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/* $Id: coord.c,v 1.1.1.1 2010/07/17 17:30:32 culot Exp $ */
/* vim: et ai sts=2 ts=2 sw=2:
* */
/*
* Copyright (c) 2010 Frederic Culot <frederic@culot.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the
* following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "oldrunner.h"
void
coord_copy (const struct coord *orig, struct coord *dest)
{
dest->y = orig->y;
dest->x = orig->x;
}
void
coord_below (const struct coord *orig, struct coord *dest)
{
dest->y = orig->y + 1;
dest->x = orig->x;
}
void
coord_above (const struct coord *orig, struct coord *dest)
{
dest->y = orig->y - 1;
dest->x = orig->x;
}
enum move
coord_opposite_dir (enum move dir)
{
switch (dir)
{
case MOV_RIGHT:
return MOV_LEFT;
case MOV_LEFT:
return MOV_RIGHT;
case MOV_UP:
return MOV_DOWN;
case MOV_DOWN:
return MOV_UP;
default:
return MOV_NONE;
}
}
void
coord_compute (const struct coord *orig, enum move move, struct coord *dest)
{
coord_copy (orig, dest);
switch (move)
{
case MOV_UP:
dest->y--;
break;
case MOV_DOWN:
case MOV_FALL:
dest->y++;
break;
case MOV_LEFT:
dest->x--;
break;
case MOV_RIGHT:
dest->x++;
break;
default:
dest->y = dest->x = 0;
/* NOTREACHED */
}
}
void
coord_set_yx (struct coord *coord, int y, int x)
{
coord->y = y;
coord->x = x;
}
unsigned
coord_equal (const struct coord *p1, const struct coord *p2)
{
return p1->x == p2->x && p1->y == p2->y ? 1 : 0;
}
void
coord_diff (const struct coord *p1, const struct coord *p2, struct coord *diff)
{
diff->y = p1->y - p2->y;
diff->x = p1->x - p2->x;
}
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