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+/* Rectangular class for Midnight Commander widgets
+
+ Copyright (C) 2020-2022
+ 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 heigth
+ * @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 heigth
+ * @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 heigth
+ * @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 heigth
+ * Positive value means move up and increase heigth.
+ * Negative value means move down and decrease heigth.
+ * @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);
+}
+
+/* --------------------------------------------------------------------------------------------- */
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