphene_vec2_t  *src);
GRAPHENE_AVAILABLE_IN_1_0
bool                            graphene_point_equal            (const graphene_point_t *a,
                                                                 const graphene_point_t *b);

GRAPHENE_AVAILABLE_IN_1_0
float                           graphene_point_distance         (const graphene_point_t *a,
                                                                 const graphene_point_t *b,
                                                                 float                  *d_x,
                                                                 float                  *d_y);

GRAPHENE_AVAILABLE_IN_1_0
bool                            graphene_point_near             (const graphene_point_t *a,
                                                                 const graphene_point_t *b,
                                                                 float                   epsilon);

GRAPHENE_AVAILABLE_IN_1_0
void                            graphene_point_interpolate      (const graphene_point_t *a,
                                                                 const graphene_point_t *b,
                                                                 double                  factor,
                                                                 graphene_point_t       *res);

GRAPHENE_AVAILABLE_IN_1_4
void                            graphene_point_to_vec2          (const graphene_point_t *p,
                                                                 graphene_vec2_t        *v);

GRAPHENE_AVAILABLE_IN_1_0
const graphene_point_t *        graphene_point_zero             (void);

GRAPHENE_END_DECLS

#endif /* __GRAPHENE_POINT_H__ */