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/* 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);
}
/* --------------------------------------------------------------------------------------------- */
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