trect.c - ltk - Socket-based GUI for X11 (WIP)
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       ---
       trect.c (1660B)
       ---
            1 /*
            2  * Copyright (c) 2021, 2022 lumidify <nobody@lumidify.org>
            3  *
            4  * Permission to use, copy, modify, and/or distribute this software for any
            5  * purpose with or without fee is hereby granted, provided that the above
            6  * copyright notice and this permission notice appear in all copies.
            7  *
            8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
            9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
           10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
           11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
           12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
           13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
           14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
           15  */
           16 
           17 #include "rect.h"
           18 
           19 /* FIXME */
           20 #undef MAX
           21 #undef MIN
           22 #define MAX(a, b) ((a) > (b) ? (a) : (b))
           23 #define MIN(a, b) ((a) < (b) ? (a) : (b))
           24 
           25 ltk_rect
           26 ltk_rect_intersect(ltk_rect r1, ltk_rect r2) {
           27         ltk_rect i;
           28         i.x = MAX(r1.x, r2.x);
           29         i.y = MAX(r1.y, r2.y);
           30         i.w = MIN(r1.x + r1.w, r2.x + r2.w) - i.x;
           31         i.h = MIN(r1.y + r1.h, r2.y + r2.h) - i.y;
           32         return i;
           33 }
           34 
           35 ltk_rect
           36 ltk_rect_relative(ltk_rect parent, ltk_rect child) {
           37         return (ltk_rect){child.x - parent.x, child.y - parent.y, child.w, child.h};
           38 }
           39 
           40 ltk_rect
           41 ltk_rect_union(ltk_rect r1, ltk_rect r2) {
           42         ltk_rect u;
           43         u.x = MIN(r1.x, r2.x);
           44         u.y = MIN(r1.y, r2.y);
           45         u.w = MAX(r1.x + r1.w, r2.x + r2.w) - u.x;
           46         u.h = MAX(r1.y + r1.h, r2.y + r2.h) - u.y;
           47         return u;
           48 }
           49 
           50 int
           51 ltk_collide_rect(ltk_rect rect, int x, int y) {
           52         return (rect.x <= x && (rect.x + rect.w) >= x && rect.y <= y
           53                 && (rect.y + rect.h) >= y);
           54 }