1/*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
4
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
8
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
12
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
20*/
21
22/**
23 * \file SDL_rect.h
24 *
25 * Header file for SDL_rect definition and management functions.
26 */
27
28#ifndef SDL_rect_h_
29#define SDL_rect_h_
30
31#include "SDL_stdinc.h"
32#include "SDL_error.h"
33#include "SDL_pixels.h"
34#include "SDL_rwops.h"
35
36#include "begin_code.h"
37/* Set up for C function definitions, even when using C++ */
38#ifdef __cplusplus
39extern "C" {
40#endif
41
42/**
43 * The structure that defines a point (integer)
44 *
45 * \sa SDL_EnclosePoints
46 * \sa SDL_PointInRect
47 */
48typedef struct SDL_Point
49{
50 int x;
51 int y;
52} SDL_Point;
53
54/**
55 * The structure that defines a point (floating point)
56 *
57 * \sa SDL_EnclosePoints
58 * \sa SDL_PointInRect
59 */
60typedef struct SDL_FPoint
61{
62 float x;
63 float y;
64} SDL_FPoint;
65
66
67/**
68 * A rectangle, with the origin at the upper left (integer).
69 *
70 * \sa SDL_RectEmpty
71 * \sa SDL_RectEquals
72 * \sa SDL_HasIntersection
73 * \sa SDL_IntersectRect
74 * \sa SDL_UnionRect
75 * \sa SDL_EnclosePoints
76 */
77typedef struct SDL_Rect
78{
79 int x, y;
80 int w, h;
81} SDL_Rect;
82
83
84/**
85 * A rectangle, with the origin at the upper left (floating point).
86 */
87typedef struct SDL_FRect
88{
89 float x;
90 float y;
91 float w;
92 float h;
93} SDL_FRect;
94
95
96/**
97 * Returns true if point resides inside a rectangle.
98 */
99SDL_FORCE_INLINE SDL_bool SDL_PointInRect(const SDL_Point *p, const SDL_Rect *r)
100{
101 return ( (p->x >= r->x) && (p->x < (r->x + r->w)) &&
102 (p->y >= r->y) && (p->y < (r->y + r->h)) ) ? SDL_TRUE : SDL_FALSE;
103}
104
105/**
106 * Returns true if the rectangle has no area.
107 */
108SDL_FORCE_INLINE SDL_bool SDL_RectEmpty(const SDL_Rect *r)
109{
110 return ((!r) || (r->w <= 0) || (r->h <= 0)) ? SDL_TRUE : SDL_FALSE;
111}
112
113/**
114 * Returns true if the two rectangles are equal.
115 */
116SDL_FORCE_INLINE SDL_bool SDL_RectEquals(const SDL_Rect *a, const SDL_Rect *b)
117{
118 return (a && b && (a->x == b->x) && (a->y == b->y) &&
119 (a->w == b->w) && (a->h == b->h)) ? SDL_TRUE : SDL_FALSE;
120}
121
122/**
123 * Determine whether two rectangles intersect.
124 *
125 * If either pointer is NULL the function will return SDL_FALSE.
126 *
127 * \param A an SDL_Rect structure representing the first rectangle
128 * \param B an SDL_Rect structure representing the second rectangle
129 * \returns SDL_TRUE if there is an intersection, SDL_FALSE otherwise.
130 *
131 * \since This function is available since SDL 2.0.0.
132 *
133 * \sa SDL_IntersectRect
134 */
135extern DECLSPEC SDL_bool SDLCALL SDL_HasIntersection(const SDL_Rect * A,
136 const SDL_Rect * B);
137
138/**
139 * Calculate the intersection of two rectangles.
140 *
141 * If `result` is NULL then this function will return SDL_FALSE.
142 *
143 * \param A an SDL_Rect structure representing the first rectangle
144 * \param B an SDL_Rect structure representing the second rectangle
145 * \param result an SDL_Rect structure filled in with the intersection of
146 * rectangles `A` and `B`
147 * \returns SDL_TRUE if there is an intersection, SDL_FALSE otherwise.
148 *
149 * \since This function is available since SDL 2.0.0.
150 *
151 * \sa SDL_HasIntersection
152 */
153extern DECLSPEC SDL_bool SDLCALL SDL_IntersectRect(const SDL_Rect * A,
154 const SDL_Rect * B,
155 SDL_Rect * result);
156
157/**
158 * Calculate the union of two rectangles.
159 *
160 * \param A an SDL_Rect structure representing the first rectangle
161 * \param B an SDL_Rect structure representing the second rectangle
162 * \param result an SDL_Rect structure filled in with the union of rectangles
163 * `A` and `B`
164 *
165 * \since This function is available since SDL 2.0.0.
166 */
167extern DECLSPEC void SDLCALL SDL_UnionRect(const SDL_Rect * A,
168 const SDL_Rect * B,
169 SDL_Rect * result);
170
171/**
172 * Calculate a minimal rectangle enclosing a set of points.
173 *
174 * If `clip` is not NULL then only points inside of the clipping rectangle are
175 * considered.
176 *
177 * \param points an array of SDL_Point structures representing points to be
178 * enclosed
179 * \param count the number of structures in the `points` array
180 * \param clip an SDL_Rect used for clipping or NULL to enclose all points
181 * \param result an SDL_Rect structure filled in with the minimal enclosing
182 * rectangle
183 * \returns SDL_TRUE if any points were enclosed or SDL_FALSE if all the
184 * points were outside of the clipping rectangle.
185 *
186 * \since This function is available since SDL 2.0.0.
187 */
188extern DECLSPEC SDL_bool SDLCALL SDL_EnclosePoints(const SDL_Point * points,
189 int count,
190 const SDL_Rect * clip,
191 SDL_Rect * result);
192
193/**
194 * Calculate the intersection of a rectangle and line segment.
195 *
196 * This function is used to clip a line segment to a rectangle. A line segment
197 * contained entirely within the rectangle or that does not intersect will
198 * remain unchanged. A line segment that crosses the rectangle at either or
199 * both ends will be clipped to the boundary of the rectangle and the new
200 * coordinates saved in `X1`, `Y1`, `X2`, and/or `Y2` as necessary.
201 *
202 * \param rect an SDL_Rect structure representing the rectangle to intersect
203 * \param X1 a pointer to the starting X-coordinate of the line
204 * \param Y1 a pointer to the starting Y-coordinate of the line
205 * \param X2 a pointer to the ending X-coordinate of the line
206 * \param Y2 a pointer to the ending Y-coordinate of the line
207 * \returns SDL_TRUE if there is an intersection, SDL_FALSE otherwise.
208 *
209 * \since This function is available since SDL 2.0.0.
210 */
211extern DECLSPEC SDL_bool SDLCALL SDL_IntersectRectAndLine(const SDL_Rect *
212 rect, int *X1,
213 int *Y1, int *X2,
214 int *Y2);
215
216/* Ends C function definitions when using C++ */
217#ifdef __cplusplus
218}
219#endif
220#include "close_code.h"
221
222#endif /* SDL_rect_h_ */
223
224/* vi: set ts=4 sw=4 expandtab: */
225

source code of include/SDL2/SDL_rect.h