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Diffstat (limited to '')
-rw-r--r-- | lib/widget/rect.c | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/lib/widget/rect.c b/lib/widget/rect.c new file mode 100644 index 0000000..34ae8b0 --- /dev/null +++ b/lib/widget/rect.c @@ -0,0 +1,253 @@ +/* Rectangular class for Midnight Commander widgets + + Copyright (C) 2020-2023 + The Free Software Foundation, Inc. + + Written by: + Andrew Borodin <aborodin@vmail.ru>, 2020-2022 + + This file is part of the Midnight Commander. + + The Midnight Commander is free software: you can redistribute it + and/or modify it under the terms of the GNU General Public License as + published by the Free Software Foundation, either version 3 of the License, + or (at your option) any later version. + + The Midnight Commander is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +/** \file widget-common.c + * \brief Source: shared stuff of widgets + */ + +#include <config.h> + +#include <stdlib.h> + +#include "lib/global.h" + +#include "rect.h" + +/*** global variables ****************************************************************************/ + +/*** file scope macro definitions ****************************************************************/ + +/*** file scope type declarations ****************************************************************/ + +/*** file scope variables ************************************************************************/ + +/*** file scope functions ************************************************************************/ + +/* --------------------------------------------------------------------------------------------- */ +/*** public functions ****************************************************************************/ +/* --------------------------------------------------------------------------------------------- */ +/** + * Create new WRect object. + * + * @param y y-coordinate of left-up corner + * @param x x-coordinate of left-up corner + * @param lines height + * @param cols width + * + * @return newly allocated WRect object. + */ + +WRect * +rect_new (int y, int x, int lines, int cols) +{ + WRect *r; + + r = g_try_new (WRect, 1); + + if (r != NULL) + rect_init (r, y, x, lines, cols); + + return r; +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Initialize WRect object. + * + * @param r WRect object + * @param y y-coordinate of left-up corner + * @param x x-coordinate of left-up corner + * @param lines height + * @param cols width + */ + +void +rect_init (WRect * r, int y, int x, int lines, int cols) +{ + r->y = y; + r->x = x; + r->lines = lines; + r->cols = cols; +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Change position of rectangle area. + * + * @param r WRect object + * @param dy y-shift of left-up corner + * @param dx x-shift of left-up corner + */ + +void +rect_move (WRect * r, int dy, int dx) +{ + r->y += dy; + r->x += dx; +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Change size of rectangle area keeping it's position. + * + * @param r WRect object + * @param dl change size value of height + * @param dc change size value of width + */ + +void +rect_resize (WRect * r, int dl, int dc) +{ + r->lines += dl; + r->cols += dc; +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Change size of rectangle area keeping it's center. + * + * @param r WRect object + * @param dl change size value of y-coordinate and height + * Positive value means move up and increase height. + * Negative value means move down and decrease height. + * @param dc change size value of x-coordinate and width + * Positive value means move left and increase width. + * Negative value means move right and decrease width. + */ + +void +rect_grow (WRect * r, int dl, int dc) +{ + r->y -= dl; + r->x -= dc; + r->lines += dl * 2; + r->cols += dc * 2; +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Calculates the intersection of two rectangle areas. + * The resulting rectangle is the largest rectangle which contains intersection of rectangle areas. + * + * @param r first WRect object + * @param r1 second WRect object + * + * The resulting rectangle is stored in r. + */ + +void +rect_intersect (WRect * r, const WRect * r1) +{ + int y, x; + int y1, x1; + + /* right-down corners */ + y = r->y + r->lines; + x = r->x + r->cols; + y1 = r1->y + r1->lines; + x1 = r1->x + r1->cols; + + /* right-down corner of intersection */ + y = MIN (y, y1); + x = MIN (x, x1); + + /* left-up corner of intersection */ + r->y = MAX (r->y, r1->y); + r->x = MAX (r->x, r1->x); + + /* intersection sizes */ + r->lines = y - r->y; + r->cols = x - r->x; +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Calculates the union of two rectangle areas. + * The resulting rectangle is the largest rectangle which contains both rectangle areas. + * + * @param r first WRect object + * @param r1 second WRect object + * + * The resulting rectangle is stored in r. + */ + +void +rect_union (WRect * r, const WRect * r1) +{ + int x, y; + int x1, y1; + + /* right-down corners */ + y = r->y + r->lines; + x = r->x + r->cols; + y1 = r1->y + r1->lines; + x1 = r1->x + r1->cols; + + /* right-down corner of union */ + y = MAX (y, y1); + x = MAX (x, x1); + + /* left-up corner of union */ + r->y = MIN (r->y, r1->y); + r->x = MIN (r->x, r1->x); + + /* union sizes */ + r->lines = y - r->y; + r->cols = x - r->x; +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Check whether two rectangle areas are overlapped or not. + * + * @param r1 WRect object + * @param r2 WRect object + * + * @return TRUE if rectangle areas are overlapped, FALSE otherwise. + */ + +gboolean +rects_are_overlapped (const WRect * r1, const WRect * r2) +{ + return !((r2->x >= r1->x + r1->cols) || (r1->x >= r2->x + r2->cols) + || (r2->y >= r1->y + r1->lines) || (r1->y >= r2->y + r2->lines)); +} + +/* --------------------------------------------------------------------------------------------- */ +/** + * Check whether two rectangle areas are equal or not. + * + * @param r1 WRect object + * @param r2 WRect object + * + * @return TRUE if rectangle areas are equal, FALSE otherwise. + */ + +gboolean +rects_are_equal (const WRect * r1, const WRect * r2) +{ + return (r1->y == r2->y && r1->x == r2->x && r1->lines == r2->lines && r1->cols == r2->cols); +} + +/* --------------------------------------------------------------------------------------------- */ |